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_bridge.h>
17 #include <drm/drm_crtc.h>
18 #include <drm/drm_edid.h>
19
20 #include <linux/delay.h>
21 #include <linux/err.h>
22 #include <linux/gpio/consumer.h>
23 #include <linux/i2c.h>
24 #include <linux/interrupt.h>
25 #include <linux/irq.h>
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/mutex.h>
29 #include <linux/regulator/consumer.h>
30 #include <linux/slab.h>
31
32 #define CBUS_DEVCAP_OFFSET 0x80
33
34 #define SII9234_MHL_VERSION 0x11
35 #define SII9234_SCRATCHPAD_SIZE 0x10
36 #define SII9234_INT_STAT_SIZE 0x33
37
38 #define BIT_TMDS_CCTRL_TMDS_OE BIT(4)
39 #define MHL_HPD_OUT_OVR_EN BIT(4)
40 #define MHL_HPD_OUT_OVR_VAL BIT(5)
41 #define MHL_INIT_TIMEOUT 0x0C
42
43 /* MHL Tx registers and bits */
44 #define MHL_TX_SRST 0x05
45 #define MHL_TX_SYSSTAT_REG 0x09
46 #define MHL_TX_INTR1_REG 0x71
47 #define MHL_TX_INTR4_REG 0x74
48 #define MHL_TX_INTR1_ENABLE_REG 0x75
49 #define MHL_TX_INTR4_ENABLE_REG 0x78
50 #define MHL_TX_INT_CTRL_REG 0x79
51 #define MHL_TX_TMDS_CCTRL 0x80
52 #define MHL_TX_DISC_CTRL1_REG 0x90
53 #define MHL_TX_DISC_CTRL2_REG 0x91
54 #define MHL_TX_DISC_CTRL3_REG 0x92
55 #define MHL_TX_DISC_CTRL4_REG 0x93
56 #define MHL_TX_DISC_CTRL5_REG 0x94
57 #define MHL_TX_DISC_CTRL6_REG 0x95
58 #define MHL_TX_DISC_CTRL7_REG 0x96
59 #define MHL_TX_DISC_CTRL8_REG 0x97
60 #define MHL_TX_STAT2_REG 0x99
61 #define MHL_TX_MHLTX_CTL1_REG 0xA0
62 #define MHL_TX_MHLTX_CTL2_REG 0xA1
63 #define MHL_TX_MHLTX_CTL4_REG 0xA3
64 #define MHL_TX_MHLTX_CTL6_REG 0xA5
65 #define MHL_TX_MHLTX_CTL7_REG 0xA6
66
67 #define RSEN_STATUS BIT(2)
68 #define HPD_CHANGE_INT BIT(6)
69 #define RSEN_CHANGE_INT BIT(5)
70 #define RGND_READY_INT BIT(6)
71 #define VBUS_LOW_INT BIT(5)
72 #define CBUS_LKOUT_INT BIT(4)
73 #define MHL_DISC_FAIL_INT BIT(3)
74 #define MHL_EST_INT BIT(2)
75 #define HPD_CHANGE_INT_MASK BIT(6)
76 #define RSEN_CHANGE_INT_MASK BIT(5)
77
78 #define RGND_READY_MASK BIT(6)
79 #define CBUS_LKOUT_MASK BIT(4)
80 #define MHL_DISC_FAIL_MASK BIT(3)
81 #define MHL_EST_MASK BIT(2)
82
83 #define SKIP_GND BIT(6)
84
85 #define ATT_THRESH_SHIFT 0x04
86 #define ATT_THRESH_MASK (0x03 << ATT_THRESH_SHIFT)
87 #define USB_D_OEN BIT(3)
88 #define DEGLITCH_TIME_MASK 0x07
89 #define DEGLITCH_TIME_2MS 0
90 #define DEGLITCH_TIME_4MS 1
91 #define DEGLITCH_TIME_8MS 2
92 #define DEGLITCH_TIME_16MS 3
93 #define DEGLITCH_TIME_40MS 4
94 #define DEGLITCH_TIME_50MS 5
95 #define DEGLITCH_TIME_60MS 6
96 #define DEGLITCH_TIME_128MS 7
97
98 #define USB_D_OVR BIT(7)
99 #define USB_ID_OVR BIT(6)
100 #define DVRFLT_SEL BIT(5)
101 #define BLOCK_RGND_INT BIT(4)
102 #define SKIP_DEG BIT(3)
103 #define CI2CA_POL BIT(2)
104 #define CI2CA_WKUP BIT(1)
105 #define SINGLE_ATT BIT(0)
106
107 #define USB_D_ODN BIT(5)
108 #define VBUS_CHECK BIT(2)
109 #define RGND_INTP_MASK 0x03
110 #define RGND_INTP_OPEN 0
111 #define RGND_INTP_2K 1
112 #define RGND_INTP_1K 2
113 #define RGND_INTP_SHORT 3
114
115 /* HDMI registers */
116 #define HDMI_RX_TMDS0_CCTRL1_REG 0x10
117 #define HDMI_RX_TMDS_CLK_EN_REG 0x11
118 #define HDMI_RX_TMDS_CH_EN_REG 0x12
119 #define HDMI_RX_PLL_CALREFSEL_REG 0x17
120 #define HDMI_RX_PLL_VCOCAL_REG 0x1A
121 #define HDMI_RX_EQ_DATA0_REG 0x22
122 #define HDMI_RX_EQ_DATA1_REG 0x23
123 #define HDMI_RX_EQ_DATA2_REG 0x24
124 #define HDMI_RX_EQ_DATA3_REG 0x25
125 #define HDMI_RX_EQ_DATA4_REG 0x26
126 #define HDMI_RX_TMDS_ZONE_CTRL_REG 0x4C
127 #define HDMI_RX_TMDS_MODE_CTRL_REG 0x4D
128
129 /* CBUS registers */
130 #define CBUS_INT_STATUS_1_REG 0x08
131 #define CBUS_INTR1_ENABLE_REG 0x09
132 #define CBUS_MSC_REQ_ABORT_REASON_REG 0x0D
133 #define CBUS_INT_STATUS_2_REG 0x1E
134 #define CBUS_INTR2_ENABLE_REG 0x1F
135 #define CBUS_LINK_CONTROL_2_REG 0x31
136 #define CBUS_MHL_STATUS_REG_0 0xB0
137 #define CBUS_MHL_STATUS_REG_1 0xB1
138
139 #define BIT_CBUS_RESET BIT(3)
140 #define SET_HPD_DOWNSTREAM BIT(6)
141
142 /* TPI registers */
143 #define TPI_DPD_REG 0x3D
144
145 /* Timeouts in msec */
146 #define T_SRC_VBUS_CBUS_TO_STABLE 200
147 #define T_SRC_CBUS_FLOAT 100
148 #define T_SRC_CBUS_DEGLITCH 2
149 #define T_SRC_RXSENSE_DEGLITCH 110
150
151 #define MHL1_MAX_CLK 75000 /* in kHz */
152
153 #define I2C_TPI_ADDR 0x3D
154 #define I2C_HDMI_ADDR 0x49
155 #define I2C_CBUS_ADDR 0x64
156
157 enum sii9234_state {
158 ST_OFF,
159 ST_D3,
160 ST_RGND_INIT,
161 ST_RGND_1K,
162 ST_RSEN_HIGH,
163 ST_MHL_ESTABLISHED,
164 ST_FAILURE_DISCOVERY,
165 ST_FAILURE,
166 };
167
168 struct sii9234 {
169 struct i2c_client *client[4];
170 struct drm_bridge bridge;
171 struct device *dev;
172 struct gpio_desc *gpio_reset;
173 int i2c_error;
174 struct regulator_bulk_data supplies[4];
175
176 struct mutex lock; /* Protects fields below and device registers */
177 enum sii9234_state state;
178 };
179
180 enum sii9234_client_id {
181 I2C_MHL,
182 I2C_TPI,
183 I2C_HDMI,
184 I2C_CBUS,
185 };
186
187 static const char * const sii9234_client_name[] = {
188 [I2C_MHL] = "MHL",
189 [I2C_TPI] = "TPI",
190 [I2C_HDMI] = "HDMI",
191 [I2C_CBUS] = "CBUS",
192 };
193
sii9234_writeb(struct sii9234 * ctx,int id,int offset,int value)194 static int sii9234_writeb(struct sii9234 *ctx, int id, int offset,
195 int value)
196 {
197 int ret;
198 struct i2c_client *client = ctx->client[id];
199
200 if (ctx->i2c_error)
201 return ctx->i2c_error;
202
203 ret = i2c_smbus_write_byte_data(client, offset, value);
204 if (ret < 0)
205 dev_err(ctx->dev, "writeb: %4s[0x%02x] <- 0x%02x\n",
206 sii9234_client_name[id], offset, value);
207 ctx->i2c_error = ret;
208
209 return ret;
210 }
211
sii9234_writebm(struct sii9234 * ctx,int id,int offset,int value,int mask)212 static int sii9234_writebm(struct sii9234 *ctx, int id, int offset,
213 int value, int mask)
214 {
215 int ret;
216 struct i2c_client *client = ctx->client[id];
217
218 if (ctx->i2c_error)
219 return ctx->i2c_error;
220
221 ret = i2c_smbus_write_byte(client, offset);
222 if (ret < 0) {
223 dev_err(ctx->dev, "writebm: %4s[0x%02x] <- 0x%02x\n",
224 sii9234_client_name[id], offset, value);
225 ctx->i2c_error = ret;
226 return ret;
227 }
228
229 ret = i2c_smbus_read_byte(client);
230 if (ret < 0) {
231 dev_err(ctx->dev, "writebm: %4s[0x%02x] <- 0x%02x\n",
232 sii9234_client_name[id], offset, value);
233 ctx->i2c_error = ret;
234 return ret;
235 }
236
237 value = (value & mask) | (ret & ~mask);
238
239 ret = i2c_smbus_write_byte_data(client, offset, value);
240 if (ret < 0) {
241 dev_err(ctx->dev, "writebm: %4s[0x%02x] <- 0x%02x\n",
242 sii9234_client_name[id], offset, value);
243 ctx->i2c_error = ret;
244 }
245
246 return ret;
247 }
248
sii9234_readb(struct sii9234 * ctx,int id,int offset)249 static int sii9234_readb(struct sii9234 *ctx, int id, int offset)
250 {
251 int ret;
252 struct i2c_client *client = ctx->client[id];
253
254 if (ctx->i2c_error)
255 return ctx->i2c_error;
256
257 ret = i2c_smbus_write_byte(client, offset);
258 if (ret < 0) {
259 dev_err(ctx->dev, "readb: %4s[0x%02x]\n",
260 sii9234_client_name[id], offset);
261 ctx->i2c_error = ret;
262 return ret;
263 }
264
265 ret = i2c_smbus_read_byte(client);
266 if (ret < 0) {
267 dev_err(ctx->dev, "readb: %4s[0x%02x]\n",
268 sii9234_client_name[id], offset);
269 ctx->i2c_error = ret;
270 }
271
272 return ret;
273 }
274
sii9234_clear_error(struct sii9234 * ctx)275 static int sii9234_clear_error(struct sii9234 *ctx)
276 {
277 int ret = ctx->i2c_error;
278
279 ctx->i2c_error = 0;
280
281 return ret;
282 }
283
284 #define mhl_tx_writeb(sii9234, offset, value) \
285 sii9234_writeb(sii9234, I2C_MHL, offset, value)
286 #define mhl_tx_writebm(sii9234, offset, value, mask) \
287 sii9234_writebm(sii9234, I2C_MHL, offset, value, mask)
288 #define mhl_tx_readb(sii9234, offset) \
289 sii9234_readb(sii9234, I2C_MHL, offset)
290 #define cbus_writeb(sii9234, offset, value) \
291 sii9234_writeb(sii9234, I2C_CBUS, offset, value)
292 #define cbus_writebm(sii9234, offset, value, mask) \
293 sii9234_writebm(sii9234, I2C_CBUS, offset, value, mask)
294 #define cbus_readb(sii9234, offset) \
295 sii9234_readb(sii9234, I2C_CBUS, offset)
296 #define hdmi_writeb(sii9234, offset, value) \
297 sii9234_writeb(sii9234, I2C_HDMI, offset, value)
298 #define hdmi_writebm(sii9234, offset, value, mask) \
299 sii9234_writebm(sii9234, I2C_HDMI, offset, value, mask)
300 #define hdmi_readb(sii9234, offset) \
301 sii9234_readb(sii9234, I2C_HDMI, offset)
302 #define tpi_writeb(sii9234, offset, value) \
303 sii9234_writeb(sii9234, I2C_TPI, offset, value)
304 #define tpi_writebm(sii9234, offset, value, mask) \
305 sii9234_writebm(sii9234, I2C_TPI, offset, value, mask)
306 #define tpi_readb(sii9234, offset) \
307 sii9234_readb(sii9234, I2C_TPI, offset)
308
sii9234_tmds_control(struct sii9234 * ctx,bool enable)309 static u8 sii9234_tmds_control(struct sii9234 *ctx, bool enable)
310 {
311 mhl_tx_writebm(ctx, MHL_TX_TMDS_CCTRL, enable ? ~0 : 0,
312 BIT_TMDS_CCTRL_TMDS_OE);
313 mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, enable ? ~0 : 0,
314 MHL_HPD_OUT_OVR_EN | MHL_HPD_OUT_OVR_VAL);
315 return sii9234_clear_error(ctx);
316 }
317
sii9234_cbus_reset(struct sii9234 * ctx)318 static int sii9234_cbus_reset(struct sii9234 *ctx)
319 {
320 int i;
321
322 mhl_tx_writebm(ctx, MHL_TX_SRST, ~0, BIT_CBUS_RESET);
323 msleep(T_SRC_CBUS_DEGLITCH);
324 mhl_tx_writebm(ctx, MHL_TX_SRST, 0, BIT_CBUS_RESET);
325
326 for (i = 0; i < 4; i++) {
327 /*
328 * Enable WRITE_STAT interrupt for writes to all
329 * 4 MSC Status registers.
330 */
331 cbus_writeb(ctx, 0xE0 + i, 0xF2);
332 /*
333 * Enable SET_INT interrupt for writes to all
334 * 4 MSC Interrupt registers.
335 */
336 cbus_writeb(ctx, 0xF0 + i, 0xF2);
337 }
338
339 return sii9234_clear_error(ctx);
340 }
341
342 /* Require to chek mhl imformation of samsung in cbus_init_register */
sii9234_cbus_init(struct sii9234 * ctx)343 static int sii9234_cbus_init(struct sii9234 *ctx)
344 {
345 cbus_writeb(ctx, 0x07, 0xF2);
346 cbus_writeb(ctx, 0x40, 0x03);
347 cbus_writeb(ctx, 0x42, 0x06);
348 cbus_writeb(ctx, 0x36, 0x0C);
349 cbus_writeb(ctx, 0x3D, 0xFD);
350 cbus_writeb(ctx, 0x1C, 0x01);
351 cbus_writeb(ctx, 0x1D, 0x0F);
352 cbus_writeb(ctx, 0x44, 0x02);
353 /* Setup our devcap */
354 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_DEV_STATE, 0x00);
355 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_MHL_VERSION,
356 SII9234_MHL_VERSION);
357 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_CAT,
358 MHL_DCAP_CAT_SOURCE);
359 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_ADOPTER_ID_H, 0x01);
360 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_ADOPTER_ID_L, 0x41);
361 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_VID_LINK_MODE,
362 MHL_DCAP_VID_LINK_RGB444 | MHL_DCAP_VID_LINK_YCBCR444);
363 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_VIDEO_TYPE,
364 MHL_DCAP_VT_GRAPHICS);
365 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_LOG_DEV_MAP,
366 MHL_DCAP_LD_GUI);
367 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_BANDWIDTH, 0x0F);
368 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_FEATURE_FLAG,
369 MHL_DCAP_FEATURE_RCP_SUPPORT | MHL_DCAP_FEATURE_RAP_SUPPORT
370 | MHL_DCAP_FEATURE_SP_SUPPORT);
371 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_DEVICE_ID_H, 0x0);
372 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_DEVICE_ID_L, 0x0);
373 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_SCRATCHPAD_SIZE,
374 SII9234_SCRATCHPAD_SIZE);
375 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_INT_STAT_SIZE,
376 SII9234_INT_STAT_SIZE);
377 cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_RESERVED, 0);
378 cbus_writebm(ctx, 0x31, 0x0C, 0x0C);
379 cbus_writeb(ctx, 0x30, 0x01);
380 cbus_writebm(ctx, 0x3C, 0x30, 0x38);
381 cbus_writebm(ctx, 0x22, 0x0D, 0x0F);
382 cbus_writebm(ctx, 0x2E, 0x15, 0x15);
383 cbus_writeb(ctx, CBUS_INTR1_ENABLE_REG, 0);
384 cbus_writeb(ctx, CBUS_INTR2_ENABLE_REG, 0);
385
386 return sii9234_clear_error(ctx);
387 }
388
force_usb_id_switch_open(struct sii9234 * ctx)389 static void force_usb_id_switch_open(struct sii9234 *ctx)
390 {
391 /* Disable CBUS discovery */
392 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, 0, 0x01);
393 /* Force USB ID switch to open */
394 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, ~0, USB_ID_OVR);
395 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL3_REG, ~0, 0x86);
396 /* Force upstream HPD to 0 when not in MHL mode. */
397 mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, 0, 0x30);
398 }
399
release_usb_id_switch_open(struct sii9234 * ctx)400 static void release_usb_id_switch_open(struct sii9234 *ctx)
401 {
402 msleep(T_SRC_CBUS_FLOAT);
403 /* Clear USB ID switch to open */
404 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, 0, USB_ID_OVR);
405 /* Enable CBUS discovery */
406 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, ~0, 0x01);
407 }
408
sii9234_power_init(struct sii9234 * ctx)409 static int sii9234_power_init(struct sii9234 *ctx)
410 {
411 /* Force the SiI9234 into the D0 state. */
412 tpi_writeb(ctx, TPI_DPD_REG, 0x3F);
413 /* Enable TxPLL Clock */
414 hdmi_writeb(ctx, HDMI_RX_TMDS_CLK_EN_REG, 0x01);
415 /* Enable Tx Clock Path & Equalizer */
416 hdmi_writeb(ctx, HDMI_RX_TMDS_CH_EN_REG, 0x15);
417 /* Power Up TMDS */
418 mhl_tx_writeb(ctx, 0x08, 0x35);
419 return sii9234_clear_error(ctx);
420 }
421
sii9234_hdmi_init(struct sii9234 * ctx)422 static int sii9234_hdmi_init(struct sii9234 *ctx)
423 {
424 hdmi_writeb(ctx, HDMI_RX_TMDS0_CCTRL1_REG, 0xC1);
425 hdmi_writeb(ctx, HDMI_RX_PLL_CALREFSEL_REG, 0x03);
426 hdmi_writeb(ctx, HDMI_RX_PLL_VCOCAL_REG, 0x20);
427 hdmi_writeb(ctx, HDMI_RX_EQ_DATA0_REG, 0x8A);
428 hdmi_writeb(ctx, HDMI_RX_EQ_DATA1_REG, 0x6A);
429 hdmi_writeb(ctx, HDMI_RX_EQ_DATA2_REG, 0xAA);
430 hdmi_writeb(ctx, HDMI_RX_EQ_DATA3_REG, 0xCA);
431 hdmi_writeb(ctx, HDMI_RX_EQ_DATA4_REG, 0xEA);
432 hdmi_writeb(ctx, HDMI_RX_TMDS_ZONE_CTRL_REG, 0xA0);
433 hdmi_writeb(ctx, HDMI_RX_TMDS_MODE_CTRL_REG, 0x00);
434 mhl_tx_writeb(ctx, MHL_TX_TMDS_CCTRL, 0x34);
435 hdmi_writeb(ctx, 0x45, 0x44);
436 hdmi_writeb(ctx, 0x31, 0x0A);
437 hdmi_writeb(ctx, HDMI_RX_TMDS0_CCTRL1_REG, 0xC1);
438
439 return sii9234_clear_error(ctx);
440 }
441
sii9234_mhl_tx_ctl_int(struct sii9234 * ctx)442 static int sii9234_mhl_tx_ctl_int(struct sii9234 *ctx)
443 {
444 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL1_REG, 0xD0);
445 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL2_REG, 0xFC);
446 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL4_REG, 0xEB);
447 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL7_REG, 0x0C);
448
449 return sii9234_clear_error(ctx);
450 }
451
sii9234_reset(struct sii9234 * ctx)452 static int sii9234_reset(struct sii9234 *ctx)
453 {
454 int ret;
455
456 sii9234_clear_error(ctx);
457
458 ret = sii9234_power_init(ctx);
459 if (ret < 0)
460 return ret;
461 ret = sii9234_cbus_reset(ctx);
462 if (ret < 0)
463 return ret;
464 ret = sii9234_hdmi_init(ctx);
465 if (ret < 0)
466 return ret;
467 ret = sii9234_mhl_tx_ctl_int(ctx);
468 if (ret < 0)
469 return ret;
470
471 /* Enable HDCP Compliance safety */
472 mhl_tx_writeb(ctx, 0x2B, 0x01);
473 /* CBUS discovery cycle time for each drive and float = 150us */
474 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, 0x04, 0x06);
475 /* Clear bit 6 (reg_skip_rgnd) */
476 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL2_REG, (1 << 7) /* Reserved */
477 | 2 << ATT_THRESH_SHIFT | DEGLITCH_TIME_50MS);
478 /*
479 * Changed from 66 to 65 for 94[1:0] = 01 = 5k reg_cbusmhl_pup_sel
480 * 1.8V CBUS VTH & GND threshold
481 * to meet CTS 3.3.7.2 spec
482 */
483 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL5_REG, 0x77);
484 cbus_writebm(ctx, CBUS_LINK_CONTROL_2_REG, ~0, MHL_INIT_TIMEOUT);
485 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL6_REG, 0xA0);
486 /* RGND & single discovery attempt (RGND blocking) */
487 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL6_REG, BLOCK_RGND_INT |
488 DVRFLT_SEL | SINGLE_ATT);
489 /* Use VBUS path of discovery state machine */
490 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL8_REG, 0);
491 /* 0x92[3] sets the CBUS / ID switch */
492 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, ~0, USB_ID_OVR);
493 /*
494 * To allow RGND engine to operate correctly.
495 * When moving the chip from D2 to D0 (power up, init regs)
496 * the values should be
497 * 94[1:0] = 01 reg_cbusmhl_pup_sel[1:0] should be set for 5k
498 * 93[7:6] = 10 reg_cbusdisc_pup_sel[1:0] should be
499 * set for 10k (default)
500 * 93[5:4] = 00 reg_cbusidle_pup_sel[1:0] = open (default)
501 */
502 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL3_REG, ~0, 0x86);
503 /*
504 * Change from CC to 8C to match 5K
505 * to meet CTS 3.3.72 spec
506 */
507 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL4_REG, ~0, 0x8C);
508 /* Configure the interrupt as active high */
509 mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, 0, 0x06);
510
511 msleep(25);
512
513 /* Release usb_id switch */
514 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, 0, USB_ID_OVR);
515 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL1_REG, 0x27);
516
517 ret = sii9234_clear_error(ctx);
518 if (ret < 0)
519 return ret;
520 ret = sii9234_cbus_init(ctx);
521 if (ret < 0)
522 return ret;
523
524 /* Enable Auto soft reset on SCDT = 0 */
525 mhl_tx_writeb(ctx, 0x05, 0x04);
526 /* HDMI Transcode mode enable */
527 mhl_tx_writeb(ctx, 0x0D, 0x1C);
528 mhl_tx_writeb(ctx, MHL_TX_INTR4_ENABLE_REG,
529 RGND_READY_MASK | CBUS_LKOUT_MASK
530 | MHL_DISC_FAIL_MASK | MHL_EST_MASK);
531 mhl_tx_writeb(ctx, MHL_TX_INTR1_ENABLE_REG, 0x60);
532
533 /* This point is very important before measure RGND impedance */
534 force_usb_id_switch_open(ctx);
535 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL4_REG, 0, 0xF0);
536 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL5_REG, 0, 0x03);
537 release_usb_id_switch_open(ctx);
538
539 /* Force upstream HPD to 0 when not in MHL mode */
540 mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, 0, 1 << 5);
541 mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, ~0, 1 << 4);
542
543 return sii9234_clear_error(ctx);
544 }
545
sii9234_goto_d3(struct sii9234 * ctx)546 static int sii9234_goto_d3(struct sii9234 *ctx)
547 {
548 int ret;
549
550 dev_dbg(ctx->dev, "sii9234: detection started d3\n");
551
552 ret = sii9234_reset(ctx);
553 if (ret < 0)
554 goto exit;
555
556 hdmi_writeb(ctx, 0x01, 0x03);
557 tpi_writebm(ctx, TPI_DPD_REG, 0, 1);
558 /* I2C above is expected to fail because power goes down */
559 sii9234_clear_error(ctx);
560
561 ctx->state = ST_D3;
562
563 return 0;
564 exit:
565 dev_err(ctx->dev, "%s failed\n", __func__);
566 return -1;
567 }
568
sii9234_hw_on(struct sii9234 * ctx)569 static int sii9234_hw_on(struct sii9234 *ctx)
570 {
571 return regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
572 }
573
sii9234_hw_off(struct sii9234 * ctx)574 static void sii9234_hw_off(struct sii9234 *ctx)
575 {
576 gpiod_set_value(ctx->gpio_reset, 1);
577 msleep(20);
578 regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
579 }
580
sii9234_hw_reset(struct sii9234 * ctx)581 static void sii9234_hw_reset(struct sii9234 *ctx)
582 {
583 gpiod_set_value(ctx->gpio_reset, 1);
584 msleep(20);
585 gpiod_set_value(ctx->gpio_reset, 0);
586 }
587
sii9234_cable_in(struct sii9234 * ctx)588 static void sii9234_cable_in(struct sii9234 *ctx)
589 {
590 int ret;
591
592 mutex_lock(&ctx->lock);
593 if (ctx->state != ST_OFF)
594 goto unlock;
595 ret = sii9234_hw_on(ctx);
596 if (ret < 0)
597 goto unlock;
598
599 sii9234_hw_reset(ctx);
600 sii9234_goto_d3(ctx);
601 /* To avoid irq storm, when hw is in meta state */
602 enable_irq(to_i2c_client(ctx->dev)->irq);
603
604 unlock:
605 mutex_unlock(&ctx->lock);
606 }
607
sii9234_cable_out(struct sii9234 * ctx)608 static void sii9234_cable_out(struct sii9234 *ctx)
609 {
610 mutex_lock(&ctx->lock);
611
612 if (ctx->state == ST_OFF)
613 goto unlock;
614
615 disable_irq(to_i2c_client(ctx->dev)->irq);
616 tpi_writeb(ctx, TPI_DPD_REG, 0);
617 /* Turn on&off hpd festure for only QCT HDMI */
618 sii9234_hw_off(ctx);
619
620 ctx->state = ST_OFF;
621
622 unlock:
623 mutex_unlock(&ctx->lock);
624 }
625
sii9234_rgnd_ready_irq(struct sii9234 * ctx)626 static enum sii9234_state sii9234_rgnd_ready_irq(struct sii9234 *ctx)
627 {
628 int value;
629
630 if (ctx->state == ST_D3) {
631 int ret;
632
633 dev_dbg(ctx->dev, "RGND_READY_INT\n");
634 sii9234_hw_reset(ctx);
635
636 ret = sii9234_reset(ctx);
637 if (ret < 0) {
638 dev_err(ctx->dev, "sii9234_reset() failed\n");
639 return ST_FAILURE;
640 }
641
642 return ST_RGND_INIT;
643 }
644
645 /* Got interrupt in inappropriate state */
646 if (ctx->state != ST_RGND_INIT)
647 return ST_FAILURE;
648
649 value = mhl_tx_readb(ctx, MHL_TX_STAT2_REG);
650 if (sii9234_clear_error(ctx))
651 return ST_FAILURE;
652
653 if ((value & RGND_INTP_MASK) != RGND_INTP_1K) {
654 dev_warn(ctx->dev, "RGND is not 1k\n");
655 return ST_RGND_INIT;
656 }
657 dev_dbg(ctx->dev, "RGND 1K!!\n");
658 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL4_REG, ~0, 0x8C);
659 mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL5_REG, 0x77);
660 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, ~0, 0x05);
661 if (sii9234_clear_error(ctx))
662 return ST_FAILURE;
663
664 msleep(T_SRC_VBUS_CBUS_TO_STABLE);
665 return ST_RGND_1K;
666 }
667
sii9234_mhl_established(struct sii9234 * ctx)668 static enum sii9234_state sii9234_mhl_established(struct sii9234 *ctx)
669 {
670 dev_dbg(ctx->dev, "mhl est interrupt\n");
671
672 /* Discovery override */
673 mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL1_REG, 0x10);
674 /* Increase DDC translation layer timer (byte mode) */
675 cbus_writeb(ctx, 0x07, 0x32);
676 cbus_writebm(ctx, 0x44, ~0, 1 << 1);
677 /* Keep the discovery enabled. Need RGND interrupt */
678 mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, ~0, 1);
679 mhl_tx_writeb(ctx, MHL_TX_INTR1_ENABLE_REG,
680 RSEN_CHANGE_INT_MASK | HPD_CHANGE_INT_MASK);
681
682 if (sii9234_clear_error(ctx))
683 return ST_FAILURE;
684
685 return ST_MHL_ESTABLISHED;
686 }
687
sii9234_hpd_change(struct sii9234 * ctx)688 static enum sii9234_state sii9234_hpd_change(struct sii9234 *ctx)
689 {
690 int value;
691
692 value = cbus_readb(ctx, CBUS_MSC_REQ_ABORT_REASON_REG);
693 if (sii9234_clear_error(ctx))
694 return ST_FAILURE;
695
696 if (value & SET_HPD_DOWNSTREAM) {
697 /* Downstream HPD High, Enable TMDS */
698 sii9234_tmds_control(ctx, true);
699 } else {
700 /* Downstream HPD Low, Disable TMDS */
701 sii9234_tmds_control(ctx, false);
702 }
703
704 return ctx->state;
705 }
706
sii9234_rsen_change(struct sii9234 * ctx)707 static enum sii9234_state sii9234_rsen_change(struct sii9234 *ctx)
708 {
709 int value;
710
711 /* Work_around code to handle wrong interrupt */
712 if (ctx->state != ST_RGND_1K) {
713 dev_err(ctx->dev, "RSEN_HIGH without RGND_1K\n");
714 return ST_FAILURE;
715 }
716 value = mhl_tx_readb(ctx, MHL_TX_SYSSTAT_REG);
717 if (value < 0)
718 return ST_FAILURE;
719
720 if (value & RSEN_STATUS) {
721 dev_dbg(ctx->dev, "MHL cable connected.. RSEN High\n");
722 return ST_RSEN_HIGH;
723 }
724 dev_dbg(ctx->dev, "RSEN lost\n");
725 /*
726 * Once RSEN loss is confirmed,we need to check
727 * based on cable status and chip power status,whether
728 * it is SINK Loss(HDMI cable not connected, TV Off)
729 * or MHL cable disconnection
730 * TODO: Define the below mhl_disconnection()
731 */
732 msleep(T_SRC_RXSENSE_DEGLITCH);
733 value = mhl_tx_readb(ctx, MHL_TX_SYSSTAT_REG);
734 if (value < 0)
735 return ST_FAILURE;
736 dev_dbg(ctx->dev, "sys_stat: %x\n", value);
737
738 if (value & RSEN_STATUS) {
739 dev_dbg(ctx->dev, "RSEN recovery\n");
740 return ST_RSEN_HIGH;
741 }
742 dev_dbg(ctx->dev, "RSEN Really LOW\n");
743 /* To meet CTS 3.3.22.2 spec */
744 sii9234_tmds_control(ctx, false);
745 force_usb_id_switch_open(ctx);
746 release_usb_id_switch_open(ctx);
747
748 return ST_FAILURE;
749 }
750
sii9234_irq_thread(int irq,void * data)751 static irqreturn_t sii9234_irq_thread(int irq, void *data)
752 {
753 struct sii9234 *ctx = data;
754 int intr1, intr4;
755 int intr1_en, intr4_en;
756 int cbus_intr1, cbus_intr2;
757
758 dev_dbg(ctx->dev, "%s\n", __func__);
759
760 mutex_lock(&ctx->lock);
761
762 intr1 = mhl_tx_readb(ctx, MHL_TX_INTR1_REG);
763 intr4 = mhl_tx_readb(ctx, MHL_TX_INTR4_REG);
764 intr1_en = mhl_tx_readb(ctx, MHL_TX_INTR1_ENABLE_REG);
765 intr4_en = mhl_tx_readb(ctx, MHL_TX_INTR4_ENABLE_REG);
766 cbus_intr1 = cbus_readb(ctx, CBUS_INT_STATUS_1_REG);
767 cbus_intr2 = cbus_readb(ctx, CBUS_INT_STATUS_2_REG);
768
769 if (sii9234_clear_error(ctx))
770 goto done;
771
772 dev_dbg(ctx->dev, "irq %02x/%02x %02x/%02x %02x/%02x\n",
773 intr1, intr1_en, intr4, intr4_en, cbus_intr1, cbus_intr2);
774
775 if (intr4 & RGND_READY_INT)
776 ctx->state = sii9234_rgnd_ready_irq(ctx);
777 if (intr1 & RSEN_CHANGE_INT)
778 ctx->state = sii9234_rsen_change(ctx);
779 if (intr4 & MHL_EST_INT)
780 ctx->state = sii9234_mhl_established(ctx);
781 if (intr1 & HPD_CHANGE_INT)
782 ctx->state = sii9234_hpd_change(ctx);
783 if (intr4 & CBUS_LKOUT_INT)
784 ctx->state = ST_FAILURE;
785 if (intr4 & MHL_DISC_FAIL_INT)
786 ctx->state = ST_FAILURE_DISCOVERY;
787
788 done:
789 /* Clean interrupt status and pending flags */
790 mhl_tx_writeb(ctx, MHL_TX_INTR1_REG, intr1);
791 mhl_tx_writeb(ctx, MHL_TX_INTR4_REG, intr4);
792 cbus_writeb(ctx, CBUS_MHL_STATUS_REG_0, 0xFF);
793 cbus_writeb(ctx, CBUS_MHL_STATUS_REG_1, 0xFF);
794 cbus_writeb(ctx, CBUS_INT_STATUS_1_REG, cbus_intr1);
795 cbus_writeb(ctx, CBUS_INT_STATUS_2_REG, cbus_intr2);
796
797 sii9234_clear_error(ctx);
798
799 if (ctx->state == ST_FAILURE) {
800 dev_dbg(ctx->dev, "try to reset after failure\n");
801 sii9234_hw_reset(ctx);
802 sii9234_goto_d3(ctx);
803 }
804
805 if (ctx->state == ST_FAILURE_DISCOVERY) {
806 dev_err(ctx->dev, "discovery failed, no power for MHL?\n");
807 tpi_writebm(ctx, TPI_DPD_REG, 0, 1);
808 ctx->state = ST_D3;
809 }
810
811 mutex_unlock(&ctx->lock);
812
813 return IRQ_HANDLED;
814 }
815
sii9234_init_resources(struct sii9234 * ctx,struct i2c_client * client)816 static int sii9234_init_resources(struct sii9234 *ctx,
817 struct i2c_client *client)
818 {
819 struct i2c_adapter *adapter = client->adapter;
820 int ret;
821
822 if (!ctx->dev->of_node) {
823 dev_err(ctx->dev, "not DT device\n");
824 return -ENODEV;
825 }
826
827 ctx->gpio_reset = devm_gpiod_get(ctx->dev, "reset", GPIOD_OUT_LOW);
828 if (IS_ERR(ctx->gpio_reset)) {
829 dev_err(ctx->dev, "failed to get reset gpio from DT\n");
830 return PTR_ERR(ctx->gpio_reset);
831 }
832
833 ctx->supplies[0].supply = "avcc12";
834 ctx->supplies[1].supply = "avcc33";
835 ctx->supplies[2].supply = "iovcc18";
836 ctx->supplies[3].supply = "cvcc12";
837 ret = devm_regulator_bulk_get(ctx->dev, 4, ctx->supplies);
838 if (ret) {
839 if (ret != -EPROBE_DEFER)
840 dev_err(ctx->dev, "regulator_bulk failed\n");
841 return ret;
842 }
843
844 ctx->client[I2C_MHL] = client;
845
846 ctx->client[I2C_TPI] = devm_i2c_new_dummy_device(&client->dev, adapter,
847 I2C_TPI_ADDR);
848 if (IS_ERR(ctx->client[I2C_TPI])) {
849 dev_err(ctx->dev, "failed to create TPI client\n");
850 return PTR_ERR(ctx->client[I2C_TPI]);
851 }
852
853 ctx->client[I2C_HDMI] = devm_i2c_new_dummy_device(&client->dev, adapter,
854 I2C_HDMI_ADDR);
855 if (IS_ERR(ctx->client[I2C_HDMI])) {
856 dev_err(ctx->dev, "failed to create HDMI RX client\n");
857 return PTR_ERR(ctx->client[I2C_HDMI]);
858 }
859
860 ctx->client[I2C_CBUS] = devm_i2c_new_dummy_device(&client->dev, adapter,
861 I2C_CBUS_ADDR);
862 if (IS_ERR(ctx->client[I2C_CBUS])) {
863 dev_err(ctx->dev, "failed to create CBUS client\n");
864 return PTR_ERR(ctx->client[I2C_CBUS]);
865 }
866
867 return 0;
868 }
869
bridge_to_sii9234(struct drm_bridge * bridge)870 static inline struct sii9234 *bridge_to_sii9234(struct drm_bridge *bridge)
871 {
872 return container_of(bridge, struct sii9234, bridge);
873 }
874
sii9234_mode_valid(struct drm_bridge * bridge,const struct drm_display_info * info,const struct drm_display_mode * mode)875 static enum drm_mode_status sii9234_mode_valid(struct drm_bridge *bridge,
876 const struct drm_display_info *info,
877 const struct drm_display_mode *mode)
878 {
879 if (mode->clock > MHL1_MAX_CLK)
880 return MODE_CLOCK_HIGH;
881
882 return MODE_OK;
883 }
884
885 static const struct drm_bridge_funcs sii9234_bridge_funcs = {
886 .mode_valid = sii9234_mode_valid,
887 };
888
sii9234_probe(struct i2c_client * client,const struct i2c_device_id * id)889 static int sii9234_probe(struct i2c_client *client,
890 const struct i2c_device_id *id)
891 {
892 struct i2c_adapter *adapter = client->adapter;
893 struct sii9234 *ctx;
894 struct device *dev = &client->dev;
895 int ret;
896
897 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
898 if (!ctx)
899 return -ENOMEM;
900
901 ctx->dev = dev;
902 mutex_init(&ctx->lock);
903
904 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
905 dev_err(dev, "I2C adapter lacks SMBUS feature\n");
906 return -EIO;
907 }
908
909 if (!client->irq) {
910 dev_err(dev, "no irq provided\n");
911 return -EINVAL;
912 }
913
914 irq_set_status_flags(client->irq, IRQ_NOAUTOEN);
915 ret = devm_request_threaded_irq(dev, client->irq, NULL,
916 sii9234_irq_thread,
917 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
918 "sii9234", ctx);
919 if (ret < 0) {
920 dev_err(dev, "failed to install IRQ handler\n");
921 return ret;
922 }
923
924 ret = sii9234_init_resources(ctx, client);
925 if (ret < 0)
926 return ret;
927
928 i2c_set_clientdata(client, ctx);
929
930 ctx->bridge.funcs = &sii9234_bridge_funcs;
931 ctx->bridge.of_node = dev->of_node;
932 drm_bridge_add(&ctx->bridge);
933
934 sii9234_cable_in(ctx);
935
936 return 0;
937 }
938
sii9234_remove(struct i2c_client * client)939 static void sii9234_remove(struct i2c_client *client)
940 {
941 struct sii9234 *ctx = i2c_get_clientdata(client);
942
943 sii9234_cable_out(ctx);
944 drm_bridge_remove(&ctx->bridge);
945 }
946
947 static const struct of_device_id sii9234_dt_match[] = {
948 { .compatible = "sil,sii9234" },
949 { },
950 };
951 MODULE_DEVICE_TABLE(of, sii9234_dt_match);
952
953 static const struct i2c_device_id sii9234_id[] = {
954 { "SII9234", 0 },
955 { },
956 };
957 MODULE_DEVICE_TABLE(i2c, sii9234_id);
958
959 static struct i2c_driver sii9234_driver = {
960 .driver = {
961 .name = "sii9234",
962 .of_match_table = sii9234_dt_match,
963 },
964 .probe = sii9234_probe,
965 .remove = sii9234_remove,
966 .id_table = sii9234_id,
967 };
968
969 module_i2c_driver(sii9234_driver);
970 MODULE_LICENSE("GPL");
971