Re: [PATCH v3 1/2] drm/bridge: add Silicon Image SiI9234 driver

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On Tue, Sep 05, 2017 at 04:01:38PM +0200, Maciej Purski wrote:
> SiI9234 transmitter converts eTMDS/HDMI signal to MHL 1.0.
> It is controlled via I2C bus. Its interaction with other
> devices in video pipeline is performed mainly on HW level.
> The only interaction it does on device driver level is
> filtering-out unsupported video modes, it exposes drm_bridge
> interface to perform this operation.
> 
> This patch is based on the code refactored by Tomasz Stanislawski
> <t.stanislaws@xxxxxxxxxxx>, which was initially developed by:
> Adam Hampson <ahampson@xxxxxxxxxxxxxxx>
> Erik Gilling <konkers@xxxxxxxxxxx>
> Shankar Bandal <shankar.b@xxxxxxxxxxx>
> Dharam Kumar <dharam.kr@xxxxxxxxxxx>
> 
> Signed-off-by: Maciej Purski <m.purski@xxxxxxxxxxx>
> ---
>  .../devicetree/bindings/display/bridge/sii9234.txt |  34 +
>  drivers/gpu/drm/bridge/Kconfig                     |   8 +
>  drivers/gpu/drm/bridge/Makefile                    |   1 +
>  drivers/gpu/drm/bridge/sii9234.c                   | 993 +++++++++++++++++++++
>  4 files changed, 1036 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/sii9234.txt
>  create mode 100644 drivers/gpu/drm/bridge/sii9234.c
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/sii9234.txt b/Documentation/devicetree/bindings/display/bridge/sii9234.txt
> new file mode 100644
> index 0000000..3ce7413
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/sii9234.txt
> @@ -0,0 +1,34 @@
> +Silicon Image SiI9234 HDMI/MHL bridge bindings
> +
> +Required properties:
> +	- compatible : "sil,sii9234".
> +	- reg : I2C address for TPI interface, use 0x39
> +	- avcc33-supply : MHL/USB Switch Supply Voltage (3.3V)
> +	- iovcc18-supply : I/O Supply Voltage (1.8V)
> +	- avcc12-supply : TMDS Analog Supply Voltage (1.2V)
> +	- cvcc12-supply : Digital Core Supply Voltage (1.2V)
> +	- interrupts, interrupt-parent: interrupt specifier of INT pin
> +	- reset-gpios: gpio specifier of RESET pin (active low)
> +	- video interfaces: Device node can contain video interface port
> +			    node for HDMI encoder according to [1].
> +
> +[1]: Documentation/devicetree/bindings/media/video-interfaces.txt
> +
> +Example:
> +	sii9234@39 {
> +		compatible = "sil,sii9234";
> +		reg = <0x39>;
> +		avcc33-supply = <&vcc33mhl>;
> +		iovcc18-supply = <&vcc18mhl>;
> +		avcc12-supply = <&vsil12>;
> +		cvcc12-supply = <&vsil12>;
> +		reset-gpios = <&gpf3 4 GPIO_ACTIVE_LOW>;
> +		interrupt-parent = <&gpf3>;
> +		interrupts = <5 IRQ_TYPE_LEVEL_HIGH>;
> +
> +		port {
> +			mhl_to_hdmi: endpoint {
> +				remote-endpoint = <&hdmi_to_mhl>;
> +			};
> +		};
> +	};
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index adf9ae0..9dba16fd 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -84,6 +84,14 @@ config DRM_SII902X
>  	---help---
>  	  Silicon Image sii902x bridge chip driver.
>  
> +config DRM_SII9234
> +	tristate "Silicon Image SII9234 HDMI/MHL bridge"
> +	depends on OF
> +	---help---
> +	  Say Y here if you want support for the MHL interface.
> +	  It is an I2C driver, that detects connection of MHL bridge
> +	  and starts encapsulation of HDMI signal.
> +
>  config DRM_TOSHIBA_TC358767
>  	tristate "Toshiba TC358767 eDP bridge"
>  	depends on OF
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index defcf1e..e3d5eb0 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -6,6 +6,7 @@ obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
>  obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
>  obj-$(CONFIG_DRM_SIL_SII8620) += sil-sii8620.o
>  obj-$(CONFIG_DRM_SII902X) += sii902x.o
> +obj-$(CONFIG_DRM_SII9234) += sii9234.o
>  obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
>  obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix/
>  obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
> diff --git a/drivers/gpu/drm/bridge/sii9234.c b/drivers/gpu/drm/bridge/sii9234.c
> new file mode 100644
> index 0000000..b70d69a
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/sii9234.c
> @@ -0,0 +1,993 @@
> +/*
> + * Copyright (C) 2017 Samsung Electronics
> + *
> + * Authors:
> + *    Tomasz Stanislawski <t.stanislaws@xxxxxxxxxxx>
> + *    Maciej Purski <m.purski@xxxxxxxxxxx>
> + *
> + * Based on sii9234 driver created by:
> + *    Adam Hampson <ahampson@xxxxxxxxxxxxxxx>
> + *    Erik Gilling <konkers@xxxxxxxxxxx>
> + *    Shankar Bandal <shankar.b@xxxxxxxxxxx>
> + *    Dharam Kumar <dharam.kr@xxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * 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.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program
> + *
> + */
> +#include <drm/bridge/mhl.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_edid.h>
> +
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/slab.h>
> +
> +#define CBUS_DEVCAP_OFFSET		0x80
> +
> +#define SII9234_MHL_VERSION		0x11
> +#define SII9234_SCRATCHPAD_SIZE		0x10
> +#define SII9234_INT_STAT_SIZE		0x33
> +
> +#define BIT_TMDS_CCTRL_TMDS_OE		BIT(4)
> +#define MHL_HPD_OUT_OVR_EN		BIT(4)
> +#define MHL_HPD_OUT_OVR_VAL		BIT(5)
> +#define MHL_INIT_TIMEOUT		0x0C
> +
> +/* MHL Tx registers and bits */
> +#define MHL_TX_SRST                     0x05
> +#define MHL_TX_SYSSTAT_REG              0x09
> +#define MHL_TX_INTR1_REG                0x71
> +#define MHL_TX_INTR4_REG                0x74
> +#define MHL_TX_INTR1_ENABLE_REG         0x75
> +#define MHL_TX_INTR4_ENABLE_REG         0x78
> +#define MHL_TX_INT_CTRL_REG             0x79
> +#define MHL_TX_TMDS_CCTRL               0x80
> +#define MHL_TX_DISC_CTRL1_REG           0x90
> +#define MHL_TX_DISC_CTRL2_REG           0x91
> +#define MHL_TX_DISC_CTRL3_REG           0x92
> +#define MHL_TX_DISC_CTRL4_REG		0x93
> +#define MHL_TX_DISC_CTRL5_REG           0x94
> +#define MHL_TX_DISC_CTRL6_REG           0x95
> +#define MHL_TX_DISC_CTRL7_REG           0x96
> +#define MHL_TX_DISC_CTRL8_REG		0x97
> +#define MHL_TX_STAT2_REG                0x99

                                 ^^^^^^^^
Sometimes tabs, sometimes spaces. Please make it consistent: tabs.


> +#define MHL_TX_MHLTX_CTL1_REG           0xA0
> +#define MHL_TX_MHLTX_CTL2_REG           0xA1
> +#define MHL_TX_MHLTX_CTL4_REG           0xA3
> +#define MHL_TX_MHLTX_CTL6_REG           0xA5
> +#define MHL_TX_MHLTX_CTL7_REG           0xA6
> +
> +
> +#define RSEN_STATUS			BIT(2)
> +#define HPD_CHANGE_INT			BIT(6)
> +#define RSEN_CHANGE_INT			BIT(5)
> +#define RGND_READY_INT			BIT(6)
> +#define VBUS_LOW_INT			BIT(5)
> +#define CBUS_LKOUT_INT			BIT(4)
> +#define MHL_DISC_FAIL_INT		BIT(3)
> +#define MHL_EST_INT			BIT(2)
> +#define HPD_CHANGE_INT_MASK		BIT(6)
> +#define RSEN_CHANGE_INT_MASK		BIT(5)
> +
> +#define RGND_READY_MASK			BIT(6)
> +#define CBUS_LKOUT_MASK			BIT(4)
> +#define MHL_DISC_FAIL_MASK		BIT(3)
> +#define MHL_EST_MASK			BIT(2)
> +
> +#define SKIP_GND			BIT(6)
> +
> +#define ATT_THRESH_SHIFT		0x04
> +#define ATT_THRESH_MASK			(0x03 << ATT_THRESH_SHIFT)
> +#define USB_D_OEN			BIT(3)
> +#define DEGLITCH_TIME_MASK		0x07
> +#define DEGLITCH_TIME_2MS		0
> +#define DEGLITCH_TIME_4MS		1
> +#define DEGLITCH_TIME_8MS		2
> +#define DEGLITCH_TIME_16MS		3
> +#define DEGLITCH_TIME_40MS		4
> +#define DEGLITCH_TIME_50MS		5
> +#define DEGLITCH_TIME_60MS		6
> +#define DEGLITCH_TIME_128MS		7
> +
> +#define USB_D_OVR			BIT(7)
> +#define USB_ID_OVR			BIT(6)
> +#define DVRFLT_SEL			BIT(5)
> +#define BLOCK_RGND_INT			BIT(4)
> +#define SKIP_DEG			BIT(3)
> +#define CI2CA_POL			BIT(2)
> +#define CI2CA_WKUP			BIT(1)
> +#define SINGLE_ATT			BIT(0)
> +
> +#define USB_D_ODN			BIT(5)
> +#define VBUS_CHECK			BIT(2)
> +#define RGND_INTP_MASK			0x03
> +#define RGND_INTP_OPEN			0
> +#define RGND_INTP_2K			1
> +#define RGND_INTP_1K			2
> +#define RGND_INTP_SHORT			3
> +
> +/* HDMI registers */
> +#define HDMI_RX_TMDS0_CCTRL1_REG	0x10
> +#define HDMI_RX_TMDS_CLK_EN_REG		0x11
> +#define HDMI_RX_TMDS_CH_EN_REG		0x12
> +#define HDMI_RX_PLL_CALREFSEL_REG	0x17
> +#define HDMI_RX_PLL_VCOCAL_REG		0x1A
> +#define HDMI_RX_EQ_DATA0_REG		0x22
> +#define HDMI_RX_EQ_DATA1_REG		0x23
> +#define HDMI_RX_EQ_DATA2_REG		0x24
> +#define HDMI_RX_EQ_DATA3_REG		0x25
> +#define HDMI_RX_EQ_DATA4_REG		0x26
> +#define HDMI_RX_TMDS_ZONE_CTRL_REG	0x4C
> +#define HDMI_RX_TMDS_MODE_CTRL_REG	0x4D
> +
> +/* CBUS registers */
> +#define CBUS_INT_STATUS_1_REG		0x08
> +#define CBUS_INTR1_ENABLE_REG		0x09
> +#define CBUS_MSC_REQ_ABORT_REASON_REG	0x0D
> +#define CBUS_INT_STATUS_2_REG		0x1E
> +#define CBUS_INTR2_ENABLE_REG		0x1F
> +#define CBUS_LINK_CONTROL_2_REG		0x31
> +#define CBUS_MHL_STATUS_REG_0		0xB0
> +#define CBUS_MHL_STATUS_REG_1		0xB1
> +
> +#define BIT_CBUS_RESET			BIT(3)
> +#define SET_HPD_DOWNSTREAM		BIT(6)
> +
> +/* TPI registers */
> +#define TPI_DPD_REG			0x3D
> +
> +/* timeouts */

Timeout in what kind of units?

> +#define T_SRC_VBUS_CBUS_TO_STABLE	200
> +#define T_SRC_CBUS_FLOAT		100
> +#define T_SRC_CBUS_DEGLITCH		2
> +#define T_SRC_RXSENSE_DEGLITCH		110
> +#define MHL1_MAX_CLK			75000
> +
> +/* I2C addresses */

Rather useless comment.

> +#define I2C_TPI_ADDR			0x3D
> +#define I2C_HDMI_ADDR			0x49
> +#define I2C_CBUS_ADDR			0x64
> +
> +enum sii9234_state {
> +	ST_OFF,
> +	ST_D3,
> +	ST_RGND_INIT,
> +	ST_RGND_1K,
> +	ST_RSEN_HIGH,
> +	ST_MHL_ESTABLISHED,
> +	ST_FAILURE_DISCOVERY,
> +	ST_FAILURE,
> +};
> +
> +struct sii9234 {
> +	struct i2c_client *client[4];
> +	struct drm_bridge bridge;
> +	struct device *dev;
> +	struct gpio_desc *gpio_reset;
> +	int i2c_error;
> +	struct regulator_bulk_data supplies[4];
> +
> +	enum sii9234_state state;
> +	struct mutex lock;
> +};
> +
> +enum sii9234_client_id {
> +	I2C_MHL,
> +	I2C_TPI,
> +	I2C_HDMI,
> +	I2C_CBUS,
> +};
> +
> +static char *sii9234_client_name[] = {

static const char *

> +	[I2C_MHL] = "MHL",
> +	[I2C_TPI] = "TPI",
> +	[I2C_HDMI] = "HDMI",
> +	[I2C_CBUS] = "CBUS",
> +};
> +
> +static int sii9234_writeb(struct sii9234 *ctx, int id, int offset,
> +			    int value)
> +{
> +	int ret;
> +	struct i2c_client *client = ctx->client[id];
> +
> +	if (ctx->i2c_error)
> +		return ctx->i2c_error;
> +
> +	ret = i2c_smbus_write_byte_data(client, offset, value);
> +	if (ret < 0)
> +		dev_err(ctx->dev, "writeb: %4s[0x%02x] <- 0x%02x\n",
> +			sii9234_client_name[id], offset, value);
> +	ctx->i2c_error = ret;
> +
> +	return ret;
> +}
> +
> +static int sii9234_writebm(struct sii9234 *ctx, int id, int offset,
> +			    int value, int mask)
> +{
> +	int ret;
> +	struct i2c_client *client = ctx->client[id];
> +
> +	if (ctx->i2c_error)
> +		return ctx->i2c_error;
> +
> +	ret = i2c_smbus_write_byte(client, offset);
> +	if (ret < 0) {
> +		dev_err(ctx->dev, "writebm: %4s[0x%02x] <- 0x%02x\n",
> +			sii9234_client_name[id], offset, value);
> +		ctx->i2c_error = ret;
> +		return ret;
> +	}
> +
> +	ret = i2c_smbus_read_byte(client);
> +	if (ret < 0) {
> +		dev_err(ctx->dev, "writebm: %4s[0x%02x] <- 0x%02x\n",
> +			sii9234_client_name[id], offset, value);
> +		ctx->i2c_error = ret;
> +		return ret;
> +	}
> +
> +	value = (value & mask) | (ret & ~mask);
> +
> +	ret = i2c_smbus_write_byte_data(client, offset, value);
> +	if (ret < 0) {
> +		dev_err(ctx->dev, "writebm: %4s[0x%02x] <- 0x%02x\n",
> +			sii9234_client_name[id], offset, value);
> +		ctx->i2c_error = ret;
> +	}
> +
> +	return ret;
> +}
> +
> +static int sii9234_readb(struct sii9234 *ctx, int id, int offset)
> +{
> +	int ret;
> +	struct i2c_client *client = ctx->client[id];
> +
> +	if (ctx->i2c_error)
> +		return ctx->i2c_error;
> +
> +	ret = i2c_smbus_write_byte(client, offset);
> +	if (ret < 0) {
> +		dev_err(ctx->dev, "readb: %4s[0x%02x]\n",
> +			sii9234_client_name[id], offset);
> +		ctx->i2c_error = ret;
> +		return ret;
> +	}
> +
> +	ret = i2c_smbus_read_byte(client);
> +	if (ret < 0) {
> +		dev_err(ctx->dev, "readb: %4s[0x%02x]\n",
> +			sii9234_client_name[id], offset);
> +		ctx->i2c_error = ret;
> +	}
> +
> +	return ret;
> +}
> +
> +static int sii9234_clear_error(struct sii9234 *ctx)
> +{
> +	int ret = ctx->i2c_error;
> +
> +	ctx->i2c_error = 0;
> +
> +	return ret;
> +}
> +
> +#define mhl_tx_writeb(sii9234, offset, value) \
> +	sii9234_writeb(sii9234, I2C_MHL, offset, value)
> +#define mhl_tx_writebm(sii9234, offset, value, mask) \
> +	sii9234_writebm(sii9234, I2C_MHL, offset, value, mask)
> +#define mhl_tx_readb(sii9234, offset) \
> +	sii9234_readb(sii9234, I2C_MHL, offset)
> +#define cbus_writeb(sii9234, offset, value) \
> +	sii9234_writeb(sii9234, I2C_CBUS, offset, value)
> +#define cbus_writebm(sii9234, offset, value, mask) \
> +	sii9234_writebm(sii9234, I2C_CBUS, offset, value, mask)
> +#define cbus_readb(sii9234, offset) \
> +	sii9234_readb(sii9234, I2C_CBUS, offset)
> +#define hdmi_writeb(sii9234, offset, value) \
> +	sii9234_writeb(sii9234, I2C_HDMI, offset, value)
> +#define hdmi_writebm(sii9234, offset, value, mask) \
> +	sii9234_writebm(sii9234, I2C_HDMI, offset, value, mask)
> +#define hdmi_readb(sii9234, offset) \
> +	sii9234_readb(sii9234, I2C_HDMI, offset)
> +#define tpi_writeb(sii9234, offset, value) \
> +	sii9234_writeb(sii9234, I2C_TPI, offset, value)
> +#define tpi_writebm(sii9234, offset, value, mask) \
> +	sii9234_writebm(sii9234, I2C_TPI, offset, value, mask)
> +#define tpi_readb(sii9234, offset) \
> +	sii9234_readb(sii9234, I2C_TPI, offset)
> +
> +static u8 sii9234_tmds_control(struct sii9234 *ctx, bool enable)
> +{
> +	mhl_tx_writebm(ctx, MHL_TX_TMDS_CCTRL, enable ? ~0 : 0,
> +						BIT_TMDS_CCTRL_TMDS_OE);
> +	mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, enable ? ~0 : 0,
> +				MHL_HPD_OUT_OVR_EN | MHL_HPD_OUT_OVR_VAL);
> +	return sii9234_clear_error(ctx);
> +}
> +
> +static int sii9234_cbus_reset(struct sii9234 *ctx)
> +{
> +	int i;
> +
> +	mhl_tx_writebm(ctx, MHL_TX_SRST, ~0, BIT_CBUS_RESET);
> +	msleep(T_SRC_CBUS_DEGLITCH);
> +	mhl_tx_writebm(ctx, MHL_TX_SRST, 0, BIT_CBUS_RESET);
> +
> +	for (i = 0; i < 4; i++) {
> +		/* Enable WRITE_STAT interrupt for writes to all
> +		 * 4 MSC Status registers.
> +		 */
> +		cbus_writeb(ctx, 0xE0 + i, 0xF2);
> +		/* Enable SET_INT interrupt for writes to all
> +		 * 4 MSC Interrupt registers.
> +		 */

Comments with leading /*:
/*
 * foo bar
 * bar foo
 */

Please run checkpatch and fix the warnings everywhere.

> +		cbus_writeb(ctx, 0xF0 + i, 0xF2);
> +	}
> +
> +	return sii9234_clear_error(ctx);
> +}
> +
> +/* Require to chek mhl imformation of samsung in cbus_init_register */
> +static int sii9234_cbus_init(struct sii9234 *ctx)
> +{
> +	cbus_writeb(ctx, 0x07, 0xF2);
> +	cbus_writeb(ctx, 0x40, 0x03);
> +	cbus_writeb(ctx, 0x42, 0x06);
> +	cbus_writeb(ctx, 0x36, 0x0C);
> +	cbus_writeb(ctx, 0x3D, 0xFD);
> +	cbus_writeb(ctx, 0x1C, 0x01);
> +	cbus_writeb(ctx, 0x1D, 0x0F);
> +	cbus_writeb(ctx, 0x44, 0x02);
> +	/* Setup our devcap */
> +	cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_DEV_STATE, 0x00);
> +	cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_MHL_VERSION,
> +							SII9234_MHL_VERSION);

Please align indentation with parenthesis.

> +	cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_CAT,
> +							MHL_DCAP_CAT_SOURCE);
> +	cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_ADOPTER_ID_H, 0x01);
> +	cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_ADOPTER_ID_L, 0x41);
> +
> +	cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_VID_LINK_MODE,
> +			MHL_DCAP_VID_LINK_RGB444 | MHL_DCAP_VID_LINK_YCBCR444);
> +	cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_VIDEO_TYPE,
> +							MHL_DCAP_VT_GRAPHICS);
> +	cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_LOG_DEV_MAP,
> +							MHL_DCAP_LD_GUI);
> +	cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_BANDWIDTH, 0x0F);
> +	cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_FEATURE_FLAG,
> +		    MHL_DCAP_FEATURE_RCP_SUPPORT | MHL_DCAP_FEATURE_RAP_SUPPORT
> +		   | MHL_DCAP_FEATURE_SP_SUPPORT);
> +	cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_DEVICE_ID_H, 0x0);
> +	cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_DEVICE_ID_L, 0x0);
> +	cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_SCRATCHPAD_SIZE,
> +						SII9234_SCRATCHPAD_SIZE);
> +	cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_INT_STAT_SIZE,
> +						SII9234_INT_STAT_SIZE);
> +	cbus_writeb(ctx, CBUS_DEVCAP_OFFSET + MHL_DCAP_RESERVED, 0);
> +	cbus_writebm(ctx, 0x31, 0x0C, 0x0C);
> +	cbus_writeb(ctx, 0x30, 0x01);
> +	cbus_writebm(ctx, 0x3C, 0x30, 0x38);
> +	cbus_writebm(ctx, 0x22, 0x0D, 0x0F);
> +	cbus_writebm(ctx, 0x2E, 0x15, 0x15);
> +	cbus_writeb(ctx, CBUS_INTR1_ENABLE_REG, 0);
> +	cbus_writeb(ctx, CBUS_INTR2_ENABLE_REG, 0);
> +
> +	return sii9234_clear_error(ctx);
> +}
> +
> +static void force_usb_id_switch_open(struct sii9234 *ctx)
> +{
> +	/* Disable CBUS discovery */
> +	mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, 0, 0x01);
> +	/* Force USB ID switch to open */
> +	mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, ~0, USB_ID_OVR);
> +	mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL3_REG, ~0, 0x86);
> +	/* Force upstream HPD to 0 when not in MHL mode. */
> +	mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, 0, 0x30);
> +}
> +
> +static void release_usb_id_switch_open(struct sii9234 *ctx)
> +{
> +	msleep(T_SRC_CBUS_FLOAT);
> +	/* Clear USB ID switch to open */
> +	mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, 0, USB_ID_OVR);
> +	/* Enable CBUS discovery */
> +	mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, ~0, 0x01);
> +}
> +
> +static int sii9234_power_init(struct sii9234 *ctx)
> +{
> +	/* Force the SiI9234 into the D0 state. */
> +	tpi_writeb(ctx, TPI_DPD_REG, 0x3F);
> +	/* Enable TxPLL Clock */
> +	hdmi_writeb(ctx, HDMI_RX_TMDS_CLK_EN_REG, 0x01);
> +	/* Enable Tx Clock Path & Equalizer */
> +	hdmi_writeb(ctx, HDMI_RX_TMDS_CH_EN_REG, 0x15);
> +	/* Power Up TMDS */
> +	mhl_tx_writeb(ctx, 0x08, 0x35);
> +	return sii9234_clear_error(ctx);
> +}
> +
> +static int sii9234_hdmi_init(struct sii9234 *ctx)
> +{
> +	hdmi_writeb(ctx, HDMI_RX_TMDS0_CCTRL1_REG, 0xC1);
> +	hdmi_writeb(ctx, HDMI_RX_PLL_CALREFSEL_REG, 0x03);
> +	hdmi_writeb(ctx, HDMI_RX_PLL_VCOCAL_REG, 0x20);
> +	hdmi_writeb(ctx, HDMI_RX_EQ_DATA0_REG, 0x8A);
> +	hdmi_writeb(ctx, HDMI_RX_EQ_DATA1_REG, 0x6A);
> +	hdmi_writeb(ctx, HDMI_RX_EQ_DATA2_REG, 0xAA);
> +	hdmi_writeb(ctx, HDMI_RX_EQ_DATA3_REG, 0xCA);
> +	hdmi_writeb(ctx, HDMI_RX_EQ_DATA4_REG, 0xEA);
> +	hdmi_writeb(ctx, HDMI_RX_TMDS_ZONE_CTRL_REG, 0xA0);
> +	hdmi_writeb(ctx, HDMI_RX_TMDS_MODE_CTRL_REG, 0x00);
> +	mhl_tx_writeb(ctx, MHL_TX_TMDS_CCTRL, 0x34);
> +	hdmi_writeb(ctx, 0x45, 0x44);
> +	hdmi_writeb(ctx, 0x31, 0x0A);
> +	hdmi_writeb(ctx, HDMI_RX_TMDS0_CCTRL1_REG, 0xC1);
> +
> +	return sii9234_clear_error(ctx);
> +}
> +
> +static int sii9234_mhl_tx_ctl_int(struct sii9234 *ctx)
> +{
> +	mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL1_REG, 0xD0);
> +	mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL2_REG, 0xFC);
> +	mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL4_REG, 0xEB);
> +	mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL7_REG, 0x0C);
> +
> +	return sii9234_clear_error(ctx);
> +}
> +
> +static int sii9234_reset(struct sii9234 *ctx)
> +{
> +	int ret;
> +
> +	sii9234_clear_error(ctx);
> +
> +	ret = sii9234_power_init(ctx);
> +	if (ret < 0)
> +		return ret;
> +	ret = sii9234_cbus_reset(ctx);
> +	if (ret < 0)
> +		return ret;
> +	ret = sii9234_hdmi_init(ctx);
> +	if (ret < 0)
> +		return ret;
> +	ret = sii9234_mhl_tx_ctl_int(ctx);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* Enable HDCP Compliance safety */
> +	mhl_tx_writeb(ctx, 0x2B, 0x01);
> +	/* CBUS discovery cycle time for each drive and float = 150us */
> +	mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, 0x04, 0x06);
> +	/* Clear bit 6 (reg_skip_rgnd) */
> +	mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL2_REG, (1 << 7) /* Reserved */
> +		| 2 << ATT_THRESH_SHIFT | DEGLITCH_TIME_50MS);
> +	/* Changed from 66 to 65 for 94[1:0] = 01 = 5k reg_cbusmhl_pup_sel
> +	 * 1.8V CBUS VTH & GND threshold
> +	 * to meet CTS 3.3.7.2 spec
> +	 */
> +	mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL5_REG, 0x77);
> +	cbus_writebm(ctx, CBUS_LINK_CONTROL_2_REG, ~0, MHL_INIT_TIMEOUT);
> +	mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL6_REG, 0xA0);
> +	/* RGND & single discovery attempt (RGND blocking) */
> +	mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL6_REG, BLOCK_RGND_INT |
> +			       DVRFLT_SEL | SINGLE_ATT);
> +	/* Use VBUS path of discovery state machine */
> +	mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL8_REG, 0);
> +	/* 0x92[3] sets the CBUS / ID switch */
> +	mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, ~0, USB_ID_OVR);
> +	/* To allow RGND engine to operate correctly.
> +	 * When moving the chip from D2 to D0 (power up, init regs)
> +	 * the values should be
> +	 * 94[1:0] = 01  reg_cbusmhl_pup_sel[1:0] should be set for 5k
> +	 * 93[7:6] = 10  reg_cbusdisc_pup_sel[1:0] should be
> +	 * set for 10k (default)
> +	 * 93[5:4] = 00  reg_cbusidle_pup_sel[1:0] = open (default)
> +	 */
> +	mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL3_REG, ~0, 0x86);
> +	/* Change from CC to 8C to match 5K
> +	 * to meet CTS 3.3.72 spec
> +	 */
> +	mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL4_REG, ~0, 0x8C);
> +	/* Configure the interrupt as active high */
> +	mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, 0, 0x06);
> +
> +	msleep(25);
> +
> +	/* Release usb_id switch */
> +	mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, 0,  USB_ID_OVR);
> +	mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL1_REG, 0x27);
> +
> +	ret = sii9234_clear_error(ctx);
> +	if (ret < 0)
> +		return ret;
> +	ret = sii9234_cbus_init(ctx);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* Enable Auto soft reset on SCDT = 0 */
> +	mhl_tx_writeb(ctx, 0x05, 0x04);
> +	/* HDMI Transcode mode enable */
> +	mhl_tx_writeb(ctx, 0x0D, 0x1C);
> +	mhl_tx_writeb(ctx, MHL_TX_INTR4_ENABLE_REG,
> +			       RGND_READY_MASK | CBUS_LKOUT_MASK |
> +			       MHL_DISC_FAIL_MASK | MHL_EST_MASK);
> +	mhl_tx_writeb(ctx, MHL_TX_INTR1_ENABLE_REG, 0x60);
> +
> +	/* This point is very important before measure RGND impedance */
> +	force_usb_id_switch_open(ctx);
> +	mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL4_REG, 0, 0xF0);
> +	mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL5_REG, 0, 0x03);
> +	release_usb_id_switch_open(ctx);
> +
> +	/* Force upstream HPD to 0 when not in MHL mode */
> +	mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, 0, 1 << 5);
> +	mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, ~0, 1 << 4);
> +
> +	return sii9234_clear_error(ctx);
> +}
> +
> +static int sii9234_goto_d3(struct sii9234 *ctx)
> +{
> +	int ret;
> +
> +	dev_dbg(ctx->dev, "sii9234: detection started d3\n");
> +
> +	ret = sii9234_reset(ctx);
> +	if (ret < 0)
> +		goto exit;
> +
> +	hdmi_writeb(ctx, 0x01, 0x03);
> +	tpi_writebm(ctx, TPI_DPD_REG, 0, 1);
> +	/* I2C above is expected to fail because power goes down */
> +	sii9234_clear_error(ctx);
> +
> +	ctx->state = ST_D3;
> +
> +	return 0;
> + exit:
> +	dev_err(ctx->dev, "%s failed\n", __func__);
> +	return -1;
> +}
> +
> +static int sii9234_hw_on(struct sii9234 *ctx)
> +{
> +	return regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +}
> +
> +static void sii9234_hw_off(struct sii9234 *ctx)
> +{
> +	gpiod_set_value(ctx->gpio_reset, 1);
> +	usleep_range(10000, 20000);

These are big enough for msleep, unless precise wakeup within 10-20 ms
is required?

> +	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +}
> +
> +static void sii9234_hw_reset(struct sii9234 *ctx)
> +{
> +	gpiod_set_value(ctx->gpio_reset, 1);
> +	usleep_range(10000, 20000);

Same.

> +	gpiod_set_value(ctx->gpio_reset, 0);
> +}
> +
> +static void sii9234_cable_in(struct sii9234 *ctx)
> +{
> +	int ret;
> +
> +	mutex_lock(&ctx->lock);
> +	if (ctx->state != ST_OFF)
> +		goto unlock;
> +	ret = sii9234_hw_on(ctx);
> +	if (ret < 0)
> +		goto unlock;
> +
> +	sii9234_hw_reset(ctx);
> +	sii9234_goto_d3(ctx);
> +	/* To avoid irq storm, when hw is in meta state */
> +	enable_irq(to_i2c_client(ctx->dev)->irq);
> +
> +unlock:
> +	mutex_unlock(&ctx->lock);
> +}
> +
> +static void sii9234_cable_out(struct sii9234 *ctx)
> +{
> +	mutex_lock(&ctx->lock);
> +
> +	if (ctx->state == ST_OFF)
> +		goto unlock;
> +
> +	disable_irq(to_i2c_client(ctx->dev)->irq);
> +	tpi_writeb(ctx, TPI_DPD_REG, 0);
> +	/* Turn on&off hpd festure for only QCT HDMI */
> +	sii9234_hw_off(ctx);
> +
> +	ctx->state = ST_OFF;
> +
> +unlock:
> +	mutex_unlock(&ctx->lock);
> +}
> +
> +static enum sii9234_state sii9234_rgnd_ready_irq(struct sii9234 *ctx)
> +{
> +	int value;
> +
> +	if (ctx->state == ST_D3) {
> +		int ret;
> +
> +		dev_dbg(ctx->dev, "RGND_READY_INT\n");
> +		sii9234_hw_reset(ctx);
> +
> +		ret = sii9234_reset(ctx);
> +		if (ret < 0) {
> +			dev_err(ctx->dev, "sii9234_reset() failed\n");
> +			return ST_FAILURE;
> +		}
> +
> +		return ST_RGND_INIT;
> +	}
> +
> +	/* Got interrupt in inappropriate state */
> +	if (ctx->state != ST_RGND_INIT)
> +		return ST_FAILURE;
> +
> +	value = mhl_tx_readb(ctx, MHL_TX_STAT2_REG);
> +	if (sii9234_clear_error(ctx))
> +		return ST_FAILURE;
> +
> +	if ((value & RGND_INTP_MASK) != RGND_INTP_1K) {
> +		dev_warn(ctx->dev, "RGND is not 1k\n");
> +		return ST_RGND_INIT;
> +	}
> +	dev_dbg(ctx->dev, "RGND 1K!!\n");
> +	mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL4_REG, ~0, 0x8C);
> +	mhl_tx_writeb(ctx, MHL_TX_DISC_CTRL5_REG, 0x77);
> +	mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL6_REG, ~0, 0x05);
> +	if (sii9234_clear_error(ctx))
> +		return ST_FAILURE;
> +
> +	usleep_range(T_SRC_VBUS_CBUS_TO_STABLE * USEC_PER_MSEC,
> +		     T_SRC_VBUS_CBUS_TO_STABLE * USEC_PER_MSEC);

usleep for 200ms?

Pretty long... maybe msleep()?

> +
> +	return ST_RGND_1K;
> +}
> +
> +static enum sii9234_state sii9234_mhl_established(struct sii9234 *ctx)
> +{
> +	dev_dbg(ctx->dev, "mhl est interrupt\n");
> +
> +	/* Discovery override */
> +	mhl_tx_writeb(ctx, MHL_TX_MHLTX_CTL1_REG, 0x10);
> +	/* Increase DDC translation layer timer (byte mode) */
> +	cbus_writeb(ctx, 0x07, 0x32);
> +	cbus_writebm(ctx, 0x44, ~0, 1 << 1);
> +	/* Keep the discovery enabled. Need RGND interrupt */
> +	mhl_tx_writebm(ctx, MHL_TX_DISC_CTRL1_REG, ~0, 1);
> +	mhl_tx_writeb(ctx, MHL_TX_INTR1_ENABLE_REG,
> +	       RSEN_CHANGE_INT_MASK | HPD_CHANGE_INT_MASK);
> +
> +	if (sii9234_clear_error(ctx))
> +		return ST_FAILURE;
> +
> +	return ST_MHL_ESTABLISHED;
> +}
> +
> +static enum sii9234_state sii9234_hpd_change(struct sii9234 *ctx)
> +{
> +	int value;
> +
> +	value = cbus_readb(ctx, CBUS_MSC_REQ_ABORT_REASON_REG);
> +	if (sii9234_clear_error(ctx))
> +		return ST_FAILURE;
> +
> +	if (value & SET_HPD_DOWNSTREAM) {
> +		/* Downstream HPD High, Enable TMDS */
> +		sii9234_tmds_control(ctx, true);
> +	} else {
> +		/* Downstream HPD Low, Disable TMDS */
> +		sii9234_tmds_control(ctx, false);
> +	}
> +
> +	return ctx->state;
> +}
> +
> +static enum sii9234_state sii9234_rsen_change(struct sii9234 *ctx)
> +{
> +	int value;
> +
> +	/* Work_around code to handle wrong interrupt */
> +	if (ctx->state != ST_RGND_1K) {
> +		dev_err(ctx->dev, "RSEN_HIGH without RGND_1K\n");
> +		return ST_FAILURE;
> +	}
> +	value = mhl_tx_readb(ctx, MHL_TX_SYSSTAT_REG);
> +	if (value < 0)
> +		return ST_FAILURE;
> +
> +	if (value & RSEN_STATUS) {
> +		dev_dbg(ctx->dev, "MHL cable connected.. RSEN High\n");
> +		return ST_RSEN_HIGH;
> +	}
> +	dev_dbg(ctx->dev, "RSEN lost\n");
> +	/* Once RSEN loss is confirmed,we need to check
> +	 * based on cable status and chip power status,whether
> +	 * it is SINK Loss(HDMI cable not connected, TV Off)
> +	 * or MHL cable disconnection
> +	 * TODO: Define the below mhl_disconnection()
> +	 */
> +	msleep(T_SRC_RXSENSE_DEGLITCH);
> +	value = mhl_tx_readb(ctx, MHL_TX_SYSSTAT_REG);
> +	if (value < 0)
> +		return ST_FAILURE;
> +	dev_dbg(ctx->dev, "sys_stat: %x\n", value);
> +
> +	if (value & RSEN_STATUS) {
> +		dev_dbg(ctx->dev, "RSEN recovery\n");
> +		return ST_RSEN_HIGH;
> +	}
> +	dev_dbg(ctx->dev, "RSEN Really LOW\n");
> +	/* To meet CTS 3.3.22.2 spec */
> +	sii9234_tmds_control(ctx, false);
> +	force_usb_id_switch_open(ctx);
> +	release_usb_id_switch_open(ctx);
> +
> +	return ST_FAILURE;
> +}
> +
> +static irqreturn_t sii9234_irq_thread(int irq, void *data)
> +{
> +	struct sii9234 *ctx = data;
> +	int intr1, intr4;
> +	int intr1_en, intr4_en;
> +	int cbus_intr1, cbus_intr2;
> +
> +	dev_dbg(ctx->dev, "%s\n", __func__);
> +
> +	mutex_lock(&ctx->lock);
> +
> +	intr1 = mhl_tx_readb(ctx, MHL_TX_INTR1_REG);
> +	intr4 = mhl_tx_readb(ctx, MHL_TX_INTR4_REG);
> +	intr1_en = mhl_tx_readb(ctx, MHL_TX_INTR1_ENABLE_REG);
> +	intr4_en = mhl_tx_readb(ctx, MHL_TX_INTR4_ENABLE_REG);
> +	cbus_intr1 = cbus_readb(ctx, CBUS_INT_STATUS_1_REG);
> +	cbus_intr2 = cbus_readb(ctx, CBUS_INT_STATUS_2_REG);
> +
> +	if (sii9234_clear_error(ctx))
> +		goto done;
> +
> +	dev_dbg(ctx->dev, "irq %02x/%02x %02x/%02x %02x/%02x\n",
> +		 intr1, intr1_en, intr4, intr4_en, cbus_intr1, cbus_intr2);
> +
> +	if (intr4 & RGND_READY_INT)
> +		ctx->state = sii9234_rgnd_ready_irq(ctx);
> +	if (intr1 & RSEN_CHANGE_INT)
> +		ctx->state = sii9234_rsen_change(ctx);
> +	if (intr4 & MHL_EST_INT)
> +		ctx->state = sii9234_mhl_established(ctx);
> +	if (intr1 & HPD_CHANGE_INT)
> +		ctx->state = sii9234_hpd_change(ctx);
> +	if (intr4 & CBUS_LKOUT_INT)
> +		ctx->state = ST_FAILURE;
> +	if (intr4 & MHL_DISC_FAIL_INT)
> +		ctx->state = ST_FAILURE_DISCOVERY;
> +
> + done:
> +	/* Clean interrupt status and pending flags */
> +	mhl_tx_writeb(ctx, MHL_TX_INTR1_REG, intr1);
> +	mhl_tx_writeb(ctx, MHL_TX_INTR4_REG, intr4);
> +	cbus_writeb(ctx, CBUS_MHL_STATUS_REG_0, 0xFF);
> +	cbus_writeb(ctx, CBUS_MHL_STATUS_REG_1, 0xFF);
> +	cbus_writeb(ctx, CBUS_INT_STATUS_1_REG, cbus_intr1);
> +	cbus_writeb(ctx, CBUS_INT_STATUS_2_REG, cbus_intr2);
> +
> +	sii9234_clear_error(ctx);
> +
> +	if (ctx->state == ST_FAILURE) {
> +		dev_dbg(ctx->dev, "try to reset after failure\n");
> +		sii9234_hw_reset(ctx);
> +		sii9234_goto_d3(ctx);
> +	}
> +
> +	if (ctx->state == ST_FAILURE_DISCOVERY) {
> +		dev_err(ctx->dev, "discovery failed, no power for MHL?\n");
> +		tpi_writebm(ctx, TPI_DPD_REG, 0, 1);
> +		ctx->state = ST_D3;
> +	}
> +
> +	mutex_unlock(&ctx->lock);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +
> +static int sii9234_init_resources(struct sii9234 *ctx,
> +	struct i2c_client *client)
> +{
> +	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
> +	int ret;
> +
> +	if (!ctx->dev->of_node) {
> +		dev_err(ctx->dev, "not DT device\n");
> +		return -ENODEV;
> +	}
> +
> +	ctx->gpio_reset = devm_gpiod_get(ctx->dev, "reset", GPIOD_OUT_LOW);
> +	if (IS_ERR(ctx->gpio_reset)) {
> +		dev_err(ctx->dev, "failed to get reset gpio from DT\n");
> +		return PTR_ERR(ctx->gpio_reset);
> +	}
> +
> +	ctx->supplies[0].supply = "cvcc12";
> +	ctx->supplies[1].supply = "avcc33";
> +	ctx->supplies[2].supply = "iovcc18";
> +	ctx->supplies[3].supply = "avcc12";
> +	ret = devm_regulator_bulk_get(ctx->dev, 4, ctx->supplies);
> +	if (ret) {
> +		dev_err(ctx->dev, "regulator_bulk failed\n");
> +		return ret;
> +	}
> +
> +	ctx->client[I2C_MHL] = client;
> +
> +	ctx->client[I2C_TPI] = i2c_new_dummy(adapter, I2C_TPI_ADDR);
> +	if (!ctx->client[I2C_TPI]) {
> +		dev_err(ctx->dev, "failed to create TPI client\n");
> +		return -ENODEV;
> +	}
> +
> +	ctx->client[I2C_HDMI] = i2c_new_dummy(adapter, I2C_HDMI_ADDR);
> +	if (!ctx->client[I2C_HDMI]) {
> +		dev_err(ctx->dev, "failed to create HDMI RX client\n");
> +		goto fail_tpi;
> +	}
> +
> +	ctx->client[I2C_CBUS] = i2c_new_dummy(adapter, I2C_CBUS_ADDR);
> +	if (!ctx->client[I2C_CBUS]) {
> +		dev_err(ctx->dev, "failed to create CBUS client\n");
> +		goto fail_hdmi;
> +	}

You are using i2c_smbus_* calls. Why not converting to regmap_i2c? It is
preferred interface.

> +
> +	return 0;
> +
> +fail_hdmi:
> +	i2c_unregister_device(ctx->client[I2C_HDMI]);
> +fail_tpi:
> +	i2c_unregister_device(ctx->client[I2C_TPI]);
> +
> +	return -ENODEV;
> +}
> +
> +static void sii9234_deinit_resources(struct sii9234 *ctx)
> +{
> +	i2c_unregister_device(ctx->client[I2C_CBUS]);
> +	i2c_unregister_device(ctx->client[I2C_HDMI]);
> +	i2c_unregister_device(ctx->client[I2C_TPI]);
> +}
> +
> +static inline struct sii9234 *bridge_to_sii9234(struct drm_bridge *bridge)
> +{
> +	return container_of(bridge, struct sii9234, bridge);
> +}
> +
> +static enum drm_mode_status sii9234_mode_valid(struct drm_bridge *bridge,
> +					const struct drm_display_mode *mode)
> +{
> +	if (mode->clock > MHL1_MAX_CLK)
> +		return MODE_CLOCK_HIGH;
> +
> +	return MODE_OK;
> +}
> +
> +static const struct drm_bridge_funcs sii9234_bridge_funcs = {
> +	.mode_valid = sii9234_mode_valid,
> +};
> +
> +static int sii9234_probe(struct i2c_client *client,
> +					      const struct i2c_device_id *id)
> +{
> +	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
> +	struct sii9234 *ctx;
> +	struct device *dev = &client->dev;
> +	int ret;
> +
> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	ctx->dev = dev;
> +	mutex_init(&ctx->lock);
> +
> +	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
> +		dev_err(dev, "I2C adapter lacks SMBUS feature\n");
> +		return -EIO;
> +	}
> +
> +	if (!client->irq) {
> +		dev_err(dev, "no irq provided\n");
> +		return -EINVAL;
> +	}
> +
> +	irq_set_status_flags(client->irq, IRQ_NOAUTOEN);
> +	ret = devm_request_threaded_irq(dev, client->irq, NULL,
> +					sii9234_irq_thread,
> +					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
> +					"sii9234", ctx);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to install IRQ handler\n");
> +		return ret;
> +	}

You are setting up interrupts before initialization of I2C. Can the
interrupt happen in this short window?

> +
> +	ret = sii9234_init_resources(ctx, client);
> +	if (ret < 0)
> +		return ret;
> +
> +	i2c_set_clientdata(client, ctx);
> +
> +	ctx->bridge.funcs = &sii9234_bridge_funcs;
> +	ctx->bridge.of_node = dev->of_node;
> +	drm_bridge_add(&ctx->bridge);
> +
> +	sii9234_cable_in(ctx);
> +
> +	return 0;
> +}
> +
> +static int sii9234_remove(struct i2c_client *client)
> +{
> +	struct sii9234 *ctx = i2c_get_clientdata(client);
> +
> +	sii9234_cable_out(ctx);
> +	drm_bridge_remove(&ctx->bridge);
> +	sii9234_deinit_resources(ctx);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id sii9234_dt_match[] = {
> +	{ .compatible = "sil,sii9234" },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, sii9234_dt_match);
> +
> +static const struct i2c_device_id sii9234_id[] = {
> +	{ "SII9234", 0 },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(i2c, sii9234_id);
> +
> +static struct i2c_driver sii9234_driver = {
> +	.driver = {
> +		.name	= "sii9234",
> +		.of_match_table = sii9234_dt_match,
> +	},
> +	.probe		= sii9234_probe,
> +	.remove		= sii9234_remove,
> +	.id_table = sii9234_id,

Some assignments above are indented, some not...

Best regards,
Krzysztof

> +};
> +
> +module_i2c_driver(sii9234_driver);
> +MODULE_LICENSE("GPL");
> -- 
> 2.7.4
> 
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