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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2017 Samsung Electronics
4 *
5 * Authors:
6 * Tomasz Stanislawski <t.stanislaws@samsung.com>
7 * Maciej Purski <m.purski@samsung.com>
8 *
9 * Based on sii9234 driver created by:
10 * Adam Hampson <ahampson@sta.samsung.com>
11 * Erik Gilling <konkers@android.com>
12 * Shankar Bandal <shankar.b@samsung.com>
13 * Dharam Kumar <dharam.kr@samsung.com>
14 */
15#include <drm/bridge/mhl.h>
16#include <drm/drm_crtc.h>
17#include <drm/drm_edid.h>
18
19#include <linux/delay.h>
20#include <linux/err.h>
21#include <linux/gpio/consumer.h>
22#include <linux/i2c.h>
23#include <linux/interrupt.h>
24#include <linux/irq.h>
25#include <linux/kernel.h>
26#include <linux/module.h>
27#include <linux/mutex.h>
28#include <linux/regulator/consumer.h>
29#include <linux/slab.h>
30
31#define CBUS_DEVCAP_OFFSET 0x80
32
33#define SII9234_MHL_VERSION 0x11
34#define SII9234_SCRATCHPAD_SIZE 0x10
35#define SII9234_INT_STAT_SIZE 0x33
36
37#define BIT_TMDS_CCTRL_TMDS_OE BIT(4)
38#define MHL_HPD_OUT_OVR_EN BIT(4)
39#define MHL_HPD_OUT_OVR_VAL BIT(5)
40#define MHL_INIT_TIMEOUT 0x0C
41
42/* MHL Tx registers and bits */
43#define MHL_TX_SRST 0x05
44#define MHL_TX_SYSSTAT_REG 0x09
45#define MHL_TX_INTR1_REG 0x71
46#define MHL_TX_INTR4_REG 0x74
47#define MHL_TX_INTR1_ENABLE_REG 0x75
48#define MHL_TX_INTR4_ENABLE_REG 0x78
49#define MHL_TX_INT_CTRL_REG 0x79
50#define MHL_TX_TMDS_CCTRL 0x80
51#define MHL_TX_DISC_CTRL1_REG 0x90
52#define MHL_TX_DISC_CTRL2_REG 0x91
53#define MHL_TX_DISC_CTRL3_REG 0x92
54#define MHL_TX_DISC_CTRL4_REG 0x93
55#define MHL_TX_DISC_CTRL5_REG 0x94
56#define MHL_TX_DISC_CTRL6_REG 0x95
57#define MHL_TX_DISC_CTRL7_REG 0x96
58#define MHL_TX_DISC_CTRL8_REG 0x97
59#define MHL_TX_STAT2_REG 0x99
60#define MHL_TX_MHLTX_CTL1_REG 0xA0
61#define MHL_TX_MHLTX_CTL2_REG 0xA1
62#define MHL_TX_MHLTX_CTL4_REG 0xA3
63#define MHL_TX_MHLTX_CTL6_REG 0xA5
64#define MHL_TX_MHLTX_CTL7_REG 0xA6
65
66#define RSEN_STATUS BIT(2)
67#define HPD_CHANGE_INT BIT(6)
68#define RSEN_CHANGE_INT BIT(5)
69#define RGND_READY_INT BIT(6)
70#define VBUS_LOW_INT BIT(5)
71#define CBUS_LKOUT_INT BIT(4)
72#define MHL_DISC_FAIL_INT BIT(3)
73#define MHL_EST_INT BIT(2)
74#define HPD_CHANGE_INT_MASK BIT(6)
75#define RSEN_CHANGE_INT_MASK BIT(5)
76
77#define RGND_READY_MASK BIT(6)
78#define CBUS_LKOUT_MASK BIT(4)
79#define MHL_DISC_FAIL_MASK BIT(3)
80#define MHL_EST_MASK BIT(2)
81
82#define SKIP_GND BIT(6)
83
84#define ATT_THRESH_SHIFT 0x04
85#define ATT_THRESH_MASK (0x03 << ATT_THRESH_SHIFT)
86#define USB_D_OEN BIT(3)
87#define DEGLITCH_TIME_MASK 0x07
88#define DEGLITCH_TIME_2MS 0
89#define DEGLITCH_TIME_4MS 1
90#define DEGLITCH_TIME_8MS 2
91#define DEGLITCH_TIME_16MS 3
92#define DEGLITCH_TIME_40MS 4
93#define DEGLITCH_TIME_50MS 5
94#define DEGLITCH_TIME_60MS 6
95#define DEGLITCH_TIME_128MS 7
96
97#define USB_D_OVR BIT(7)
98#define USB_ID_OVR BIT(6)
99#define DVRFLT_SEL BIT(5)
100#define BLOCK_RGND_INT BIT(4)
101#define SKIP_DEG BIT(3)
102#define CI2CA_POL BIT(2)
103#define CI2CA_WKUP BIT(1)
104#define SINGLE_ATT BIT(0)
105
106#define USB_D_ODN BIT(5)
107#define VBUS_CHECK BIT(2)
108#define RGND_INTP_MASK 0x03
109#define RGND_INTP_OPEN 0
110#define RGND_INTP_2K 1
111#define RGND_INTP_1K 2
112#define RGND_INTP_SHORT 3
113
114/* HDMI registers */
115#define HDMI_RX_TMDS0_CCTRL1_REG 0x10
116#define HDMI_RX_TMDS_CLK_EN_REG 0x11
117#define HDMI_RX_TMDS_CH_EN_REG 0x12
118#define HDMI_RX_PLL_CALREFSEL_REG 0x17
119#define HDMI_RX_PLL_VCOCAL_REG 0x1A
120#define HDMI_RX_EQ_DATA0_REG 0x22
121#define HDMI_RX_EQ_DATA1_REG 0x23
122#define HDMI_RX_EQ_DATA2_REG 0x24
123#define HDMI_RX_EQ_DATA3_REG 0x25
124#define HDMI_RX_EQ_DATA4_REG 0x26
125#define HDMI_RX_TMDS_ZONE_CTRL_REG 0x4C
126#define HDMI_RX_TMDS_MODE_CTRL_REG 0x4D
127
128/* CBUS registers */
129#define CBUS_INT_STATUS_1_REG 0x08
130#define CBUS_INTR1_ENABLE_REG 0x09
131#define CBUS_MSC_REQ_ABORT_REASON_REG 0x0D
132#define CBUS_INT_STATUS_2_REG 0x1E
133#define CBUS_INTR2_ENABLE_REG 0x1F
134#define CBUS_LINK_CONTROL_2_REG 0x31
135#define CBUS_MHL_STATUS_REG_0 0xB0
136#define CBUS_MHL_STATUS_REG_1 0xB1
137
138#define BIT_CBUS_RESET BIT(3)
139#define SET_HPD_DOWNSTREAM BIT(6)
140
141/* TPI registers */
142#define TPI_DPD_REG 0x3D
143
144/* Timeouts in msec */
145#define T_SRC_VBUS_CBUS_TO_STABLE 200
146#define T_SRC_CBUS_FLOAT 100
147#define T_SRC_CBUS_DEGLITCH 2
148#define T_SRC_RXSENSE_DEGLITCH 110
149
150#define MHL1_MAX_CLK 75000 /* in kHz */
151
152#define I2C_TPI_ADDR 0x3D
153#define I2C_HDMI_ADDR 0x49
154#define I2C_CBUS_ADDR 0x64
155
156enum sii9234_state {
157 ST_OFF,
158 ST_D3,
159 ST_RGND_INIT,
160 ST_RGND_1K,
161 ST_RSEN_HIGH,
162 ST_MHL_ESTABLISHED,
163 ST_FAILURE_DISCOVERY,
164 ST_FAILURE,
165};
166
167struct sii9234 {
168 struct i2c_client *client[4];
169 struct drm_bridge bridge;
170 struct device *dev;
171 struct gpio_desc *gpio_reset;
172 int i2c_error;
173 struct regulator_bulk_data supplies[4];
174
175 struct mutex lock; /* Protects fields below and device registers */
176 enum sii9234_state state;
177};
178
179enum sii9234_client_id {
180 I2C_MHL,
181 I2C_TPI,
182 I2C_HDMI,
183 I2C_CBUS,
184};
185
186static const char * const sii9234_client_name[] = {
187 [I2C_MHL] = "MHL",
188 [I2C_TPI] = "TPI",
189 [I2C_HDMI] = "HDMI",
190 [I2C_CBUS] = "CBUS",
191};
192
193static int sii9234_writeb(struct sii9234 *ctx, int id, int offset,
194 int value)
195{
196 int ret;
197 struct i2c_client *client = ctx->client[id];
198
199 if (ctx->i2c_error)
200 return ctx->i2c_error;
201
202 ret = i2c_smbus_write_byte_data(client, offset, value);
203 if (ret < 0)
204 dev_err(ctx->dev, "writeb: %4s[0x%02x] <- 0x%02x\n",
205 sii9234_client_name[id], offset, value);
206 ctx->i2c_error = ret;
207
208 return ret;
209}
210
211static int sii9234_writebm(struct sii9234 *ctx, int id, int offset,
212 int value, int mask)
213{
214 int ret;
215 struct i2c_client *client = ctx->client[id];
216
217 if (ctx->i2c_error)
218 return ctx->i2c_error;
219
220 ret = i2c_smbus_write_byte(client, offset);
221 if (ret < 0) {
222 dev_err(ctx->dev, "writebm: %4s[0x%02x] <- 0x%02x\n",
223 sii9234_client_name[id], offset, value);
224 ctx->i2c_error = ret;
225 return ret;
226 }
227
228 ret = i2c_smbus_read_byte(client);
229 if (ret < 0) {
230 dev_err(ctx->dev, "writebm: %4s[0x%02x] <- 0x%02x\n",
231 sii9234_client_name[id], offset, value);
232 ctx->i2c_error = ret;
233 return ret;
234 }
235
236 value = (value & mask) | (ret & ~mask);
237
238 ret = i2c_smbus_write_byte_data(client, offset, value);
239 if (ret < 0) {
240 dev_err(ctx->dev, "writebm: %4s[0x%02x] <- 0x%02x\n",
241 sii9234_client_name[id], offset, value);
242 ctx->i2c_error = ret;
243 }
244
245 return ret;
246}
247
248static int sii9234_readb(struct sii9234 *ctx, int id, int offset)
249{
250 int ret;
251 struct i2c_client *client = ctx->client[id];
252
253 if (ctx->i2c_error)
254 return ctx->i2c_error;
255
256 ret = i2c_smbus_write_byte(client, offset);
257 if (ret < 0) {
258 dev_err(ctx->dev, "readb: %4s[0x%02x]\n",
259 sii9234_client_name[id], offset);
260 ctx->i2c_error = ret;
261 return ret;
262 }
263
264 ret = i2c_smbus_read_byte(client);
265 if (ret < 0) {
266 dev_err(ctx->dev, "readb: %4s[0x%02x]\n",
267 sii9234_client_name[id], offset);
268 ctx->i2c_error = ret;
269 }
270
271 return ret;
272}
273
274static int sii9234_clear_error(struct sii9234 *ctx)
275{
276 int ret = ctx->i2c_error;
277
278 ctx->i2c_error = 0;
279
280 return ret;
281}
282
283#define mhl_tx_writeb(sii9234, offset, value) \
284 sii9234_writeb(sii9234, I2C_MHL, offset, value)
285#define mhl_tx_writebm(sii9234, offset, value, mask) \
286 sii9234_writebm(sii9234, I2C_MHL, offset, value, mask)
287#define mhl_tx_readb(sii9234, offset) \
288 sii9234_readb(sii9234, I2C_MHL, offset)
289#define cbus_writeb(sii9234, offset, value) \
290 sii9234_writeb(sii9234, I2C_CBUS, offset, value)
291#define cbus_writebm(sii9234, offset, value, mask) \
292 sii9234_writebm(sii9234, I2C_CBUS, offset, value, mask)
293#define cbus_readb(sii9234, offset) \
294 sii9234_readb(sii9234, I2C_CBUS, offset)
295#define hdmi_writeb(sii9234, offset, value) \
296 sii9234_writeb(sii9234, I2C_HDMI, offset, value)
297#define hdmi_writebm(sii9234, offset, value, mask) \
298 sii9234_writebm(sii9234, I2C_HDMI, offset, value, mask)
299#define hdmi_readb(sii9234, offset) \
300 sii9234_readb(sii9234, I2C_HDMI, offset)
301#define tpi_writeb(sii9234, offset, value) \
302 sii9234_writeb(sii9234, I2C_TPI, offset, value)
303#define tpi_writebm(sii9234, offset, value, mask) \
304 sii9234_writebm(sii9234, I2C_TPI, offset, value, mask)
305#define tpi_readb(sii9234, offset) \
306 sii9234_readb(sii9234, I2C_TPI, offset)
307
308static u8 sii9234_tmds_control(struct sii9234 *ctx, bool enable)
309{
310 mhl_tx_writebm(ctx, MHL_TX_TMDS_CCTRL, enable ? ~0 : 0,
311 BIT_TMDS_CCTRL_TMDS_OE);
312 mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, enable ? ~0 : 0,
313 MHL_HPD_OUT_OVR_EN | MHL_HPD_OUT_OVR_VAL);
314 return sii9234_clear_error(ctx);
315}
316
317static int sii9234_cbus_reset(struct sii9234 *ctx)
318{
319 int i;
320
321 mhl_tx_writebm(ctx, MHL_TX_SRST, ~0, BIT_CBUS_RESET);
322 msleep(T_SRC_CBUS_DEGLITCH);
323 mhl_tx_writebm(ctx, MHL_TX_SRST, 0, BIT_CBUS_RESET);
324
325 for (i = 0; i < 4; i++) {
326 /*
327 * Enable WRITE_STAT interrupt for writes to all
328 * 4 MSC Status registers.
329 */
330 cbus_writeb(ctx, 0xE0 + i, 0xF2);
331 /*
332 * Enable SET_INT interrupt for writes to all
333 * 4 MSC Interrupt registers.
334 */
335 cbus_writeb(ctx, 0xF0 + i, 0xF2);
336 }
337
338 return sii9234_clear_error(ctx);
339}
340
341/* Require to chek mhl imformation of samsung in cbus_init_register */
342static int sii9234_cbus_init(struct sii9234 *ctx)
343{
344 cbus_writeb(ctx, 0x07, 0xF2);
345 cbus_writeb(ctx, 0x40, 0x03);
346 cbus_writeb(ctx, 0x42, 0x06);
347 cbus_writeb(ctx, 0x36, 0x0C);
348 cbus_writeb(ctx, 0x3D, 0xFD);
349 cbus_writeb(ctx, 0x1C, 0x01);
350 cbus_writeb(ctx, 0x1D, 0x0F);
351 cbus_writeb(ctx, 0x44, 0x02);
352 /* Setup our devcap */
353 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_DEV_STATE, 0x00);
354 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_MHL_VERSION,
355 SII9234_MHL_VERSION);
356 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_CAT,
357 MHL_DCAP_CAT_SOURCE);
358 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_ADOPTER_ID_H, 0x01);
359 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_ADOPTER_ID_L, 0x41);
360 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_VID_LINK_MODE,
361 MHL_DCAP_VID_LINK_RGB444 | MHL_DCAP_VID_LINK_YCBCR444);
362 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_VIDEO_TYPE,
363 MHL_DCAP_VT_GRAPHICS);
364 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_LOG_DEV_MAP,
365 MHL_DCAP_LD_GUI);
366 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_BANDWIDTH, 0x0F);
367 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_FEATURE_FLAG,
368 MHL_DCAP_FEATURE_RCP_SUPPORT | MHL_DCAP_FEATURE_RAP_SUPPORT
369 | MHL_DCAP_FEATURE_SP_SUPPORT);
370 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_DEVICE_ID_H, 0x0);
371 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_DEVICE_ID_L, 0x0);
372 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_SCRATCHPAD_SIZE,
373 SII9234_SCRATCHPAD_SIZE);
374 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_INT_STAT_SIZE,
375 SII9234_INT_STAT_SIZE);
376 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_RESERVED, 0);
377 cbus_writebm(ctx, 0x31, 0x0C, 0x0C);
378 cbus_writeb(ctx, 0x30, 0x01);
379 cbus_writebm(ctx, 0x3C, 0x30, 0x38);
380 cbus_writebm(ctx, 0x22, 0x0D, 0x0F);
381 cbus_writebm(ctx, 0x2E, 0x15, 0x15);
382 cbus_writeb(ctx, CBUS_INTR1_ENABLE_REG, 0);
383 cbus_writeb(ctx, CBUS_INTR2_ENABLE_REG, 0);
384
385 return sii9234_clear_error(ctx);
386}
387
388static void force_usb_id_switch_open(struct sii9234 *ctx)
389{
390 /* Disable CBUS discovery */
391 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, 0, 0x01);
392 /* Force USB ID switch to open */
393 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, ~0, USB_ID_OVR);
394 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL3_REG, ~0, 0x86);
395 /* Force upstream HPD to 0 when not in MHL mode. */
396 mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, 0, 0x30);
397}
398
399static void release_usb_id_switch_open(struct sii9234 *ctx)
400{
401 msleep(T_SRC_CBUS_FLOAT);
402 /* Clear USB ID switch to open */
403 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, 0, USB_ID_OVR);
404 /* Enable CBUS discovery */
405 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, ~0, 0x01);
406}
407
408static int sii9234_power_init(struct sii9234 *ctx)
409{
410 /* Force the SiI9234 into the D0 state. */
411 tpi_writeb(ctx, TPI_DPD_REG, 0x3F);
412 /* Enable TxPLL Clock */
413 hdmi_writeb(ctx, HDMI_RX_TMDS_CLK_EN_REG, 0x01);
414 /* Enable Tx Clock Path & Equalizer */
415 hdmi_writeb(ctx, HDMI_RX_TMDS_CH_EN_REG, 0x15);
416 /* Power Up TMDS */
417 mhl_tx_writeb(ctx, 0x08, 0x35);
418 return sii9234_clear_error(ctx);
419}
420
421static int sii9234_hdmi_init(struct sii9234 *ctx)
422{
423 hdmi_writeb(ctx, HDMI_RX_TMDS0_CCTRL1_REG, 0xC1);
424 hdmi_writeb(ctx, HDMI_RX_PLL_CALREFSEL_REG, 0x03);
425 hdmi_writeb(ctx, HDMI_RX_PLL_VCOCAL_REG, 0x20);
426 hdmi_writeb(ctx, HDMI_RX_EQ_DATA0_REG, 0x8A);
427 hdmi_writeb(ctx, HDMI_RX_EQ_DATA1_REG, 0x6A);
428 hdmi_writeb(ctx, HDMI_RX_EQ_DATA2_REG, 0xAA);
429 hdmi_writeb(ctx, HDMI_RX_EQ_DATA3_REG, 0xCA);
430 hdmi_writeb(ctx, HDMI_RX_EQ_DATA4_REG, 0xEA);
431 hdmi_writeb(ctx, HDMI_RX_TMDS_ZONE_CTRL_REG, 0xA0);
432 hdmi_writeb(ctx, HDMI_RX_TMDS_MODE_CTRL_REG, 0x00);
433 mhl_tx_writeb(ctx, MHL_TX_TMDS_CCTRL, 0x34);
434 hdmi_writeb(ctx, 0x45, 0x44);
435 hdmi_writeb(ctx, 0x31, 0x0A);
436 hdmi_writeb(ctx, HDMI_RX_TMDS0_CCTRL1_REG, 0xC1);
437
438 return sii9234_clear_error(ctx);
439}
440
441static int sii9234_mhl_tx_ctl_int(struct sii9234 *ctx)
442{
443 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL1_REG, 0xD0);
444 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL2_REG, 0xFC);
445 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL4_REG, 0xEB);
446 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL7_REG, 0x0C);
447
448 return sii9234_clear_error(ctx);
449}
450
451static int sii9234_reset(struct sii9234 *ctx)
452{
453 int ret;
454
455 sii9234_clear_error(ctx);
456
457 ret = sii9234_power_init(ctx);
458 if (ret < 0)
459 return ret;
460 ret = sii9234_cbus_reset(ctx);
461 if (ret < 0)
462 return ret;
463 ret = sii9234_hdmi_init(ctx);
464 if (ret < 0)
465 return ret;
466 ret = sii9234_mhl_tx_ctl_int(ctx);
467 if (ret < 0)
468 return ret;
469
470 /* Enable HDCP Compliance safety */
471 mhl_tx_writeb(ctx, 0x2B, 0x01);
472 /* CBUS discovery cycle time for each drive and float = 150us */
473 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, 0x04, 0x06);
474 /* Clear bit 6 (reg_skip_rgnd) */
475 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL2_REG, (1 << 7) /* Reserved */
476 | 2 << ATT_THRESH_SHIFT | DEGLITCH_TIME_50MS);
477 /*
478 * Changed from 66 to 65 for 94[1:0] = 01 = 5k reg_cbusmhl_pup_sel
479 * 1.8V CBUS VTH & GND threshold
480 * to meet CTS 3.3.7.2 spec
481 */
482 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL5_REG, 0x77);
483 cbus_writebm(ctx, CBUS_LINK_CONTROL_2_REG, ~0, MHL_INIT_TIMEOUT);
484 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL6_REG, 0xA0);
485 /* RGND & single discovery attempt (RGND blocking) */
486 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL6_REG, BLOCK_RGND_INT |
487 DVRFLT_SEL | SINGLE_ATT);
488 /* Use VBUS path of discovery state machine */
489 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL8_REG, 0);
490 /* 0x92[3] sets the CBUS / ID switch */
491 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, ~0, USB_ID_OVR);
492 /*
493 * To allow RGND engine to operate correctly.
494 * When moving the chip from D2 to D0 (power up, init regs)
495 * the values should be
496 * 94[1:0] = 01 reg_cbusmhl_pup_sel[1:0] should be set for 5k
497 * 93[7:6] = 10 reg_cbusdisc_pup_sel[1:0] should be
498 * set for 10k (default)
499 * 93[5:4] = 00 reg_cbusidle_pup_sel[1:0] = open (default)
500 */
501 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL3_REG, ~0, 0x86);
502 /*
503 * Change from CC to 8C to match 5K
504 * to meet CTS 3.3.72 spec
505 */
506 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL4_REG, ~0, 0x8C);
507 /* Configure the interrupt as active high */
508 mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, 0, 0x06);
509
510 msleep(25);
511
512 /* Release usb_id switch */
513 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, 0, USB_ID_OVR);
514 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL1_REG, 0x27);
515
516 ret = sii9234_clear_error(ctx);
517 if (ret < 0)
518 return ret;
519 ret = sii9234_cbus_init(ctx);
520 if (ret < 0)
521 return ret;
522
523 /* Enable Auto soft reset on SCDT = 0 */
524 mhl_tx_writeb(ctx, 0x05, 0x04);
525 /* HDMI Transcode mode enable */
526 mhl_tx_writeb(ctx, 0x0D, 0x1C);
527 mhl_tx_writeb(ctx, MHL_TX_INTR4_ENABLE_REG,
528 RGND_READY_MASK | CBUS_LKOUT_MASK
529 | MHL_DISC_FAIL_MASK | MHL_EST_MASK);
530 mhl_tx_writeb(ctx, MHL_TX_INTR1_ENABLE_REG, 0x60);
531
532 /* This point is very important before measure RGND impedance */
533 force_usb_id_switch_open(ctx);
534 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL4_REG, 0, 0xF0);
535 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL5_REG, 0, 0x03);
536 release_usb_id_switch_open(ctx);
537
538 /* Force upstream HPD to 0 when not in MHL mode */
539 mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, 0, 1 << 5);
540 mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, ~0, 1 << 4);
541
542 return sii9234_clear_error(ctx);
543}
544
545static int sii9234_goto_d3(struct sii9234 *ctx)
546{
547 int ret;
548
549 dev_dbg(ctx->dev, "sii9234: detection started d3\n");
550
551 ret = sii9234_reset(ctx);
552 if (ret < 0)
553 goto exit;
554
555 hdmi_writeb(ctx, 0x01, 0x03);
556 tpi_writebm(ctx, TPI_DPD_REG, 0, 1);
557 /* I2C above is expected to fail because power goes down */
558 sii9234_clear_error(ctx);
559
560 ctx->state = ST_D3;
561
562 return 0;
563 exit:
564 dev_err(ctx->dev, "%s failed\n", __func__);
565 return -1;
566}
567
568static int sii9234_hw_on(struct sii9234 *ctx)
569{
570 return regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
571}
572
573static void sii9234_hw_off(struct sii9234 *ctx)
574{
575 gpiod_set_value(ctx->gpio_reset, 1);
576 msleep(20);
577 regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
578}
579
580static void sii9234_hw_reset(struct sii9234 *ctx)
581{
582 gpiod_set_value(ctx->gpio_reset, 1);
583 msleep(20);
584 gpiod_set_value(ctx->gpio_reset, 0);
585}
586
587static void sii9234_cable_in(struct sii9234 *ctx)
588{
589 int ret;
590
591 mutex_lock(&ctx->lock);
592 if (ctx->state != ST_OFF)
593 goto unlock;
594 ret = sii9234_hw_on(ctx);
595 if (ret < 0)
596 goto unlock;
597
598 sii9234_hw_reset(ctx);
599 sii9234_goto_d3(ctx);
600 /* To avoid irq storm, when hw is in meta state */
601 enable_irq(to_i2c_client(ctx->dev)->irq);
602
603unlock:
604 mutex_unlock(&ctx->lock);
605}
606
607static void sii9234_cable_out(struct sii9234 *ctx)
608{
609 mutex_lock(&ctx->lock);
610
611 if (ctx->state == ST_OFF)
612 goto unlock;
613
614 disable_irq(to_i2c_client(ctx->dev)->irq);
615 tpi_writeb(ctx, TPI_DPD_REG, 0);
616 /* Turn on&off hpd festure for only QCT HDMI */
617 sii9234_hw_off(ctx);
618
619 ctx->state = ST_OFF;
620
621unlock:
622 mutex_unlock(&ctx->lock);
623}
624
625static enum sii9234_state sii9234_rgnd_ready_irq(struct sii9234 *ctx)
626{
627 int value;
628
629 if (ctx->state == ST_D3) {
630 int ret;
631
632 dev_dbg(ctx->dev, "RGND_READY_INT\n");
633 sii9234_hw_reset(ctx);
634
635 ret = sii9234_reset(ctx);
636 if (ret < 0) {
637 dev_err(ctx->dev, "sii9234_reset() failed\n");
638 return ST_FAILURE;
639 }
640
641 return ST_RGND_INIT;
642 }
643
644 /* Got interrupt in inappropriate state */
645 if (ctx->state != ST_RGND_INIT)
646 return ST_FAILURE;
647
648 value = mhl_tx_readb(ctx, MHL_TX_STAT2_REG);
649 if (sii9234_clear_error(ctx))
650 return ST_FAILURE;
651
652 if ((value & RGND_INTP_MASK) != RGND_INTP_1K) {
653 dev_warn(ctx->dev, "RGND is not 1k\n");
654 return ST_RGND_INIT;
655 }
656 dev_dbg(ctx->dev, "RGND 1K!!\n");
657 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL4_REG, ~0, 0x8C);
658 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL5_REG, 0x77);
659 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, ~0, 0x05);
660 if (sii9234_clear_error(ctx))
661 return ST_FAILURE;
662
663 msleep(T_SRC_VBUS_CBUS_TO_STABLE);
664 return ST_RGND_1K;
665}
666
667static enum sii9234_state sii9234_mhl_established(struct sii9234 *ctx)
668{
669 dev_dbg(ctx->dev, "mhl est interrupt\n");
670
671 /* Discovery override */
672 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL1_REG, 0x10);
673 /* Increase DDC translation layer timer (byte mode) */
674 cbus_writeb(ctx, 0x07, 0x32);
675 cbus_writebm(ctx, 0x44, ~0, 1 << 1);
676 /* Keep the discovery enabled. Need RGND interrupt */
677 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, ~0, 1);
678 mhl_tx_writeb(ctx, MHL_TX_INTR1_ENABLE_REG,
679 RSEN_CHANGE_INT_MASK | HPD_CHANGE_INT_MASK);
680
681 if (sii9234_clear_error(ctx))
682 return ST_FAILURE;
683
684 return ST_MHL_ESTABLISHED;
685}
686
687static enum sii9234_state sii9234_hpd_change(struct sii9234 *ctx)
688{
689 int value;
690
691 value = cbus_readb(ctx, CBUS_MSC_REQ_ABORT_REASON_REG);
692 if (sii9234_clear_error(ctx))
693 return ST_FAILURE;
694
695 if (value & SET_HPD_DOWNSTREAM) {
696 /* Downstream HPD High, Enable TMDS */
697 sii9234_tmds_control(ctx, true);
698 } else {
699 /* Downstream HPD Low, Disable TMDS */
700 sii9234_tmds_control(ctx, false);
701 }
702
703 return ctx->state;
704}
705
706static enum sii9234_state sii9234_rsen_change(struct sii9234 *ctx)
707{
708 int value;
709
710 /* Work_around code to handle wrong interrupt */
711 if (ctx->state != ST_RGND_1K) {
712 dev_err(ctx->dev, "RSEN_HIGH without RGND_1K\n");
713 return ST_FAILURE;
714 }
715 value = mhl_tx_readb(ctx, MHL_TX_SYSSTAT_REG);
716 if (value < 0)
717 return ST_FAILURE;
718
719 if (value & RSEN_STATUS) {
720 dev_dbg(ctx->dev, "MHL cable connected.. RSEN High\n");
721 return ST_RSEN_HIGH;
722 }
723 dev_dbg(ctx->dev, "RSEN lost\n");
724 /*
725 * Once RSEN loss is confirmed,we need to check
726 * based on cable status and chip power status,whether
727 * it is SINK Loss(HDMI cable not connected, TV Off)
728 * or MHL cable disconnection
729 * TODO: Define the below mhl_disconnection()
730 */
731 msleep(T_SRC_RXSENSE_DEGLITCH);
732 value = mhl_tx_readb(ctx, MHL_TX_SYSSTAT_REG);
733 if (value < 0)
734 return ST_FAILURE;
735 dev_dbg(ctx->dev, "sys_stat: %x\n", value);
736
737 if (value & RSEN_STATUS) {
738 dev_dbg(ctx->dev, "RSEN recovery\n");
739 return ST_RSEN_HIGH;
740 }
741 dev_dbg(ctx->dev, "RSEN Really LOW\n");
742 /* To meet CTS 3.3.22.2 spec */
743 sii9234_tmds_control(ctx, false);
744 force_usb_id_switch_open(ctx);
745 release_usb_id_switch_open(ctx);
746
747 return ST_FAILURE;
748}
749
750static irqreturn_t sii9234_irq_thread(int irq, void *data)
751{
752 struct sii9234 *ctx = data;
753 int intr1, intr4;
754 int intr1_en, intr4_en;
755 int cbus_intr1, cbus_intr2;
756
757 dev_dbg(ctx->dev, "%s\n", __func__);
758
759 mutex_lock(&ctx->lock);
760
761 intr1 = mhl_tx_readb(ctx, MHL_TX_INTR1_REG);
762 intr4 = mhl_tx_readb(ctx, MHL_TX_INTR4_REG);
763 intr1_en = mhl_tx_readb(ctx, MHL_TX_INTR1_ENABLE_REG);
764 intr4_en = mhl_tx_readb(ctx, MHL_TX_INTR4_ENABLE_REG);
765 cbus_intr1 = cbus_readb(ctx, CBUS_INT_STATUS_1_REG);
766 cbus_intr2 = cbus_readb(ctx, CBUS_INT_STATUS_2_REG);
767
768 if (sii9234_clear_error(ctx))
769 goto done;
770
771 dev_dbg(ctx->dev, "irq %02x/%02x %02x/%02x %02x/%02x\n",
772 intr1, intr1_en, intr4, intr4_en, cbus_intr1, cbus_intr2);
773
774 if (intr4 & RGND_READY_INT)
775 ctx->state = sii9234_rgnd_ready_irq(ctx);
776 if (intr1 & RSEN_CHANGE_INT)
777 ctx->state = sii9234_rsen_change(ctx);
778 if (intr4 & MHL_EST_INT)
779 ctx->state = sii9234_mhl_established(ctx);
780 if (intr1 & HPD_CHANGE_INT)
781 ctx->state = sii9234_hpd_change(ctx);
782 if (intr4 & CBUS_LKOUT_INT)
783 ctx->state = ST_FAILURE;
784 if (intr4 & MHL_DISC_FAIL_INT)
785 ctx->state = ST_FAILURE_DISCOVERY;
786
787 done:
788 /* Clean interrupt status and pending flags */
789 mhl_tx_writeb(ctx, MHL_TX_INTR1_REG, intr1);
790 mhl_tx_writeb(ctx, MHL_TX_INTR4_REG, intr4);
791 cbus_writeb(ctx, CBUS_MHL_STATUS_REG_0, 0xFF);
792 cbus_writeb(ctx, CBUS_MHL_STATUS_REG_1, 0xFF);
793 cbus_writeb(ctx, CBUS_INT_STATUS_1_REG, cbus_intr1);
794 cbus_writeb(ctx, CBUS_INT_STATUS_2_REG, cbus_intr2);
795
796 sii9234_clear_error(ctx);
797
798 if (ctx->state == ST_FAILURE) {
799 dev_dbg(ctx->dev, "try to reset after failure\n");
800 sii9234_hw_reset(ctx);
801 sii9234_goto_d3(ctx);
802 }
803
804 if (ctx->state == ST_FAILURE_DISCOVERY) {
805 dev_err(ctx->dev, "discovery failed, no power for MHL?\n");
806 tpi_writebm(ctx, TPI_DPD_REG, 0, 1);
807 ctx->state = ST_D3;
808 }
809
810 mutex_unlock(&ctx->lock);
811
812 return IRQ_HANDLED;
813}
814
815static int sii9234_init_resources(struct sii9234 *ctx,
816 struct i2c_client *client)
817{
818 struct i2c_adapter *adapter = client->adapter;
819 int ret;
820
821 if (!ctx->dev->of_node) {
822 dev_err(ctx->dev, "not DT device\n");
823 return -ENODEV;
824 }
825
826 ctx->gpio_reset = devm_gpiod_get(ctx->dev, "reset", GPIOD_OUT_LOW);
827 if (IS_ERR(ctx->gpio_reset)) {
828 dev_err(ctx->dev, "failed to get reset gpio from DT\n");
829 return PTR_ERR(ctx->gpio_reset);
830 }
831
832 ctx->supplies[0].supply = "avcc12";
833 ctx->supplies[1].supply = "avcc33";
834 ctx->supplies[2].supply = "iovcc18";
835 ctx->supplies[3].supply = "cvcc12";
836 ret = devm_regulator_bulk_get(ctx->dev, 4, ctx->supplies);
837 if (ret) {
838 dev_err(ctx->dev, "regulator_bulk failed\n");
839 return ret;
840 }
841
842 ctx->client[I2C_MHL] = client;
843
844 ctx->client[I2C_TPI] = i2c_new_dummy(adapter, I2C_TPI_ADDR);
845 if (!ctx->client[I2C_TPI]) {
846 dev_err(ctx->dev, "failed to create TPI client\n");
847 return -ENODEV;
848 }
849
850 ctx->client[I2C_HDMI] = i2c_new_dummy(adapter, I2C_HDMI_ADDR);
851 if (!ctx->client[I2C_HDMI]) {
852 dev_err(ctx->dev, "failed to create HDMI RX client\n");
853 goto fail_tpi;
854 }
855
856 ctx->client[I2C_CBUS] = i2c_new_dummy(adapter, I2C_CBUS_ADDR);
857 if (!ctx->client[I2C_CBUS]) {
858 dev_err(ctx->dev, "failed to create CBUS client\n");
859 goto fail_hdmi;
860 }
861
862 return 0;
863
864fail_hdmi:
865 i2c_unregister_device(ctx->client[I2C_HDMI]);
866fail_tpi:
867 i2c_unregister_device(ctx->client[I2C_TPI]);
868
869 return -ENODEV;
870}
871
872static void sii9234_deinit_resources(struct sii9234 *ctx)
873{
874 i2c_unregister_device(ctx->client[I2C_CBUS]);
875 i2c_unregister_device(ctx->client[I2C_HDMI]);
876 i2c_unregister_device(ctx->client[I2C_TPI]);
877}
878
879static inline struct sii9234 *bridge_to_sii9234(struct drm_bridge *bridge)
880{
881 return container_of(bridge, struct sii9234, bridge);
882}
883
884static enum drm_mode_status sii9234_mode_valid(struct drm_bridge *bridge,
885 const struct drm_display_mode *mode)
886{
887 if (mode->clock > MHL1_MAX_CLK)
888 return MODE_CLOCK_HIGH;
889
890 return MODE_OK;
891}
892
893static const struct drm_bridge_funcs sii9234_bridge_funcs = {
894 .mode_valid = sii9234_mode_valid,
895};
896
897static int sii9234_probe(struct i2c_client *client,
898 const struct i2c_device_id *id)
899{
900 struct i2c_adapter *adapter = client->adapter;
901 struct sii9234 *ctx;
902 struct device *dev = &client->dev;
903 int ret;
904
905 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
906 if (!ctx)
907 return -ENOMEM;
908
909 ctx->dev = dev;
910 mutex_init(&ctx->lock);
911
912 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
913 dev_err(dev, "I2C adapter lacks SMBUS feature\n");
914 return -EIO;
915 }
916
917 if (!client->irq) {
918 dev_err(dev, "no irq provided\n");
919 return -EINVAL;
920 }
921
922 irq_set_status_flags(client->irq, IRQ_NOAUTOEN);
923 ret = devm_request_threaded_irq(dev, client->irq, NULL,
924 sii9234_irq_thread,
925 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
926 "sii9234", ctx);
927 if (ret < 0) {
928 dev_err(dev, "failed to install IRQ handler\n");
929 return ret;
930 }
931
932 ret = sii9234_init_resources(ctx, client);
933 if (ret < 0)
934 return ret;
935
936 i2c_set_clientdata(client, ctx);
937
938 ctx->bridge.funcs = &sii9234_bridge_funcs;
939 ctx->bridge.of_node = dev->of_node;
940 drm_bridge_add(&ctx->bridge);
941
942 sii9234_cable_in(ctx);
943
944 return 0;
945}
946
947static int sii9234_remove(struct i2c_client *client)
948{
949 struct sii9234 *ctx = i2c_get_clientdata(client);
950
951 sii9234_cable_out(ctx);
952 drm_bridge_remove(&ctx->bridge);
953 sii9234_deinit_resources(ctx);
954
955 return 0;
956}
957
958static const struct of_device_id sii9234_dt_match[] = {
959 { .compatible = "sil,sii9234" },
960 { },
961};
962MODULE_DEVICE_TABLE(of, sii9234_dt_match);
963
964static const struct i2c_device_id sii9234_id[] = {
965 { "SII9234", 0 },
966 { },
967};
968MODULE_DEVICE_TABLE(i2c, sii9234_id);
969
970static struct i2c_driver sii9234_driver = {
971 .driver = {
972 .name = "sii9234",
973 .of_match_table = sii9234_dt_match,
974 },
975 .probe = sii9234_probe,
976 .remove = sii9234_remove,
977 .id_table = sii9234_id,
978};
979
980module_i2c_driver(sii9234_driver);
981MODULE_LICENSE("GPL");