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ubuntu-linux-kernel/drivers/gpu/drm/bridge/analogix-anx78xx.c

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2024-04-01 15:06:58 +00:00
/*
* Copyright(c) 2016, Analogix Semiconductor.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Based on anx7808 driver obtained from chromeos with copyright:
* Copyright(c) 2013, Google Inc.
*
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <linux/types.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_edid.h>
#include "analogix-anx78xx.h"
#define I2C_NUM_ADDRESSES 5
#define I2C_IDX_TX_P0 0
#define I2C_IDX_TX_P1 1
#define I2C_IDX_TX_P2 2
#define I2C_IDX_RX_P0 3
#define I2C_IDX_RX_P1 4
#define XTAL_CLK 270 /* 27M */
#define AUX_CH_BUFFER_SIZE 16
#define AUX_WAIT_TIMEOUT_MS 15
static const u8 anx78xx_i2c_addresses[] = {
[I2C_IDX_TX_P0] = TX_P0,
[I2C_IDX_TX_P1] = TX_P1,
[I2C_IDX_TX_P2] = TX_P2,
[I2C_IDX_RX_P0] = RX_P0,
[I2C_IDX_RX_P1] = RX_P1,
};
struct anx78xx_platform_data {
struct regulator *dvdd10;
struct gpio_desc *gpiod_hpd;
struct gpio_desc *gpiod_pd;
struct gpio_desc *gpiod_reset;
int hpd_irq;
int intp_irq;
};
struct anx78xx {
struct drm_dp_aux aux;
struct drm_bridge bridge;
struct i2c_client *client;
struct edid *edid;
struct drm_connector connector;
struct drm_dp_link link;
struct anx78xx_platform_data pdata;
struct mutex lock;
/*
* I2C Slave addresses of ANX7814 are mapped as TX_P0, TX_P1, TX_P2,
* RX_P0 and RX_P1.
*/
struct i2c_client *i2c_dummy[I2C_NUM_ADDRESSES];
struct regmap *map[I2C_NUM_ADDRESSES];
u16 chipid;
u8 dpcd[DP_RECEIVER_CAP_SIZE];
bool powered;
};
static inline struct anx78xx *connector_to_anx78xx(struct drm_connector *c)
{
return container_of(c, struct anx78xx, connector);
}
static inline struct anx78xx *bridge_to_anx78xx(struct drm_bridge *bridge)
{
return container_of(bridge, struct anx78xx, bridge);
}
static int anx78xx_set_bits(struct regmap *map, u8 reg, u8 mask)
{
return regmap_update_bits(map, reg, mask, mask);
}
static int anx78xx_clear_bits(struct regmap *map, u8 reg, u8 mask)
{
return regmap_update_bits(map, reg, mask, 0);
}
static bool anx78xx_aux_op_finished(struct anx78xx *anx78xx)
{
unsigned int value;
int err;
err = regmap_read(anx78xx->map[I2C_IDX_TX_P0], SP_DP_AUX_CH_CTRL2_REG,
&value);
if (err < 0)
return false;
return (value & SP_AUX_EN) == 0;
}
static int anx78xx_aux_wait(struct anx78xx *anx78xx)
{
unsigned long timeout;
unsigned int status;
int err;
timeout = jiffies + msecs_to_jiffies(AUX_WAIT_TIMEOUT_MS) + 1;
while (!anx78xx_aux_op_finished(anx78xx)) {
if (time_after(jiffies, timeout)) {
if (!anx78xx_aux_op_finished(anx78xx)) {
DRM_ERROR("Timed out waiting AUX to finish\n");
return -ETIMEDOUT;
}
break;
}
usleep_range(1000, 2000);
}
/* Read the AUX channel access status */
err = regmap_read(anx78xx->map[I2C_IDX_TX_P0], SP_AUX_CH_STATUS_REG,
&status);
if (err < 0) {
DRM_ERROR("Failed to read from AUX channel: %d\n", err);
return err;
}
if (status & SP_AUX_STATUS) {
DRM_ERROR("Failed to wait for AUX channel (status: %02x)\n",
status);
return -ETIMEDOUT;
}
return 0;
}
static int anx78xx_aux_address(struct anx78xx *anx78xx, unsigned int addr)
{
int err;
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_AUX_ADDR_7_0_REG,
addr & 0xff);
if (err)
return err;
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_AUX_ADDR_15_8_REG,
(addr & 0xff00) >> 8);
if (err)
return err;
/*
* DP AUX CH Address Register #2, only update bits[3:0]
* [7:4] RESERVED
* [3:0] AUX_ADDR[19:16], Register control AUX CH address.
*/
err = regmap_update_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_AUX_ADDR_19_16_REG,
SP_AUX_ADDR_19_16_MASK,
(addr & 0xf0000) >> 16);
if (err)
return err;
return 0;
}
static ssize_t anx78xx_aux_transfer(struct drm_dp_aux *aux,
struct drm_dp_aux_msg *msg)
{
struct anx78xx *anx78xx = container_of(aux, struct anx78xx, aux);
u8 ctrl1 = msg->request;
u8 ctrl2 = SP_AUX_EN;
u8 *buffer = msg->buffer;
int err;
/* The DP AUX transmit and receive buffer has 16 bytes. */
if (WARN_ON(msg->size > AUX_CH_BUFFER_SIZE))
return -E2BIG;
/* Zero-sized messages specify address-only transactions. */
if (msg->size < 1)
ctrl2 |= SP_ADDR_ONLY;
else /* For non-zero-sized set the length field. */
ctrl1 |= (msg->size - 1) << SP_AUX_LENGTH_SHIFT;
if ((msg->request & DP_AUX_I2C_READ) == 0) {
/* When WRITE | MOT write values to data buffer */
err = regmap_bulk_write(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_BUF_DATA0_REG, buffer,
msg->size);
if (err)
return err;
}
/* Write address and request */
err = anx78xx_aux_address(anx78xx, msg->address);
if (err)
return err;
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_DP_AUX_CH_CTRL1_REG,
ctrl1);
if (err)
return err;
/* Start transaction */
err = regmap_update_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_AUX_CH_CTRL2_REG, SP_ADDR_ONLY |
SP_AUX_EN, ctrl2);
if (err)
return err;
err = anx78xx_aux_wait(anx78xx);
if (err)
return err;
msg->reply = DP_AUX_I2C_REPLY_ACK;
if ((msg->size > 0) && (msg->request & DP_AUX_I2C_READ)) {
/* Read values from data buffer */
err = regmap_bulk_read(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_BUF_DATA0_REG, buffer,
msg->size);
if (err)
return err;
}
err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_AUX_CH_CTRL2_REG, SP_ADDR_ONLY);
if (err)
return err;
return msg->size;
}
static int anx78xx_set_hpd(struct anx78xx *anx78xx)
{
int err;
err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_RX_P0],
SP_TMDS_CTRL_BASE + 7, SP_PD_RT);
if (err)
return err;
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P2], SP_VID_CTRL3_REG,
SP_HPD_OUT);
if (err)
return err;
return 0;
}
static int anx78xx_clear_hpd(struct anx78xx *anx78xx)
{
int err;
err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P2], SP_VID_CTRL3_REG,
SP_HPD_OUT);
if (err)
return err;
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_RX_P0],
SP_TMDS_CTRL_BASE + 7, SP_PD_RT);
if (err)
return err;
return 0;
}
static const struct reg_sequence tmds_phy_initialization[] = {
{ SP_TMDS_CTRL_BASE + 1, 0x90 },
{ SP_TMDS_CTRL_BASE + 2, 0xa9 },
{ SP_TMDS_CTRL_BASE + 6, 0x92 },
{ SP_TMDS_CTRL_BASE + 7, 0x80 },
{ SP_TMDS_CTRL_BASE + 20, 0xf2 },
{ SP_TMDS_CTRL_BASE + 22, 0xc4 },
{ SP_TMDS_CTRL_BASE + 23, 0x18 },
};
static int anx78xx_rx_initialization(struct anx78xx *anx78xx)
{
int err;
err = regmap_write(anx78xx->map[I2C_IDX_RX_P0], SP_HDMI_MUTE_CTRL_REG,
SP_AUD_MUTE | SP_VID_MUTE);
if (err)
return err;
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_RX_P0], SP_CHIP_CTRL_REG,
SP_MAN_HDMI5V_DET | SP_PLLLOCK_CKDT_EN |
SP_DIGITAL_CKDT_EN);
if (err)
return err;
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_RX_P0],
SP_SOFTWARE_RESET1_REG, SP_HDCP_MAN_RST |
SP_SW_MAN_RST | SP_TMDS_RST | SP_VIDEO_RST);
if (err)
return err;
err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_RX_P0],
SP_SOFTWARE_RESET1_REG, SP_HDCP_MAN_RST |
SP_SW_MAN_RST | SP_TMDS_RST | SP_VIDEO_RST);
if (err)
return err;
/* Sync detect change, GP set mute */
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_RX_P0],
SP_AUD_EXCEPTION_ENABLE_BASE + 1, BIT(5) |
BIT(6));
if (err)
return err;
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_RX_P0],
SP_AUD_EXCEPTION_ENABLE_BASE + 3,
SP_AEC_EN21);
if (err)
return err;
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_RX_P0], SP_AUDVID_CTRL_REG,
SP_AVC_EN | SP_AAC_OE | SP_AAC_EN);
if (err)
return err;
err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_RX_P0],
SP_SYSTEM_POWER_DOWN1_REG, SP_PWDN_CTRL);
if (err)
return err;
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_RX_P0],
SP_VID_DATA_RANGE_CTRL_REG, SP_R2Y_INPUT_LIMIT);
if (err)
return err;
/* Enable DDC stretch */
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_EXTRA_I2C_DEV_ADDR_REG, SP_I2C_EXTRA_ADDR);
if (err)
return err;
/* TMDS phy initialization */
err = regmap_multi_reg_write(anx78xx->map[I2C_IDX_RX_P0],
tmds_phy_initialization,
ARRAY_SIZE(tmds_phy_initialization));
if (err)
return err;
err = anx78xx_clear_hpd(anx78xx);
if (err)
return err;
return 0;
}
static const u8 dp_tx_output_precise_tune_bits[20] = {
0x01, 0x03, 0x07, 0x7f, 0x71, 0x6b, 0x7f,
0x73, 0x7f, 0x7f, 0x00, 0x00, 0x00, 0x00,
0x0c, 0x42, 0x1e, 0x3e, 0x72, 0x7e,
};
static int anx78xx_link_phy_initialization(struct anx78xx *anx78xx)
{
int err;
/*
* REVISIT : It is writing to a RESERVED bits in Analog Control 0
* register.
*/
err = regmap_write(anx78xx->map[I2C_IDX_TX_P2], SP_ANALOG_CTRL0_REG,
0x02);
if (err)
return err;
/*
* Write DP TX output emphasis precise tune bits.
*/
err = regmap_bulk_write(anx78xx->map[I2C_IDX_TX_P1],
SP_DP_TX_LT_CTRL0_REG,
dp_tx_output_precise_tune_bits,
ARRAY_SIZE(dp_tx_output_precise_tune_bits));
if (err)
return err;
return 0;
}
static int anx78xx_xtal_clk_sel(struct anx78xx *anx78xx)
{
unsigned int value;
int err;
err = regmap_update_bits(anx78xx->map[I2C_IDX_TX_P2],
SP_ANALOG_DEBUG2_REG,
SP_XTAL_FRQ | SP_FORCE_SW_OFF_BYPASS,
SP_XTAL_FRQ_27M);
if (err)
return err;
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_DP_AUX_CH_CTRL3_REG,
XTAL_CLK & SP_WAIT_COUNTER_7_0_MASK);
if (err)
return err;
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_DP_AUX_CH_CTRL4_REG,
((XTAL_CLK & 0xff00) >> 2) | (XTAL_CLK / 10));
if (err)
return err;
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
SP_I2C_GEN_10US_TIMER0_REG, XTAL_CLK & 0xff);
if (err)
return err;
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
SP_I2C_GEN_10US_TIMER1_REG,
(XTAL_CLK & 0xff00) >> 8);
if (err)
return err;
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_AUX_MISC_CTRL_REG,
XTAL_CLK / 10 - 1);
if (err)
return err;
err = regmap_read(anx78xx->map[I2C_IDX_RX_P0],
SP_HDMI_US_TIMER_CTRL_REG,
&value);
if (err)
return err;
err = regmap_write(anx78xx->map[I2C_IDX_RX_P0],
SP_HDMI_US_TIMER_CTRL_REG,
(value & SP_MS_TIMER_MARGIN_10_8_MASK) |
((((XTAL_CLK / 10) >> 1) - 2) << 3));
if (err)
return err;
return 0;
}
static const struct reg_sequence otp_key_protect[] = {
{ SP_OTP_KEY_PROTECT1_REG, SP_OTP_PSW1 },
{ SP_OTP_KEY_PROTECT2_REG, SP_OTP_PSW2 },
{ SP_OTP_KEY_PROTECT3_REG, SP_OTP_PSW3 },
};
static int anx78xx_tx_initialization(struct anx78xx *anx78xx)
{
int err;
/* Set terminal resistor to 50 ohm */
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_DP_AUX_CH_CTRL2_REG,
0x30);
if (err)
return err;
/* Enable aux double diff output */
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_AUX_CH_CTRL2_REG, 0x08);
if (err)
return err;
err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_HDCP_CTRL_REG, SP_AUTO_EN |
SP_AUTO_START);
if (err)
return err;
err = regmap_multi_reg_write(anx78xx->map[I2C_IDX_TX_P0],
otp_key_protect,
ARRAY_SIZE(otp_key_protect));
if (err)
return err;
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_HDCP_KEY_COMMAND_REG, SP_DISABLE_SYNC_HDCP);
if (err)
return err;
err = regmap_write(anx78xx->map[I2C_IDX_TX_P2], SP_VID_CTRL8_REG,
SP_VID_VRES_TH);
if (err)
return err;
/*
* DP HDCP auto authentication wait timer (when downstream starts to
* auth, DP side will wait for this period then do auth automatically)
*/
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_HDCP_AUTO_TIMER_REG,
0x00);
if (err)
return err;
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_HDCP_CTRL_REG, SP_LINK_POLLING);
if (err)
return err;
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_LINK_DEBUG_CTRL_REG, SP_M_VID_DEBUG);
if (err)
return err;
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P2],
SP_ANALOG_DEBUG2_REG, SP_POWERON_TIME_1P5MS);
if (err)
return err;
err = anx78xx_xtal_clk_sel(anx78xx);
if (err)
return err;
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_AUX_DEFER_CTRL_REG,
SP_DEFER_CTRL_EN | 0x0c);
if (err)
return err;
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_POLLING_CTRL_REG,
SP_AUTO_POLLING_DISABLE);
if (err)
return err;
/*
* Short the link integrity check timer to speed up bstatus
* polling for HDCP CTS item 1A-07
*/
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
SP_HDCP_LINK_CHECK_TIMER_REG, 0x1d);
if (err)
return err;
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_MISC_CTRL_REG, SP_EQ_TRAINING_LOOP);
if (err)
return err;
/* Power down the main link by default */
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD);
if (err)
return err;
err = anx78xx_link_phy_initialization(anx78xx);
if (err)
return err;
/* Gen m_clk with downspreading */
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_M_CALCULATION_CTRL_REG, SP_M_GEN_CLK_SEL);
if (err)
return err;
return 0;
}
static int anx78xx_enable_interrupts(struct anx78xx *anx78xx)
{
int err;
/*
* BIT0: INT pin assertion polarity: 1 = assert high
* BIT1: INT pin output type: 0 = push/pull
*/
err = regmap_write(anx78xx->map[I2C_IDX_TX_P2], SP_INT_CTRL_REG, 0x01);
if (err)
return err;
err = regmap_write(anx78xx->map[I2C_IDX_TX_P2],
SP_COMMON_INT_MASK4_REG, SP_HPD_LOST | SP_HPD_PLUG);
if (err)
return err;
err = regmap_write(anx78xx->map[I2C_IDX_TX_P2], SP_DP_INT_MASK1_REG,
SP_TRAINING_FINISH);
if (err)
return err;
err = regmap_write(anx78xx->map[I2C_IDX_RX_P0], SP_INT_MASK1_REG,
SP_CKDT_CHG | SP_SCDT_CHG);
if (err)
return err;
return 0;
}
static void anx78xx_poweron(struct anx78xx *anx78xx)
{
struct anx78xx_platform_data *pdata = &anx78xx->pdata;
int err;
if (WARN_ON(anx78xx->powered))
return;
if (pdata->dvdd10) {
err = regulator_enable(pdata->dvdd10);
if (err) {
DRM_ERROR("Failed to enable DVDD10 regulator: %d\n",
err);
return;
}
usleep_range(1000, 2000);
}
gpiod_set_value_cansleep(pdata->gpiod_reset, 1);
usleep_range(1000, 2000);
gpiod_set_value_cansleep(pdata->gpiod_pd, 0);
usleep_range(1000, 2000);
gpiod_set_value_cansleep(pdata->gpiod_reset, 0);
/* Power on registers module */
anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P2], SP_POWERDOWN_CTRL_REG,
SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P2], SP_POWERDOWN_CTRL_REG,
SP_REGISTER_PD | SP_TOTAL_PD);
anx78xx->powered = true;
}
static void anx78xx_poweroff(struct anx78xx *anx78xx)
{
struct anx78xx_platform_data *pdata = &anx78xx->pdata;
int err;
if (WARN_ON(!anx78xx->powered))
return;
gpiod_set_value_cansleep(pdata->gpiod_reset, 1);
usleep_range(1000, 2000);
gpiod_set_value_cansleep(pdata->gpiod_pd, 1);
usleep_range(1000, 2000);
if (pdata->dvdd10) {
err = regulator_disable(pdata->dvdd10);
if (err) {
DRM_ERROR("Failed to disable DVDD10 regulator: %d\n",
err);
return;
}
usleep_range(1000, 2000);
}
anx78xx->powered = false;
}
static int anx78xx_start(struct anx78xx *anx78xx)
{
int err;
/* Power on all modules */
err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P2],
SP_POWERDOWN_CTRL_REG,
SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD |
SP_LINK_PD);
err = anx78xx_enable_interrupts(anx78xx);
if (err) {
DRM_ERROR("Failed to enable interrupts: %d\n", err);
goto err_poweroff;
}
err = anx78xx_rx_initialization(anx78xx);
if (err) {
DRM_ERROR("Failed receiver initialization: %d\n", err);
goto err_poweroff;
}
err = anx78xx_tx_initialization(anx78xx);
if (err) {
DRM_ERROR("Failed transmitter initialization: %d\n", err);
goto err_poweroff;
}
/*
* This delay seems to help keep the hardware in a good state. Without
* it, there are times where it fails silently.
*/
usleep_range(10000, 15000);
return 0;
err_poweroff:
DRM_ERROR("Failed SlimPort transmitter initialization: %d\n", err);
anx78xx_poweroff(anx78xx);
return err;
}
static int anx78xx_init_pdata(struct anx78xx *anx78xx)
{
struct anx78xx_platform_data *pdata = &anx78xx->pdata;
struct device *dev = &anx78xx->client->dev;
/* 1.0V digital core power regulator */
pdata->dvdd10 = devm_regulator_get(dev, "dvdd10");
if (IS_ERR(pdata->dvdd10)) {
DRM_ERROR("DVDD10 regulator not found\n");
return PTR_ERR(pdata->dvdd10);
}
/* GPIO for HPD */
pdata->gpiod_hpd = devm_gpiod_get(dev, "hpd", GPIOD_IN);
if (IS_ERR(pdata->gpiod_hpd))
return PTR_ERR(pdata->gpiod_hpd);
/* GPIO for chip power down */
pdata->gpiod_pd = devm_gpiod_get(dev, "pd", GPIOD_OUT_HIGH);
if (IS_ERR(pdata->gpiod_pd))
return PTR_ERR(pdata->gpiod_pd);
/* GPIO for chip reset */
pdata->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
return PTR_ERR_OR_ZERO(pdata->gpiod_reset);
}
static int anx78xx_dp_link_training(struct anx78xx *anx78xx)
{
u8 dp_bw, value;
int err;
err = regmap_write(anx78xx->map[I2C_IDX_RX_P0], SP_HDMI_MUTE_CTRL_REG,
0x0);
if (err)
return err;
err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P2],
SP_POWERDOWN_CTRL_REG,
SP_TOTAL_PD);
if (err)
return err;
err = drm_dp_dpcd_readb(&anx78xx->aux, DP_MAX_LINK_RATE, &dp_bw);
if (err < 0)
return err;
switch (dp_bw) {
case DP_LINK_BW_1_62:
case DP_LINK_BW_2_7:
case DP_LINK_BW_5_4:
break;
default:
DRM_DEBUG_KMS("DP bandwidth (%#02x) not supported\n", dp_bw);
return -EINVAL;
}
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P2], SP_VID_CTRL1_REG,
SP_VIDEO_MUTE);
if (err)
return err;
err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P2],
SP_VID_CTRL1_REG, SP_VIDEO_EN);
if (err)
return err;
/* Get DPCD info */
err = drm_dp_dpcd_read(&anx78xx->aux, DP_DPCD_REV,
&anx78xx->dpcd, DP_RECEIVER_CAP_SIZE);
if (err < 0) {
DRM_ERROR("Failed to read DPCD: %d\n", err);
return err;
}
/* Clear channel x SERDES power down */
err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD);
if (err)
return err;
/* Check link capabilities */
err = drm_dp_link_probe(&anx78xx->aux, &anx78xx->link);
if (err < 0) {
DRM_ERROR("Failed to probe link capabilities: %d\n", err);
return err;
}
/* Power up the sink */
err = drm_dp_link_power_up(&anx78xx->aux, &anx78xx->link);
if (err < 0) {
DRM_ERROR("Failed to power up DisplayPort link: %d\n", err);
return err;
}
/* Possibly enable downspread on the sink */
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_DOWNSPREAD_CTRL1_REG, 0);
if (err)
return err;
if (anx78xx->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) {
DRM_DEBUG("Enable downspread on the sink\n");
/* 4000PPM */
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_DOWNSPREAD_CTRL1_REG, 8);
if (err)
return err;
err = drm_dp_dpcd_writeb(&anx78xx->aux, DP_DOWNSPREAD_CTRL,
DP_SPREAD_AMP_0_5);
if (err < 0)
return err;
} else {
err = drm_dp_dpcd_writeb(&anx78xx->aux, DP_DOWNSPREAD_CTRL, 0);
if (err < 0)
return err;
}
/* Set the lane count and the link rate on the sink */
if (drm_dp_enhanced_frame_cap(anx78xx->dpcd))
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_SYSTEM_CTRL_BASE + 4,
SP_ENHANCED_MODE);
else
err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_SYSTEM_CTRL_BASE + 4,
SP_ENHANCED_MODE);
if (err)
return err;
value = drm_dp_link_rate_to_bw_code(anx78xx->link.rate);
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
SP_DP_MAIN_LINK_BW_SET_REG, value);
if (err)
return err;
err = drm_dp_link_configure(&anx78xx->aux, &anx78xx->link);
if (err < 0) {
DRM_ERROR("Failed to configure DisplayPort link: %d\n", err);
return err;
}
/* Start training on the source */
err = regmap_write(anx78xx->map[I2C_IDX_TX_P0], SP_DP_LT_CTRL_REG,
SP_LT_EN);
if (err)
return err;
return 0;
}
static int anx78xx_config_dp_output(struct anx78xx *anx78xx)
{
int err;
err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P2], SP_VID_CTRL1_REG,
SP_VIDEO_MUTE);
if (err)
return err;
/* Enable DP output */
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P2], SP_VID_CTRL1_REG,
SP_VIDEO_EN);
if (err)
return err;
return 0;
}
static int anx78xx_send_video_infoframe(struct anx78xx *anx78xx,
struct hdmi_avi_infoframe *frame)
{
u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_AVI_INFOFRAME_SIZE];
int err;
err = hdmi_avi_infoframe_pack(frame, buffer, sizeof(buffer));
if (err < 0) {
DRM_ERROR("Failed to pack AVI infoframe: %d\n", err);
return err;
}
err = anx78xx_clear_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_PACKET_SEND_CTRL_REG, SP_AVI_IF_EN);
if (err)
return err;
err = regmap_bulk_write(anx78xx->map[I2C_IDX_TX_P2],
SP_INFOFRAME_AVI_DB1_REG, buffer,
frame->length);
if (err)
return err;
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_PACKET_SEND_CTRL_REG, SP_AVI_IF_UD);
if (err)
return err;
err = anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P0],
SP_PACKET_SEND_CTRL_REG, SP_AVI_IF_EN);
if (err)
return err;
return 0;
}
static int anx78xx_get_downstream_info(struct anx78xx *anx78xx)
{
u8 value;
int err;
err = drm_dp_dpcd_readb(&anx78xx->aux, DP_SINK_COUNT, &value);
if (err < 0) {
DRM_ERROR("Get sink count failed %d\n", err);
return err;
}
if (!DP_GET_SINK_COUNT(value)) {
DRM_ERROR("Downstream disconnected\n");
return -EIO;
}
return 0;
}
static int anx78xx_get_modes(struct drm_connector *connector)
{
struct anx78xx *anx78xx = connector_to_anx78xx(connector);
int err, num_modes = 0;
if (WARN_ON(!anx78xx->powered))
return 0;
if (anx78xx->edid)
return drm_add_edid_modes(connector, anx78xx->edid);
mutex_lock(&anx78xx->lock);
err = anx78xx_get_downstream_info(anx78xx);
if (err) {
DRM_ERROR("Failed to get downstream info: %d\n", err);
goto unlock;
}
anx78xx->edid = drm_get_edid(connector, &anx78xx->aux.ddc);
if (!anx78xx->edid) {
DRM_ERROR("Failed to read EDID\n");
goto unlock;
}
err = drm_mode_connector_update_edid_property(connector,
anx78xx->edid);
if (err) {
DRM_ERROR("Failed to update EDID property: %d\n", err);
goto unlock;
}
num_modes = drm_add_edid_modes(connector, anx78xx->edid);
/* Store the ELD */
drm_edid_to_eld(connector, anx78xx->edid);
unlock:
mutex_unlock(&anx78xx->lock);
return num_modes;
}
static const struct drm_connector_helper_funcs anx78xx_connector_helper_funcs = {
.get_modes = anx78xx_get_modes,
};
static enum drm_connector_status anx78xx_detect(struct drm_connector *connector,
bool force)
{
struct anx78xx *anx78xx = connector_to_anx78xx(connector);
if (!gpiod_get_value(anx78xx->pdata.gpiod_hpd))
return connector_status_disconnected;
return connector_status_connected;
}
static const struct drm_connector_funcs anx78xx_connector_funcs = {
.fill_modes = drm_helper_probe_single_connector_modes,
.detect = anx78xx_detect,
.destroy = drm_connector_cleanup,
.reset = drm_atomic_helper_connector_reset,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static int anx78xx_bridge_attach(struct drm_bridge *bridge)
{
struct anx78xx *anx78xx = bridge_to_anx78xx(bridge);
int err;
if (!bridge->encoder) {
DRM_ERROR("Parent encoder object not found");
return -ENODEV;
}
/* Register aux channel */
anx78xx->aux.name = "DP-AUX";
anx78xx->aux.dev = &anx78xx->client->dev;
anx78xx->aux.transfer = anx78xx_aux_transfer;
err = drm_dp_aux_register(&anx78xx->aux);
if (err < 0) {
DRM_ERROR("Failed to register aux channel: %d\n", err);
return err;
}
err = drm_connector_init(bridge->dev, &anx78xx->connector,
&anx78xx_connector_funcs,
DRM_MODE_CONNECTOR_DisplayPort);
if (err) {
DRM_ERROR("Failed to initialize connector: %d\n", err);
return err;
}
drm_connector_helper_add(&anx78xx->connector,
&anx78xx_connector_helper_funcs);
err = drm_connector_register(&anx78xx->connector);
if (err) {
DRM_ERROR("Failed to register connector: %d\n", err);
return err;
}
anx78xx->connector.polled = DRM_CONNECTOR_POLL_HPD;
err = drm_mode_connector_attach_encoder(&anx78xx->connector,
bridge->encoder);
if (err) {
DRM_ERROR("Failed to link up connector to encoder: %d\n", err);
return err;
}
return 0;
}
static enum drm_mode_status
anx78xx_bridge_mode_valid(struct drm_bridge *bridge,
const struct drm_display_mode *mode)
{
if (mode->flags & DRM_MODE_FLAG_INTERLACE)
return MODE_NO_INTERLACE;
/* Max 1200p at 5.4 Ghz, one lane */
if (mode->clock > 154000)
return MODE_CLOCK_HIGH;
return MODE_OK;
}
static void anx78xx_bridge_disable(struct drm_bridge *bridge)
{
struct anx78xx *anx78xx = bridge_to_anx78xx(bridge);
/* Power off all modules except configuration registers access */
anx78xx_set_bits(anx78xx->map[I2C_IDX_TX_P2], SP_POWERDOWN_CTRL_REG,
SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
}
static void anx78xx_bridge_mode_set(struct drm_bridge *bridge,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct anx78xx *anx78xx = bridge_to_anx78xx(bridge);
struct hdmi_avi_infoframe frame;
int err;
if (WARN_ON(!anx78xx->powered))
return;
mutex_lock(&anx78xx->lock);
err = drm_hdmi_avi_infoframe_from_display_mode(&frame, adjusted_mode,
false);
if (err) {
DRM_ERROR("Failed to setup AVI infoframe: %d\n", err);
goto unlock;
}
err = anx78xx_send_video_infoframe(anx78xx, &frame);
if (err)
DRM_ERROR("Failed to send AVI infoframe: %d\n", err);
unlock:
mutex_unlock(&anx78xx->lock);
}
static void anx78xx_bridge_enable(struct drm_bridge *bridge)
{
struct anx78xx *anx78xx = bridge_to_anx78xx(bridge);
int err;
err = anx78xx_start(anx78xx);
if (err) {
DRM_ERROR("Failed to initialize: %d\n", err);
return;
}
err = anx78xx_set_hpd(anx78xx);
if (err)
DRM_ERROR("Failed to set HPD: %d\n", err);
}
static const struct drm_bridge_funcs anx78xx_bridge_funcs = {
.attach = anx78xx_bridge_attach,
.mode_valid = anx78xx_bridge_mode_valid,
.disable = anx78xx_bridge_disable,
.mode_set = anx78xx_bridge_mode_set,
.enable = anx78xx_bridge_enable,
};
static irqreturn_t anx78xx_hpd_threaded_handler(int irq, void *data)
{
struct anx78xx *anx78xx = data;
int err;
if (anx78xx->powered)
return IRQ_HANDLED;
mutex_lock(&anx78xx->lock);
/* Cable is pulled, power on the chip */
anx78xx_poweron(anx78xx);
err = anx78xx_enable_interrupts(anx78xx);
if (err)
DRM_ERROR("Failed to enable interrupts: %d\n", err);
mutex_unlock(&anx78xx->lock);
return IRQ_HANDLED;
}
static int anx78xx_handle_dp_int_1(struct anx78xx *anx78xx, u8 irq)
{
int err;
DRM_DEBUG_KMS("Handle DP interrupt 1: %02x\n", irq);
err = regmap_write(anx78xx->map[I2C_IDX_TX_P2], SP_DP_INT_STATUS1_REG,
irq);
if (err)
return err;
if (irq & SP_TRAINING_FINISH) {
DRM_DEBUG_KMS("IRQ: hardware link training finished\n");
err = anx78xx_config_dp_output(anx78xx);
}
return err;
}
static bool anx78xx_handle_common_int_4(struct anx78xx *anx78xx, u8 irq)
{
bool event = false;
int err;
DRM_DEBUG_KMS("Handle common interrupt 4: %02x\n", irq);
err = regmap_write(anx78xx->map[I2C_IDX_TX_P2],
SP_COMMON_INT_STATUS4_REG, irq);
if (err) {
DRM_ERROR("Failed to write SP_COMMON_INT_STATUS4 %d\n", err);
return event;
}
if (irq & SP_HPD_LOST) {
DRM_DEBUG_KMS("IRQ: Hot plug detect - cable is pulled out\n");
event = true;
anx78xx_poweroff(anx78xx);
/* Free cached EDID */
kfree(anx78xx->edid);
anx78xx->edid = NULL;
} else if (irq & SP_HPD_PLUG) {
DRM_DEBUG_KMS("IRQ: Hot plug detect - cable plug\n");
event = true;
}
return event;
}
static void anx78xx_handle_hdmi_int_1(struct anx78xx *anx78xx, u8 irq)
{
unsigned int value;
int err;
DRM_DEBUG_KMS("Handle HDMI interrupt 1: %02x\n", irq);
err = regmap_write(anx78xx->map[I2C_IDX_RX_P0], SP_INT_STATUS1_REG,
irq);
if (err) {
DRM_ERROR("Write HDMI int 1 failed: %d\n", err);
return;
}
if ((irq & SP_CKDT_CHG) || (irq & SP_SCDT_CHG)) {
DRM_DEBUG_KMS("IRQ: HDMI input detected\n");
err = regmap_read(anx78xx->map[I2C_IDX_RX_P0],
SP_SYSTEM_STATUS_REG, &value);
if (err) {
DRM_ERROR("Read system status reg failed: %d\n", err);
return;
}
if (!(value & SP_TMDS_CLOCK_DET)) {
DRM_DEBUG_KMS("IRQ: *** Waiting for HDMI clock ***\n");
return;
}
if (!(value & SP_TMDS_DE_DET)) {
DRM_DEBUG_KMS("IRQ: *** Waiting for HDMI signal ***\n");
return;
}
err = anx78xx_dp_link_training(anx78xx);
if (err)
DRM_ERROR("Failed to start link training: %d\n", err);
}
}
static irqreturn_t anx78xx_intp_threaded_handler(int unused, void *data)
{
struct anx78xx *anx78xx = data;
bool event = false;
unsigned int irq;
int err;
mutex_lock(&anx78xx->lock);
err = regmap_read(anx78xx->map[I2C_IDX_TX_P2], SP_DP_INT_STATUS1_REG,
&irq);
if (err) {
DRM_ERROR("Failed to read DP interrupt 1 status: %d\n", err);
goto unlock;
}
if (irq)
anx78xx_handle_dp_int_1(anx78xx, irq);
err = regmap_read(anx78xx->map[I2C_IDX_TX_P2],
SP_COMMON_INT_STATUS4_REG, &irq);
if (err) {
DRM_ERROR("Failed to read common interrupt 4 status: %d\n",
err);
goto unlock;
}
if (irq)
event = anx78xx_handle_common_int_4(anx78xx, irq);
/* Make sure we are still powered after handle HPD events */
if (!anx78xx->powered)
goto unlock;
err = regmap_read(anx78xx->map[I2C_IDX_RX_P0], SP_INT_STATUS1_REG,
&irq);
if (err) {
DRM_ERROR("Failed to read HDMI int 1 status: %d\n", err);
goto unlock;
}
if (irq)
anx78xx_handle_hdmi_int_1(anx78xx, irq);
unlock:
mutex_unlock(&anx78xx->lock);
if (event)
drm_helper_hpd_irq_event(anx78xx->connector.dev);
return IRQ_HANDLED;
}
static void unregister_i2c_dummy_clients(struct anx78xx *anx78xx)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(anx78xx->i2c_dummy); i++)
if (anx78xx->i2c_dummy[i])
i2c_unregister_device(anx78xx->i2c_dummy[i]);
}
static const struct regmap_config anx78xx_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
static const u16 anx78xx_chipid_list[] = {
0x7812,
0x7814,
0x7818,
};
static int anx78xx_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct anx78xx *anx78xx;
struct anx78xx_platform_data *pdata;
unsigned int i, idl, idh, version;
bool found = false;
int err;
anx78xx = devm_kzalloc(&client->dev, sizeof(*anx78xx), GFP_KERNEL);
if (!anx78xx)
return -ENOMEM;
pdata = &anx78xx->pdata;
mutex_init(&anx78xx->lock);
#if IS_ENABLED(CONFIG_OF)
anx78xx->bridge.of_node = client->dev.of_node;
#endif
anx78xx->client = client;
i2c_set_clientdata(client, anx78xx);
err = anx78xx_init_pdata(anx78xx);
if (err) {
DRM_ERROR("Failed to initialize pdata: %d\n", err);
return err;
}
pdata->hpd_irq = gpiod_to_irq(pdata->gpiod_hpd);
if (pdata->hpd_irq < 0) {
DRM_ERROR("Failed to get HPD IRQ: %d\n", pdata->hpd_irq);
return -ENODEV;
}
pdata->intp_irq = client->irq;
if (!pdata->intp_irq) {
DRM_ERROR("Failed to get CABLE_DET and INTP IRQ\n");
return -ENODEV;
}
/* Map slave addresses of ANX7814 */
for (i = 0; i < I2C_NUM_ADDRESSES; i++) {
anx78xx->i2c_dummy[i] = i2c_new_dummy(client->adapter,
anx78xx_i2c_addresses[i] >> 1);
if (!anx78xx->i2c_dummy[i]) {
err = -ENOMEM;
DRM_ERROR("Failed to reserve I2C bus %02x\n",
anx78xx_i2c_addresses[i]);
goto err_unregister_i2c;
}
anx78xx->map[i] = devm_regmap_init_i2c(anx78xx->i2c_dummy[i],
&anx78xx_regmap_config);
if (IS_ERR(anx78xx->map[i])) {
err = PTR_ERR(anx78xx->map[i]);
DRM_ERROR("Failed regmap initialization %02x\n",
anx78xx_i2c_addresses[i]);
goto err_unregister_i2c;
}
}
/* Look for supported chip ID */
anx78xx_poweron(anx78xx);
err = regmap_read(anx78xx->map[I2C_IDX_TX_P2], SP_DEVICE_IDL_REG,
&idl);
if (err)
goto err_poweroff;
err = regmap_read(anx78xx->map[I2C_IDX_TX_P2], SP_DEVICE_IDH_REG,
&idh);
if (err)
goto err_poweroff;
anx78xx->chipid = (u8)idl | ((u8)idh << 8);
err = regmap_read(anx78xx->map[I2C_IDX_TX_P2], SP_DEVICE_VERSION_REG,
&version);
if (err)
goto err_poweroff;
for (i = 0; i < ARRAY_SIZE(anx78xx_chipid_list); i++) {
if (anx78xx->chipid == anx78xx_chipid_list[i]) {
DRM_INFO("Found ANX%x (ver. %d) SlimPort Transmitter\n",
anx78xx->chipid, version);
found = true;
break;
}
}
if (!found) {
DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n",
anx78xx->chipid, version);
err = -ENODEV;
goto err_poweroff;
}
err = devm_request_threaded_irq(&client->dev, pdata->hpd_irq, NULL,
anx78xx_hpd_threaded_handler,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
"anx78xx-hpd", anx78xx);
if (err) {
DRM_ERROR("Failed to request CABLE_DET threaded IRQ: %d\n",
err);
goto err_poweroff;
}
err = devm_request_threaded_irq(&client->dev, pdata->intp_irq, NULL,
anx78xx_intp_threaded_handler,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
"anx78xx-intp", anx78xx);
if (err) {
DRM_ERROR("Failed to request INTP threaded IRQ: %d\n", err);
goto err_poweroff;
}
anx78xx->bridge.funcs = &anx78xx_bridge_funcs;
drm_bridge_add(&anx78xx->bridge);
/* If cable is pulled out, just poweroff and wait for HPD event */
if (!gpiod_get_value(anx78xx->pdata.gpiod_hpd))
anx78xx_poweroff(anx78xx);
return 0;
err_poweroff:
anx78xx_poweroff(anx78xx);
err_unregister_i2c:
unregister_i2c_dummy_clients(anx78xx);
return err;
}
static int anx78xx_i2c_remove(struct i2c_client *client)
{
struct anx78xx *anx78xx = i2c_get_clientdata(client);
drm_bridge_remove(&anx78xx->bridge);
unregister_i2c_dummy_clients(anx78xx);
kfree(anx78xx->edid);
return 0;
}
static const struct i2c_device_id anx78xx_id[] = {
{ "anx7814", 0 },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, anx78xx_id);
#if IS_ENABLED(CONFIG_OF)
static const struct of_device_id anx78xx_match_table[] = {
{ .compatible = "analogix,anx7814", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, anx78xx_match_table);
#endif
static struct i2c_driver anx78xx_driver = {
.driver = {
.name = "anx7814",
.of_match_table = of_match_ptr(anx78xx_match_table),
},
.probe = anx78xx_i2c_probe,
.remove = anx78xx_i2c_remove,
.id_table = anx78xx_id,
};
module_i2c_driver(anx78xx_driver);
MODULE_DESCRIPTION("ANX78xx SlimPort Transmitter driver");
MODULE_AUTHOR("Enric Balletbo i Serra <enric.balletbo@collabora.com>");
MODULE_LICENSE("GPL v2");