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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright(c) 2016, Analogix Semiconductor.
- *
- * Based on anx7808 driver obtained from chromeos with copyright:
- * Copyright(c) 2013, Google Inc.
- */
- #include <linux/delay.h>
- #include <linux/err.h>
- #include <linux/gpio/consumer.h>
- #include <linux/i2c.h>
- #include <linux/interrupt.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/of_irq.h>
- #include <linux/of_platform.h>
- #include <linux/regmap.h>
- #include <linux/regulator/consumer.h>
- #include <linux/types.h>
- #include <drm/drm_atomic_helper.h>
- #include <drm/drm_bridge.h>
- #include <drm/drm_crtc.h>
- #include <drm/drm_dp_helper.h>
- #include <drm/drm_edid.h>
- #include <drm/drm_print.h>
- #include <drm/drm_probe_helper.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 */
- static const u8 anx7808_i2c_addresses[] = {
- [I2C_IDX_TX_P0] = 0x78,
- [I2C_IDX_TX_P1] = 0x7a,
- [I2C_IDX_TX_P2] = 0x72,
- [I2C_IDX_RX_P0] = 0x7e,
- [I2C_IDX_RX_P1] = 0x80,
- };
- static const u8 anx781x_i2c_addresses[] = {
- [I2C_IDX_TX_P0] = 0x70,
- [I2C_IDX_TX_P1] = 0x7a,
- [I2C_IDX_TX_P2] = 0x72,
- [I2C_IDX_RX_P0] = 0x7e,
- [I2C_IDX_RX_P1] = 0x80,
- };
- 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 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 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);
- return anx_dp_aux_transfer(anx78xx->map[I2C_IDX_TX_P0], msg);
- }
- 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)) {
- if (PTR_ERR(pdata->dvdd10) != -EPROBE_DEFER)
- 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, dpcd[2];
- 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;
- /*
- * Power up the sink (DP_SET_POWER register is only available on DPCD
- * v1.1 and later).
- */
- if (anx78xx->dpcd[DP_DPCD_REV] >= 0x11) {
- err = drm_dp_dpcd_readb(&anx78xx->aux, DP_SET_POWER, &dpcd[0]);
- if (err < 0) {
- DRM_ERROR("Failed to read DP_SET_POWER register: %d\n",
- err);
- return err;
- }
- dpcd[0] &= ~DP_SET_POWER_MASK;
- dpcd[0] |= DP_SET_POWER_D0;
- err = drm_dp_dpcd_writeb(&anx78xx->aux, DP_SET_POWER, dpcd[0]);
- if (err < 0) {
- DRM_ERROR("Failed to power up DisplayPort link: %d\n",
- err);
- return err;
- }
- /*
- * According to the DP 1.1 specification, a "Sink Device must
- * exit the power saving state within 1 ms" (Section 2.5.3.1,
- * Table 5-52, "Sink Control Field" (register 0x600).
- */
- usleep_range(1000, 2000);
- }
- /* 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;
- err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
- SP_DP_MAIN_LINK_BW_SET_REG,
- anx78xx->dpcd[DP_MAX_LINK_RATE]);
- if (err)
- return err;
- dpcd[1] = drm_dp_max_lane_count(anx78xx->dpcd);
- if (drm_dp_enhanced_frame_cap(anx78xx->dpcd))
- dpcd[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
- err = drm_dp_dpcd_write(&anx78xx->aux, DP_LINK_BW_SET, dpcd,
- sizeof(dpcd));
- if (err < 0) {
- DRM_ERROR("Failed to configure 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_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);
- 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,
- enum drm_bridge_attach_flags flags)
- {
- struct anx78xx *anx78xx = bridge_to_anx78xx(bridge);
- int err;
- if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
- DRM_ERROR("Fix bridge driver to make connector optional!");
- return -EINVAL;
- }
- 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_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_info *info,
- 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,
- const struct drm_display_mode *mode,
- const 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,
- &anx78xx->connector,
- adjusted_mode);
- 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++)
- 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[] = {
- 0x7808,
- 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;
- const u8 *i2c_addresses;
- 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) {
- if (err != -EPROBE_DEFER)
- 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 */
- i2c_addresses = device_get_match_data(&client->dev);
- for (i = 0; i < I2C_NUM_ADDRESSES; i++) {
- struct i2c_client *i2c_dummy;
- i2c_dummy = i2c_new_dummy_device(client->adapter,
- i2c_addresses[i] >> 1);
- if (IS_ERR(i2c_dummy)) {
- err = PTR_ERR(i2c_dummy);
- DRM_ERROR("Failed to reserve I2C bus %02x: %d\n",
- i2c_addresses[i], err);
- goto err_unregister_i2c;
- }
- anx78xx->i2c_dummy[i] = i2c_dummy;
- 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",
- 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,anx7808", .data = anx7808_i2c_addresses },
- { .compatible = "analogix,anx7812", .data = anx781x_i2c_addresses },
- { .compatible = "analogix,anx7814", .data = anx781x_i2c_addresses },
- { .compatible = "analogix,anx7818", .data = anx781x_i2c_addresses },
- { /* 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");
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