1/*
   2 * Copyright (c) 2015, The Linux Foundation. All rights reserved.
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 and
   6 * only version 2 as published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 */
  13
  14#include <linux/clk.h>
  15#include <linux/delay.h>
  16#include <linux/err.h>
  17#include <linux/gpio.h>
  18#include <linux/gpio/consumer.h>
  19#include <linux/interrupt.h>
  20#include <linux/of_device.h>
  21#include <linux/of_gpio.h>
  22#include <linux/of_irq.h>
  23#include <linux/pinctrl/consumer.h>
  24#include <linux/of_graph.h>
  25#include <linux/regulator/consumer.h>
  26#include <linux/spinlock.h>
  27#include <linux/mfd/syscon.h>
  28#include <linux/regmap.h>
  29#include <video/mipi_display.h>
  30
  31#include "dsi.h"
  32#include "dsi.xml.h"
  33#include "sfpb.xml.h"
  34#include "dsi_cfg.h"
 
  35
  36static int dsi_get_version(const void __iomem *base, u32 *major, u32 *minor)
  37{
  38	u32 ver;
  39
  40	if (!major || !minor)
  41		return -EINVAL;
  42
  43	/*
  44	 * From DSI6G(v3), addition of a 6G_HW_VERSION register at offset 0
  45	 * makes all other registers 4-byte shifted down.
  46	 *
  47	 * In order to identify between DSI6G(v3) and beyond, and DSIv2 and
  48	 * older, we read the DSI_VERSION register without any shift(offset
  49	 * 0x1f0). In the case of DSIv2, this hast to be a non-zero value. In
  50	 * the case of DSI6G, this has to be zero (the offset points to a
  51	 * scratch register which we never touch)
  52	 */
  53
  54	ver = msm_readl(base + REG_DSI_VERSION);
  55	if (ver) {
  56		/* older dsi host, there is no register shift */
  57		ver = FIELD(ver, DSI_VERSION_MAJOR);
  58		if (ver <= MSM_DSI_VER_MAJOR_V2) {
  59			/* old versions */
  60			*major = ver;
  61			*minor = 0;
  62			return 0;
  63		} else {
  64			return -EINVAL;
  65		}
  66	} else {
  67		/*
  68		 * newer host, offset 0 has 6G_HW_VERSION, the rest of the
  69		 * registers are shifted down, read DSI_VERSION again with
  70		 * the shifted offset
  71		 */
  72		ver = msm_readl(base + DSI_6G_REG_SHIFT + REG_DSI_VERSION);
  73		ver = FIELD(ver, DSI_VERSION_MAJOR);
  74		if (ver == MSM_DSI_VER_MAJOR_6G) {
  75			/* 6G version */
  76			*major = ver;
  77			*minor = msm_readl(base + REG_DSI_6G_HW_VERSION);
  78			return 0;
  79		} else {
  80			return -EINVAL;
  81		}
  82	}
  83}
  84
  85#define DSI_ERR_STATE_ACK			0x0000
  86#define DSI_ERR_STATE_TIMEOUT			0x0001
  87#define DSI_ERR_STATE_DLN0_PHY			0x0002
  88#define DSI_ERR_STATE_FIFO			0x0004
  89#define DSI_ERR_STATE_MDP_FIFO_UNDERFLOW	0x0008
  90#define DSI_ERR_STATE_INTERLEAVE_OP_CONTENTION	0x0010
  91#define DSI_ERR_STATE_PLL_UNLOCKED		0x0020
  92
  93#define DSI_CLK_CTRL_ENABLE_CLKS	\
  94		(DSI_CLK_CTRL_AHBS_HCLK_ON | DSI_CLK_CTRL_AHBM_SCLK_ON | \
  95		DSI_CLK_CTRL_PCLK_ON | DSI_CLK_CTRL_DSICLK_ON | \
  96		DSI_CLK_CTRL_BYTECLK_ON | DSI_CLK_CTRL_ESCCLK_ON | \
  97		DSI_CLK_CTRL_FORCE_ON_DYN_AHBM_HCLK)
  98
  99struct msm_dsi_host {
 100	struct mipi_dsi_host base;
 101
 102	struct platform_device *pdev;
 103	struct drm_device *dev;
 104
 105	int id;
 106
 107	void __iomem *ctrl_base;
 108	struct regulator_bulk_data supplies[DSI_DEV_REGULATOR_MAX];
 109
 110	struct clk *bus_clks[DSI_BUS_CLK_MAX];
 111
 112	struct clk *byte_clk;
 113	struct clk *esc_clk;
 114	struct clk *pixel_clk;
 115	struct clk *byte_clk_src;
 116	struct clk *pixel_clk_src;
 
 117
 118	u32 byte_clk_rate;
 119	u32 esc_clk_rate;
 120
 121	/* DSI v2 specific clocks */
 122	struct clk *src_clk;
 123	struct clk *esc_clk_src;
 124	struct clk *dsi_clk_src;
 125
 126	u32 src_clk_rate;
 127
 128	struct gpio_desc *disp_en_gpio;
 129	struct gpio_desc *te_gpio;
 130
 131	const struct msm_dsi_cfg_handler *cfg_hnd;
 132
 133	struct completion dma_comp;
 134	struct completion video_comp;
 135	struct mutex dev_mutex;
 136	struct mutex cmd_mutex;
 137	struct mutex clk_mutex;
 138	spinlock_t intr_lock; /* Protect interrupt ctrl register */
 139
 140	u32 err_work_state;
 141	struct work_struct err_work;
 
 142	struct workqueue_struct *workqueue;
 143
 144	/* DSI 6G TX buffer*/
 145	struct drm_gem_object *tx_gem_obj;
 146
 147	/* DSI v2 TX buffer */
 148	void *tx_buf;
 149	dma_addr_t tx_buf_paddr;
 150
 151	int tx_size;
 152
 153	u8 *rx_buf;
 154
 155	struct regmap *sfpb;
 156
 157	struct drm_display_mode *mode;
 158
 159	/* connected device info */
 160	struct device_node *device_node;
 161	unsigned int channel;
 162	unsigned int lanes;
 163	enum mipi_dsi_pixel_format format;
 164	unsigned long mode_flags;
 165
 166	/* lane data parsed via DT */
 167	int dlane_swap;
 168	int num_data_lanes;
 169
 170	u32 dma_cmd_ctrl_restore;
 171
 172	bool registered;
 173	bool power_on;
 
 174	int irq;
 175};
 176
 177static u32 dsi_get_bpp(const enum mipi_dsi_pixel_format fmt)
 178{
 179	switch (fmt) {
 180	case MIPI_DSI_FMT_RGB565:		return 16;
 181	case MIPI_DSI_FMT_RGB666_PACKED:	return 18;
 182	case MIPI_DSI_FMT_RGB666:
 183	case MIPI_DSI_FMT_RGB888:
 184	default:				return 24;
 185	}
 186}
 187
 188static inline u32 dsi_read(struct msm_dsi_host *msm_host, u32 reg)
 189{
 190	return msm_readl(msm_host->ctrl_base + reg);
 191}
 192static inline void dsi_write(struct msm_dsi_host *msm_host, u32 reg, u32 data)
 193{
 194	msm_writel(data, msm_host->ctrl_base + reg);
 195}
 196
 197static int dsi_host_regulator_enable(struct msm_dsi_host *msm_host);
 198static void dsi_host_regulator_disable(struct msm_dsi_host *msm_host);
 199
 200static const struct msm_dsi_cfg_handler *dsi_get_config(
 201						struct msm_dsi_host *msm_host)
 202{
 203	const struct msm_dsi_cfg_handler *cfg_hnd = NULL;
 204	struct device *dev = &msm_host->pdev->dev;
 205	struct regulator *gdsc_reg;
 206	struct clk *ahb_clk;
 207	int ret;
 208	u32 major = 0, minor = 0;
 209
 210	gdsc_reg = regulator_get(dev, "gdsc");
 211	if (IS_ERR(gdsc_reg)) {
 212		pr_err("%s: cannot get gdsc\n", __func__);
 213		goto exit;
 214	}
 215
 216	ahb_clk = clk_get(dev, "iface_clk");
 217	if (IS_ERR(ahb_clk)) {
 218		pr_err("%s: cannot get interface clock\n", __func__);
 219		goto put_gdsc;
 220	}
 221
 
 
 222	ret = regulator_enable(gdsc_reg);
 223	if (ret) {
 224		pr_err("%s: unable to enable gdsc\n", __func__);
 225		goto put_clk;
 226	}
 227
 228	ret = clk_prepare_enable(ahb_clk);
 229	if (ret) {
 230		pr_err("%s: unable to enable ahb_clk\n", __func__);
 231		goto disable_gdsc;
 232	}
 233
 234	ret = dsi_get_version(msm_host->ctrl_base, &major, &minor);
 235	if (ret) {
 236		pr_err("%s: Invalid version\n", __func__);
 237		goto disable_clks;
 238	}
 239
 240	cfg_hnd = msm_dsi_cfg_get(major, minor);
 241
 242	DBG("%s: Version %x:%x\n", __func__, major, minor);
 243
 244disable_clks:
 245	clk_disable_unprepare(ahb_clk);
 246disable_gdsc:
 247	regulator_disable(gdsc_reg);
 248put_clk:
 249	clk_put(ahb_clk);
 250put_gdsc:
 251	regulator_put(gdsc_reg);
 252exit:
 253	return cfg_hnd;
 254}
 255
 256static inline struct msm_dsi_host *to_msm_dsi_host(struct mipi_dsi_host *host)
 257{
 258	return container_of(host, struct msm_dsi_host, base);
 259}
 260
 261static void dsi_host_regulator_disable(struct msm_dsi_host *msm_host)
 262{
 263	struct regulator_bulk_data *s = msm_host->supplies;
 264	const struct dsi_reg_entry *regs = msm_host->cfg_hnd->cfg->reg_cfg.regs;
 265	int num = msm_host->cfg_hnd->cfg->reg_cfg.num;
 266	int i;
 267
 268	DBG("");
 269	for (i = num - 1; i >= 0; i--)
 270		if (regs[i].disable_load >= 0)
 271			regulator_set_load(s[i].consumer,
 272					   regs[i].disable_load);
 273
 274	regulator_bulk_disable(num, s);
 275}
 276
 277static int dsi_host_regulator_enable(struct msm_dsi_host *msm_host)
 278{
 279	struct regulator_bulk_data *s = msm_host->supplies;
 280	const struct dsi_reg_entry *regs = msm_host->cfg_hnd->cfg->reg_cfg.regs;
 281	int num = msm_host->cfg_hnd->cfg->reg_cfg.num;
 282	int ret, i;
 283
 284	DBG("");
 285	for (i = 0; i < num; i++) {
 286		if (regs[i].enable_load >= 0) {
 287			ret = regulator_set_load(s[i].consumer,
 288						 regs[i].enable_load);
 289			if (ret < 0) {
 290				pr_err("regulator %d set op mode failed, %d\n",
 291					i, ret);
 292				goto fail;
 293			}
 294		}
 295	}
 296
 297	ret = regulator_bulk_enable(num, s);
 298	if (ret < 0) {
 299		pr_err("regulator enable failed, %d\n", ret);
 300		goto fail;
 301	}
 302
 303	return 0;
 304
 305fail:
 306	for (i--; i >= 0; i--)
 307		regulator_set_load(s[i].consumer, regs[i].disable_load);
 308	return ret;
 309}
 310
 311static int dsi_regulator_init(struct msm_dsi_host *msm_host)
 312{
 313	struct regulator_bulk_data *s = msm_host->supplies;
 314	const struct dsi_reg_entry *regs = msm_host->cfg_hnd->cfg->reg_cfg.regs;
 315	int num = msm_host->cfg_hnd->cfg->reg_cfg.num;
 316	int i, ret;
 317
 318	for (i = 0; i < num; i++)
 319		s[i].supply = regs[i].name;
 320
 321	ret = devm_regulator_bulk_get(&msm_host->pdev->dev, num, s);
 322	if (ret < 0) {
 323		pr_err("%s: failed to init regulator, ret=%d\n",
 324						__func__, ret);
 325		return ret;
 326	}
 327
 328	for (i = 0; i < num; i++) {
 329		if (regulator_can_change_voltage(s[i].consumer)) {
 330			ret = regulator_set_voltage(s[i].consumer,
 331				regs[i].min_voltage, regs[i].max_voltage);
 332			if (ret < 0) {
 333				pr_err("regulator %d set voltage failed, %d\n",
 334					i, ret);
 335				return ret;
 336			}
 337		}
 338	}
 339
 340	return 0;
 341}
 342
 343static int dsi_clk_init(struct msm_dsi_host *msm_host)
 344{
 345	struct device *dev = &msm_host->pdev->dev;
 346	const struct msm_dsi_cfg_handler *cfg_hnd = msm_host->cfg_hnd;
 347	const struct msm_dsi_config *cfg = cfg_hnd->cfg;
 348	int i, ret = 0;
 349
 350	/* get bus clocks */
 351	for (i = 0; i < cfg->num_bus_clks; i++) {
 352		msm_host->bus_clks[i] = devm_clk_get(dev,
 353						cfg->bus_clk_names[i]);
 354		if (IS_ERR(msm_host->bus_clks[i])) {
 355			ret = PTR_ERR(msm_host->bus_clks[i]);
 356			pr_err("%s: Unable to get %s, ret = %d\n",
 357				__func__, cfg->bus_clk_names[i], ret);
 358			goto exit;
 359		}
 360	}
 361
 362	/* get link and source clocks */
 363	msm_host->byte_clk = devm_clk_get(dev, "byte_clk");
 364	if (IS_ERR(msm_host->byte_clk)) {
 365		ret = PTR_ERR(msm_host->byte_clk);
 366		pr_err("%s: can't find dsi_byte_clk. ret=%d\n",
 367			__func__, ret);
 368		msm_host->byte_clk = NULL;
 369		goto exit;
 370	}
 371
 372	msm_host->pixel_clk = devm_clk_get(dev, "pixel_clk");
 373	if (IS_ERR(msm_host->pixel_clk)) {
 374		ret = PTR_ERR(msm_host->pixel_clk);
 375		pr_err("%s: can't find dsi_pixel_clk. ret=%d\n",
 376			__func__, ret);
 377		msm_host->pixel_clk = NULL;
 378		goto exit;
 379	}
 380
 381	msm_host->esc_clk = devm_clk_get(dev, "core_clk");
 382	if (IS_ERR(msm_host->esc_clk)) {
 383		ret = PTR_ERR(msm_host->esc_clk);
 384		pr_err("%s: can't find dsi_esc_clk. ret=%d\n",
 385			__func__, ret);
 386		msm_host->esc_clk = NULL;
 387		goto exit;
 388	}
 389
 
 
 
 
 
 
 
 
 
 
 
 
 
 390	msm_host->byte_clk_src = clk_get_parent(msm_host->byte_clk);
 391	if (!msm_host->byte_clk_src) {
 392		ret = -ENODEV;
 393		pr_err("%s: can't find byte_clk_src. ret=%d\n", __func__, ret);
 394		goto exit;
 395	}
 396
 397	msm_host->pixel_clk_src = clk_get_parent(msm_host->pixel_clk);
 398	if (!msm_host->pixel_clk_src) {
 399		ret = -ENODEV;
 400		pr_err("%s: can't find pixel_clk_src. ret=%d\n", __func__, ret);
 401		goto exit;
 402	}
 403
 404	if (cfg_hnd->major == MSM_DSI_VER_MAJOR_V2) {
 405		msm_host->src_clk = devm_clk_get(dev, "src_clk");
 406		if (IS_ERR(msm_host->src_clk)) {
 407			ret = PTR_ERR(msm_host->src_clk);
 408			pr_err("%s: can't find dsi_src_clk. ret=%d\n",
 409				__func__, ret);
 410			msm_host->src_clk = NULL;
 411			goto exit;
 412		}
 413
 414		msm_host->esc_clk_src = clk_get_parent(msm_host->esc_clk);
 415		if (!msm_host->esc_clk_src) {
 416			ret = -ENODEV;
 417			pr_err("%s: can't get esc_clk_src. ret=%d\n",
 418				__func__, ret);
 419			goto exit;
 420		}
 421
 422		msm_host->dsi_clk_src = clk_get_parent(msm_host->src_clk);
 423		if (!msm_host->dsi_clk_src) {
 424			ret = -ENODEV;
 425			pr_err("%s: can't get dsi_clk_src. ret=%d\n",
 426				__func__, ret);
 427		}
 428	}
 429exit:
 430	return ret;
 431}
 432
 433static int dsi_bus_clk_enable(struct msm_dsi_host *msm_host)
 434{
 435	const struct msm_dsi_config *cfg = msm_host->cfg_hnd->cfg;
 436	int i, ret;
 437
 438	DBG("id=%d", msm_host->id);
 439
 440	for (i = 0; i < cfg->num_bus_clks; i++) {
 441		ret = clk_prepare_enable(msm_host->bus_clks[i]);
 442		if (ret) {
 443			pr_err("%s: failed to enable bus clock %d ret %d\n",
 444				__func__, i, ret);
 445			goto err;
 446		}
 447	}
 448
 449	return 0;
 450err:
 451	for (; i > 0; i--)
 452		clk_disable_unprepare(msm_host->bus_clks[i]);
 453
 454	return ret;
 455}
 456
 457static void dsi_bus_clk_disable(struct msm_dsi_host *msm_host)
 458{
 459	const struct msm_dsi_config *cfg = msm_host->cfg_hnd->cfg;
 460	int i;
 461
 462	DBG("");
 463
 464	for (i = cfg->num_bus_clks - 1; i >= 0; i--)
 465		clk_disable_unprepare(msm_host->bus_clks[i]);
 466}
 467
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 468static int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
 469{
 470	int ret;
 471
 472	DBG("Set clk rates: pclk=%d, byteclk=%d",
 473		msm_host->mode->clock, msm_host->byte_clk_rate);
 474
 475	ret = clk_set_rate(msm_host->byte_clk, msm_host->byte_clk_rate);
 476	if (ret) {
 477		pr_err("%s: Failed to set rate byte clk, %d\n", __func__, ret);
 478		goto error;
 479	}
 480
 481	ret = clk_set_rate(msm_host->pixel_clk, msm_host->mode->clock * 1000);
 482	if (ret) {
 483		pr_err("%s: Failed to set rate pixel clk, %d\n", __func__, ret);
 484		goto error;
 485	}
 486
 
 
 
 
 
 
 
 
 
 
 487	ret = clk_prepare_enable(msm_host->esc_clk);
 488	if (ret) {
 489		pr_err("%s: Failed to enable dsi esc clk\n", __func__);
 490		goto error;
 491	}
 492
 493	ret = clk_prepare_enable(msm_host->byte_clk);
 494	if (ret) {
 495		pr_err("%s: Failed to enable dsi byte clk\n", __func__);
 496		goto byte_clk_err;
 497	}
 498
 499	ret = clk_prepare_enable(msm_host->pixel_clk);
 500	if (ret) {
 501		pr_err("%s: Failed to enable dsi pixel clk\n", __func__);
 502		goto pixel_clk_err;
 503	}
 504
 
 
 
 
 
 
 
 
 
 505	return 0;
 506
 
 
 507pixel_clk_err:
 508	clk_disable_unprepare(msm_host->byte_clk);
 509byte_clk_err:
 510	clk_disable_unprepare(msm_host->esc_clk);
 511error:
 512	return ret;
 513}
 514
 515static int dsi_link_clk_enable_v2(struct msm_dsi_host *msm_host)
 516{
 517	int ret;
 518
 519	DBG("Set clk rates: pclk=%d, byteclk=%d, esc_clk=%d, dsi_src_clk=%d",
 520		msm_host->mode->clock, msm_host->byte_clk_rate,
 521		msm_host->esc_clk_rate, msm_host->src_clk_rate);
 522
 523	ret = clk_set_rate(msm_host->byte_clk, msm_host->byte_clk_rate);
 524	if (ret) {
 525		pr_err("%s: Failed to set rate byte clk, %d\n", __func__, ret);
 526		goto error;
 527	}
 528
 529	ret = clk_set_rate(msm_host->esc_clk, msm_host->esc_clk_rate);
 530	if (ret) {
 531		pr_err("%s: Failed to set rate esc clk, %d\n", __func__, ret);
 532		goto error;
 533	}
 534
 535	ret = clk_set_rate(msm_host->src_clk, msm_host->src_clk_rate);
 536	if (ret) {
 537		pr_err("%s: Failed to set rate src clk, %d\n", __func__, ret);
 538		goto error;
 539	}
 540
 541	ret = clk_set_rate(msm_host->pixel_clk, msm_host->mode->clock * 1000);
 542	if (ret) {
 543		pr_err("%s: Failed to set rate pixel clk, %d\n", __func__, ret);
 544		goto error;
 545	}
 546
 547	ret = clk_prepare_enable(msm_host->byte_clk);
 548	if (ret) {
 549		pr_err("%s: Failed to enable dsi byte clk\n", __func__);
 550		goto error;
 551	}
 552
 553	ret = clk_prepare_enable(msm_host->esc_clk);
 554	if (ret) {
 555		pr_err("%s: Failed to enable dsi esc clk\n", __func__);
 556		goto esc_clk_err;
 557	}
 558
 559	ret = clk_prepare_enable(msm_host->src_clk);
 560	if (ret) {
 561		pr_err("%s: Failed to enable dsi src clk\n", __func__);
 562		goto src_clk_err;
 563	}
 564
 565	ret = clk_prepare_enable(msm_host->pixel_clk);
 566	if (ret) {
 567		pr_err("%s: Failed to enable dsi pixel clk\n", __func__);
 568		goto pixel_clk_err;
 569	}
 570
 571	return 0;
 572
 573pixel_clk_err:
 574	clk_disable_unprepare(msm_host->src_clk);
 575src_clk_err:
 576	clk_disable_unprepare(msm_host->esc_clk);
 577esc_clk_err:
 578	clk_disable_unprepare(msm_host->byte_clk);
 579error:
 580	return ret;
 581}
 582
 583static int dsi_link_clk_enable(struct msm_dsi_host *msm_host)
 584{
 585	const struct msm_dsi_cfg_handler *cfg_hnd = msm_host->cfg_hnd;
 586
 587	if (cfg_hnd->major == MSM_DSI_VER_MAJOR_6G)
 588		return dsi_link_clk_enable_6g(msm_host);
 589	else
 590		return dsi_link_clk_enable_v2(msm_host);
 591}
 592
 593static void dsi_link_clk_disable(struct msm_dsi_host *msm_host)
 594{
 595	const struct msm_dsi_cfg_handler *cfg_hnd = msm_host->cfg_hnd;
 596
 597	if (cfg_hnd->major == MSM_DSI_VER_MAJOR_6G) {
 598		clk_disable_unprepare(msm_host->esc_clk);
 599		clk_disable_unprepare(msm_host->pixel_clk);
 
 
 600		clk_disable_unprepare(msm_host->byte_clk);
 601	} else {
 602		clk_disable_unprepare(msm_host->pixel_clk);
 603		clk_disable_unprepare(msm_host->src_clk);
 604		clk_disable_unprepare(msm_host->esc_clk);
 605		clk_disable_unprepare(msm_host->byte_clk);
 606	}
 607}
 608
 609static int dsi_clk_ctrl(struct msm_dsi_host *msm_host, bool enable)
 610{
 611	int ret = 0;
 612
 613	mutex_lock(&msm_host->clk_mutex);
 614	if (enable) {
 615		ret = dsi_bus_clk_enable(msm_host);
 616		if (ret) {
 617			pr_err("%s: Can not enable bus clk, %d\n",
 618				__func__, ret);
 619			goto unlock_ret;
 620		}
 621		ret = dsi_link_clk_enable(msm_host);
 622		if (ret) {
 623			pr_err("%s: Can not enable link clk, %d\n",
 624				__func__, ret);
 625			dsi_bus_clk_disable(msm_host);
 626			goto unlock_ret;
 627		}
 628	} else {
 629		dsi_link_clk_disable(msm_host);
 630		dsi_bus_clk_disable(msm_host);
 631	}
 632
 633unlock_ret:
 634	mutex_unlock(&msm_host->clk_mutex);
 635	return ret;
 636}
 637
 638static int dsi_calc_clk_rate(struct msm_dsi_host *msm_host)
 639{
 640	struct drm_display_mode *mode = msm_host->mode;
 641	const struct msm_dsi_cfg_handler *cfg_hnd = msm_host->cfg_hnd;
 642	u8 lanes = msm_host->lanes;
 643	u32 bpp = dsi_get_bpp(msm_host->format);
 644	u32 pclk_rate;
 645
 646	if (!mode) {
 647		pr_err("%s: mode not set\n", __func__);
 648		return -EINVAL;
 649	}
 650
 651	pclk_rate = mode->clock * 1000;
 652	if (lanes > 0) {
 653		msm_host->byte_clk_rate = (pclk_rate * bpp) / (8 * lanes);
 654	} else {
 655		pr_err("%s: forcing mdss_dsi lanes to 1\n", __func__);
 656		msm_host->byte_clk_rate = (pclk_rate * bpp) / 8;
 657	}
 658
 659	DBG("pclk=%d, bclk=%d", pclk_rate, msm_host->byte_clk_rate);
 660
 661	msm_host->esc_clk_rate = clk_get_rate(msm_host->esc_clk);
 662
 663	if (cfg_hnd->major == MSM_DSI_VER_MAJOR_V2) {
 664		unsigned int esc_mhz, esc_div;
 665		unsigned long byte_mhz;
 666
 667		msm_host->src_clk_rate = (pclk_rate * bpp) / 8;
 668
 669		/*
 670		 * esc clock is byte clock followed by a 4 bit divider,
 671		 * we need to find an escape clock frequency within the
 672		 * mipi DSI spec range within the maximum divider limit
 673		 * We iterate here between an escape clock frequencey
 674		 * between 20 Mhz to 5 Mhz and pick up the first one
 675		 * that can be supported by our divider
 676		 */
 677
 678		byte_mhz = msm_host->byte_clk_rate / 1000000;
 679
 680		for (esc_mhz = 20; esc_mhz >= 5; esc_mhz--) {
 681			esc_div = DIV_ROUND_UP(byte_mhz, esc_mhz);
 682
 683			/*
 684			 * TODO: Ideally, we shouldn't know what sort of divider
 685			 * is available in mmss_cc, we're just assuming that
 686			 * it'll always be a 4 bit divider. Need to come up with
 687			 * a better way here.
 688			 */
 689			if (esc_div >= 1 && esc_div <= 16)
 690				break;
 691		}
 692
 693		if (esc_mhz < 5)
 694			return -EINVAL;
 695
 696		msm_host->esc_clk_rate = msm_host->byte_clk_rate / esc_div;
 697
 698		DBG("esc=%d, src=%d", msm_host->esc_clk_rate,
 699			msm_host->src_clk_rate);
 700	}
 701
 702	return 0;
 703}
 704
 705static void dsi_phy_sw_reset(struct msm_dsi_host *msm_host)
 706{
 707	DBG("");
 708	dsi_write(msm_host, REG_DSI_PHY_RESET, DSI_PHY_RESET_RESET);
 709	/* Make sure fully reset */
 710	wmb();
 711	udelay(1000);
 712	dsi_write(msm_host, REG_DSI_PHY_RESET, 0);
 713	udelay(100);
 714}
 715
 716static void dsi_intr_ctrl(struct msm_dsi_host *msm_host, u32 mask, int enable)
 717{
 718	u32 intr;
 719	unsigned long flags;
 720
 721	spin_lock_irqsave(&msm_host->intr_lock, flags);
 722	intr = dsi_read(msm_host, REG_DSI_INTR_CTRL);
 723
 724	if (enable)
 725		intr |= mask;
 726	else
 727		intr &= ~mask;
 728
 729	DBG("intr=%x enable=%d", intr, enable);
 730
 731	dsi_write(msm_host, REG_DSI_INTR_CTRL, intr);
 732	spin_unlock_irqrestore(&msm_host->intr_lock, flags);
 733}
 734
 735static inline enum dsi_traffic_mode dsi_get_traffic_mode(const u32 mode_flags)
 736{
 737	if (mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
 738		return BURST_MODE;
 739	else if (mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
 740		return NON_BURST_SYNCH_PULSE;
 741
 742	return NON_BURST_SYNCH_EVENT;
 743}
 744
 745static inline enum dsi_vid_dst_format dsi_get_vid_fmt(
 746				const enum mipi_dsi_pixel_format mipi_fmt)
 747{
 748	switch (mipi_fmt) {
 749	case MIPI_DSI_FMT_RGB888:	return VID_DST_FORMAT_RGB888;
 750	case MIPI_DSI_FMT_RGB666:	return VID_DST_FORMAT_RGB666_LOOSE;
 751	case MIPI_DSI_FMT_RGB666_PACKED:	return VID_DST_FORMAT_RGB666;
 752	case MIPI_DSI_FMT_RGB565:	return VID_DST_FORMAT_RGB565;
 753	default:			return VID_DST_FORMAT_RGB888;
 754	}
 755}
 756
 757static inline enum dsi_cmd_dst_format dsi_get_cmd_fmt(
 758				const enum mipi_dsi_pixel_format mipi_fmt)
 759{
 760	switch (mipi_fmt) {
 761	case MIPI_DSI_FMT_RGB888:	return CMD_DST_FORMAT_RGB888;
 762	case MIPI_DSI_FMT_RGB666_PACKED:
 763	case MIPI_DSI_FMT_RGB666:	return VID_DST_FORMAT_RGB666;
 764	case MIPI_DSI_FMT_RGB565:	return CMD_DST_FORMAT_RGB565;
 765	default:			return CMD_DST_FORMAT_RGB888;
 766	}
 767}
 768
 769static void dsi_ctrl_config(struct msm_dsi_host *msm_host, bool enable,
 770				u32 clk_pre, u32 clk_post)
 771{
 772	u32 flags = msm_host->mode_flags;
 773	enum mipi_dsi_pixel_format mipi_fmt = msm_host->format;
 774	const struct msm_dsi_cfg_handler *cfg_hnd = msm_host->cfg_hnd;
 775	u32 data = 0;
 776
 777	if (!enable) {
 778		dsi_write(msm_host, REG_DSI_CTRL, 0);
 779		return;
 780	}
 781
 782	if (flags & MIPI_DSI_MODE_VIDEO) {
 783		if (flags & MIPI_DSI_MODE_VIDEO_HSE)
 784			data |= DSI_VID_CFG0_PULSE_MODE_HSA_HE;
 785		if (flags & MIPI_DSI_MODE_VIDEO_HFP)
 786			data |= DSI_VID_CFG0_HFP_POWER_STOP;
 787		if (flags & MIPI_DSI_MODE_VIDEO_HBP)
 788			data |= DSI_VID_CFG0_HBP_POWER_STOP;
 789		if (flags & MIPI_DSI_MODE_VIDEO_HSA)
 790			data |= DSI_VID_CFG0_HSA_POWER_STOP;
 791		/* Always set low power stop mode for BLLP
 792		 * to let command engine send packets
 793		 */
 794		data |= DSI_VID_CFG0_EOF_BLLP_POWER_STOP |
 795			DSI_VID_CFG0_BLLP_POWER_STOP;
 796		data |= DSI_VID_CFG0_TRAFFIC_MODE(dsi_get_traffic_mode(flags));
 797		data |= DSI_VID_CFG0_DST_FORMAT(dsi_get_vid_fmt(mipi_fmt));
 798		data |= DSI_VID_CFG0_VIRT_CHANNEL(msm_host->channel);
 799		dsi_write(msm_host, REG_DSI_VID_CFG0, data);
 800
 801		/* Do not swap RGB colors */
 802		data = DSI_VID_CFG1_RGB_SWAP(SWAP_RGB);
 803		dsi_write(msm_host, REG_DSI_VID_CFG1, 0);
 804	} else {
 805		/* Do not swap RGB colors */
 806		data = DSI_CMD_CFG0_RGB_SWAP(SWAP_RGB);
 807		data |= DSI_CMD_CFG0_DST_FORMAT(dsi_get_cmd_fmt(mipi_fmt));
 808		dsi_write(msm_host, REG_DSI_CMD_CFG0, data);
 809
 810		data = DSI_CMD_CFG1_WR_MEM_START(MIPI_DCS_WRITE_MEMORY_START) |
 811			DSI_CMD_CFG1_WR_MEM_CONTINUE(
 812					MIPI_DCS_WRITE_MEMORY_CONTINUE);
 813		/* Always insert DCS command */
 814		data |= DSI_CMD_CFG1_INSERT_DCS_COMMAND;
 815		dsi_write(msm_host, REG_DSI_CMD_CFG1, data);
 816	}
 817
 818	dsi_write(msm_host, REG_DSI_CMD_DMA_CTRL,
 819			DSI_CMD_DMA_CTRL_FROM_FRAME_BUFFER |
 820			DSI_CMD_DMA_CTRL_LOW_POWER);
 821
 822	data = 0;
 823	/* Always assume dedicated TE pin */
 824	data |= DSI_TRIG_CTRL_TE;
 825	data |= DSI_TRIG_CTRL_MDP_TRIGGER(TRIGGER_NONE);
 826	data |= DSI_TRIG_CTRL_DMA_TRIGGER(TRIGGER_SW);
 827	data |= DSI_TRIG_CTRL_STREAM(msm_host->channel);
 828	if ((cfg_hnd->major == MSM_DSI_VER_MAJOR_6G) &&
 829		(cfg_hnd->minor >= MSM_DSI_6G_VER_MINOR_V1_2))
 830		data |= DSI_TRIG_CTRL_BLOCK_DMA_WITHIN_FRAME;
 831	dsi_write(msm_host, REG_DSI_TRIG_CTRL, data);
 832
 833	data = DSI_CLKOUT_TIMING_CTRL_T_CLK_POST(clk_post) |
 834		DSI_CLKOUT_TIMING_CTRL_T_CLK_PRE(clk_pre);
 835	dsi_write(msm_host, REG_DSI_CLKOUT_TIMING_CTRL, data);
 836
 
 
 
 
 
 
 837	data = 0;
 838	if (!(flags & MIPI_DSI_MODE_EOT_PACKET))
 839		data |= DSI_EOT_PACKET_CTRL_TX_EOT_APPEND;
 840	dsi_write(msm_host, REG_DSI_EOT_PACKET_CTRL, data);
 841
 842	/* allow only ack-err-status to generate interrupt */
 843	dsi_write(msm_host, REG_DSI_ERR_INT_MASK0, 0x13ff3fe0);
 844
 845	dsi_intr_ctrl(msm_host, DSI_IRQ_MASK_ERROR, 1);
 846
 847	dsi_write(msm_host, REG_DSI_CLK_CTRL, DSI_CLK_CTRL_ENABLE_CLKS);
 848
 849	data = DSI_CTRL_CLK_EN;
 850
 851	DBG("lane number=%d", msm_host->lanes);
 852	data |= ((DSI_CTRL_LANE0 << msm_host->lanes) - DSI_CTRL_LANE0);
 853
 854	dsi_write(msm_host, REG_DSI_LANE_SWAP_CTRL,
 855		  DSI_LANE_SWAP_CTRL_DLN_SWAP_SEL(msm_host->dlane_swap));
 856
 857	if (!(flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
 858		dsi_write(msm_host, REG_DSI_LANE_CTRL,
 859			DSI_LANE_CTRL_CLKLN_HS_FORCE_REQUEST);
 860
 861	data |= DSI_CTRL_ENABLE;
 862
 863	dsi_write(msm_host, REG_DSI_CTRL, data);
 864}
 865
 866static void dsi_timing_setup(struct msm_dsi_host *msm_host)
 867{
 868	struct drm_display_mode *mode = msm_host->mode;
 869	u32 hs_start = 0, vs_start = 0; /* take sync start as 0 */
 870	u32 h_total = mode->htotal;
 871	u32 v_total = mode->vtotal;
 872	u32 hs_end = mode->hsync_end - mode->hsync_start;
 873	u32 vs_end = mode->vsync_end - mode->vsync_start;
 874	u32 ha_start = h_total - mode->hsync_start;
 875	u32 ha_end = ha_start + mode->hdisplay;
 876	u32 va_start = v_total - mode->vsync_start;
 877	u32 va_end = va_start + mode->vdisplay;
 878	u32 wc;
 879
 880	DBG("");
 881
 882	if (msm_host->mode_flags & MIPI_DSI_MODE_VIDEO) {
 883		dsi_write(msm_host, REG_DSI_ACTIVE_H,
 884			DSI_ACTIVE_H_START(ha_start) |
 885			DSI_ACTIVE_H_END(ha_end));
 886		dsi_write(msm_host, REG_DSI_ACTIVE_V,
 887			DSI_ACTIVE_V_START(va_start) |
 888			DSI_ACTIVE_V_END(va_end));
 889		dsi_write(msm_host, REG_DSI_TOTAL,
 890			DSI_TOTAL_H_TOTAL(h_total - 1) |
 891			DSI_TOTAL_V_TOTAL(v_total - 1));
 892
 893		dsi_write(msm_host, REG_DSI_ACTIVE_HSYNC,
 894			DSI_ACTIVE_HSYNC_START(hs_start) |
 895			DSI_ACTIVE_HSYNC_END(hs_end));
 896		dsi_write(msm_host, REG_DSI_ACTIVE_VSYNC_HPOS, 0);
 897		dsi_write(msm_host, REG_DSI_ACTIVE_VSYNC_VPOS,
 898			DSI_ACTIVE_VSYNC_VPOS_START(vs_start) |
 899			DSI_ACTIVE_VSYNC_VPOS_END(vs_end));
 900	} else {		/* command mode */
 901		/* image data and 1 byte write_memory_start cmd */
 902		wc = mode->hdisplay * dsi_get_bpp(msm_host->format) / 8 + 1;
 903
 904		dsi_write(msm_host, REG_DSI_CMD_MDP_STREAM_CTRL,
 905			DSI_CMD_MDP_STREAM_CTRL_WORD_COUNT(wc) |
 906			DSI_CMD_MDP_STREAM_CTRL_VIRTUAL_CHANNEL(
 907					msm_host->channel) |
 908			DSI_CMD_MDP_STREAM_CTRL_DATA_TYPE(
 909					MIPI_DSI_DCS_LONG_WRITE));
 910
 911		dsi_write(msm_host, REG_DSI_CMD_MDP_STREAM_TOTAL,
 912			DSI_CMD_MDP_STREAM_TOTAL_H_TOTAL(mode->hdisplay) |
 913			DSI_CMD_MDP_STREAM_TOTAL_V_TOTAL(mode->vdisplay));
 914	}
 915}
 916
 917static void dsi_sw_reset(struct msm_dsi_host *msm_host)
 918{
 919	dsi_write(msm_host, REG_DSI_CLK_CTRL, DSI_CLK_CTRL_ENABLE_CLKS);
 920	wmb(); /* clocks need to be enabled before reset */
 921
 922	dsi_write(msm_host, REG_DSI_RESET, 1);
 923	wmb(); /* make sure reset happen */
 924	dsi_write(msm_host, REG_DSI_RESET, 0);
 925}
 926
 927static void dsi_op_mode_config(struct msm_dsi_host *msm_host,
 928					bool video_mode, bool enable)
 929{
 930	u32 dsi_ctrl;
 931
 932	dsi_ctrl = dsi_read(msm_host, REG_DSI_CTRL);
 933
 934	if (!enable) {
 935		dsi_ctrl &= ~(DSI_CTRL_ENABLE | DSI_CTRL_VID_MODE_EN |
 936				DSI_CTRL_CMD_MODE_EN);
 937		dsi_intr_ctrl(msm_host, DSI_IRQ_MASK_CMD_MDP_DONE |
 938					DSI_IRQ_MASK_VIDEO_DONE, 0);
 939	} else {
 940		if (video_mode) {
 941			dsi_ctrl |= DSI_CTRL_VID_MODE_EN;
 942		} else {		/* command mode */
 943			dsi_ctrl |= DSI_CTRL_CMD_MODE_EN;
 944			dsi_intr_ctrl(msm_host, DSI_IRQ_MASK_CMD_MDP_DONE, 1);
 945		}
 946		dsi_ctrl |= DSI_CTRL_ENABLE;
 947	}
 948
 949	dsi_write(msm_host, REG_DSI_CTRL, dsi_ctrl);
 950}
 951
 952static void dsi_set_tx_power_mode(int mode, struct msm_dsi_host *msm_host)
 953{
 954	u32 data;
 955
 956	data = dsi_read(msm_host, REG_DSI_CMD_DMA_CTRL);
 957
 958	if (mode == 0)
 959		data &= ~DSI_CMD_DMA_CTRL_LOW_POWER;
 960	else
 961		data |= DSI_CMD_DMA_CTRL_LOW_POWER;
 962
 963	dsi_write(msm_host, REG_DSI_CMD_DMA_CTRL, data);
 964}
 965
 966static void dsi_wait4video_done(struct msm_dsi_host *msm_host)
 967{
 
 
 
 968	dsi_intr_ctrl(msm_host, DSI_IRQ_MASK_VIDEO_DONE, 1);
 969
 970	reinit_completion(&msm_host->video_comp);
 971
 972	wait_for_completion_timeout(&msm_host->video_comp,
 973			msecs_to_jiffies(70));
 974
 
 
 
 975	dsi_intr_ctrl(msm_host, DSI_IRQ_MASK_VIDEO_DONE, 0);
 976}
 977
 978static void dsi_wait4video_eng_busy(struct msm_dsi_host *msm_host)
 979{
 980	if (!(msm_host->mode_flags & MIPI_DSI_MODE_VIDEO))
 981		return;
 982
 983	if (msm_host->power_on) {
 984		dsi_wait4video_done(msm_host);
 985		/* delay 4 ms to skip BLLP */
 986		usleep_range(2000, 4000);
 987	}
 988}
 989
 990/* dsi_cmd */
 991static int dsi_tx_buf_alloc(struct msm_dsi_host *msm_host, int size)
 992{
 993	struct drm_device *dev = msm_host->dev;
 
 994	const struct msm_dsi_cfg_handler *cfg_hnd = msm_host->cfg_hnd;
 995	int ret;
 996	u32 iova;
 997
 998	if (cfg_hnd->major == MSM_DSI_VER_MAJOR_6G) {
 999		mutex_lock(&dev->struct_mutex);
1000		msm_host->tx_gem_obj = msm_gem_new(dev, size, MSM_BO_UNCACHED);
1001		if (IS_ERR(msm_host->tx_gem_obj)) {
1002			ret = PTR_ERR(msm_host->tx_gem_obj);
1003			pr_err("%s: failed to allocate gem, %d\n",
1004				__func__, ret);
1005			msm_host->tx_gem_obj = NULL;
1006			mutex_unlock(&dev->struct_mutex);
1007			return ret;
1008		}
1009
1010		ret = msm_gem_get_iova_locked(msm_host->tx_gem_obj, 0, &iova);
 
1011		mutex_unlock(&dev->struct_mutex);
1012		if (ret) {
1013			pr_err("%s: failed to get iova, %d\n", __func__, ret);
1014			return ret;
1015		}
1016
1017		if (iova & 0x07) {
1018			pr_err("%s: buf NOT 8 bytes aligned\n", __func__);
1019			return -EINVAL;
1020		}
1021
1022		msm_host->tx_size = msm_host->tx_gem_obj->size;
1023	} else {
1024		msm_host->tx_buf = dma_alloc_coherent(dev->dev, size,
1025					&msm_host->tx_buf_paddr, GFP_KERNEL);
1026		if (!msm_host->tx_buf) {
1027			ret = -ENOMEM;
1028			pr_err("%s: failed to allocate tx buf, %d\n",
1029				__func__, ret);
1030			return ret;
1031		}
1032
1033		msm_host->tx_size = size;
1034	}
1035
1036	return 0;
1037}
1038
1039static void dsi_tx_buf_free(struct msm_dsi_host *msm_host)
1040{
1041	struct drm_device *dev = msm_host->dev;
1042
1043	if (msm_host->tx_gem_obj) {
1044		msm_gem_put_iova(msm_host->tx_gem_obj, 0);
1045		mutex_lock(&dev->struct_mutex);
1046		msm_gem_free_object(msm_host->tx_gem_obj);
1047		msm_host->tx_gem_obj = NULL;
1048		mutex_unlock(&dev->struct_mutex);
1049	}
1050
1051	if (msm_host->tx_buf)
1052		dma_free_coherent(dev->dev, msm_host->tx_size, msm_host->tx_buf,
1053			msm_host->tx_buf_paddr);
1054}
1055
1056/*
1057 * prepare cmd buffer to be txed
1058 */
1059static int dsi_cmd_dma_add(struct msm_dsi_host *msm_host,
1060			   const struct mipi_dsi_msg *msg)
1061{
1062	const struct msm_dsi_cfg_handler *cfg_hnd = msm_host->cfg_hnd;
1063	struct mipi_dsi_packet packet;
1064	int len;
1065	int ret;
1066	u8 *data;
1067
1068	ret = mipi_dsi_create_packet(&packet, msg);
1069	if (ret) {
1070		pr_err("%s: create packet failed, %d\n", __func__, ret);
1071		return ret;
1072	}
1073	len = (packet.size + 3) & (~0x3);
1074
1075	if (len > msm_host->tx_size) {
1076		pr_err("%s: packet size is too big\n", __func__);
1077		return -EINVAL;
1078	}
1079
1080	if (cfg_hnd->major == MSM_DSI_VER_MAJOR_6G) {
1081		data = msm_gem_vaddr(msm_host->tx_gem_obj);
1082		if (IS_ERR(data)) {
1083			ret = PTR_ERR(data);
1084			pr_err("%s: get vaddr failed, %d\n", __func__, ret);
1085			return ret;
1086		}
1087	} else {
1088		data = msm_host->tx_buf;
1089	}
1090
1091	/* MSM specific command format in memory */
1092	data[0] = packet.header[1];
1093	data[1] = packet.header[2];
1094	data[2] = packet.header[0];
1095	data[3] = BIT(7); /* Last packet */
1096	if (mipi_dsi_packet_format_is_long(msg->type))
1097		data[3] |= BIT(6);
1098	if (msg->rx_buf && msg->rx_len)
1099		data[3] |= BIT(5);
1100
1101	/* Long packet */
1102	if (packet.payload && packet.payload_length)
1103		memcpy(data + 4, packet.payload, packet.payload_length);
1104
1105	/* Append 0xff to the end */
1106	if (packet.size < len)
1107		memset(data + packet.size, 0xff, len - packet.size);
1108
 
 
 
1109	return len;
1110}
1111
1112/*
1113 * dsi_short_read1_resp: 1 parameter
1114 */
1115static int dsi_short_read1_resp(u8 *buf, const struct mipi_dsi_msg *msg)
1116{
1117	u8 *data = msg->rx_buf;
1118	if (data && (msg->rx_len >= 1)) {
1119		*data = buf[1]; /* strip out dcs type */
1120		return 1;
1121	} else {
1122		pr_err("%s: read data does not match with rx_buf len %zu\n",
1123			__func__, msg->rx_len);
1124		return -EINVAL;
1125	}
1126}
1127
1128/*
1129 * dsi_short_read2_resp: 2 parameter
1130 */
1131static int dsi_short_read2_resp(u8 *buf, const struct mipi_dsi_msg *msg)
1132{
1133	u8 *data = msg->rx_buf;
1134	if (data && (msg->rx_len >= 2)) {
1135		data[0] = buf[1]; /* strip out dcs type */
1136		data[1] = buf[2];
1137		return 2;
1138	} else {
1139		pr_err("%s: read data does not match with rx_buf len %zu\n",
1140			__func__, msg->rx_len);
1141		return -EINVAL;
1142	}
1143}
1144
1145static int dsi_long_read_resp(u8 *buf, const struct mipi_dsi_msg *msg)
1146{
1147	/* strip out 4 byte dcs header */
1148	if (msg->rx_buf && msg->rx_len)
1149		memcpy(msg->rx_buf, buf + 4, msg->rx_len);
1150
1151	return msg->rx_len;
1152}
1153
1154static int dsi_cmd_dma_tx(struct msm_dsi_host *msm_host, int len)
1155{
1156	const struct msm_dsi_cfg_handler *cfg_hnd = msm_host->cfg_hnd;
 
 
1157	int ret;
1158	u32 dma_base;
1159	bool triggered;
1160
1161	if (cfg_hnd->major == MSM_DSI_VER_MAJOR_6G) {
1162		ret = msm_gem_get_iova(msm_host->tx_gem_obj, 0, &dma_base);
 
1163		if (ret) {
1164			pr_err("%s: failed to get iova: %d\n", __func__, ret);
1165			return ret;
1166		}
1167	} else {
1168		dma_base = msm_host->tx_buf_paddr;
1169	}
1170
1171	reinit_completion(&msm_host->dma_comp);
1172
1173	dsi_wait4video_eng_busy(msm_host);
1174
1175	triggered = msm_dsi_manager_cmd_xfer_trigger(
1176						msm_host->id, dma_base, len);
1177	if (triggered) {
1178		ret = wait_for_completion_timeout(&msm_host->dma_comp,
1179					msecs_to_jiffies(200));
1180		DBG("ret=%d", ret);
1181		if (ret == 0)
1182			ret = -ETIMEDOUT;
1183		else
1184			ret = len;
1185	} else
1186		ret = len;
1187
1188	return ret;
1189}
1190
1191static int dsi_cmd_dma_rx(struct msm_dsi_host *msm_host,
1192			u8 *buf, int rx_byte, int pkt_size)
1193{
1194	u32 *lp, *temp, data;
1195	int i, j = 0, cnt;
1196	u32 read_cnt;
1197	u8 reg[16];
1198	int repeated_bytes = 0;
1199	int buf_offset = buf - msm_host->rx_buf;
1200
1201	lp = (u32 *)buf;
1202	temp = (u32 *)reg;
1203	cnt = (rx_byte + 3) >> 2;
1204	if (cnt > 4)
1205		cnt = 4; /* 4 x 32 bits registers only */
1206
1207	if (rx_byte == 4)
1208		read_cnt = 4;
1209	else
1210		read_cnt = pkt_size + 6;
1211
1212	/*
1213	 * In case of multiple reads from the panel, after the first read, there
1214	 * is possibility that there are some bytes in the payload repeating in
1215	 * the RDBK_DATA registers. Since we read all the parameters from the
1216	 * panel right from the first byte for every pass. We need to skip the
1217	 * repeating bytes and then append the new parameters to the rx buffer.
1218	 */
1219	if (read_cnt > 16) {
1220		int bytes_shifted;
1221		/* Any data more than 16 bytes will be shifted out.
1222		 * The temp read buffer should already contain these bytes.
1223		 * The remaining bytes in read buffer are the repeated bytes.
1224		 */
1225		bytes_shifted = read_cnt - 16;
1226		repeated_bytes = buf_offset - bytes_shifted;
1227	}
1228
1229	for (i = cnt - 1; i >= 0; i--) {
1230		data = dsi_read(msm_host, REG_DSI_RDBK_DATA(i));
1231		*temp++ = ntohl(data); /* to host byte order */
1232		DBG("data = 0x%x and ntohl(data) = 0x%x", data, ntohl(data));
1233	}
1234
1235	for (i = repeated_bytes; i < 16; i++)
1236		buf[j++] = reg[i];
1237
1238	return j;
1239}
1240
1241static int dsi_cmds2buf_tx(struct msm_dsi_host *msm_host,
1242				const struct mipi_dsi_msg *msg)
1243{
1244	int len, ret;
1245	int bllp_len = msm_host->mode->hdisplay *
1246			dsi_get_bpp(msm_host->format) / 8;
1247
1248	len = dsi_cmd_dma_add(msm_host, msg);
1249	if (!len) {
1250		pr_err("%s: failed to add cmd type = 0x%x\n",
1251			__func__,  msg->type);
1252		return -EINVAL;
1253	}
1254
1255	/* for video mode, do not send cmds more than
1256	* one pixel line, since it only transmit it
1257	* during BLLP.
1258	*/
1259	/* TODO: if the command is sent in LP mode, the bit rate is only
1260	 * half of esc clk rate. In this case, if the video is already
1261	 * actively streaming, we need to check more carefully if the
1262	 * command can be fit into one BLLP.
1263	 */
1264	if ((msm_host->mode_flags & MIPI_DSI_MODE_VIDEO) && (len > bllp_len)) {
1265		pr_err("%s: cmd cannot fit into BLLP period, len=%d\n",
1266			__func__, len);
1267		return -EINVAL;
1268	}
1269
1270	ret = dsi_cmd_dma_tx(msm_host, len);
1271	if (ret < len) {
1272		pr_err("%s: cmd dma tx failed, type=0x%x, data0=0x%x, len=%d\n",
1273			__func__, msg->type, (*(u8 *)(msg->tx_buf)), len);
1274		return -ECOMM;
1275	}
1276
1277	return len;
1278}
1279
1280static void dsi_sw_reset_restore(struct msm_dsi_host *msm_host)
1281{
1282	u32 data0, data1;
1283
1284	data0 = dsi_read(msm_host, REG_DSI_CTRL);
1285	data1 = data0;
1286	data1 &= ~DSI_CTRL_ENABLE;
1287	dsi_write(msm_host, REG_DSI_CTRL, data1);
1288	/*
1289	 * dsi controller need to be disabled before
1290	 * clocks turned on
1291	 */
1292	wmb();
1293
1294	dsi_write(msm_host, REG_DSI_CLK_CTRL, DSI_CLK_CTRL_ENABLE_CLKS);
1295	wmb();	/* make sure clocks enabled */
1296
1297	/* dsi controller can only be reset while clocks are running */
1298	dsi_write(msm_host, REG_DSI_RESET, 1);
1299	wmb();	/* make sure reset happen */
1300	dsi_write(msm_host, REG_DSI_RESET, 0);
1301	wmb();	/* controller out of reset */
1302	dsi_write(msm_host, REG_DSI_CTRL, data0);
1303	wmb();	/* make sure dsi controller enabled again */
1304}
1305
 
 
 
 
 
 
 
 
1306static void dsi_err_worker(struct work_struct *work)
1307{
1308	struct msm_dsi_host *msm_host =
1309		container_of(work, struct msm_dsi_host, err_work);
1310	u32 status = msm_host->err_work_state;
1311
1312	pr_err_ratelimited("%s: status=%x\n", __func__, status);
1313	if (status & DSI_ERR_STATE_MDP_FIFO_UNDERFLOW)
1314		dsi_sw_reset_restore(msm_host);
1315
1316	/* It is safe to clear here because error irq is disabled. */
1317	msm_host->err_work_state = 0;
1318
1319	/* enable dsi error interrupt */
1320	dsi_intr_ctrl(msm_host, DSI_IRQ_MASK_ERROR, 1);
1321}
1322
1323static void dsi_ack_err_status(struct msm_dsi_host *msm_host)
1324{
1325	u32 status;
1326
1327	status = dsi_read(msm_host, REG_DSI_ACK_ERR_STATUS);
1328
1329	if (status) {
1330		dsi_write(msm_host, REG_DSI_ACK_ERR_STATUS, status);
1331		/* Writing of an extra 0 needed to clear error bits */
1332		dsi_write(msm_host, REG_DSI_ACK_ERR_STATUS, 0);
1333		msm_host->err_work_state |= DSI_ERR_STATE_ACK;
1334	}
1335}
1336
1337static void dsi_timeout_status(struct msm_dsi_host *msm_host)
1338{
1339	u32 status;
1340
1341	status = dsi_read(msm_host, REG_DSI_TIMEOUT_STATUS);
1342
1343	if (status) {
1344		dsi_write(msm_host, REG_DSI_TIMEOUT_STATUS, status);
1345		msm_host->err_work_state |= DSI_ERR_STATE_TIMEOUT;
1346	}
1347}
1348
1349static void dsi_dln0_phy_err(struct msm_dsi_host *msm_host)
1350{
1351	u32 status;
1352
1353	status = dsi_read(msm_host, REG_DSI_DLN0_PHY_ERR);
1354
1355	if (status & (DSI_DLN0_PHY_ERR_DLN0_ERR_ESC |
1356			DSI_DLN0_PHY_ERR_DLN0_ERR_SYNC_ESC |
1357			DSI_DLN0_PHY_ERR_DLN0_ERR_CONTROL |
1358			DSI_DLN0_PHY_ERR_DLN0_ERR_CONTENTION_LP0 |
1359			DSI_DLN0_PHY_ERR_DLN0_ERR_CONTENTION_LP1)) {
1360		dsi_write(msm_host, REG_DSI_DLN0_PHY_ERR, status);
1361		msm_host->err_work_state |= DSI_ERR_STATE_DLN0_PHY;
1362	}
1363}
1364
1365static void dsi_fifo_status(struct msm_dsi_host *msm_host)
1366{
1367	u32 status;
1368
1369	status = dsi_read(msm_host, REG_DSI_FIFO_STATUS);
1370
1371	/* fifo underflow, overflow */
1372	if (status) {
1373		dsi_write(msm_host, REG_DSI_FIFO_STATUS, status);
1374		msm_host->err_work_state |= DSI_ERR_STATE_FIFO;
1375		if (status & DSI_FIFO_STATUS_CMD_MDP_FIFO_UNDERFLOW)
1376			msm_host->err_work_state |=
1377					DSI_ERR_STATE_MDP_FIFO_UNDERFLOW;
1378	}
1379}
1380
1381static void dsi_status(struct msm_dsi_host *msm_host)
1382{
1383	u32 status;
1384
1385	status = dsi_read(msm_host, REG_DSI_STATUS0);
1386
1387	if (status & DSI_STATUS0_INTERLEAVE_OP_CONTENTION) {
1388		dsi_write(msm_host, REG_DSI_STATUS0, status);
1389		msm_host->err_work_state |=
1390			DSI_ERR_STATE_INTERLEAVE_OP_CONTENTION;
1391	}
1392}
1393
1394static void dsi_clk_status(struct msm_dsi_host *msm_host)
1395{
1396	u32 status;
1397
1398	status = dsi_read(msm_host, REG_DSI_CLK_STATUS);
1399
1400	if (status & DSI_CLK_STATUS_PLL_UNLOCKED) {
1401		dsi_write(msm_host, REG_DSI_CLK_STATUS, status);
1402		msm_host->err_work_state |= DSI_ERR_STATE_PLL_UNLOCKED;
1403	}
1404}
1405
1406static void dsi_error(struct msm_dsi_host *msm_host)
1407{
1408	/* disable dsi error interrupt */
1409	dsi_intr_ctrl(msm_host, DSI_IRQ_MASK_ERROR, 0);
1410
1411	dsi_clk_status(msm_host);
1412	dsi_fifo_status(msm_host);
1413	dsi_ack_err_status(msm_host);
1414	dsi_timeout_status(msm_host);
1415	dsi_status(msm_host);
1416	dsi_dln0_phy_err(msm_host);
1417
1418	queue_work(msm_host->workqueue, &msm_host->err_work);
1419}
1420
1421static irqreturn_t dsi_host_irq(int irq, void *ptr)
1422{
1423	struct msm_dsi_host *msm_host = ptr;
1424	u32 isr;
1425	unsigned long flags;
1426
1427	if (!msm_host->ctrl_base)
1428		return IRQ_HANDLED;
1429
1430	spin_lock_irqsave(&msm_host->intr_lock, flags);
1431	isr = dsi_read(msm_host, REG_DSI_INTR_CTRL);
1432	dsi_write(msm_host, REG_DSI_INTR_CTRL, isr);
1433	spin_unlock_irqrestore(&msm_host->intr_lock, flags);
1434
1435	DBG("isr=0x%x, id=%d", isr, msm_host->id);
1436
1437	if (isr & DSI_IRQ_ERROR)
1438		dsi_error(msm_host);
1439
1440	if (isr & DSI_IRQ_VIDEO_DONE)
1441		complete(&msm_host->video_comp);
1442
1443	if (isr & DSI_IRQ_CMD_DMA_DONE)
1444		complete(&msm_host->dma_comp);
1445
1446	return IRQ_HANDLED;
1447}
1448
1449static int dsi_host_init_panel_gpios(struct msm_dsi_host *msm_host,
1450			struct device *panel_device)
1451{
1452	msm_host->disp_en_gpio = devm_gpiod_get_optional(panel_device,
1453							 "disp-enable",
1454							 GPIOD_OUT_LOW);
1455	if (IS_ERR(msm_host->disp_en_gpio)) {
1456		DBG("cannot get disp-enable-gpios %ld",
1457				PTR_ERR(msm_host->disp_en_gpio));
1458		return PTR_ERR(msm_host->disp_en_gpio);
1459	}
1460
1461	msm_host->te_gpio = devm_gpiod_get_optional(panel_device, "disp-te",
1462								GPIOD_IN);
1463	if (IS_ERR(msm_host->te_gpio)) {
1464		DBG("cannot get disp-te-gpios %ld", PTR_ERR(msm_host->te_gpio));
1465		return PTR_ERR(msm_host->te_gpio);
1466	}
1467
1468	return 0;
1469}
1470
1471static int dsi_host_attach(struct mipi_dsi_host *host,
1472					struct mipi_dsi_device *dsi)
1473{
1474	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
1475	int ret;
1476
1477	if (dsi->lanes > msm_host->num_data_lanes)
1478		return -EINVAL;
1479
1480	msm_host->channel = dsi->channel;
1481	msm_host->lanes = dsi->lanes;
1482	msm_host->format = dsi->format;
1483	msm_host->mode_flags = dsi->mode_flags;
1484
 
 
1485	/* Some gpios defined in panel DT need to be controlled by host */
1486	ret = dsi_host_init_panel_gpios(msm_host, &dsi->dev);
1487	if (ret)
1488		return ret;
1489
1490	DBG("id=%d", msm_host->id);
1491	if (msm_host->dev)
1492		drm_helper_hpd_irq_event(msm_host->dev);
1493
1494	return 0;
1495}
1496
1497static int dsi_host_detach(struct mipi_dsi_host *host,
1498					struct mipi_dsi_device *dsi)
1499{
1500	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
1501
1502	msm_host->device_node = NULL;
1503
1504	DBG("id=%d", msm_host->id);
1505	if (msm_host->dev)
1506		drm_helper_hpd_irq_event(msm_host->dev);
1507
1508	return 0;
1509}
1510
1511static ssize_t dsi_host_transfer(struct mipi_dsi_host *host,
1512					const struct mipi_dsi_msg *msg)
1513{
1514	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
1515	int ret;
1516
1517	if (!msg || !msm_host->power_on)
1518		return -EINVAL;
1519
1520	mutex_lock(&msm_host->cmd_mutex);
1521	ret = msm_dsi_manager_cmd_xfer(msm_host->id, msg);
1522	mutex_unlock(&msm_host->cmd_mutex);
1523
1524	return ret;
1525}
1526
1527static struct mipi_dsi_host_ops dsi_host_ops = {
1528	.attach = dsi_host_attach,
1529	.detach = dsi_host_detach,
1530	.transfer = dsi_host_transfer,
1531};
1532
1533/*
1534 * List of supported physical to logical lane mappings.
1535 * For example, the 2nd entry represents the following mapping:
1536 *
1537 * "3012": Logic 3->Phys 0; Logic 0->Phys 1; Logic 1->Phys 2; Logic 2->Phys 3;
1538 */
1539static const int supported_data_lane_swaps[][4] = {
1540	{ 0, 1, 2, 3 },
1541	{ 3, 0, 1, 2 },
1542	{ 2, 3, 0, 1 },
1543	{ 1, 2, 3, 0 },
1544	{ 0, 3, 2, 1 },
1545	{ 1, 0, 3, 2 },
1546	{ 2, 1, 0, 3 },
1547	{ 3, 2, 1, 0 },
1548};
1549
1550static int dsi_host_parse_lane_data(struct msm_dsi_host *msm_host,
1551				    struct device_node *ep)
1552{
1553	struct device *dev = &msm_host->pdev->dev;
1554	struct property *prop;
1555	u32 lane_map[4];
1556	int ret, i, len, num_lanes;
1557
1558	prop = of_find_property(ep, "qcom,data-lane-map", &len);
1559	if (!prop) {
1560		dev_dbg(dev, "failed to find data lane mapping\n");
1561		return -EINVAL;
 
1562	}
1563
1564	num_lanes = len / sizeof(u32);
1565
1566	if (num_lanes < 1 || num_lanes > 4) {
1567		dev_err(dev, "bad number of data lanes\n");
1568		return -EINVAL;
1569	}
1570
1571	msm_host->num_data_lanes = num_lanes;
1572
1573	ret = of_property_read_u32_array(ep, "qcom,data-lane-map", lane_map,
1574					 num_lanes);
1575	if (ret) {
1576		dev_err(dev, "failed to read lane data\n");
1577		return ret;
1578	}
1579
1580	/*
1581	 * compare DT specified physical-logical lane mappings with the ones
1582	 * supported by hardware
1583	 */
1584	for (i = 0; i < ARRAY_SIZE(supported_data_lane_swaps); i++) {
1585		const int *swap = supported_data_lane_swaps[i];
1586		int j;
1587
 
 
 
 
 
 
 
1588		for (j = 0; j < num_lanes; j++) {
1589			if (swap[j] != lane_map[j])
 
 
 
 
1590				break;
1591		}
1592
1593		if (j == num_lanes) {
1594			msm_host->dlane_swap = i;
1595			return 0;
1596		}
1597	}
1598
1599	return -EINVAL;
1600}
1601
1602static int dsi_host_parse_dt(struct msm_dsi_host *msm_host)
1603{
1604	struct device *dev = &msm_host->pdev->dev;
1605	struct device_node *np = dev->of_node;
1606	struct device_node *endpoint, *device_node;
1607	int ret;
1608
1609	ret = of_property_read_u32(np, "qcom,dsi-host-index", &msm_host->id);
1610	if (ret) {
1611		dev_err(dev, "%s: host index not specified, ret=%d\n",
1612			__func__, ret);
1613		return ret;
1614	}
1615
1616	/*
1617	 * Get the first endpoint node. In our case, dsi has one output port
1618	 * to which the panel is connected. Don't return an error if a port
1619	 * isn't defined. It's possible that there is nothing connected to
1620	 * the dsi output.
1621	 */
1622	endpoint = of_graph_get_next_endpoint(np, NULL);
1623	if (!endpoint) {
1624		dev_dbg(dev, "%s: no endpoint\n", __func__);
1625		return 0;
1626	}
1627
1628	ret = dsi_host_parse_lane_data(msm_host, endpoint);
1629	if (ret) {
1630		dev_err(dev, "%s: invalid lane configuration %d\n",
1631			__func__, ret);
1632		goto err;
1633	}
1634
1635	/* Get panel node from the output port's endpoint data */
1636	device_node = of_graph_get_remote_port_parent(endpoint);
1637	if (!device_node) {
1638		dev_err(dev, "%s: no valid device\n", __func__);
1639		ret = -ENODEV;
1640		goto err;
1641	}
1642
1643	msm_host->device_node = device_node;
1644
1645	if (of_property_read_bool(np, "syscon-sfpb")) {
1646		msm_host->sfpb = syscon_regmap_lookup_by_phandle(np,
1647					"syscon-sfpb");
1648		if (IS_ERR(msm_host->sfpb)) {
1649			dev_err(dev, "%s: failed to get sfpb regmap\n",
1650				__func__);
1651			ret = PTR_ERR(msm_host->sfpb);
1652		}
1653	}
1654
1655	of_node_put(device_node);
1656
1657err:
1658	of_node_put(endpoint);
1659
1660	return ret;
1661}
1662
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1663int msm_dsi_host_init(struct msm_dsi *msm_dsi)
1664{
1665	struct msm_dsi_host *msm_host = NULL;
1666	struct platform_device *pdev = msm_dsi->pdev;
1667	int ret;
1668
1669	msm_host = devm_kzalloc(&pdev->dev, sizeof(*msm_host), GFP_KERNEL);
1670	if (!msm_host) {
1671		pr_err("%s: FAILED: cannot alloc dsi host\n",
1672		       __func__);
1673		ret = -ENOMEM;
1674		goto fail;
1675	}
1676
1677	msm_host->pdev = pdev;
 
1678
1679	ret = dsi_host_parse_dt(msm_host);
1680	if (ret) {
1681		pr_err("%s: failed to parse dt\n", __func__);
1682		goto fail;
1683	}
1684
1685	msm_host->ctrl_base = msm_ioremap(pdev, "dsi_ctrl", "DSI CTRL");
1686	if (IS_ERR(msm_host->ctrl_base)) {
1687		pr_err("%s: unable to map Dsi ctrl base\n", __func__);
1688		ret = PTR_ERR(msm_host->ctrl_base);
1689		goto fail;
1690	}
1691
 
 
1692	msm_host->cfg_hnd = dsi_get_config(msm_host);
1693	if (!msm_host->cfg_hnd) {
1694		ret = -EINVAL;
1695		pr_err("%s: get config failed\n", __func__);
1696		goto fail;
1697	}
1698
 
 
 
 
 
 
 
1699	/* fixup base address by io offset */
1700	msm_host->ctrl_base += msm_host->cfg_hnd->cfg->io_offset;
1701
1702	ret = dsi_regulator_init(msm_host);
1703	if (ret) {
1704		pr_err("%s: regulator init failed\n", __func__);
1705		goto fail;
1706	}
1707
1708	ret = dsi_clk_init(msm_host);
1709	if (ret) {
1710		pr_err("%s: unable to initialize dsi clks\n", __func__);
1711		goto fail;
1712	}
1713
1714	msm_host->rx_buf = devm_kzalloc(&pdev->dev, SZ_4K, GFP_KERNEL);
1715	if (!msm_host->rx_buf) {
 
1716		pr_err("%s: alloc rx temp buf failed\n", __func__);
1717		goto fail;
1718	}
1719
1720	init_completion(&msm_host->dma_comp);
1721	init_completion(&msm_host->video_comp);
1722	mutex_init(&msm_host->dev_mutex);
1723	mutex_init(&msm_host->cmd_mutex);
1724	mutex_init(&msm_host->clk_mutex);
1725	spin_lock_init(&msm_host->intr_lock);
1726
1727	/* setup workqueue */
1728	msm_host->workqueue = alloc_ordered_workqueue("dsi_drm_work", 0);
1729	INIT_WORK(&msm_host->err_work, dsi_err_worker);
 
1730
1731	msm_dsi->host = &msm_host->base;
1732	msm_dsi->id = msm_host->id;
1733
1734	DBG("Dsi Host %d initialized", msm_host->id);
1735	return 0;
1736
1737fail:
1738	return ret;
1739}
1740
1741void msm_dsi_host_destroy(struct mipi_dsi_host *host)
1742{
1743	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
1744
1745	DBG("");
1746	dsi_tx_buf_free(msm_host);
1747	if (msm_host->workqueue) {
1748		flush_workqueue(msm_host->workqueue);
1749		destroy_workqueue(msm_host->workqueue);
1750		msm_host->workqueue = NULL;
1751	}
1752
1753	mutex_destroy(&msm_host->clk_mutex);
1754	mutex_destroy(&msm_host->cmd_mutex);
1755	mutex_destroy(&msm_host->dev_mutex);
 
 
1756}
1757
1758int msm_dsi_host_modeset_init(struct mipi_dsi_host *host,
1759					struct drm_device *dev)
1760{
1761	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
1762	struct platform_device *pdev = msm_host->pdev;
1763	int ret;
1764
1765	msm_host->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
1766	if (msm_host->irq < 0) {
1767		ret = msm_host->irq;
1768		dev_err(dev->dev, "failed to get irq: %d\n", ret);
1769		return ret;
1770	}
1771
1772	ret = devm_request_irq(&pdev->dev, msm_host->irq,
1773			dsi_host_irq, IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
1774			"dsi_isr", msm_host);
1775	if (ret < 0) {
1776		dev_err(&pdev->dev, "failed to request IRQ%u: %d\n",
1777				msm_host->irq, ret);
1778		return ret;
1779	}
1780
1781	msm_host->dev = dev;
1782	ret = dsi_tx_buf_alloc(msm_host, SZ_4K);
1783	if (ret) {
1784		pr_err("%s: alloc tx gem obj failed, %d\n", __func__, ret);
1785		return ret;
1786	}
1787
1788	return 0;
1789}
1790
1791int msm_dsi_host_register(struct mipi_dsi_host *host, bool check_defer)
1792{
1793	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
1794	int ret;
1795
1796	/* Register mipi dsi host */
1797	if (!msm_host->registered) {
1798		host->dev = &msm_host->pdev->dev;
1799		host->ops = &dsi_host_ops;
1800		ret = mipi_dsi_host_register(host);
1801		if (ret)
1802			return ret;
1803
1804		msm_host->registered = true;
1805
1806		/* If the panel driver has not been probed after host register,
1807		 * we should defer the host's probe.
1808		 * It makes sure panel is connected when fbcon detects
1809		 * connector status and gets the proper display mode to
1810		 * create framebuffer.
1811		 * Don't try to defer if there is nothing connected to the dsi
1812		 * output
1813		 */
1814		if (check_defer && msm_host->device_node) {
1815			if (!of_drm_find_panel(msm_host->device_node))
1816				if (!of_drm_find_bridge(msm_host->device_node))
1817					return -EPROBE_DEFER;
1818		}
1819	}
1820
1821	return 0;
1822}
1823
1824void msm_dsi_host_unregister(struct mipi_dsi_host *host)
1825{
1826	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
1827
1828	if (msm_host->registered) {
1829		mipi_dsi_host_unregister(host);
1830		host->dev = NULL;
1831		host->ops = NULL;
1832		msm_host->registered = false;
1833	}
1834}
1835
1836int msm_dsi_host_xfer_prepare(struct mipi_dsi_host *host,
1837				const struct mipi_dsi_msg *msg)
1838{
1839	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
1840
1841	/* TODO: make sure dsi_cmd_mdp is idle.
1842	 * Since DSI6G v1.2.0, we can set DSI_TRIG_CTRL.BLOCK_DMA_WITHIN_FRAME
1843	 * to ask H/W to wait until cmd mdp is idle. S/W wait is not needed.
1844	 * How to handle the old versions? Wait for mdp cmd done?
1845	 */
1846
1847	/*
1848	 * mdss interrupt is generated in mdp core clock domain
1849	 * mdp clock need to be enabled to receive dsi interrupt
1850	 */
1851	dsi_clk_ctrl(msm_host, 1);
 
1852
1853	/* TODO: vote for bus bandwidth */
1854
1855	if (!(msg->flags & MIPI_DSI_MSG_USE_LPM))
1856		dsi_set_tx_power_mode(0, msm_host);
1857
1858	msm_host->dma_cmd_ctrl_restore = dsi_read(msm_host, REG_DSI_CTRL);
1859	dsi_write(msm_host, REG_DSI_CTRL,
1860		msm_host->dma_cmd_ctrl_restore |
1861		DSI_CTRL_CMD_MODE_EN |
1862		DSI_CTRL_ENABLE);
1863	dsi_intr_ctrl(msm_host, DSI_IRQ_MASK_CMD_DMA_DONE, 1);
1864
1865	return 0;
1866}
1867
1868void msm_dsi_host_xfer_restore(struct mipi_dsi_host *host,
1869				const struct mipi_dsi_msg *msg)
1870{
1871	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
1872
1873	dsi_intr_ctrl(msm_host, DSI_IRQ_MASK_CMD_DMA_DONE, 0);
1874	dsi_write(msm_host, REG_DSI_CTRL, msm_host->dma_cmd_ctrl_restore);
1875
1876	if (!(msg->flags & MIPI_DSI_MSG_USE_LPM))
1877		dsi_set_tx_power_mode(1, msm_host);
1878
1879	/* TODO: unvote for bus bandwidth */
1880
1881	dsi_clk_ctrl(msm_host, 0);
 
1882}
1883
1884int msm_dsi_host_cmd_tx(struct mipi_dsi_host *host,
1885				const struct mipi_dsi_msg *msg)
1886{
1887	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
1888
1889	return dsi_cmds2buf_tx(msm_host, msg);
1890}
1891
1892int msm_dsi_host_cmd_rx(struct mipi_dsi_host *host,
1893				const struct mipi_dsi_msg *msg)
1894{
1895	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
1896	const struct msm_dsi_cfg_handler *cfg_hnd = msm_host->cfg_hnd;
1897	int data_byte, rx_byte, dlen, end;
1898	int short_response, diff, pkt_size, ret = 0;
1899	char cmd;
1900	int rlen = msg->rx_len;
1901	u8 *buf;
1902
1903	if (rlen <= 2) {
1904		short_response = 1;
1905		pkt_size = rlen;
1906		rx_byte = 4;
1907	} else {
1908		short_response = 0;
1909		data_byte = 10;	/* first read */
1910		if (rlen < data_byte)
1911			pkt_size = rlen;
1912		else
1913			pkt_size = data_byte;
1914		rx_byte = data_byte + 6; /* 4 header + 2 crc */
1915	}
1916
1917	buf = msm_host->rx_buf;
1918	end = 0;
1919	while (!end) {
1920		u8 tx[2] = {pkt_size & 0xff, pkt_size >> 8};
1921		struct mipi_dsi_msg max_pkt_size_msg = {
1922			.channel = msg->channel,
1923			.type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE,
1924			.tx_len = 2,
1925			.tx_buf = tx,
1926		};
1927
1928		DBG("rlen=%d pkt_size=%d rx_byte=%d",
1929			rlen, pkt_size, rx_byte);
1930
1931		ret = dsi_cmds2buf_tx(msm_host, &max_pkt_size_msg);
1932		if (ret < 2) {
1933			pr_err("%s: Set max pkt size failed, %d\n",
1934				__func__, ret);
1935			return -EINVAL;
1936		}
1937
1938		if ((cfg_hnd->major == MSM_DSI_VER_MAJOR_6G) &&
1939			(cfg_hnd->minor >= MSM_DSI_6G_VER_MINOR_V1_1)) {
1940			/* Clear the RDBK_DATA registers */
1941			dsi_write(msm_host, REG_DSI_RDBK_DATA_CTRL,
1942					DSI_RDBK_DATA_CTRL_CLR);
1943			wmb(); /* make sure the RDBK registers are cleared */
1944			dsi_write(msm_host, REG_DSI_RDBK_DATA_CTRL, 0);
1945			wmb(); /* release cleared status before transfer */
1946		}
1947
1948		ret = dsi_cmds2buf_tx(msm_host, msg);
1949		if (ret < msg->tx_len) {
1950			pr_err("%s: Read cmd Tx failed, %d\n", __func__, ret);
1951			return ret;
1952		}
1953
1954		/*
1955		 * once cmd_dma_done interrupt received,
1956		 * return data from client is ready and stored
1957		 * at RDBK_DATA register already
1958		 * since rx fifo is 16 bytes, dcs header is kept at first loop,
1959		 * after that dcs header lost during shift into registers
1960		 */
1961		dlen = dsi_cmd_dma_rx(msm_host, buf, rx_byte, pkt_size);
1962
1963		if (dlen <= 0)
1964			return 0;
1965
1966		if (short_response)
1967			break;
1968
1969		if (rlen <= data_byte) {
1970			diff = data_byte - rlen;
1971			end = 1;
1972		} else {
1973			diff = 0;
1974			rlen -= data_byte;
1975		}
1976
1977		if (!end) {
1978			dlen -= 2; /* 2 crc */
1979			dlen -= diff;
1980			buf += dlen;	/* next start position */
1981			data_byte = 14;	/* NOT first read */
1982			if (rlen < data_byte)
1983				pkt_size += rlen;
1984			else
1985				pkt_size += data_byte;
1986			DBG("buf=%p dlen=%d diff=%d", buf, dlen, diff);
1987		}
1988	}
1989
1990	/*
1991	 * For single Long read, if the requested rlen < 10,
1992	 * we need to shift the start position of rx
1993	 * data buffer to skip the bytes which are not
1994	 * updated.
1995	 */
1996	if (pkt_size < 10 && !short_response)
1997		buf = msm_host->rx_buf + (10 - rlen);
1998	else
1999		buf = msm_host->rx_buf;
2000
2001	cmd = buf[0];
2002	switch (cmd) {
2003	case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT:
2004		pr_err("%s: rx ACK_ERR_PACLAGE\n", __func__);
2005		ret = 0;
2006		break;
2007	case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_1BYTE:
2008	case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE:
2009		ret = dsi_short_read1_resp(buf, msg);
2010		break;
2011	case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_2BYTE:
2012	case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE:
2013		ret = dsi_short_read2_resp(buf, msg);
2014		break;
2015	case MIPI_DSI_RX_GENERIC_LONG_READ_RESPONSE:
2016	case MIPI_DSI_RX_DCS_LONG_READ_RESPONSE:
2017		ret = dsi_long_read_resp(buf, msg);
2018		break;
2019	default:
2020		pr_warn("%s:Invalid response cmd\n", __func__);
2021		ret = 0;
2022	}
2023
2024	return ret;
2025}
2026
2027void msm_dsi_host_cmd_xfer_commit(struct mipi_dsi_host *host, u32 dma_base,
2028				  u32 len)
2029{
2030	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
2031
2032	dsi_write(msm_host, REG_DSI_DMA_BASE, dma_base);
2033	dsi_write(msm_host, REG_DSI_DMA_LEN, len);
2034	dsi_write(msm_host, REG_DSI_TRIG_DMA, 1);
2035
2036	/* Make sure trigger happens */
2037	wmb();
2038}
2039
2040int msm_dsi_host_set_src_pll(struct mipi_dsi_host *host,
2041	struct msm_dsi_pll *src_pll)
2042{
2043	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
2044	const struct msm_dsi_cfg_handler *cfg_hnd = msm_host->cfg_hnd;
2045	struct clk *byte_clk_provider, *pixel_clk_provider;
2046	int ret;
2047
2048	ret = msm_dsi_pll_get_clk_provider(src_pll,
2049				&byte_clk_provider, &pixel_clk_provider);
2050	if (ret) {
2051		pr_info("%s: can't get provider from pll, don't set parent\n",
2052			__func__);
2053		return 0;
2054	}
2055
2056	ret = clk_set_parent(msm_host->byte_clk_src, byte_clk_provider);
2057	if (ret) {
2058		pr_err("%s: can't set parent to byte_clk_src. ret=%d\n",
2059			__func__, ret);
2060		goto exit;
2061	}
2062
2063	ret = clk_set_parent(msm_host->pixel_clk_src, pixel_clk_provider);
2064	if (ret) {
2065		pr_err("%s: can't set parent to pixel_clk_src. ret=%d\n",
2066			__func__, ret);
2067		goto exit;
2068	}
2069
2070	if (cfg_hnd->major == MSM_DSI_VER_MAJOR_V2) {
2071		ret = clk_set_parent(msm_host->dsi_clk_src, pixel_clk_provider);
2072		if (ret) {
2073			pr_err("%s: can't set parent to dsi_clk_src. ret=%d\n",
2074				__func__, ret);
2075			goto exit;
2076		}
2077
2078		ret = clk_set_parent(msm_host->esc_clk_src, byte_clk_provider);
2079		if (ret) {
2080			pr_err("%s: can't set parent to esc_clk_src. ret=%d\n",
2081				__func__, ret);
2082			goto exit;
2083		}
2084	}
2085
2086exit:
2087	return ret;
2088}
2089
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2090int msm_dsi_host_enable(struct mipi_dsi_host *host)
2091{
2092	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
2093
2094	dsi_op_mode_config(msm_host,
2095		!!(msm_host->mode_flags & MIPI_DSI_MODE_VIDEO), true);
2096
2097	/* TODO: clock should be turned off for command mode,
2098	 * and only turned on before MDP START.
2099	 * This part of code should be enabled once mdp driver support it.
2100	 */
2101	/* if (msm_panel->mode == MSM_DSI_CMD_MODE)
2102		dsi_clk_ctrl(msm_host, 0); */
2103
 
 
 
2104	return 0;
2105}
2106
2107int msm_dsi_host_disable(struct mipi_dsi_host *host)
2108{
2109	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
2110
 
2111	dsi_op_mode_config(msm_host,
2112		!!(msm_host->mode_flags & MIPI_DSI_MODE_VIDEO), false);
2113
2114	/* Since we have disabled INTF, the video engine won't stop so that
2115	 * the cmd engine will be blocked.
2116	 * Reset to disable video engine so that we can send off cmd.
2117	 */
2118	dsi_sw_reset(msm_host);
2119
2120	return 0;
2121}
2122
2123static void msm_dsi_sfpb_config(struct msm_dsi_host *msm_host, bool enable)
2124{
2125	enum sfpb_ahb_arb_master_port_en en;
2126
2127	if (!msm_host->sfpb)
2128		return;
2129
2130	en = enable ? SFPB_MASTER_PORT_ENABLE : SFPB_MASTER_PORT_DISABLE;
2131
2132	regmap_update_bits(msm_host->sfpb, REG_SFPB_GPREG,
2133			SFPB_GPREG_MASTER_PORT_EN__MASK,
2134			SFPB_GPREG_MASTER_PORT_EN(en));
2135}
2136
2137int msm_dsi_host_power_on(struct mipi_dsi_host *host)
 
2138{
2139	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
2140	u32 clk_pre = 0, clk_post = 0;
2141	int ret = 0;
2142
2143	mutex_lock(&msm_host->dev_mutex);
2144	if (msm_host->power_on) {
2145		DBG("dsi host already on");
2146		goto unlock_ret;
2147	}
2148
2149	msm_dsi_sfpb_config(msm_host, true);
2150
2151	ret = dsi_calc_clk_rate(msm_host);
2152	if (ret) {
2153		pr_err("%s: unable to calc clk rate, %d\n", __func__, ret);
2154		goto unlock_ret;
2155	}
2156
2157	ret = dsi_host_regulator_enable(msm_host);
2158	if (ret) {
2159		pr_err("%s:Failed to enable vregs.ret=%d\n",
2160			__func__, ret);
2161		goto unlock_ret;
2162	}
2163
2164	ret = dsi_bus_clk_enable(msm_host);
 
2165	if (ret) {
2166		pr_err("%s: failed to enable bus clocks, %d\n", __func__, ret);
2167		goto fail_disable_reg;
2168	}
2169
2170	dsi_phy_sw_reset(msm_host);
2171	ret = msm_dsi_manager_phy_enable(msm_host->id,
2172					msm_host->byte_clk_rate * 8,
2173					msm_host->esc_clk_rate,
2174					&clk_pre, &clk_post);
2175	dsi_bus_clk_disable(msm_host);
2176	if (ret) {
2177		pr_err("%s: failed to enable phy, %d\n", __func__, ret);
2178		goto fail_disable_reg;
2179	}
2180
2181	ret = dsi_clk_ctrl(msm_host, 1);
2182	if (ret) {
2183		pr_err("%s: failed to enable clocks. ret=%d\n", __func__, ret);
2184		goto fail_disable_reg;
2185	}
2186
2187	ret = pinctrl_pm_select_default_state(&msm_host->pdev->dev);
2188	if (ret) {
2189		pr_err("%s: failed to set pinctrl default state, %d\n",
2190			__func__, ret);
2191		goto fail_disable_clk;
2192	}
2193
2194	dsi_timing_setup(msm_host);
2195	dsi_sw_reset(msm_host);
2196	dsi_ctrl_config(msm_host, true, clk_pre, clk_post);
2197
2198	if (msm_host->disp_en_gpio)
2199		gpiod_set_value(msm_host->disp_en_gpio, 1);
2200
2201	msm_host->power_on = true;
2202	mutex_unlock(&msm_host->dev_mutex);
2203
2204	return 0;
2205
2206fail_disable_clk:
2207	dsi_clk_ctrl(msm_host, 0);
 
2208fail_disable_reg:
2209	dsi_host_regulator_disable(msm_host);
2210unlock_ret:
2211	mutex_unlock(&msm_host->dev_mutex);
2212	return ret;
2213}
2214
2215int msm_dsi_host_power_off(struct mipi_dsi_host *host)
2216{
2217	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
2218
2219	mutex_lock(&msm_host->dev_mutex);
2220	if (!msm_host->power_on) {
2221		DBG("dsi host already off");
2222		goto unlock_ret;
2223	}
2224
2225	dsi_ctrl_config(msm_host, false, 0, 0);
2226
2227	if (msm_host->disp_en_gpio)
2228		gpiod_set_value(msm_host->disp_en_gpio, 0);
2229
2230	pinctrl_pm_select_sleep_state(&msm_host->pdev->dev);
2231
2232	msm_dsi_manager_phy_disable(msm_host->id);
2233
2234	dsi_clk_ctrl(msm_host, 0);
2235
2236	dsi_host_regulator_disable(msm_host);
2237
2238	msm_dsi_sfpb_config(msm_host, false);
2239
2240	DBG("-");
2241
2242	msm_host->power_on = false;
2243
2244unlock_ret:
2245	mutex_unlock(&msm_host->dev_mutex);
2246	return 0;
2247}
2248
2249int msm_dsi_host_set_display_mode(struct mipi_dsi_host *host,
2250					struct drm_display_mode *mode)
2251{
2252	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
2253
2254	if (msm_host->mode) {
2255		drm_mode_destroy(msm_host->dev, msm_host->mode);
2256		msm_host->mode = NULL;
2257	}
2258
2259	msm_host->mode = drm_mode_duplicate(msm_host->dev, mode);
2260	if (IS_ERR(msm_host->mode)) {
2261		pr_err("%s: cannot duplicate mode\n", __func__);
2262		return PTR_ERR(msm_host->mode);
2263	}
2264
2265	return 0;
2266}
2267
2268struct drm_panel *msm_dsi_host_get_panel(struct mipi_dsi_host *host,
2269				unsigned long *panel_flags)
2270{
2271	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
2272	struct drm_panel *panel;
2273
2274	panel = of_drm_find_panel(msm_host->device_node);
2275	if (panel_flags)
2276			*panel_flags = msm_host->mode_flags;
2277
2278	return panel;
2279}
2280
2281struct drm_bridge *msm_dsi_host_get_bridge(struct mipi_dsi_host *host)
2282{
2283	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
2284
2285	return of_drm_find_bridge(msm_host->device_node);
2286}