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linux_dsm_epyc7002/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
Laurent Pinchart a25b988ff8 drm/bridge: Extend bridge API to disable connector creation 
Most bridge drivers create a DRM connector to model the connector at the
output of the bridge. This model is historical and has worked pretty
well so far, but causes several issues:

- It prevents supporting more complex display pipelines where DRM
connector operations are split over multiple components. For instance a
pipeline with a bridge connected to the DDC signals to read EDID data,
and another one connected to the HPD signal to detect connection and
disconnection, will not be possible to support through this model.

- It requires every bridge driver to implement similar connector
handling code, resulting in code duplication.

- It assumes that a bridge will either be wired to a connector or to
another bridge, but doesn't support bridges that can be used in both
positions very well (although there is some ad-hoc support for this in
the analogix_dp bridge driver).

In order to solve these issues, ownership of the connector should be
moved to the display controller driver (where it can be implemented
using helpers provided by the core).

Extend the bridge API to allow disabling connector creation in bridge
drivers as a first step towards the new model. The new flags argument to
the bridge .attach() operation allows instructing the bridge driver to
skip creating a connector. Unconditionally set the new flags argument to
0 for now to keep the existing behaviour, and modify all existing bridge
drivers to return an error when connector creation is not requested as
they don't support this feature yet.

The change is based on the following semantic patch, with manual review
and edits.

@ rule1 @
identifier funcs;
identifier fn;
@@
 struct drm_bridge_funcs funcs = {
 	...,
 	.attach = fn
 };

@ depends on rule1 @
identifier rule1.fn;
identifier bridge;
statement S, S1;
@@
 int fn(
 	struct drm_bridge *bridge
+	, enum drm_bridge_attach_flags flags
 )
 {
 	... when != S
+	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
+		DRM_ERROR("Fix bridge driver to make connector optional!");
+		return -EINVAL;
+	}
+
 	S1
 	...
 }

@ depends on rule1 @
identifier rule1.fn;
identifier bridge, flags;
expression E1, E2, E3;
@@
 int fn(
 	struct drm_bridge *bridge,
 	enum drm_bridge_attach_flags flags
 ) {
 <...
 drm_bridge_attach(E1, E2, E3
+	, flags
 )
 ...>
 }

@@
expression E1, E2, E3;
@@
 drm_bridge_attach(E1, E2, E3
+	, 0
 )

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200226112514.12455-10-laurent.pinchart@ideasonboard.com
2020-02-26 13:31:23 +02:00

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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_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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