1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright(c) 2016, Analogix Semiconductor.
5 * Based on anx7808 driver obtained from chromeos with copyright:
6 * Copyright(c) 2013, Google Inc.
8 #include <linux/delay.h>
10 #include <linux/gpio/consumer.h>
11 #include <linux/i2c.h>
12 #include <linux/interrupt.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/of_irq.h>
16 #include <linux/of_platform.h>
17 #include <linux/regmap.h>
18 #include <linux/regulator/consumer.h>
19 #include <linux/types.h>
21 #include <drm/drm_atomic_helper.h>
22 #include <drm/drm_bridge.h>
23 #include <drm/drm_crtc.h>
24 #include <drm/drm_dp_helper.h>
25 #include <drm/drm_edid.h>
26 #include <drm/drm_print.h>
27 #include <drm/drm_probe_helper.h>
29 #include "analogix-anx78xx.h"
31 #define I2C_NUM_ADDRESSES 5
32 #define I2C_IDX_TX_P0 0
33 #define I2C_IDX_TX_P1 1
34 #define I2C_IDX_TX_P2 2
35 #define I2C_IDX_RX_P0 3
36 #define I2C_IDX_RX_P1 4
38 #define XTAL_CLK 270 /* 27M */
40 static const u8 anx7808_i2c_addresses[] = {
41 [I2C_IDX_TX_P0] = 0x78,
42 [I2C_IDX_TX_P1] = 0x7a,
43 [I2C_IDX_TX_P2] = 0x72,
44 [I2C_IDX_RX_P0] = 0x7e,
45 [I2C_IDX_RX_P1] = 0x80,
48 static const u8 anx781x_i2c_addresses[] = {
49 [I2C_IDX_TX_P0] = 0x70,
50 [I2C_IDX_TX_P1] = 0x7a,
51 [I2C_IDX_TX_P2] = 0x72,
52 [I2C_IDX_RX_P0] = 0x7e,
53 [I2C_IDX_RX_P1] = 0x80,
56 struct anx78xx_platform_data {
57 struct regulator *dvdd10;
58 struct gpio_desc *gpiod_hpd;
59 struct gpio_desc *gpiod_pd;
60 struct gpio_desc *gpiod_reset;
67 struct drm_dp_aux aux;
68 struct drm_bridge bridge;
69 struct i2c_client *client;
71 struct drm_connector connector;
72 struct anx78xx_platform_data pdata;
76 * I2C Slave addresses of ANX7814 are mapped as TX_P0, TX_P1, TX_P2,
79 struct i2c_client *i2c_dummy[I2C_NUM_ADDRESSES];
80 struct regmap *map[I2C_NUM_ADDRESSES];
83 u8 dpcd[DP_RECEIVER_CAP_SIZE];
88 static inline struct anx78xx *connector_to_anx78xx(struct drm_connector *c)
90 return container_of(c, struct anx78xx, connector);
93 static inline struct anx78xx *bridge_to_anx78xx(struct drm_bridge *bridge)
95 return container_of(bridge, struct anx78xx, bridge);
98 static int anx78xx_set_bits(struct regmap *map, u8 reg, u8 mask)
100 return regmap_update_bits(map, reg, mask, mask);
103 static int anx78xx_clear_bits(struct regmap *map, u8 reg, u8 mask)
105 return regmap_update_bits(map, reg, mask, 0);
108 static ssize_t anx78xx_aux_transfer(struct drm_dp_aux *aux,
109 struct drm_dp_aux_msg *msg)
111 struct anx78xx *anx78xx = container_of(aux, struct anx78xx, aux);
112 return anx_dp_aux_transfer(anx78xx->map[I2C_IDX_TX_P0], msg);
115 static int anx78xx_set_hpd(struct anx78xx *anx78xx)
119 err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_RX_P0],
120 SP_TMDS_CTRL_BASE + 7, SP_PD_RT);
124 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P2], SP_VID_CTRL3_REG,
132 static int anx78xx_clear_hpd(struct anx78xx *anx78xx)
136 err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P2], SP_VID_CTRL3_REG,
141 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_RX_P0],
142 SP_TMDS_CTRL_BASE + 7, SP_PD_RT);
149 static const struct reg_sequence tmds_phy_initialization[] = {
150 { SP_TMDS_CTRL_BASE + 1, 0x90 },
151 { SP_TMDS_CTRL_BASE + 2, 0xa9 },
152 { SP_TMDS_CTRL_BASE + 6, 0x92 },
153 { SP_TMDS_CTRL_BASE + 7, 0x80 },
154 { SP_TMDS_CTRL_BASE + 20, 0xf2 },
155 { SP_TMDS_CTRL_BASE + 22, 0xc4 },
156 { SP_TMDS_CTRL_BASE + 23, 0x18 },
159 static int anx78xx_rx_initialization(struct anx78xx *anx78xx)
163 err = regmap_write(anx78xx->map[I2C_IDX_RX_P0], SP_HDMI_MUTE_CTRL_REG,
164 SP_AUD_MUTE | SP_VID_MUTE);
168 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_RX_P0], SP_CHIP_CTRL_REG,
169 SP_MAN_HDMI5V_DET | SP_PLLLOCK_CKDT_EN |
174 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_RX_P0],
175 SP_SOFTWARE_RESET1_REG, SP_HDCP_MAN_RST |
176 SP_SW_MAN_RST | SP_TMDS_RST | SP_VIDEO_RST);
180 err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_RX_P0],
181 SP_SOFTWARE_RESET1_REG, SP_HDCP_MAN_RST |
182 SP_SW_MAN_RST | SP_TMDS_RST | SP_VIDEO_RST);
186 /* Sync detect change, GP set mute */
187 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_RX_P0],
188 SP_AUD_EXCEPTION_ENABLE_BASE + 1, BIT(5) |
193 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_RX_P0],
194 SP_AUD_EXCEPTION_ENABLE_BASE + 3,
199 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_RX_P0], SP_AUDVID_CTRL_REG,
200 SP_AVC_EN | SP_AAC_OE | SP_AAC_EN);
204 err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_RX_P0],
205 SP_SYSTEM_POWER_DOWN1_REG, SP_PWDN_CTRL);
209 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_RX_P0],
210 SP_VID_DATA_RANGE_CTRL_REG, SP_R2Y_INPUT_LIMIT);
214 /* Enable DDC stretch */
215 err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
216 SP_DP_EXTRA_I2C_DEV_ADDR_REG, SP_I2C_EXTRA_ADDR);
220 /* TMDS phy initialization */
221 err = regmap_multi_reg_write(anx78xx->map[I2C_IDX_RX_P0],
222 tmds_phy_initialization,
223 ARRAY_SIZE(tmds_phy_initialization));
227 err = anx78xx_clear_hpd(anx78xx);
234 static const u8 dp_tx_output_precise_tune_bits[20] = {
235 0x01, 0x03, 0x07, 0x7f, 0x71, 0x6b, 0x7f,
236 0x73, 0x7f, 0x7f, 0x00, 0x00, 0x00, 0x00,
237 0x0c, 0x42, 0x1e, 0x3e, 0x72, 0x7e,
240 static int anx78xx_link_phy_initialization(struct anx78xx *anx78xx)
245 * REVISIT : It is writing to a RESERVED bits in Analog Control 0
248 err = regmap_write(anx78xx->map[I2C_IDX_TX_P2], SP_ANALOG_CTRL0_REG,
254 * Write DP TX output emphasis precise tune bits.
256 err = regmap_bulk_write(anx78xx->map[I2C_IDX_TX_P1],
257 SP_DP_TX_LT_CTRL0_REG,
258 dp_tx_output_precise_tune_bits,
259 ARRAY_SIZE(dp_tx_output_precise_tune_bits));
267 static int anx78xx_xtal_clk_sel(struct anx78xx *anx78xx)
272 err = regmap_update_bits(anx78xx->map[I2C_IDX_TX_P2],
273 SP_ANALOG_DEBUG2_REG,
274 SP_XTAL_FRQ | SP_FORCE_SW_OFF_BYPASS,
279 err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_DP_AUX_CH_CTRL3_REG,
280 XTAL_CLK & SP_WAIT_COUNTER_7_0_MASK);
284 err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_DP_AUX_CH_CTRL4_REG,
285 ((XTAL_CLK & 0xff00) >> 2) | (XTAL_CLK / 10));
289 err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
290 SP_I2C_GEN_10US_TIMER0_REG, XTAL_CLK & 0xff);
294 err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
295 SP_I2C_GEN_10US_TIMER1_REG,
296 (XTAL_CLK & 0xff00) >> 8);
300 err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_AUX_MISC_CTRL_REG,
305 err = regmap_read(anx78xx->map[I2C_IDX_RX_P0],
306 SP_HDMI_US_TIMER_CTRL_REG,
311 err = regmap_write(anx78xx->map[I2C_IDX_RX_P0],
312 SP_HDMI_US_TIMER_CTRL_REG,
313 (value & SP_MS_TIMER_MARGIN_10_8_MASK) |
314 ((((XTAL_CLK / 10) >> 1) - 2) << 3));
321 static const struct reg_sequence otp_key_protect[] = {
322 { SP_OTP_KEY_PROTECT1_REG, SP_OTP_PSW1 },
323 { SP_OTP_KEY_PROTECT2_REG, SP_OTP_PSW2 },
324 { SP_OTP_KEY_PROTECT3_REG, SP_OTP_PSW3 },
327 static int anx78xx_tx_initialization(struct anx78xx *anx78xx)
331 /* Set terminal resistor to 50 ohm */
332 err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_DP_AUX_CH_CTRL2_REG,
337 /* Enable aux double diff output */
338 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
339 SP_DP_AUX_CH_CTRL2_REG, 0x08);
343 err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P0],
344 SP_DP_HDCP_CTRL_REG, SP_AUTO_EN |
349 err = regmap_multi_reg_write(anx78xx->map[I2C_IDX_TX_P0],
351 ARRAY_SIZE(otp_key_protect));
355 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
356 SP_HDCP_KEY_COMMAND_REG, SP_DISABLE_SYNC_HDCP);
360 err = regmap_write(anx78xx->map[I2C_IDX_TX_P2], SP_VID_CTRL8_REG,
366 * DP HDCP auto authentication wait timer (when downstream starts to
367 * auth, DP side will wait for this period then do auth automatically)
369 err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_HDCP_AUTO_TIMER_REG,
374 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
375 SP_DP_HDCP_CTRL_REG, SP_LINK_POLLING);
379 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
380 SP_DP_LINK_DEBUG_CTRL_REG, SP_M_VID_DEBUG);
384 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P2],
385 SP_ANALOG_DEBUG2_REG, SP_POWERON_TIME_1P5MS);
389 err = anx78xx_xtal_clk_sel(anx78xx);
393 err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_AUX_DEFER_CTRL_REG,
394 SP_DEFER_CTRL_EN | 0x0c);
398 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
399 SP_DP_POLLING_CTRL_REG,
400 SP_AUTO_POLLING_DISABLE);
405 * Short the link integrity check timer to speed up bstatus
406 * polling for HDCP CTS item 1A-07
408 err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
409 SP_HDCP_LINK_CHECK_TIMER_REG, 0x1d);
413 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
414 SP_DP_MISC_CTRL_REG, SP_EQ_TRAINING_LOOP);
418 /* Power down the main link by default */
419 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
420 SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD);
424 err = anx78xx_link_phy_initialization(anx78xx);
428 /* Gen m_clk with downspreading */
429 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
430 SP_DP_M_CALCULATION_CTRL_REG, SP_M_GEN_CLK_SEL);
437 static int anx78xx_enable_interrupts(struct anx78xx *anx78xx)
442 * BIT0: INT pin assertion polarity: 1 = assert high
443 * BIT1: INT pin output type: 0 = push/pull
445 err = regmap_write(anx78xx->map[I2C_IDX_TX_P2], SP_INT_CTRL_REG, 0x01);
449 err = regmap_write(anx78xx->map[I2C_IDX_TX_P2],
450 SP_COMMON_INT_MASK4_REG, SP_HPD_LOST | SP_HPD_PLUG);
454 err = regmap_write(anx78xx->map[I2C_IDX_TX_P2], SP_DP_INT_MASK1_REG,
459 err = regmap_write(anx78xx->map[I2C_IDX_RX_P0], SP_INT_MASK1_REG,
460 SP_CKDT_CHG | SP_SCDT_CHG);
467 static void anx78xx_poweron(struct anx78xx *anx78xx)
469 struct anx78xx_platform_data *pdata = &anx78xx->pdata;
472 if (WARN_ON(anx78xx->powered))
476 err = regulator_enable(pdata->dvdd10);
478 DRM_ERROR("Failed to enable DVDD10 regulator: %d\n",
483 usleep_range(1000, 2000);
486 gpiod_set_value_cansleep(pdata->gpiod_reset, 1);
487 usleep_range(1000, 2000);
489 gpiod_set_value_cansleep(pdata->gpiod_pd, 0);
490 usleep_range(1000, 2000);
492 gpiod_set_value_cansleep(pdata->gpiod_reset, 0);
494 /* Power on registers module */
495 anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P2], SP_POWERDOWN_CTRL_REG,
496 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
497 anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P2], SP_POWERDOWN_CTRL_REG,
498 SP_REGISTER_PD | SP_TOTAL_PD);
500 anx78xx->powered = true;
503 static void anx78xx_poweroff(struct anx78xx *anx78xx)
505 struct anx78xx_platform_data *pdata = &anx78xx->pdata;
508 if (WARN_ON(!anx78xx->powered))
511 gpiod_set_value_cansleep(pdata->gpiod_reset, 1);
512 usleep_range(1000, 2000);
514 gpiod_set_value_cansleep(pdata->gpiod_pd, 1);
515 usleep_range(1000, 2000);
518 err = regulator_disable(pdata->dvdd10);
520 DRM_ERROR("Failed to disable DVDD10 regulator: %d\n",
525 usleep_range(1000, 2000);
528 anx78xx->powered = false;
531 static int anx78xx_start(struct anx78xx *anx78xx)
535 /* Power on all modules */
536 err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P2],
537 SP_POWERDOWN_CTRL_REG,
538 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD |
541 err = anx78xx_enable_interrupts(anx78xx);
543 DRM_ERROR("Failed to enable interrupts: %d\n", err);
547 err = anx78xx_rx_initialization(anx78xx);
549 DRM_ERROR("Failed receiver initialization: %d\n", err);
553 err = anx78xx_tx_initialization(anx78xx);
555 DRM_ERROR("Failed transmitter initialization: %d\n", err);
560 * This delay seems to help keep the hardware in a good state. Without
561 * it, there are times where it fails silently.
563 usleep_range(10000, 15000);
568 DRM_ERROR("Failed SlimPort transmitter initialization: %d\n", err);
569 anx78xx_poweroff(anx78xx);
574 static int anx78xx_init_pdata(struct anx78xx *anx78xx)
576 struct anx78xx_platform_data *pdata = &anx78xx->pdata;
577 struct device *dev = &anx78xx->client->dev;
579 /* 1.0V digital core power regulator */
580 pdata->dvdd10 = devm_regulator_get(dev, "dvdd10");
581 if (IS_ERR(pdata->dvdd10)) {
582 if (PTR_ERR(pdata->dvdd10) != -EPROBE_DEFER)
583 DRM_ERROR("DVDD10 regulator not found\n");
585 return PTR_ERR(pdata->dvdd10);
589 pdata->gpiod_hpd = devm_gpiod_get(dev, "hpd", GPIOD_IN);
590 if (IS_ERR(pdata->gpiod_hpd))
591 return PTR_ERR(pdata->gpiod_hpd);
593 /* GPIO for chip power down */
594 pdata->gpiod_pd = devm_gpiod_get(dev, "pd", GPIOD_OUT_HIGH);
595 if (IS_ERR(pdata->gpiod_pd))
596 return PTR_ERR(pdata->gpiod_pd);
598 /* GPIO for chip reset */
599 pdata->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
601 return PTR_ERR_OR_ZERO(pdata->gpiod_reset);
604 static int anx78xx_dp_link_training(struct anx78xx *anx78xx)
609 err = regmap_write(anx78xx->map[I2C_IDX_RX_P0], SP_HDMI_MUTE_CTRL_REG,
614 err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P2],
615 SP_POWERDOWN_CTRL_REG,
620 err = drm_dp_dpcd_readb(&anx78xx->aux, DP_MAX_LINK_RATE, &dp_bw);
625 case DP_LINK_BW_1_62:
631 DRM_DEBUG_KMS("DP bandwidth (%#02x) not supported\n", dp_bw);
635 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P2], SP_VID_CTRL1_REG,
640 err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P2],
641 SP_VID_CTRL1_REG, SP_VIDEO_EN);
646 err = drm_dp_dpcd_read(&anx78xx->aux, DP_DPCD_REV,
647 &anx78xx->dpcd, DP_RECEIVER_CAP_SIZE);
649 DRM_ERROR("Failed to read DPCD: %d\n", err);
653 /* Clear channel x SERDES power down */
654 err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P0],
655 SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD);
660 * Power up the sink (DP_SET_POWER register is only available on DPCD
663 if (anx78xx->dpcd[DP_DPCD_REV] >= 0x11) {
664 err = drm_dp_dpcd_readb(&anx78xx->aux, DP_SET_POWER, &dpcd[0]);
666 DRM_ERROR("Failed to read DP_SET_POWER register: %d\n",
671 dpcd[0] &= ~DP_SET_POWER_MASK;
672 dpcd[0] |= DP_SET_POWER_D0;
674 err = drm_dp_dpcd_writeb(&anx78xx->aux, DP_SET_POWER, dpcd[0]);
676 DRM_ERROR("Failed to power up DisplayPort link: %d\n",
682 * According to the DP 1.1 specification, a "Sink Device must
683 * exit the power saving state within 1 ms" (Section 2.5.3.1,
684 * Table 5-52, "Sink Control Field" (register 0x600).
686 usleep_range(1000, 2000);
689 /* Possibly enable downspread on the sink */
690 err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
691 SP_DP_DOWNSPREAD_CTRL1_REG, 0);
695 if (anx78xx->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) {
696 DRM_DEBUG("Enable downspread on the sink\n");
698 err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
699 SP_DP_DOWNSPREAD_CTRL1_REG, 8);
703 err = drm_dp_dpcd_writeb(&anx78xx->aux, DP_DOWNSPREAD_CTRL,
708 err = drm_dp_dpcd_writeb(&anx78xx->aux, DP_DOWNSPREAD_CTRL, 0);
713 /* Set the lane count and the link rate on the sink */
714 if (drm_dp_enhanced_frame_cap(anx78xx->dpcd))
715 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
716 SP_DP_SYSTEM_CTRL_BASE + 4,
719 err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P0],
720 SP_DP_SYSTEM_CTRL_BASE + 4,
725 err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
726 SP_DP_MAIN_LINK_BW_SET_REG,
727 anx78xx->dpcd[DP_MAX_LINK_RATE]);
731 dpcd[1] = drm_dp_max_lane_count(anx78xx->dpcd);
733 if (drm_dp_enhanced_frame_cap(anx78xx->dpcd))
734 dpcd[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
736 err = drm_dp_dpcd_write(&anx78xx->aux, DP_LINK_BW_SET, dpcd,
739 DRM_ERROR("Failed to configure link: %d\n", err);
743 /* Start training on the source */
744 err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_DP_LT_CTRL_REG,
752 static int anx78xx_config_dp_output(struct anx78xx *anx78xx)
756 err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P2], SP_VID_CTRL1_REG,
761 /* Enable DP output */
762 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P2], SP_VID_CTRL1_REG,
770 static int anx78xx_send_video_infoframe(struct anx78xx *anx78xx,
771 struct hdmi_avi_infoframe *frame)
773 u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_AVI_INFOFRAME_SIZE];
776 err = hdmi_avi_infoframe_pack(frame, buffer, sizeof(buffer));
778 DRM_ERROR("Failed to pack AVI infoframe: %d\n", err);
782 err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P0],
783 SP_PACKET_SEND_CTRL_REG, SP_AVI_IF_EN);
787 err = regmap_bulk_write(anx78xx->map[I2C_IDX_TX_P2],
788 SP_INFOFRAME_AVI_DB1_REG, buffer,
793 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
794 SP_PACKET_SEND_CTRL_REG, SP_AVI_IF_UD);
798 err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
799 SP_PACKET_SEND_CTRL_REG, SP_AVI_IF_EN);
806 static int anx78xx_get_downstream_info(struct anx78xx *anx78xx)
811 err = drm_dp_dpcd_readb(&anx78xx->aux, DP_SINK_COUNT, &value);
813 DRM_ERROR("Get sink count failed %d\n", err);
817 if (!DP_GET_SINK_COUNT(value)) {
818 DRM_ERROR("Downstream disconnected\n");
825 static int anx78xx_get_modes(struct drm_connector *connector)
827 struct anx78xx *anx78xx = connector_to_anx78xx(connector);
828 int err, num_modes = 0;
830 if (WARN_ON(!anx78xx->powered))
834 return drm_add_edid_modes(connector, anx78xx->edid);
836 mutex_lock(&anx78xx->lock);
838 err = anx78xx_get_downstream_info(anx78xx);
840 DRM_ERROR("Failed to get downstream info: %d\n", err);
844 anx78xx->edid = drm_get_edid(connector, &anx78xx->aux.ddc);
845 if (!anx78xx->edid) {
846 DRM_ERROR("Failed to read EDID\n");
850 err = drm_connector_update_edid_property(connector,
853 DRM_ERROR("Failed to update EDID property: %d\n", err);
857 num_modes = drm_add_edid_modes(connector, anx78xx->edid);
860 mutex_unlock(&anx78xx->lock);
865 static const struct drm_connector_helper_funcs anx78xx_connector_helper_funcs = {
866 .get_modes = anx78xx_get_modes,
869 static enum drm_connector_status anx78xx_detect(struct drm_connector *connector,
872 struct anx78xx *anx78xx = connector_to_anx78xx(connector);
874 if (!gpiod_get_value(anx78xx->pdata.gpiod_hpd))
875 return connector_status_disconnected;
877 return connector_status_connected;
880 static const struct drm_connector_funcs anx78xx_connector_funcs = {
881 .fill_modes = drm_helper_probe_single_connector_modes,
882 .detect = anx78xx_detect,
883 .destroy = drm_connector_cleanup,
884 .reset = drm_atomic_helper_connector_reset,
885 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
886 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
889 static int anx78xx_bridge_attach(struct drm_bridge *bridge,
890 enum drm_bridge_attach_flags flags)
892 struct anx78xx *anx78xx = bridge_to_anx78xx(bridge);
895 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
896 DRM_ERROR("Fix bridge driver to make connector optional!");
900 if (!bridge->encoder) {
901 DRM_ERROR("Parent encoder object not found");
905 /* Register aux channel */
906 anx78xx->aux.name = "DP-AUX";
907 anx78xx->aux.dev = &anx78xx->client->dev;
908 anx78xx->aux.transfer = anx78xx_aux_transfer;
910 err = drm_dp_aux_register(&anx78xx->aux);
912 DRM_ERROR("Failed to register aux channel: %d\n", err);
916 err = drm_connector_init(bridge->dev, &anx78xx->connector,
917 &anx78xx_connector_funcs,
918 DRM_MODE_CONNECTOR_DisplayPort);
920 DRM_ERROR("Failed to initialize connector: %d\n", err);
924 drm_connector_helper_add(&anx78xx->connector,
925 &anx78xx_connector_helper_funcs);
927 err = drm_connector_register(&anx78xx->connector);
929 DRM_ERROR("Failed to register connector: %d\n", err);
933 anx78xx->connector.polled = DRM_CONNECTOR_POLL_HPD;
935 err = drm_connector_attach_encoder(&anx78xx->connector,
938 DRM_ERROR("Failed to link up connector to encoder: %d\n", err);
945 static enum drm_mode_status
946 anx78xx_bridge_mode_valid(struct drm_bridge *bridge,
947 const struct drm_display_info *info,
948 const struct drm_display_mode *mode)
950 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
951 return MODE_NO_INTERLACE;
953 /* Max 1200p at 5.4 Ghz, one lane */
954 if (mode->clock > 154000)
955 return MODE_CLOCK_HIGH;
960 static void anx78xx_bridge_disable(struct drm_bridge *bridge)
962 struct anx78xx *anx78xx = bridge_to_anx78xx(bridge);
964 /* Power off all modules except configuration registers access */
965 anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P2], SP_POWERDOWN_CTRL_REG,
966 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
969 static void anx78xx_bridge_mode_set(struct drm_bridge *bridge,
970 const struct drm_display_mode *mode,
971 const struct drm_display_mode *adjusted_mode)
973 struct anx78xx *anx78xx = bridge_to_anx78xx(bridge);
974 struct hdmi_avi_infoframe frame;
977 if (WARN_ON(!anx78xx->powered))
980 mutex_lock(&anx78xx->lock);
982 err = drm_hdmi_avi_infoframe_from_display_mode(&frame,
986 DRM_ERROR("Failed to setup AVI infoframe: %d\n", err);
990 err = anx78xx_send_video_infoframe(anx78xx, &frame);
992 DRM_ERROR("Failed to send AVI infoframe: %d\n", err);
995 mutex_unlock(&anx78xx->lock);
998 static void anx78xx_bridge_enable(struct drm_bridge *bridge)
1000 struct anx78xx *anx78xx = bridge_to_anx78xx(bridge);
1003 err = anx78xx_start(anx78xx);
1005 DRM_ERROR("Failed to initialize: %d\n", err);
1009 err = anx78xx_set_hpd(anx78xx);
1011 DRM_ERROR("Failed to set HPD: %d\n", err);
1014 static const struct drm_bridge_funcs anx78xx_bridge_funcs = {
1015 .attach = anx78xx_bridge_attach,
1016 .mode_valid = anx78xx_bridge_mode_valid,
1017 .disable = anx78xx_bridge_disable,
1018 .mode_set = anx78xx_bridge_mode_set,
1019 .enable = anx78xx_bridge_enable,
1022 static irqreturn_t anx78xx_hpd_threaded_handler(int irq, void *data)
1024 struct anx78xx *anx78xx = data;
1027 if (anx78xx->powered)
1030 mutex_lock(&anx78xx->lock);
1032 /* Cable is pulled, power on the chip */
1033 anx78xx_poweron(anx78xx);
1035 err = anx78xx_enable_interrupts(anx78xx);
1037 DRM_ERROR("Failed to enable interrupts: %d\n", err);
1039 mutex_unlock(&anx78xx->lock);
1044 static int anx78xx_handle_dp_int_1(struct anx78xx *anx78xx, u8 irq)
1048 DRM_DEBUG_KMS("Handle DP interrupt 1: %02x\n", irq);
1050 err = regmap_write(anx78xx->map[I2C_IDX_TX_P2], SP_DP_INT_STATUS1_REG,
1055 if (irq & SP_TRAINING_FINISH) {
1056 DRM_DEBUG_KMS("IRQ: hardware link training finished\n");
1057 err = anx78xx_config_dp_output(anx78xx);
1063 static bool anx78xx_handle_common_int_4(struct anx78xx *anx78xx, u8 irq)
1068 DRM_DEBUG_KMS("Handle common interrupt 4: %02x\n", irq);
1070 err = regmap_write(anx78xx->map[I2C_IDX_TX_P2],
1071 SP_COMMON_INT_STATUS4_REG, irq);
1073 DRM_ERROR("Failed to write SP_COMMON_INT_STATUS4 %d\n", err);
1077 if (irq & SP_HPD_LOST) {
1078 DRM_DEBUG_KMS("IRQ: Hot plug detect - cable is pulled out\n");
1080 anx78xx_poweroff(anx78xx);
1081 /* Free cached EDID */
1082 kfree(anx78xx->edid);
1083 anx78xx->edid = NULL;
1084 } else if (irq & SP_HPD_PLUG) {
1085 DRM_DEBUG_KMS("IRQ: Hot plug detect - cable plug\n");
1092 static void anx78xx_handle_hdmi_int_1(struct anx78xx *anx78xx, u8 irq)
1097 DRM_DEBUG_KMS("Handle HDMI interrupt 1: %02x\n", irq);
1099 err = regmap_write(anx78xx->map[I2C_IDX_RX_P0], SP_INT_STATUS1_REG,
1102 DRM_ERROR("Write HDMI int 1 failed: %d\n", err);
1106 if ((irq & SP_CKDT_CHG) || (irq & SP_SCDT_CHG)) {
1107 DRM_DEBUG_KMS("IRQ: HDMI input detected\n");
1109 err = regmap_read(anx78xx->map[I2C_IDX_RX_P0],
1110 SP_SYSTEM_STATUS_REG, &value);
1112 DRM_ERROR("Read system status reg failed: %d\n", err);
1116 if (!(value & SP_TMDS_CLOCK_DET)) {
1117 DRM_DEBUG_KMS("IRQ: *** Waiting for HDMI clock ***\n");
1121 if (!(value & SP_TMDS_DE_DET)) {
1122 DRM_DEBUG_KMS("IRQ: *** Waiting for HDMI signal ***\n");
1126 err = anx78xx_dp_link_training(anx78xx);
1128 DRM_ERROR("Failed to start link training: %d\n", err);
1132 static irqreturn_t anx78xx_intp_threaded_handler(int unused, void *data)
1134 struct anx78xx *anx78xx = data;
1139 mutex_lock(&anx78xx->lock);
1141 err = regmap_read(anx78xx->map[I2C_IDX_TX_P2], SP_DP_INT_STATUS1_REG,
1144 DRM_ERROR("Failed to read DP interrupt 1 status: %d\n", err);
1149 anx78xx_handle_dp_int_1(anx78xx, irq);
1151 err = regmap_read(anx78xx->map[I2C_IDX_TX_P2],
1152 SP_COMMON_INT_STATUS4_REG, &irq);
1154 DRM_ERROR("Failed to read common interrupt 4 status: %d\n",
1160 event = anx78xx_handle_common_int_4(anx78xx, irq);
1162 /* Make sure we are still powered after handle HPD events */
1163 if (!anx78xx->powered)
1166 err = regmap_read(anx78xx->map[I2C_IDX_RX_P0], SP_INT_STATUS1_REG,
1169 DRM_ERROR("Failed to read HDMI int 1 status: %d\n", err);
1174 anx78xx_handle_hdmi_int_1(anx78xx, irq);
1177 mutex_unlock(&anx78xx->lock);
1180 drm_helper_hpd_irq_event(anx78xx->connector.dev);
1185 static void unregister_i2c_dummy_clients(struct anx78xx *anx78xx)
1189 for (i = 0; i < ARRAY_SIZE(anx78xx->i2c_dummy); i++)
1190 i2c_unregister_device(anx78xx->i2c_dummy[i]);
1193 static const struct regmap_config anx78xx_regmap_config = {
1198 static const u16 anx78xx_chipid_list[] = {
1205 static int anx78xx_i2c_probe(struct i2c_client *client,
1206 const struct i2c_device_id *id)
1208 struct anx78xx *anx78xx;
1209 struct anx78xx_platform_data *pdata;
1210 unsigned int i, idl, idh, version;
1211 const u8 *i2c_addresses;
1215 anx78xx = devm_kzalloc(&client->dev, sizeof(*anx78xx), GFP_KERNEL);
1219 pdata = &anx78xx->pdata;
1221 mutex_init(&anx78xx->lock);
1223 #if IS_ENABLED(CONFIG_OF)
1224 anx78xx->bridge.of_node = client->dev.of_node;
1227 anx78xx->client = client;
1228 i2c_set_clientdata(client, anx78xx);
1230 err = anx78xx_init_pdata(anx78xx);
1232 if (err != -EPROBE_DEFER)
1233 DRM_ERROR("Failed to initialize pdata: %d\n", err);
1238 pdata->hpd_irq = gpiod_to_irq(pdata->gpiod_hpd);
1239 if (pdata->hpd_irq < 0) {
1240 DRM_ERROR("Failed to get HPD IRQ: %d\n", pdata->hpd_irq);
1244 pdata->intp_irq = client->irq;
1245 if (!pdata->intp_irq) {
1246 DRM_ERROR("Failed to get CABLE_DET and INTP IRQ\n");
1250 /* Map slave addresses of ANX7814 */
1251 i2c_addresses = device_get_match_data(&client->dev);
1252 for (i = 0; i < I2C_NUM_ADDRESSES; i++) {
1253 struct i2c_client *i2c_dummy;
1255 i2c_dummy = i2c_new_dummy_device(client->adapter,
1256 i2c_addresses[i] >> 1);
1257 if (IS_ERR(i2c_dummy)) {
1258 err = PTR_ERR(i2c_dummy);
1259 DRM_ERROR("Failed to reserve I2C bus %02x: %d\n",
1260 i2c_addresses[i], err);
1261 goto err_unregister_i2c;
1264 anx78xx->i2c_dummy[i] = i2c_dummy;
1265 anx78xx->map[i] = devm_regmap_init_i2c(anx78xx->i2c_dummy[i],
1266 &anx78xx_regmap_config);
1267 if (IS_ERR(anx78xx->map[i])) {
1268 err = PTR_ERR(anx78xx->map[i]);
1269 DRM_ERROR("Failed regmap initialization %02x\n",
1271 goto err_unregister_i2c;
1275 /* Look for supported chip ID */
1276 anx78xx_poweron(anx78xx);
1278 err = regmap_read(anx78xx->map[I2C_IDX_TX_P2], SP_DEVICE_IDL_REG,
1283 err = regmap_read(anx78xx->map[I2C_IDX_TX_P2], SP_DEVICE_IDH_REG,
1288 anx78xx->chipid = (u8)idl | ((u8)idh << 8);
1290 err = regmap_read(anx78xx->map[I2C_IDX_TX_P2], SP_DEVICE_VERSION_REG,
1295 for (i = 0; i < ARRAY_SIZE(anx78xx_chipid_list); i++) {
1296 if (anx78xx->chipid == anx78xx_chipid_list[i]) {
1297 DRM_INFO("Found ANX%x (ver. %d) SlimPort Transmitter\n",
1298 anx78xx->chipid, version);
1305 DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n",
1306 anx78xx->chipid, version);
1311 err = devm_request_threaded_irq(&client->dev, pdata->hpd_irq, NULL,
1312 anx78xx_hpd_threaded_handler,
1313 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
1314 "anx78xx-hpd", anx78xx);
1316 DRM_ERROR("Failed to request CABLE_DET threaded IRQ: %d\n",
1321 err = devm_request_threaded_irq(&client->dev, pdata->intp_irq, NULL,
1322 anx78xx_intp_threaded_handler,
1323 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
1324 "anx78xx-intp", anx78xx);
1326 DRM_ERROR("Failed to request INTP threaded IRQ: %d\n", err);
1330 anx78xx->bridge.funcs = &anx78xx_bridge_funcs;
1332 drm_bridge_add(&anx78xx->bridge);
1334 /* If cable is pulled out, just poweroff and wait for HPD event */
1335 if (!gpiod_get_value(anx78xx->pdata.gpiod_hpd))
1336 anx78xx_poweroff(anx78xx);
1341 anx78xx_poweroff(anx78xx);
1344 unregister_i2c_dummy_clients(anx78xx);
1348 static int anx78xx_i2c_remove(struct i2c_client *client)
1350 struct anx78xx *anx78xx = i2c_get_clientdata(client);
1352 drm_bridge_remove(&anx78xx->bridge);
1354 unregister_i2c_dummy_clients(anx78xx);
1356 kfree(anx78xx->edid);
1361 static const struct i2c_device_id anx78xx_id[] = {
1365 MODULE_DEVICE_TABLE(i2c, anx78xx_id);
1367 #if IS_ENABLED(CONFIG_OF)
1368 static const struct of_device_id anx78xx_match_table[] = {
1369 { .compatible = "analogix,anx7808", .data = anx7808_i2c_addresses },
1370 { .compatible = "analogix,anx7812", .data = anx781x_i2c_addresses },
1371 { .compatible = "analogix,anx7814", .data = anx781x_i2c_addresses },
1372 { .compatible = "analogix,anx7818", .data = anx781x_i2c_addresses },
1375 MODULE_DEVICE_TABLE(of, anx78xx_match_table);
1378 static struct i2c_driver anx78xx_driver = {
1381 .of_match_table = of_match_ptr(anx78xx_match_table),
1383 .probe = anx78xx_i2c_probe,
1384 .remove = anx78xx_i2c_remove,
1385 .id_table = anx78xx_id,
1387 module_i2c_driver(anx78xx_driver);
1389 MODULE_DESCRIPTION("ANX78xx SlimPort Transmitter driver");
1391 MODULE_LICENSE("GPL v2");