1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright(c) 2016, Analogix Semiconductor.
4 * Copyright(c) 2017, Icenowy Zheng <icenowy@aosc.io>
6 * Based on anx7808 driver obtained from chromeos with copyright:
7 * Copyright(c) 2013, Google Inc.
9 #include <linux/delay.h>
10 #include <linux/err.h>
11 #include <linux/gpio/consumer.h>
12 #include <linux/i2c.h>
13 #include <linux/interrupt.h>
14 #include <linux/kernel.h>
15 #include <linux/module.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_crtc_helper.h>
25 #include <drm/drm_dp_helper.h>
26 #include <drm/drm_edid.h>
27 #include <drm/drm_of.h>
28 #include <drm/drm_panel.h>
29 #include <drm/drm_print.h>
30 #include <drm/drm_probe_helper.h>
32 #include "analogix-i2c-dptx.h"
33 #include "analogix-i2c-txcommon.h"
35 #define POLL_DELAY 50000 /* us */
36 #define POLL_TIMEOUT 5000000 /* us */
38 #define I2C_IDX_DPTX 0
39 #define I2C_IDX_TXCOM 1
41 static const u8 anx6345_i2c_addresses[] = {
42 [I2C_IDX_DPTX] = 0x70,
43 [I2C_IDX_TXCOM] = 0x72,
45 #define I2C_NUM_ADDRESSES ARRAY_SIZE(anx6345_i2c_addresses)
48 struct drm_dp_aux aux;
49 struct drm_bridge bridge;
50 struct i2c_client *client;
52 struct drm_connector connector;
53 struct drm_panel *panel;
54 struct regulator *dvdd12;
55 struct regulator *dvdd25;
56 struct gpio_desc *gpiod_reset;
57 struct mutex lock; /* protect EDID access */
59 /* I2C Slave addresses of ANX6345 are mapped as DPTX and SYS */
60 struct i2c_client *i2c_clients[I2C_NUM_ADDRESSES];
61 struct regmap *map[I2C_NUM_ADDRESSES];
64 u8 dpcd[DP_RECEIVER_CAP_SIZE];
69 static inline struct anx6345 *connector_to_anx6345(struct drm_connector *c)
71 return container_of(c, struct anx6345, connector);
74 static inline struct anx6345 *bridge_to_anx6345(struct drm_bridge *bridge)
76 return container_of(bridge, struct anx6345, bridge);
79 static int anx6345_set_bits(struct regmap *map, u8 reg, u8 mask)
81 return regmap_update_bits(map, reg, mask, mask);
84 static int anx6345_clear_bits(struct regmap *map, u8 reg, u8 mask)
86 return regmap_update_bits(map, reg, mask, 0);
89 static ssize_t anx6345_aux_transfer(struct drm_dp_aux *aux,
90 struct drm_dp_aux_msg *msg)
92 struct anx6345 *anx6345 = container_of(aux, struct anx6345, aux);
94 return anx_dp_aux_transfer(anx6345->map[I2C_IDX_DPTX], msg);
97 static int anx6345_dp_link_training(struct anx6345 *anx6345)
103 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
104 SP_POWERDOWN_CTRL_REG,
109 err = drm_dp_dpcd_readb(&anx6345->aux, DP_MAX_LINK_RATE, &dp_bw);
114 case DP_LINK_BW_1_62:
119 DRM_DEBUG_KMS("DP bandwidth (%#02x) not supported\n", dp_bw);
123 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
128 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
129 SP_VID_CTRL1_REG, SP_VIDEO_EN);
134 err = drm_dp_dpcd_read(&anx6345->aux, DP_DPCD_REV,
135 &anx6345->dpcd, DP_RECEIVER_CAP_SIZE);
137 DRM_ERROR("Failed to read DPCD: %d\n", err);
141 /* Clear channel x SERDES power down */
142 err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX],
143 SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD);
148 * Power up the sink (DP_SET_POWER register is only available on DPCD
151 if (anx6345->dpcd[DP_DPCD_REV] >= 0x11) {
152 err = drm_dp_dpcd_readb(&anx6345->aux, DP_SET_POWER, &dpcd[0]);
154 DRM_ERROR("Failed to read DP_SET_POWER register: %d\n",
159 dpcd[0] &= ~DP_SET_POWER_MASK;
160 dpcd[0] |= DP_SET_POWER_D0;
162 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_SET_POWER, dpcd[0]);
164 DRM_ERROR("Failed to power up DisplayPort link: %d\n",
170 * According to the DP 1.1 specification, a "Sink Device must
171 * exit the power saving state within 1 ms" (Section 2.5.3.1,
172 * Table 5-52, "Sink Control Field" (register 0x600).
174 usleep_range(1000, 2000);
177 /* Possibly enable downspread on the sink */
178 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
179 SP_DP_DOWNSPREAD_CTRL1_REG, 0);
183 if (anx6345->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) {
184 DRM_DEBUG("Enable downspread on the sink\n");
186 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
187 SP_DP_DOWNSPREAD_CTRL1_REG, 8);
191 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL,
196 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 0);
201 /* Set the lane count and the link rate on the sink */
202 if (drm_dp_enhanced_frame_cap(anx6345->dpcd))
203 err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
204 SP_DP_SYSTEM_CTRL_BASE + 4,
207 err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX],
208 SP_DP_SYSTEM_CTRL_BASE + 4,
214 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
215 SP_DP_MAIN_LINK_BW_SET_REG, dpcd[0]);
219 dpcd[1] = drm_dp_max_lane_count(anx6345->dpcd);
221 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
222 SP_DP_LANE_COUNT_SET_REG, dpcd[1]);
226 if (drm_dp_enhanced_frame_cap(anx6345->dpcd))
227 dpcd[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
229 err = drm_dp_dpcd_write(&anx6345->aux, DP_LINK_BW_SET, dpcd,
233 DRM_ERROR("Failed to configure link: %d\n", err);
237 /* Start training on the source */
238 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_LT_CTRL_REG,
243 return regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX],
245 value, !(value & SP_DP_LT_INPROGRESS),
246 POLL_DELAY, POLL_TIMEOUT);
249 static int anx6345_tx_initialization(struct anx6345 *anx6345)
253 /* FIXME: colordepth is hardcoded for now */
254 err = regmap_write(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL2_REG,
255 SP_IN_BPC_6BIT << SP_IN_BPC_SHIFT);
259 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_PLL_CTRL_REG, 0);
263 err = regmap_write(anx6345->map[I2C_IDX_TXCOM],
264 SP_ANALOG_DEBUG1_REG, 0);
268 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
269 SP_DP_LINK_DEBUG_CTRL_REG,
270 SP_NEW_PRBS7 | SP_M_VID_DEBUG);
274 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
275 SP_DP_ANALOG_POWER_DOWN_REG, 0);
280 err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
281 SP_DP_SYSTEM_CTRL_BASE + 3,
282 SP_HPD_FORCE | SP_HPD_CTRL);
286 for (i = 0; i < 4; i++) {
288 err = regmap_write(anx6345->map[I2C_IDX_DPTX],
289 SP_DP_LANE0_LT_CTRL_REG + i, 0);
295 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM],
296 SP_RESET_CTRL2_REG, SP_AUX_RST);
300 return anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
301 SP_RESET_CTRL2_REG, SP_AUX_RST);
304 static void anx6345_poweron(struct anx6345 *anx6345)
308 /* Ensure reset is asserted before starting power on sequence */
309 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
310 usleep_range(1000, 2000);
312 err = regulator_enable(anx6345->dvdd12);
314 DRM_ERROR("Failed to enable dvdd12 regulator: %d\n",
319 /* T1 - delay between VDD12 and VDD25 should be 0-2ms */
320 usleep_range(1000, 2000);
322 err = regulator_enable(anx6345->dvdd25);
324 DRM_ERROR("Failed to enable dvdd25 regulator: %d\n",
329 /* T2 - delay between RESETN and all power rail stable,
332 usleep_range(2000, 5000);
334 gpiod_set_value_cansleep(anx6345->gpiod_reset, 0);
336 /* Power on registers module */
337 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
338 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
339 anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
340 SP_REGISTER_PD | SP_TOTAL_PD);
343 drm_panel_prepare(anx6345->panel);
345 anx6345->powered = true;
348 static void anx6345_poweroff(struct anx6345 *anx6345)
352 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
353 usleep_range(1000, 2000);
356 drm_panel_unprepare(anx6345->panel);
358 err = regulator_disable(anx6345->dvdd25);
360 DRM_ERROR("Failed to disable dvdd25 regulator: %d\n",
365 usleep_range(5000, 10000);
367 err = regulator_disable(anx6345->dvdd12);
369 DRM_ERROR("Failed to disable dvdd12 regulator: %d\n",
374 usleep_range(1000, 2000);
376 anx6345->powered = false;
379 static int anx6345_start(struct anx6345 *anx6345)
383 if (!anx6345->powered)
384 anx6345_poweron(anx6345);
386 /* Power on needed modules */
387 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
388 SP_POWERDOWN_CTRL_REG,
389 SP_VIDEO_PD | SP_LINK_PD);
391 err = anx6345_tx_initialization(anx6345);
393 DRM_ERROR("Failed eDP transmitter initialization: %d\n", err);
394 anx6345_poweroff(anx6345);
398 err = anx6345_dp_link_training(anx6345);
400 DRM_ERROR("Failed link training: %d\n", err);
401 anx6345_poweroff(anx6345);
406 * This delay seems to help keep the hardware in a good state. Without
407 * it, there are times where it fails silently.
409 usleep_range(10000, 15000);
414 static int anx6345_config_dp_output(struct anx6345 *anx6345)
418 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
423 /* Enable DP output */
424 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
429 /* Force stream valid */
430 return anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
431 SP_DP_SYSTEM_CTRL_BASE + 3,
432 SP_STRM_FORCE | SP_STRM_CTRL);
435 static int anx6345_get_downstream_info(struct anx6345 *anx6345)
440 err = drm_dp_dpcd_readb(&anx6345->aux, DP_SINK_COUNT, &value);
442 DRM_ERROR("Get sink count failed %d\n", err);
446 if (!DP_GET_SINK_COUNT(value)) {
447 DRM_ERROR("Downstream disconnected\n");
454 static int anx6345_get_modes(struct drm_connector *connector)
456 struct anx6345 *anx6345 = connector_to_anx6345(connector);
457 int err, num_modes = 0;
458 bool power_off = false;
460 mutex_lock(&anx6345->lock);
462 if (!anx6345->edid) {
463 if (!anx6345->powered) {
464 anx6345_poweron(anx6345);
468 err = anx6345_get_downstream_info(anx6345);
470 DRM_ERROR("Failed to get downstream info: %d\n", err);
474 anx6345->edid = drm_get_edid(connector, &anx6345->aux.ddc);
476 DRM_ERROR("Failed to read EDID from panel\n");
478 err = drm_connector_update_edid_property(connector,
481 DRM_ERROR("Failed to update EDID property: %d\n", err);
486 num_modes += drm_add_edid_modes(connector, anx6345->edid);
490 anx6345_poweroff(anx6345);
492 mutex_unlock(&anx6345->lock);
494 if (!num_modes && anx6345->panel)
495 num_modes += drm_panel_get_modes(anx6345->panel, connector);
500 static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = {
501 .get_modes = anx6345_get_modes,
505 anx6345_connector_destroy(struct drm_connector *connector)
507 struct anx6345 *anx6345 = connector_to_anx6345(connector);
510 drm_panel_detach(anx6345->panel);
511 drm_connector_cleanup(connector);
514 static const struct drm_connector_funcs anx6345_connector_funcs = {
515 .fill_modes = drm_helper_probe_single_connector_modes,
516 .destroy = anx6345_connector_destroy,
517 .reset = drm_atomic_helper_connector_reset,
518 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
519 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
522 static int anx6345_bridge_attach(struct drm_bridge *bridge,
523 enum drm_bridge_attach_flags flags)
525 struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
528 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
529 DRM_ERROR("Fix bridge driver to make connector optional!");
533 if (!bridge->encoder) {
534 DRM_ERROR("Parent encoder object not found");
538 /* Register aux channel */
539 anx6345->aux.name = "DP-AUX";
540 anx6345->aux.dev = &anx6345->client->dev;
541 anx6345->aux.transfer = anx6345_aux_transfer;
543 err = drm_dp_aux_register(&anx6345->aux);
545 DRM_ERROR("Failed to register aux channel: %d\n", err);
549 err = drm_connector_init(bridge->dev, &anx6345->connector,
550 &anx6345_connector_funcs,
551 DRM_MODE_CONNECTOR_eDP);
553 DRM_ERROR("Failed to initialize connector: %d\n", err);
557 drm_connector_helper_add(&anx6345->connector,
558 &anx6345_connector_helper_funcs);
560 err = drm_connector_register(&anx6345->connector);
562 DRM_ERROR("Failed to register connector: %d\n", err);
566 anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD;
568 err = drm_connector_attach_encoder(&anx6345->connector,
571 DRM_ERROR("Failed to link up connector to encoder: %d\n", err);
575 if (anx6345->panel) {
576 err = drm_panel_attach(anx6345->panel, &anx6345->connector);
578 DRM_ERROR("Failed to attach panel: %d\n", err);
586 static enum drm_mode_status
587 anx6345_bridge_mode_valid(struct drm_bridge *bridge,
588 const struct drm_display_mode *mode)
590 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
591 return MODE_NO_INTERLACE;
593 /* Max 1200p at 5.4 Ghz, one lane */
594 if (mode->clock > 154000)
595 return MODE_CLOCK_HIGH;
600 static void anx6345_bridge_disable(struct drm_bridge *bridge)
602 struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
604 /* Power off all modules except configuration registers access */
605 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
606 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
608 drm_panel_disable(anx6345->panel);
610 if (anx6345->powered)
611 anx6345_poweroff(anx6345);
614 static void anx6345_bridge_enable(struct drm_bridge *bridge)
616 struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
620 drm_panel_enable(anx6345->panel);
622 err = anx6345_start(anx6345);
624 DRM_ERROR("Failed to initialize: %d\n", err);
628 err = anx6345_config_dp_output(anx6345);
630 DRM_ERROR("Failed to enable DP output: %d\n", err);
633 static const struct drm_bridge_funcs anx6345_bridge_funcs = {
634 .attach = anx6345_bridge_attach,
635 .mode_valid = anx6345_bridge_mode_valid,
636 .disable = anx6345_bridge_disable,
637 .enable = anx6345_bridge_enable,
640 static void unregister_i2c_dummy_clients(struct anx6345 *anx6345)
644 for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++)
645 if (anx6345->i2c_clients[i] &&
646 anx6345->i2c_clients[i]->addr != anx6345->client->addr)
647 i2c_unregister_device(anx6345->i2c_clients[i]);
650 static const struct regmap_config anx6345_regmap_config = {
653 .max_register = 0xff,
654 .cache_type = REGCACHE_NONE,
657 static const u16 anx6345_chipid_list[] = {
661 static bool anx6345_get_chip_id(struct anx6345 *anx6345)
663 unsigned int i, idl, idh, version;
665 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl))
668 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh))
671 anx6345->chipid = (u8)idl | ((u8)idh << 8);
673 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG,
677 for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) {
678 if (anx6345->chipid == anx6345_chipid_list[i]) {
679 DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n",
680 anx6345->chipid, version);
685 DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n",
686 anx6345->chipid, version);
691 static int anx6345_i2c_probe(struct i2c_client *client,
692 const struct i2c_device_id *id)
694 struct anx6345 *anx6345;
698 anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL);
702 mutex_init(&anx6345->lock);
704 anx6345->bridge.of_node = client->dev.of_node;
706 anx6345->client = client;
707 i2c_set_clientdata(client, anx6345);
709 dev = &anx6345->client->dev;
711 err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0,
712 &anx6345->panel, NULL);
713 if (err == -EPROBE_DEFER)
717 DRM_DEBUG("No panel found\n");
719 /* 1.2V digital core power regulator */
720 anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12");
721 if (IS_ERR(anx6345->dvdd12)) {
722 if (PTR_ERR(anx6345->dvdd12) != -EPROBE_DEFER)
723 DRM_ERROR("Failed to get dvdd12 supply (%ld)\n",
724 PTR_ERR(anx6345->dvdd12));
725 return PTR_ERR(anx6345->dvdd12);
728 /* 2.5V digital core power regulator */
729 anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25");
730 if (IS_ERR(anx6345->dvdd25)) {
731 if (PTR_ERR(anx6345->dvdd25) != -EPROBE_DEFER)
732 DRM_ERROR("Failed to get dvdd25 supply (%ld)\n",
733 PTR_ERR(anx6345->dvdd25));
734 return PTR_ERR(anx6345->dvdd25);
737 /* GPIO for chip reset */
738 anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
739 if (IS_ERR(anx6345->gpiod_reset)) {
740 DRM_ERROR("Reset gpio not found\n");
741 return PTR_ERR(anx6345->gpiod_reset);
744 /* Map slave addresses of ANX6345 */
745 for (i = 0; i < I2C_NUM_ADDRESSES; i++) {
746 if (anx6345_i2c_addresses[i] >> 1 != client->addr)
747 anx6345->i2c_clients[i] = i2c_new_dummy_device(client->adapter,
748 anx6345_i2c_addresses[i] >> 1);
750 anx6345->i2c_clients[i] = client;
752 if (IS_ERR(anx6345->i2c_clients[i])) {
753 err = PTR_ERR(anx6345->i2c_clients[i]);
754 DRM_ERROR("Failed to reserve I2C bus %02x\n",
755 anx6345_i2c_addresses[i]);
756 goto err_unregister_i2c;
759 anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i],
760 &anx6345_regmap_config);
761 if (IS_ERR(anx6345->map[i])) {
762 err = PTR_ERR(anx6345->map[i]);
763 DRM_ERROR("Failed regmap initialization %02x\n",
764 anx6345_i2c_addresses[i]);
765 goto err_unregister_i2c;
769 /* Look for supported chip ID */
770 anx6345_poweron(anx6345);
771 if (anx6345_get_chip_id(anx6345)) {
772 anx6345->bridge.funcs = &anx6345_bridge_funcs;
773 drm_bridge_add(&anx6345->bridge);
777 anx6345_poweroff(anx6345);
782 unregister_i2c_dummy_clients(anx6345);
786 static int anx6345_i2c_remove(struct i2c_client *client)
788 struct anx6345 *anx6345 = i2c_get_clientdata(client);
790 drm_bridge_remove(&anx6345->bridge);
792 unregister_i2c_dummy_clients(anx6345);
794 kfree(anx6345->edid);
796 mutex_destroy(&anx6345->lock);
801 static const struct i2c_device_id anx6345_id[] = {
805 MODULE_DEVICE_TABLE(i2c, anx6345_id);
807 static const struct of_device_id anx6345_match_table[] = {
808 { .compatible = "analogix,anx6345", },
811 MODULE_DEVICE_TABLE(of, anx6345_match_table);
813 static struct i2c_driver anx6345_driver = {
816 .of_match_table = of_match_ptr(anx6345_match_table),
818 .probe = anx6345_i2c_probe,
819 .remove = anx6345_i2c_remove,
820 .id_table = anx6345_id,
822 module_i2c_driver(anx6345_driver);
824 MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver");
825 MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
826 MODULE_LICENSE("GPL v2");