1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) STMicroelectronics SA 2017
  4 *
  5 * Authors: Philippe Cornu <philippe.cornu@st.com>
  6 *          Yannick Fertre <yannick.fertre@st.com>
  7 */
  8
  9#include <linux/clk.h>
 10#include <linux/clk-provider.h>
 11#include <linux/iopoll.h>
 12#include <linux/kernel.h>
 13#include <linux/mod_devicetable.h>
 14#include <linux/module.h>
 15#include <linux/platform_device.h>
 16#include <linux/pm_runtime.h>
 17#include <linux/regulator/consumer.h>
 18
 19#include <video/mipi_display.h>
 20
 21#include <drm/bridge/dw_mipi_dsi.h>
 22#include <drm/drm_mipi_dsi.h>
 23#include <drm/drm_print.h>
 
 24
 25#define HWVER_130			0x31333000	/* IP version 1.30 */
 26#define HWVER_131			0x31333100	/* IP version 1.31 */
 27
 28/* DSI digital registers & bit definitions */
 29#define DSI_VERSION			0x00
 30#define VERSION				GENMASK(31, 8)
 31
 32/* DSI wrapper registers & bit definitions */
 33/* Note: registers are named as in the Reference Manual */
 34#define DSI_WCFGR	0x0400		/* Wrapper ConFiGuration Reg */
 35#define WCFGR_DSIM	BIT(0)		/* DSI Mode */
 36#define WCFGR_COLMUX	GENMASK(3, 1)	/* COLor MUltipleXing */
 37
 38#define DSI_WCR		0x0404		/* Wrapper Control Reg */
 39#define WCR_DSIEN	BIT(3)		/* DSI ENable */
 40
 41#define DSI_WISR	0x040C		/* Wrapper Interrupt and Status Reg */
 42#define WISR_PLLLS	BIT(8)		/* PLL Lock Status */
 43#define WISR_RRS	BIT(12)		/* Regulator Ready Status */
 44
 45#define DSI_WPCR0	0x0418		/* Wrapper Phy Conf Reg 0 */
 46#define WPCR0_UIX4	GENMASK(5, 0)	/* Unit Interval X 4 */
 47#define WPCR0_TDDL	BIT(16)		/* Turn Disable Data Lanes */
 48
 49#define DSI_WRPCR	0x0430		/* Wrapper Regulator & Pll Ctrl Reg */
 50#define WRPCR_PLLEN	BIT(0)		/* PLL ENable */
 51#define WRPCR_NDIV	GENMASK(8, 2)	/* pll loop DIVision Factor */
 52#define WRPCR_IDF	GENMASK(14, 11)	/* pll Input Division Factor */
 53#define WRPCR_ODF	GENMASK(17, 16)	/* pll Output Division Factor */
 54#define WRPCR_REGEN	BIT(24)		/* REGulator ENable */
 55#define WRPCR_BGREN	BIT(28)		/* BandGap Reference ENable */
 56#define IDF_MIN		1
 57#define IDF_MAX		7
 58#define NDIV_MIN	10
 59#define NDIV_MAX	125
 60#define ODF_MIN		1
 61#define ODF_MAX		8
 62
 63/* dsi color format coding according to the datasheet */
 64enum dsi_color {
 65	DSI_RGB565_CONF1,
 66	DSI_RGB565_CONF2,
 67	DSI_RGB565_CONF3,
 68	DSI_RGB666_CONF1,
 69	DSI_RGB666_CONF2,
 70	DSI_RGB888,
 71};
 72
 73#define LANE_MIN_KBPS	31250
 74#define LANE_MAX_KBPS	500000
 75
 76/* Sleep & timeout for regulator on/off, pll lock/unlock & fifo empty */
 77#define SLEEP_US	1000
 78#define TIMEOUT_US	200000
 79
 80struct dw_mipi_dsi_stm {
 81	void __iomem *base;
 82	struct device *dev;
 83	struct clk *pllref_clk;
 84	struct clk *pclk;
 85	struct clk_hw txbyte_clk;
 86	struct dw_mipi_dsi *dsi;
 87	struct dw_mipi_dsi_plat_data pdata;
 88	u32 hw_version;
 89	int lane_min_kbps;
 90	int lane_max_kbps;
 91	struct regulator *vdd_supply;
 92};
 93
 94static inline void dsi_write(struct dw_mipi_dsi_stm *dsi, u32 reg, u32 val)
 95{
 96	writel(val, dsi->base + reg);
 97}
 98
 99static inline u32 dsi_read(struct dw_mipi_dsi_stm *dsi, u32 reg)
100{
101	return readl(dsi->base + reg);
102}
103
104static inline void dsi_set(struct dw_mipi_dsi_stm *dsi, u32 reg, u32 mask)
105{
106	dsi_write(dsi, reg, dsi_read(dsi, reg) | mask);
107}
108
109static inline void dsi_clear(struct dw_mipi_dsi_stm *dsi, u32 reg, u32 mask)
110{
111	dsi_write(dsi, reg, dsi_read(dsi, reg) & ~mask);
112}
113
114static inline void dsi_update_bits(struct dw_mipi_dsi_stm *dsi, u32 reg,
115				   u32 mask, u32 val)
116{
117	dsi_write(dsi, reg, (dsi_read(dsi, reg) & ~mask) | val);
118}
119
120static enum dsi_color dsi_color_from_mipi(enum mipi_dsi_pixel_format fmt)
121{
122	switch (fmt) {
123	case MIPI_DSI_FMT_RGB888:
124		return DSI_RGB888;
125	case MIPI_DSI_FMT_RGB666:
126		return DSI_RGB666_CONF2;
127	case MIPI_DSI_FMT_RGB666_PACKED:
128		return DSI_RGB666_CONF1;
129	case MIPI_DSI_FMT_RGB565:
130		return DSI_RGB565_CONF1;
131	default:
132		DRM_DEBUG_DRIVER("MIPI color invalid, so we use rgb888\n");
133	}
134	return DSI_RGB888;
135}
136
137static int dsi_pll_get_clkout_khz(int clkin_khz, int idf, int ndiv, int odf)
138{
139	int divisor = idf * odf;
140
141	/* prevent from division by 0 */
142	if (!divisor)
143		return 0;
144
145	return DIV_ROUND_CLOSEST(clkin_khz * ndiv, divisor);
146}
147
148static int dsi_pll_get_params(struct dw_mipi_dsi_stm *dsi,
149			      int clkin_khz, int clkout_khz,
150			      int *idf, int *ndiv, int *odf)
151{
152	int i, o, n, n_min, n_max;
153	int fvco_min, fvco_max, delta, best_delta; /* all in khz */
154
155	/* Early checks preventing division by 0 & odd results */
156	if (clkin_khz <= 0 || clkout_khz <= 0)
157		return -EINVAL;
158
159	fvco_min = dsi->lane_min_kbps * 2 * ODF_MAX;
160	fvco_max = dsi->lane_max_kbps * 2 * ODF_MIN;
161
162	best_delta = 1000000; /* big started value (1000000khz) */
163
164	for (i = IDF_MIN; i <= IDF_MAX; i++) {
165		/* Compute ndiv range according to Fvco */
166		n_min = ((fvco_min * i) / (2 * clkin_khz)) + 1;
167		n_max = (fvco_max * i) / (2 * clkin_khz);
168
169		/* No need to continue idf loop if we reach ndiv max */
170		if (n_min >= NDIV_MAX)
171			break;
172
173		/* Clamp ndiv to valid values */
174		if (n_min < NDIV_MIN)
175			n_min = NDIV_MIN;
176		if (n_max > NDIV_MAX)
177			n_max = NDIV_MAX;
178
179		for (o = ODF_MIN; o <= ODF_MAX; o *= 2) {
180			n = DIV_ROUND_CLOSEST(i * o * clkout_khz, clkin_khz);
181			/* Check ndiv according to vco range */
182			if (n < n_min || n > n_max)
183				continue;
184			/* Check if new delta is better & saves parameters */
185			delta = dsi_pll_get_clkout_khz(clkin_khz, i, n, o) -
186				clkout_khz;
187			if (delta < 0)
188				delta = -delta;
189			if (delta < best_delta) {
190				*idf = i;
191				*ndiv = n;
192				*odf = o;
193				best_delta = delta;
194			}
195			/* fast return in case of "perfect result" */
196			if (!delta)
197				return 0;
198		}
199	}
200
201	return 0;
202}
203
204#define clk_to_dw_mipi_dsi_stm(clk) \
205	container_of(clk, struct dw_mipi_dsi_stm, txbyte_clk)
206
207static void dw_mipi_dsi_clk_disable(struct clk_hw *clk)
208{
209	struct dw_mipi_dsi_stm *dsi = clk_to_dw_mipi_dsi_stm(clk);
210
211	DRM_DEBUG_DRIVER("\n");
212
213	/* Disable the DSI PLL */
214	dsi_clear(dsi, DSI_WRPCR, WRPCR_PLLEN);
215
216	/* Disable the regulator */
217	dsi_clear(dsi, DSI_WRPCR, WRPCR_REGEN | WRPCR_BGREN);
218}
219
220static int dw_mipi_dsi_clk_enable(struct clk_hw *clk)
221{
222	struct dw_mipi_dsi_stm *dsi = clk_to_dw_mipi_dsi_stm(clk);
223	u32 val;
224	int ret;
225
226	DRM_DEBUG_DRIVER("\n");
227
228	/* Enable the regulator */
229	dsi_set(dsi, DSI_WRPCR, WRPCR_REGEN | WRPCR_BGREN);
230	ret = readl_poll_timeout_atomic(dsi->base + DSI_WISR, val, val & WISR_RRS,
231					SLEEP_US, TIMEOUT_US);
232	if (ret)
233		DRM_DEBUG_DRIVER("!TIMEOUT! waiting REGU, let's continue\n");
234
235	/* Enable the DSI PLL & wait for its lock */
236	dsi_set(dsi, DSI_WRPCR, WRPCR_PLLEN);
237	ret = readl_poll_timeout_atomic(dsi->base + DSI_WISR, val, val & WISR_PLLLS,
238					SLEEP_US, TIMEOUT_US);
239	if (ret)
240		DRM_DEBUG_DRIVER("!TIMEOUT! waiting PLL, let's continue\n");
241
242	return 0;
243}
244
245static int dw_mipi_dsi_clk_is_enabled(struct clk_hw *hw)
246{
247	struct dw_mipi_dsi_stm *dsi = clk_to_dw_mipi_dsi_stm(hw);
248
249	return dsi_read(dsi, DSI_WRPCR) & WRPCR_PLLEN;
250}
251
252static unsigned long dw_mipi_dsi_clk_recalc_rate(struct clk_hw *hw,
253						 unsigned long parent_rate)
254{
255	struct dw_mipi_dsi_stm *dsi = clk_to_dw_mipi_dsi_stm(hw);
256	unsigned int idf, ndiv, odf, pll_in_khz, pll_out_khz;
257	u32 val;
258
259	DRM_DEBUG_DRIVER("\n");
260
261	pll_in_khz = (unsigned int)(parent_rate / 1000);
262
263	val = dsi_read(dsi, DSI_WRPCR);
264
265	idf = (val & WRPCR_IDF) >> 11;
266	if (!idf)
267		idf = 1;
268	ndiv = (val & WRPCR_NDIV) >> 2;
269	odf = int_pow(2, (val & WRPCR_ODF) >> 16);
270
271	/* Get the adjusted pll out value */
272	pll_out_khz = dsi_pll_get_clkout_khz(pll_in_khz, idf, ndiv, odf);
273
274	return (unsigned long)pll_out_khz * 1000;
275}
276
277static long dw_mipi_dsi_clk_round_rate(struct clk_hw *hw, unsigned long rate,
278				       unsigned long *parent_rate)
279{
280	struct dw_mipi_dsi_stm *dsi = clk_to_dw_mipi_dsi_stm(hw);
281	unsigned int idf, ndiv, odf, pll_in_khz, pll_out_khz;
282	int ret;
283
284	DRM_DEBUG_DRIVER("\n");
285
286	pll_in_khz = (unsigned int)(*parent_rate / 1000);
287
288	/* Compute best pll parameters */
289	idf = 0;
290	ndiv = 0;
291	odf = 0;
292
293	ret = dsi_pll_get_params(dsi, pll_in_khz, rate / 1000,
294				 &idf, &ndiv, &odf);
295	if (ret)
296		DRM_WARN("Warning dsi_pll_get_params(): bad params\n");
297
298	/* Get the adjusted pll out value */
299	pll_out_khz = dsi_pll_get_clkout_khz(pll_in_khz, idf, ndiv, odf);
300
301	return pll_out_khz * 1000;
302}
303
304static int dw_mipi_dsi_clk_set_rate(struct clk_hw *hw, unsigned long rate,
305				    unsigned long parent_rate)
306{
307	struct dw_mipi_dsi_stm *dsi = clk_to_dw_mipi_dsi_stm(hw);
308	unsigned int idf, ndiv, odf, pll_in_khz, pll_out_khz;
309	int ret;
310	u32 val;
311
312	DRM_DEBUG_DRIVER("\n");
313
314	pll_in_khz = (unsigned int)(parent_rate / 1000);
315
316	/* Compute best pll parameters */
317	idf = 0;
318	ndiv = 0;
319	odf = 0;
320
321	ret = dsi_pll_get_params(dsi, pll_in_khz, rate / 1000, &idf, &ndiv, &odf);
322	if (ret)
323		DRM_WARN("Warning dsi_pll_get_params(): bad params\n");
324
325	/* Get the adjusted pll out value */
326	pll_out_khz = dsi_pll_get_clkout_khz(pll_in_khz, idf, ndiv, odf);
327
328	/* Set the PLL division factors */
329	dsi_update_bits(dsi, DSI_WRPCR,	WRPCR_NDIV | WRPCR_IDF | WRPCR_ODF,
330			(ndiv << 2) | (idf << 11) | ((ffs(odf) - 1) << 16));
331
332	/* Compute uix4 & set the bit period in high-speed mode */
333	val = 4000000 / pll_out_khz;
334	dsi_update_bits(dsi, DSI_WPCR0, WPCR0_UIX4, val);
335
336	return 0;
337}
338
339static void dw_mipi_dsi_clk_unregister(void *data)
340{
341	struct dw_mipi_dsi_stm *dsi = data;
342
343	DRM_DEBUG_DRIVER("\n");
344
345	of_clk_del_provider(dsi->dev->of_node);
346	clk_hw_unregister(&dsi->txbyte_clk);
347}
348
349static const struct clk_ops dw_mipi_dsi_stm_clk_ops = {
350	.enable = dw_mipi_dsi_clk_enable,
351	.disable = dw_mipi_dsi_clk_disable,
352	.is_enabled = dw_mipi_dsi_clk_is_enabled,
353	.recalc_rate = dw_mipi_dsi_clk_recalc_rate,
354	.round_rate = dw_mipi_dsi_clk_round_rate,
355	.set_rate = dw_mipi_dsi_clk_set_rate,
356};
357
358static struct clk_init_data cdata_init = {
359	.name = "ck_dsi_phy",
360	.ops = &dw_mipi_dsi_stm_clk_ops,
361	.parent_names = (const char * []) {"ck_hse"},
362	.num_parents = 1,
363};
364
365static int dw_mipi_dsi_clk_register(struct dw_mipi_dsi_stm *dsi,
366				    struct device *dev)
367{
368	struct device_node *node = dev->of_node;
369	int ret;
370
371	DRM_DEBUG_DRIVER("Registering clk\n");
372
373	dsi->txbyte_clk.init = &cdata_init;
374
375	ret = clk_hw_register(dev, &dsi->txbyte_clk);
376	if (ret)
377		return ret;
378
379	ret = of_clk_add_hw_provider(node, of_clk_hw_simple_get,
380				     &dsi->txbyte_clk);
381	if (ret)
382		clk_hw_unregister(&dsi->txbyte_clk);
383
384	return ret;
385}
386
387static int dw_mipi_dsi_phy_init(void *priv_data)
388{
389	struct dw_mipi_dsi_stm *dsi = priv_data;
390	int ret;
391
392	ret = clk_prepare_enable(dsi->txbyte_clk.clk);
393	return ret;
394}
395
396static void dw_mipi_dsi_phy_power_on(void *priv_data)
397{
398	struct dw_mipi_dsi_stm *dsi = priv_data;
399
400	DRM_DEBUG_DRIVER("\n");
401
402	/* Enable the DSI wrapper */
403	dsi_set(dsi, DSI_WCR, WCR_DSIEN);
404}
405
406static void dw_mipi_dsi_phy_power_off(void *priv_data)
407{
408	struct dw_mipi_dsi_stm *dsi = priv_data;
409
410	DRM_DEBUG_DRIVER("\n");
411
412	clk_disable_unprepare(dsi->txbyte_clk.clk);
413
414	/* Disable the DSI wrapper */
415	dsi_clear(dsi, DSI_WCR, WCR_DSIEN);
416}
417
418static int
419dw_mipi_dsi_get_lane_mbps(void *priv_data, const struct drm_display_mode *mode,
420			  unsigned long mode_flags, u32 lanes, u32 format,
421			  unsigned int *lane_mbps)
422{
423	struct dw_mipi_dsi_stm *dsi = priv_data;
424	unsigned int pll_in_khz, pll_out_khz;
425	int ret, bpp;
 
 
 
 
 
 
 
 
 
 
426
427	pll_in_khz = (unsigned int)(clk_get_rate(dsi->pllref_clk) / 1000);
428
429	/* Compute requested pll out */
430	bpp = mipi_dsi_pixel_format_to_bpp(format);
431	pll_out_khz = mode->clock * bpp / lanes;
432
433	/* Add 20% to pll out to be higher than pixel bw (burst mode only) */
434	if (mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
435		pll_out_khz = (pll_out_khz * 12) / 10;
436
437	if (pll_out_khz > dsi->lane_max_kbps) {
438		pll_out_khz = dsi->lane_max_kbps;
439		DRM_WARN("Warning max phy mbps is used\n");
440	}
441	if (pll_out_khz < dsi->lane_min_kbps) {
442		pll_out_khz = dsi->lane_min_kbps;
443		DRM_WARN("Warning min phy mbps is used\n");
444	}
445
446	ret = clk_set_rate((dsi->txbyte_clk.clk), pll_out_khz * 1000);
 
 
 
 
 
447	if (ret)
448		DRM_DEBUG_DRIVER("ERROR Could not set rate of %d to %s clk->name",
449				 pll_out_khz, clk_hw_get_name(&dsi->txbyte_clk));
 
 
 
 
 
 
 
 
 
 
450
451	/* Select video mode by resetting DSIM bit */
452	dsi_clear(dsi, DSI_WCFGR, WCFGR_DSIM);
453
454	/* Select the color coding */
455	dsi_update_bits(dsi, DSI_WCFGR, WCFGR_COLMUX,
456			dsi_color_from_mipi(format) << 1);
457
458	*lane_mbps = pll_out_khz / 1000;
459
460	DRM_DEBUG_DRIVER("pll_in %ukHz pll_out %ukHz lane_mbps %uMHz\n",
461			 pll_in_khz, pll_out_khz, *lane_mbps);
462
463	return 0;
464}
465
466#define DSI_PHY_DELAY(fp, vp, mbps) DIV_ROUND_UP((fp) * (mbps) + 1000 * (vp), 8000)
467
468static int
469dw_mipi_dsi_phy_get_timing(void *priv_data, unsigned int lane_mbps,
470			   struct dw_mipi_dsi_dphy_timing *timing)
471{
472	/*
473	 * From STM32MP157 datasheet, valid for STM32F469, STM32F7x9, STM32H747
474	 * phy_clkhs2lp_time = (272+136*UI)/(8*UI)
475	 * phy_clklp2hs_time = (512+40*UI)/(8*UI)
476	 * phy_hs2lp_time = (192+64*UI)/(8*UI)
477	 * phy_lp2hs_time = (256+32*UI)/(8*UI)
478	 */
479	timing->clk_hs2lp = DSI_PHY_DELAY(272, 136, lane_mbps);
480	timing->clk_lp2hs = DSI_PHY_DELAY(512, 40, lane_mbps);
481	timing->data_hs2lp = DSI_PHY_DELAY(192, 64, lane_mbps);
482	timing->data_lp2hs = DSI_PHY_DELAY(256, 32, lane_mbps);
483
484	return 0;
485}
486
487#define CLK_TOLERANCE_HZ 50
488
489static enum drm_mode_status
490dw_mipi_dsi_stm_mode_valid(void *priv_data,
491			   const struct drm_display_mode *mode,
492			   unsigned long mode_flags, u32 lanes, u32 format)
493{
494	struct dw_mipi_dsi_stm *dsi = priv_data;
495	unsigned int idf, ndiv, odf, pll_in_khz, pll_out_khz;
496	int ret, bpp;
497
498	bpp = mipi_dsi_pixel_format_to_bpp(format);
499	if (bpp < 0)
500		return MODE_BAD;
501
502	/* Compute requested pll out */
503	pll_out_khz = mode->clock * bpp / lanes;
504
505	if (pll_out_khz > dsi->lane_max_kbps)
506		return MODE_CLOCK_HIGH;
507
508	if (mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
509		/* Add 20% to pll out to be higher than pixel bw */
510		pll_out_khz = (pll_out_khz * 12) / 10;
511	} else {
512		if (pll_out_khz < dsi->lane_min_kbps)
513			return MODE_CLOCK_LOW;
514	}
515
516	/* Compute best pll parameters */
517	idf = 0;
518	ndiv = 0;
519	odf = 0;
520	pll_in_khz = clk_get_rate(dsi->pllref_clk) / 1000;
521	ret = dsi_pll_get_params(dsi, pll_in_khz, pll_out_khz, &idf, &ndiv, &odf);
522	if (ret) {
523		DRM_WARN("Warning dsi_pll_get_params(): bad params\n");
524		return MODE_ERROR;
525	}
526
527	if (!(mode_flags & MIPI_DSI_MODE_VIDEO_BURST)) {
528		unsigned int px_clock_hz, target_px_clock_hz, lane_mbps;
529		int dsi_short_packet_size_px, hfp, hsync, hbp, delay_to_lp;
530		struct dw_mipi_dsi_dphy_timing dphy_timing;
531
532		/* Get the adjusted pll out value */
533		pll_out_khz = dsi_pll_get_clkout_khz(pll_in_khz, idf, ndiv, odf);
534
535		px_clock_hz = DIV_ROUND_CLOSEST_ULL(1000ULL * pll_out_khz * lanes, bpp);
536		target_px_clock_hz = mode->clock * 1000;
537		/*
538		 * Filter modes according to the clock value, particularly useful for
539		 * hdmi modes that require precise pixel clocks.
540		 */
541		if (px_clock_hz < target_px_clock_hz - CLK_TOLERANCE_HZ ||
542		    px_clock_hz > target_px_clock_hz + CLK_TOLERANCE_HZ)
543			return MODE_CLOCK_RANGE;
544
545		/* sync packets are codes as DSI short packets (4 bytes) */
546		dsi_short_packet_size_px = DIV_ROUND_UP(4 * BITS_PER_BYTE, bpp);
547
548		hfp = mode->hsync_start - mode->hdisplay;
549		hsync = mode->hsync_end - mode->hsync_start;
550		hbp = mode->htotal - mode->hsync_end;
551
552		/* hsync must be longer than 4 bytes HSS packets */
553		if (hsync < dsi_short_packet_size_px)
554			return MODE_HSYNC_NARROW;
555
556		if (mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
557			/* HBP must be longer than 4 bytes HSE packets */
558			if (hbp < dsi_short_packet_size_px)
559				return MODE_HSYNC_NARROW;
560			hbp -= dsi_short_packet_size_px;
561		} else {
562			/* With sync events HBP extends in the hsync */
563			hbp += hsync - dsi_short_packet_size_px;
564		}
565
566		lane_mbps = pll_out_khz / 1000;
567		ret = dw_mipi_dsi_phy_get_timing(priv_data, lane_mbps, &dphy_timing);
568		if (ret)
569			return MODE_ERROR;
570		/*
571		 * In non-burst mode DSI has to enter in LP during HFP
572		 * (horizontal front porch) or HBP (horizontal back porch) to
573		 * resync with LTDC pixel clock.
574		 */
575		delay_to_lp = DIV_ROUND_UP((dphy_timing.data_hs2lp + dphy_timing.data_lp2hs) *
576					   lanes * BITS_PER_BYTE, bpp);
577		if (hfp < delay_to_lp && hbp < delay_to_lp)
578			return MODE_HSYNC;
579	}
580
581	return MODE_OK;
582}
583
584static const struct dw_mipi_dsi_phy_ops dw_mipi_dsi_stm_phy_ops = {
585	.init = dw_mipi_dsi_phy_init,
586	.power_on = dw_mipi_dsi_phy_power_on,
587	.power_off = dw_mipi_dsi_phy_power_off,
588	.get_lane_mbps = dw_mipi_dsi_get_lane_mbps,
589	.get_timing = dw_mipi_dsi_phy_get_timing,
590};
591
592static struct dw_mipi_dsi_plat_data dw_mipi_dsi_stm_plat_data = {
593	.max_data_lanes = 2,
594	.mode_valid = dw_mipi_dsi_stm_mode_valid,
595	.phy_ops = &dw_mipi_dsi_stm_phy_ops,
596};
597
598static const struct of_device_id dw_mipi_dsi_stm_dt_ids[] = {
599	{ .compatible = "st,stm32-dsi", .data = &dw_mipi_dsi_stm_plat_data, },
600	{ },
601};
602MODULE_DEVICE_TABLE(of, dw_mipi_dsi_stm_dt_ids);
603
604static int dw_mipi_dsi_stm_probe(struct platform_device *pdev)
605{
606	struct device *dev = &pdev->dev;
607	struct dw_mipi_dsi_stm *dsi;
608	const struct dw_mipi_dsi_plat_data *pdata = of_device_get_match_data(dev);
609	int ret;
610
611	dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
612	if (!dsi)
613		return -ENOMEM;
614
615	dsi->base = devm_platform_ioremap_resource(pdev, 0);
 
616	if (IS_ERR(dsi->base)) {
617		ret = PTR_ERR(dsi->base);
618		DRM_ERROR("Unable to get dsi registers %d\n", ret);
619		return ret;
620	}
621
622	dsi->vdd_supply = devm_regulator_get(dev, "phy-dsi");
623	if (IS_ERR(dsi->vdd_supply)) {
624		ret = PTR_ERR(dsi->vdd_supply);
625		dev_err_probe(dev, ret, "Failed to request regulator\n");
626		return ret;
627	}
628
629	ret = regulator_enable(dsi->vdd_supply);
630	if (ret) {
631		DRM_ERROR("Failed to enable regulator: %d\n", ret);
632		return ret;
633	}
634
635	dsi->pllref_clk = devm_clk_get(dev, "ref");
636	if (IS_ERR(dsi->pllref_clk)) {
637		ret = PTR_ERR(dsi->pllref_clk);
638		dev_err_probe(dev, ret, "Unable to get pll reference clock\n");
639		goto err_clk_get;
640	}
641
642	ret = clk_prepare_enable(dsi->pllref_clk);
643	if (ret) {
644		DRM_ERROR("Failed to enable pllref_clk: %d\n", ret);
645		goto err_clk_get;
646	}
647
648	dsi->pclk = devm_clk_get(dev, "pclk");
649	if (IS_ERR(dsi->pclk)) {
650		ret = PTR_ERR(dsi->pclk);
651		DRM_ERROR("Unable to get peripheral clock: %d\n", ret);
652		goto err_dsi_probe;
653	}
654
655	ret = clk_prepare_enable(dsi->pclk);
656	if (ret) {
657		DRM_ERROR("%s: Failed to enable peripheral clk\n", __func__);
658		goto err_dsi_probe;
659	}
660
661	dsi->hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
662	clk_disable_unprepare(dsi->pclk);
663
664	if (dsi->hw_version != HWVER_130 && dsi->hw_version != HWVER_131) {
665		ret = -ENODEV;
666		DRM_ERROR("bad dsi hardware version\n");
667		goto err_dsi_probe;
668	}
669
670	/* set lane capabilities according to hw version */
671	dsi->lane_min_kbps = LANE_MIN_KBPS;
672	dsi->lane_max_kbps = LANE_MAX_KBPS;
673	if (dsi->hw_version == HWVER_131) {
674		dsi->lane_min_kbps *= 2;
675		dsi->lane_max_kbps *= 2;
676	}
677
678	dsi->pdata = *pdata;
679	dsi->pdata.base = dsi->base;
680	dsi->pdata.priv_data = dsi;
681
682	dsi->pdata.max_data_lanes = 2;
683	dsi->pdata.phy_ops = &dw_mipi_dsi_stm_phy_ops;
684
685	platform_set_drvdata(pdev, dsi);
686
687	dsi->dsi = dw_mipi_dsi_probe(pdev, &dsi->pdata);
688	if (IS_ERR(dsi->dsi)) {
689		ret = PTR_ERR(dsi->dsi);
690		dev_err_probe(dev, ret, "Failed to initialize mipi dsi host\n");
691		goto err_dsi_probe;
692	}
693
694	/*
695	 * We need to wait for the generic bridge to probe before enabling and
696	 * register the internal pixel clock.
697	 */
698	ret = clk_prepare_enable(dsi->pclk);
699	if (ret) {
700		DRM_ERROR("%s: Failed to enable peripheral clk\n", __func__);
701		goto err_dsi_probe;
702	}
703
704	ret = dw_mipi_dsi_clk_register(dsi, dev);
705	if (ret) {
706		DRM_ERROR("Failed to register DSI pixel clock: %d\n", ret);
707		clk_disable_unprepare(dsi->pclk);
708		goto err_dsi_probe;
709	}
710
711	clk_disable_unprepare(dsi->pclk);
712
713	return 0;
714
715err_dsi_probe:
716	clk_disable_unprepare(dsi->pllref_clk);
717err_clk_get:
718	regulator_disable(dsi->vdd_supply);
719
720	return ret;
721}
722
723static void dw_mipi_dsi_stm_remove(struct platform_device *pdev)
724{
725	struct dw_mipi_dsi_stm *dsi = platform_get_drvdata(pdev);
726
727	dw_mipi_dsi_remove(dsi->dsi);
728	clk_disable_unprepare(dsi->pllref_clk);
729	dw_mipi_dsi_clk_unregister(dsi);
730	regulator_disable(dsi->vdd_supply);
731}
732
733static int dw_mipi_dsi_stm_suspend(struct device *dev)
734{
735	struct dw_mipi_dsi_stm *dsi = dev_get_drvdata(dev);
736
737	DRM_DEBUG_DRIVER("\n");
738
739	clk_disable_unprepare(dsi->pllref_clk);
740	clk_disable_unprepare(dsi->pclk);
741	regulator_disable(dsi->vdd_supply);
742
743	return 0;
744}
745
746static int dw_mipi_dsi_stm_resume(struct device *dev)
747{
748	struct dw_mipi_dsi_stm *dsi = dev_get_drvdata(dev);
749	int ret;
750
751	DRM_DEBUG_DRIVER("\n");
752
753	ret = regulator_enable(dsi->vdd_supply);
754	if (ret) {
755		DRM_ERROR("Failed to enable regulator: %d\n", ret);
756		return ret;
757	}
758
759	ret = clk_prepare_enable(dsi->pclk);
760	if (ret) {
761		regulator_disable(dsi->vdd_supply);
762		DRM_ERROR("Failed to enable pclk: %d\n", ret);
763		return ret;
764	}
765
766	ret = clk_prepare_enable(dsi->pllref_clk);
767	if (ret) {
768		clk_disable_unprepare(dsi->pclk);
769		regulator_disable(dsi->vdd_supply);
770		DRM_ERROR("Failed to enable pllref_clk: %d\n", ret);
771		return ret;
772	}
773
774	return 0;
775}
776
777static const struct dev_pm_ops dw_mipi_dsi_stm_pm_ops = {
778	SYSTEM_SLEEP_PM_OPS(dw_mipi_dsi_stm_suspend,
779			    dw_mipi_dsi_stm_resume)
780	RUNTIME_PM_OPS(dw_mipi_dsi_stm_suspend,
781		       dw_mipi_dsi_stm_resume, NULL)
782};
783
784static struct platform_driver dw_mipi_dsi_stm_driver = {
785	.probe		= dw_mipi_dsi_stm_probe,
786	.remove		= dw_mipi_dsi_stm_remove,
787	.driver		= {
788		.of_match_table = dw_mipi_dsi_stm_dt_ids,
789		.name	= "stm32-display-dsi",
790		.pm = &dw_mipi_dsi_stm_pm_ops,
791	},
792};
793
794module_platform_driver(dw_mipi_dsi_stm_driver);
795
796MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
797MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
798MODULE_DESCRIPTION("STMicroelectronics DW MIPI DSI host controller driver");
799MODULE_LICENSE("GPL v2");