Hi Maciej,
Thank you for the patch.
On Thursday 03 Aug 2017 09:45:22 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 | 20 +
> drivers/gpu/drm/bridge/Kconfig | 8 +
> drivers/gpu/drm/bridge/Makefile | 1 +
> drivers/gpu/drm/bridge/sii9234.c | 1019 +++++++++++++++++
> 4 files changed, 1048 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..2cdf286
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/sii9234.txt
DT reviewers might ask you to submit DT bindings as a separate patch.
> @@ -0,0 +1,20 @@
> +SiI9234 Mobile HD Link Transmitter
> +
> +Required properties:
> +- compatible : "sil,sii9234".
> +- reg : I2C address for TPI interface, use 0x39
> +- vcc-supply : regulator that supplies the chip
Is there a single power supply only ? Transceivers usually have at least one
digital and one analog power supply.
> +- interrupts, interrupt-parent: interrupt specifier of INT pin
> +- reset-gpios: gpio specifier of RESET pin
Is this mandatory to connect the reset pin to the SoC ?
You should use the OF graph DT bindings (a.k.a. ports) to describe the data
connections with the rest of the system. I'm not familiar with this chip, but
I assume it should have one input port connected to the SoC and one output
port connected to an HDMI connector DT node.
> +Additional compatible properties are also allowed.
How so ? :-)
> +
> +Example:
> + sii9234@39 {
> + compatible = "sil,sii9234";
> + reg = <0x39>;
> + vcc-supply = <&vsil>;
> + reset-gpios = <&gpf3 4 GPIO_ACTIVE_HIGH>;
> + interrupt-parent = <&gpf3>;
> + interrupts = <5 IRQ_TYPE_LEVEL_HIGH>;
> + };
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index adf9ae0..f5784e5 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -100,6 +100,14 @@ config DRM_TI_TFP410
> ---help---
> Texas Instruments TFP410 DVI/HDMI Transmitter driver
>
> +config DRM_SII9234
> + tristate "Silicon Image SII9234 Driver"
> + depends on I2C
You can depend on OF too as the driver doesn't currently support any other
method.
> + 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.
> +
> source "drivers/gpu/drm/bridge/analogix/Kconfig"
>
> source "drivers/gpu/drm/bridge/adv7511/Kconfig"
> 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..9c436e7
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/sii9234.c
> @@ -0,0 +1,1019 @@
> +/*
> + * Copyright (C) 2014 Samsung Electronics
> + *
> + * Author: Tomasz Stanislawski <t.stanislaws@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.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/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/wait.h>
> +#include <linux/file.h>
> +#include <linux/uaccess.h>
> +#include <linux/proc_fs.h>
> +#include <linux/extcon.h>
> +#include <linux/of.h>
> +#include <linux/of_gpio.h>
> +#include <linux/extcon.h>
> +#include <linux/regulator/machine.h>
Could you please order these alphabetically ?
> +
> +/* 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
> +#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 SET_HPD_DOWNSTREAM (1<<6)
> +#define CBUS_INT_STATUS_2_REG 0x1E
> +#define CBUS_INTR2_ENABLE_REG 0x1F
> +#define CBUS_LINK_CONTROL_2_REG 0x31
> +#define CBUS_DEVCAP_DEV_STATE 0x80
> +#define CBUS_DEVCAP_MHL_VERSION 0x81
> +#define CBUS_DEVCAP_DEV_CAT 0x82
> +#define CBUS_DEVCAP_ADOPTER_ID_H 0x83
> +#define CBUS_DEVCAP_ADOPTER_ID_L 0x84
> +#define CBUS_DEVCAP_VID_LINK_MODE 0x85
> +#define CBUS_DEVCAP_AUD_LINK_MODE 0x86
> +#define CBUS_DEVCAP_VIDEO_TYPE 0x87
> +#define CBUS_DEVCAP_LOG_DEV_MAP 0x88
> +#define CBUS_DEVCAP_BANDWIDTH 0x89
> +#define CBUS_DEVCAP_DEV_FEATURE_FLAG 0x8A
> +#define CBUS_DEVCAP_DEVICE_ID_H 0x8B
> +#define CBUS_DEVCAP_DEVICE_ID_L 0x8C
> +#define CBUS_DEVCAP_SCRATCHPAD_SIZE 0x8D
> +#define CBUS_DEVCAP_INT_STAT_SIZE 0x8E
> +#define CBUS_DEVCAP_RESERVED 0x8F
> +#define CBUS_MHL_STATUS_REG_0 0xB0
> +#define CBUS_MHL_STATUS_REG_1 0xB1
> +
> +/* TPI registers */
> +#define TPI_DPD_REG 0x3D
> +
> +/* timeouts */
> +#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
> +
> +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 *vcc_supply;
> +
> + enum sii9234_state state;
> + struct mutex lock;
> +};
> +
> +enum sii9234_client_id {
> + I2C_MHL,
> + I2C_TPI,
> + I2C_HDMI,
> + I2C_CBUS,
> +};
> +
> +static char *sii9234_client_name[] = {
> + [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, 0x10);
> + mhl_tx_writebm(ctx, MHL_TX_INT_CTRL_REG, enable ? ~0 : 0, 0x30);
> + return sii9234_clear_error(ctx);
> +}
> +
> +static int sii9234_cbus_reset(struct sii9234 *ctx)
> +{
> + int i;
i is never negative, you can make it an unsigned int.
> +
> + /* Reset CBUS */
> + mhl_tx_writebm(ctx, MHL_TX_SRST, ~0, 1 << 3);
> + /* CBUS deglitch - 2ms */
> + msleep(T_SRC_CBUS_DEGLITCH);
> + mhl_tx_writebm(ctx, MHL_TX_SRST, 0, 1 << 3);
> +
> + 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.
> + */
> + cbus_writeb(ctx, 0xF0 + i, 0xF2);
> + }
> +
> + return sii9234_clear_error(ctx);
> +}
> +
> +/* require to chek mhl imformation of samsung in cbus_init_register*/
You need a space before */, here and everywhere else in the driver.
> +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 */
> + /* To meet cts 6.3.10.1 spec */
> + cbus_writeb(ctx, CBUS_DEVCAP_DEV_STATE, 0x00);
> + /* mhl version 1.1 */
> + cbus_writeb(ctx, CBUS_DEVCAP_MHL_VERSION, 0x11);
> + cbus_writeb(ctx, CBUS_DEVCAP_DEV_CAT, 0x02);
> + cbus_writeb(ctx, CBUS_DEVCAP_ADOPTER_ID_H, 0x01);
> + cbus_writeb(ctx, CBUS_DEVCAP_ADOPTER_ID_L, 0x41);
> + /* YCbCr444, RGB444 */
> + cbus_writeb(ctx, CBUS_DEVCAP_VID_LINK_MODE, 0x03);
> + cbus_writeb(ctx, CBUS_DEVCAP_VIDEO_TYPE, 0);
> + cbus_writeb(ctx, CBUS_DEVCAP_LOG_DEV_MAP, 0x80);
> + cbus_writeb(ctx, CBUS_DEVCAP_BANDWIDTH, 0x0F);
> + cbus_writeb(ctx, CBUS_DEVCAP_DEV_FEATURE_FLAG, 0x07);
> + cbus_writeb(ctx, CBUS_DEVCAP_DEVICE_ID_H, 0x0);
> + cbus_writeb(ctx, CBUS_DEVCAP_DEVICE_ID_L, 0x0);
> + cbus_writeb(ctx, CBUS_DEVCAP_SCRATCHPAD_SIZE, 0x10);
> + cbus_writeb(ctx, CBUS_DEVCAP_INT_STAT_SIZE, 0x33);
> + cbus_writeb(ctx, CBUS_DEVCAP_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 */
You need a space after /*, here and everywhere else in the driver.
> + 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)
> +{
> + /* Analog PLL Control bits 5:4 = 2b00 as per char. team. */
> + hdmi_writeb(ctx, HDMI_RX_TMDS0_CCTRL1_REG, 0xC1);
No magic value, please define macros for register bits.
> + /* PLL Calrefsel */
All those comments won't be needed once you replace numerical values with
explicitly named macros.
> + hdmi_writeb(ctx, HDMI_RX_PLL_CALREFSEL_REG, 0x03);
> + /* VCO Cal */
> + hdmi_writeb(ctx, HDMI_RX_PLL_VCOCAL_REG, 0x20);
> + /* Auto EQ */
> + hdmi_writeb(ctx, HDMI_RX_EQ_DATA0_REG, 0x8A);
> + /* Auto EQ */
> + hdmi_writeb(ctx, HDMI_RX_EQ_DATA1_REG, 0x6A);
> + /* Auto EQ */
> + hdmi_writeb(ctx, HDMI_RX_EQ_DATA2_REG, 0xAA);
> + /* Auto EQ */
> + hdmi_writeb(ctx, HDMI_RX_EQ_DATA3_REG, 0xCA);
> + /* Auto EQ */
> + hdmi_writeb(ctx, HDMI_RX_EQ_DATA4_REG, 0xEA);
> + /* Manual zone */
> + hdmi_writeb(ctx, HDMI_RX_TMDS_ZONE_CTRL_REG, 0xA0);
> + /* PLL Mode Value */
> + hdmi_writeb(ctx, HDMI_RX_TMDS_MODE_CTRL_REG, 0x00);
> + mhl_tx_writeb(ctx, MHL_TX_TMDS_CCTRL, 0x34);
> + hdmi_writeb(ctx, 0x45, 0x44);
> + /* Rx PLL BW ~ 4MHz */
> + hdmi_writeb(ctx, 0x31, 0x0A);
> + /* Analog PLL Control * bits 5:4 = 2b00 as per char. team. */
> + 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);
> + /* set bit 2 and 3, which is Initiator Timeout */
> + cbus_writebm(ctx, CBUS_LINK_CONTROL_2_REG, ~0, 0x0C);
> + 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 importand before megsure RGND impedance */
s/megsure/measuring/
> + 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);
> + /*end of this */
End of what ?
> +
> + /* 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;
> +}
> +
> +#define sii9234_hw_on(sii9234) \
> + regulator_enable((sii9234)->vcc_supply)
> +
> +static void sii9234_hw_off(struct sii9234 *ctx)
> +{
> + gpiod_set_value(ctx->gpio_reset, 0);
> + usleep_range(10000, 20000);
> + gpiod_set_value(ctx->gpio_reset, 1);
> + regulator_disable(ctx->vcc_supply);
> + gpiod_set_value(ctx->gpio_reset, 0);
> +}
> +
> +static void sii9234_hw_reset(struct sii9234 *ctx)
> +{
> + gpiod_set_value(ctx->gpio_reset, 0);
> + usleep_range(10000, 20000);
> + gpiod_set_value(ctx->gpio_reset, 1);
> +}
> +
> +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);
> + enable_irq(to_i2c_client(ctx->dev)->irq);
That looks like a hack. You should enable/disable IRQs in the SII9234, there
should be no need to enable/disable them in the SoC IRQ controller. If there's
really a need to do so, you should document why.
> +
> +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 */
Some of your comments start with a capitalized word, others don't. I'd
capitalize them all for consistency.
> + 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");
> + /* After applying RGND patch, there is some issue
> + * about discovry failure
> + * This point is add to fix that problem
> + */
> + 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);
> +
> + 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) {
> + dev_info(ctx->dev, "HPD High\n");
You don't want to spam the kernel log every time a cable is plugged or
unplugged. Use dev_dbg() if you want to keep those messages for debugging, or
remove them altogether.
> + /* Downstream HPD High, Enable TMDS */
> + sii9234_tmds_control(ctx, true);
> + /*turn on&off hpd festure for only QCT HDMI */
I'm not sure what the comment relates to as there's no line of code after it.
> + } else {
> + dev_info(ctx->dev, "HPD Low\n");
> + /* 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 worng interrupt */
s/worng/wrong/
> + 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_info(ctx->dev, "MHL cable connected.. RSEN High\n");
> + return ST_RSEN_HIGH;
> + }
> + dev_info(ctx->dev, "RSEN lost\n");
Ditto, dev_dbg()
> + /* 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_info(ctx->dev, "RSEN recovery\n");
> + return ST_RSEN_HIGH;
> + }
> + dev_info(ctx->dev, "RSEN Really LOW\n");
Same here, and everywhere else in the driver.
> + /*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__);
> +
> + msleep(30);
If this is really needed you should add a comment to explain why.
> + 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_info(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);
> +
> + 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_HIGH);
> + 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->vcc_supply = devm_regulator_get(ctx->dev, "vcc");
> + if (IS_ERR(ctx->vcc_supply)) {
> + dev_err(ctx->dev, "failed to acquire regulator vcc\n");
> + return PTR_ERR(ctx->vcc_supply);
> + }
> +
> + ctx->client[I2C_MHL] = client;
> +
> + ctx->client[I2C_TPI] = i2c_new_dummy(adapter, 0x7A >> 1);
Please define macros for the secondary I2C addresses instead of using
numerical values directly.
> + 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, 0x92 >> 1);
> + 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, 0xC8 >> 1);
> + if (!ctx->client[I2C_CBUS]) {
> + dev_err(ctx->dev, "failed to create CBUS client\n");
> + goto fail_hdmi;
> + }
> +
> + 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)
> +{
> + struct sii9234 *ctx = bridge_to_sii9234(bridge);
> +
> + 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_mhl_tx_i2c_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;
> +
> + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
> + dev_err(dev, "I2C adapter lacks SMBUS feature\n");
> + return -EIO;
> + }
> +
> + mutex_init(&ctx->lock);
> +
> + ret = sii9234_init_resources(ctx, client);
> + if (ret < 0) {
> + dev_err(&client->dev, "failed to initialize sii9234
resources\n");
No need for an error message here as all error paths in
sii9234_init_resources() print a message already.
> + return ret;
> + }
> + ret = sii9234_hw_on(ctx);
> + if (ret) {
> + dev_err(&client->dev, "failed to enable power\n");
> + goto err_resource;
> + }
> + sii9234_hw_reset(ctx);
> +
> + if (!client->irq) {
> + dev_err(dev, "no irq provided\n");
> + return -EINVAL;
No need for clean up in the error path ? You can just move this check with the
I2C functionality check to avoid the need to clean up.
> + }
> + 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;
> + }
> +
> + 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;
> +
> +err_resource:
> + sii9234_deinit_resources(ctx);
> +
> + return ret;
> +}
> +
> +static int sii9234_mhl_tx_i2c_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 },
> + { },
> +};
> +
Nitpicking, I'd move this blank line after MODULE_DEVICE_TABLE(i2c,
sii9234_id);
> +MODULE_DEVICE_TABLE(i2c, sii9234_id);
> +static struct i2c_driver sii9234_driver = {
> + .driver = {
> + .name = "sii9234",
> + .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(sii9234_dt_match),
As the driver requires OF support the of_match_ptr() macro isn't needed.
> + },
> + .probe = sii9234_mhl_tx_i2c_probe,
> + .remove = sii9234_mhl_tx_i2c_remove,
> + .id_table = sii9234_id,
> +};
> +
> +module_i2c_driver(sii9234_driver);
> +MODULE_LICENSE("GPL");
--
Regards,
Laurent Pinchart
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