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Message-ID: <20171205104549.aoturlmm3s6net37@valkosipuli.retiisi.org.uk>
Date:   Tue, 5 Dec 2017 12:45:49 +0200
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Wenyou Yang <wenyou.yang@...rochip.com>
Cc:     Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        devicetree@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Hans Verkuil <hverkuil@...all.nl>,
        linux-arm-kernel@...ts.infradead.org,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Songjun Wu <songjun.wu@...rochip.com>
Subject: Re: [PATCH v6 2/2] media: i2c: Add the ov7740 image sensor driver

Hi Wenyou,

On Mon, Dec 04, 2017 at 02:58:58PM +0800, Wenyou Yang wrote:
> The ov7740 (color) image sensor is a high performance VGA CMOS
> image snesor, which supports for output formats: RAW RGB and YUV
> and image sizes: VGA, and QVGA, CIF and any size smaller.
> 
> Signed-off-by: Songjun Wu <songjun.wu@...rochip.com>
> Signed-off-by: Wenyou Yang <wenyou.yang@...rochip.com>
> ---
> 
> Changes in v6:
>  - Remove unnecessary #include <linux/init>.
>  - Remove unnecessary comments and extra newline.
>  - Add const for some structures.
>  - Add the check of the return value from regmap_write().
>  - Simplify the calling of __v4l2_ctrl_handler_setup().
>  - Add the default format initialization function.
>  - Integrate the set_power() and enable/disable the clock into
>    one function.
> 
> Changes in v5:
>  - Squash the driver and MAINTAINERS entry patches to one.
>  - Precede the driver patch with the bindings patch.
> 
> Changes in v4:
>  - Assign 'val' a initial value to avoid warning: 'val' may be
>    used uninitialized.
>  - Rename REG_REG15 to avoid warning: "REG_REG15" redefined.
> 
> Changes in v3:
>  - Put the MAINTAINERS change to a separate patch.
> 
> Changes in v2:
>  - Split off the bindings into a separate patch.
>  - Add a new entry to the MAINTAINERS file.
> 
>  MAINTAINERS                |    8 +
>  drivers/media/i2c/Kconfig  |    8 +
>  drivers/media/i2c/Makefile |    1 +
>  drivers/media/i2c/ov7740.c | 1226 ++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 1243 insertions(+)
>  create mode 100644 drivers/media/i2c/ov7740.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 7a52a66aa991..1de965009b13 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -10053,6 +10053,14 @@ S:	Maintained
>  F:	drivers/media/i2c/ov7670.c
>  F:	Documentation/devicetree/bindings/media/i2c/ov7670.txt
>  
> +OMNIVISION OV7740 SENSOR DRIVER
> +M:	Wenyou Yang <wenyou.yang@...rochip.com>
> +L:	linux-media@...r.kernel.org
> +T:	git git://linuxtv.org/media_tree.git
> +S:	Maintained
> +F:	drivers/media/i2c/ov7740.c
> +F:	Documentation/devicetree/bindings/media/i2c/ov7740.txt
> +
>  ONENAND FLASH DRIVER
>  M:	Kyungmin Park <kyungmin.park@...sung.com>
>  L:	linux-mtd@...ts.infradead.org
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index cb5d7ff82915..00b1c4c031d4 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -665,6 +665,14 @@ config VIDEO_OV7670
>  	  OV7670 VGA camera.  It currently only works with the M88ALP01
>  	  controller.
>  
> +config VIDEO_OV7740
> +	tristate "OmniVision OV7740 sensor support"
> +	depends on I2C && VIDEO_V4L2
> +	depends on MEDIA_CAMERA_SUPPORT
> +	---help---
> +	  This is a Video4Linux2 sensor-level driver for the OmniVision
> +	  OV7740 VGA camera sensor.
> +
>  config VIDEO_OV9650
>  	tristate "OmniVision OV9650/OV9652 sensor support"
>  	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index 548a9efce966..9b19ec7fcaf4 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -68,6 +68,7 @@ obj-$(CONFIG_VIDEO_OV5670) += ov5670.o
>  obj-$(CONFIG_VIDEO_OV6650) += ov6650.o
>  obj-$(CONFIG_VIDEO_OV7640) += ov7640.o
>  obj-$(CONFIG_VIDEO_OV7670) += ov7670.o
> +obj-$(CONFIG_VIDEO_OV7740) += ov7740.o
>  obj-$(CONFIG_VIDEO_OV9650) += ov9650.o
>  obj-$(CONFIG_VIDEO_OV13858) += ov13858.o
>  obj-$(CONFIG_VIDEO_MT9M032) += mt9m032.o
> diff --git a/drivers/media/i2c/ov7740.c b/drivers/media/i2c/ov7740.c
> new file mode 100644
> index 000000000000..42c25277d005
> --- /dev/null
> +++ b/drivers/media/i2c/ov7740.c
> @@ -0,0 +1,1226 @@
> +/*
> + * Copyright (c) 2017 Microchip Corporation.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License version
> + * 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + */
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/gpio.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-image-sizes.h>
> +#include <media/v4l2-subdev.h>
> +
> +#define REG_OUTSIZE_LSB 0x34
> +
> +/* OV7740 register tables */
> +#define REG_GAIN	0x00	/* Gain lower 8 bits (rest in vref) */
> +#define REG_BGAIN	0x01	/* blue gain */
> +#define REG_RGAIN	0x02	/* red gain */
> +#define REG_GGAIN	0x03	/* green gain */
> +#define REG_REG04	0x04	/* analog setting, dont change*/
> +#define REG_BAVG	0x05	/* b channel average */
> +#define REG_GAVG	0x06	/* g channel average */
> +#define REG_RAVG	0x07	/* r channel average */
> +
> +#define REG_REG0C	0x0C	/* filp enable */
> +#define REG0C_IMG_FLIP		0x80
> +#define REG0C_IMG_MIRROR	0x40
> +
> +#define REG_REG0E	0x0E	/* blc line */
> +#define REG_HAEC	0x0F	/* auto exposure cntrl */
> +#define REG_AEC		0x10	/* auto exposure cntrl */
> +
> +#define REG_CLK		0x11	/* Clock control */
> +#define REG_REG55	0x55	/* Clock PLL DIV/PreDiv */
> +
> +#define REG_REG12	0x12
> +
> +#define REG_REG13	0x13	/* auto/manual AGC, AEC, Write Balance*/
> +#define REG13_AEC_EN	0x01
> +#define REG13_AGC_EN	0x04
> +
> +#define REG_REG14	0x14
> +#define REG_CTRL15	0x15
> +#define REG15_GAIN_MSB	0x03
> +
> +#define REG_REG16	0x16
> +
> +#define REG_MIDH	0x1C	/* manufacture id byte */
> +#define REG_MIDL	0x1D	/* manufacture id byre */
> +#define REG_PIDH	0x0A	/* Product ID MSB */
> +#define REG_PIDL	0x0B	/* Product ID LSB */
> +
> +#define REG_84		0x84	/* lots of stuff */
> +#define REG_REG38	0x38	/* sub-addr */
> +
> +#define REG_AHSTART	0x17	/* Horiz start high bits */
> +#define REG_AHSIZE	0x18
> +#define REG_AVSTART	0x19	/* Vert start high bits */
> +#define REG_AVSIZE	0x1A
> +#define REG_PSHFT	0x1b	/* Pixel delay after HREF */
> +
> +#define REG_HOUTSIZE	0x31
> +#define REG_VOUTSIZE	0x32
> +#define REG_HVSIZEOFF	0x33
> +#define REG_REG34	0x34	/* DSP output size H/V LSB*/
> +
> +#define REG_ISP_CTRL00	0x80
> +#define ISPCTRL00_AWB_EN	0x10
> +#define ISPCTRL00_AWB_GAIN_EN	0x04
> +
> +#define	REG_YGAIN	0xE2	/* ygain for contrast control */
> +
> +#define	REG_YBRIGHT	  0xE3
> +#define	REG_SGNSET	  0xE4
> +#define	SGNSET_YBRIGHT_MASK	  0x08
> +
> +#define REG_USAT	0xDD
> +#define REG_VSAT	0xDE
> +
> +
> +struct ov7740 {
> +	struct v4l2_subdev subdev;
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> +	struct media_pad pad;
> +#endif
> +	struct v4l2_mbus_framefmt format;
> +	const struct ov7740_pixfmt *fmt;  /* Current format */
> +	const struct ov7740_framesize *frmsize;
> +	struct regmap *regmap;
> +	struct clk *xvclk;
> +	struct v4l2_ctrl_handler ctrl_handler;
> +	struct {
> +		/* gain cluster */
> +		struct v4l2_ctrl *auto_gain;
> +		struct v4l2_ctrl *gain;
> +	};
> +	struct {
> +		struct v4l2_ctrl *auto_wb;
> +		struct v4l2_ctrl *blue_balance;
> +		struct v4l2_ctrl *red_balance;
> +	};
> +	struct {
> +		struct v4l2_ctrl *hflip;
> +		struct v4l2_ctrl *vflip;
> +	};
> +	struct {
> +		/* exposure cluster */
> +		struct v4l2_ctrl *auto_exposure;
> +		struct v4l2_ctrl *exposure;
> +	};
> +	struct {
> +		/* saturation/hue cluster */
> +		struct v4l2_ctrl *saturation;
> +		struct v4l2_ctrl *hue;
> +	};
> +	struct v4l2_ctrl *brightness;
> +	struct v4l2_ctrl *contrast;
> +
> +	struct mutex mutex;	/* To serialize asynchronus callbacks */
> +	bool streaming;		/* Streaming on/off */
> +
> +	struct gpio_desc *resetb_gpio;
> +	struct gpio_desc *pwdn_gpio;
> +};
> +
> +struct ov7740_pixfmt {
> +	u32 mbus_code;
> +	enum v4l2_colorspace colorspace;
> +	const struct reg_sequence *regs;
> +	u32 reg_num;
> +};
> +
> +struct ov7740_framesize {
> +	u16 width;
> +	u16 height;
> +	const struct reg_sequence *regs;
> +	u32 reg_num;
> +};
> +
> +static const struct reg_sequence ov7740_vga[] = {
> +	{0x55, 0x40},
> +	{0x11, 0x02},
> +
> +	{0xd5, 0x10},
> +	{0x0c, 0x12},
> +	{0x0d, 0x34},
> +	{0x17, 0x25},
> +	{0x18, 0xa0},
> +	{0x19, 0x03},
> +	{0x1a, 0xf0},
> +	{0x1b, 0x89},
> +	{0x22, 0x03},
> +	{0x29, 0x18},
> +	{0x2b, 0xf8},
> +	{0x2c, 0x01},
> +	{REG_HOUTSIZE, 0xa0},
> +	{REG_VOUTSIZE, 0xf0},
> +	{0x33, 0xc4},
> +	{REG_OUTSIZE_LSB, 0x0},
> +	{0x35, 0x05},
> +	{0x04, 0x60},
> +	{0x27, 0x80},
> +	{0x3d, 0x0f},
> +	{0x3e, 0x80},
> +	{0x3f, 0x40},
> +	{0x40, 0x7f},
> +	{0x41, 0x6a},
> +	{0x42, 0x29},
> +	{0x44, 0x22},
> +	{0x45, 0x41},
> +	{0x47, 0x02},
> +	{0x49, 0x64},
> +	{0x4a, 0xa1},
> +	{0x4b, 0x40},
> +	{0x4c, 0x1a},
> +	{0x4d, 0x50},
> +	{0x4e, 0x13},
> +	{0x64, 0x00},
> +	{0x67, 0x88},
> +	{0x68, 0x1a},
> +
> +	{0x14, 0x28},
> +	{0x24, 0x3c},
> +	{0x25, 0x30},
> +	{0x26, 0x72},
> +	{0x50, 0x97},
> +	{0x51, 0x1f},
> +	{0x52, 0x00},
> +	{0x53, 0x00},
> +	{0x20, 0x00},
> +	{0x21, 0xcf},
> +	{0x50, 0x4b},
> +	{0x38, 0x14},
> +	{0xe9, 0x00},
> +	{0x56, 0x55},
> +	{0x57, 0xff},
> +	{0x58, 0xff},
> +	{0x59, 0xff},
> +	{0x5f, 0x04},
> +	{0xec, 0x00},
> +	{0x13, 0xff},
> +
> +	{0x81, 0x3f},
> +	{0x82, 0x32},
> +	{0x38, 0x11},
> +	{0x84, 0x70},
> +	{0x85, 0x00},
> +	{0x86, 0x03},
> +	{0x87, 0x01},
> +	{0x88, 0x05},
> +	{0x89, 0x30},
> +	{0x8d, 0x30},
> +	{0x8f, 0x85},
> +	{0x93, 0x30},
> +	{0x95, 0x85},
> +	{0x99, 0x30},
> +	{0x9b, 0x85},
> +
> +	{0x9c, 0x08},
> +	{0x9d, 0x12},
> +	{0x9e, 0x23},
> +	{0x9f, 0x45},
> +	{0xa0, 0x55},
> +	{0xa1, 0x64},
> +	{0xa2, 0x72},
> +	{0xa3, 0x7f},
> +	{0xa4, 0x8b},
> +	{0xa5, 0x95},
> +	{0xa6, 0xa7},
> +	{0xa7, 0xb5},
> +	{0xa8, 0xcb},
> +	{0xa9, 0xdd},
> +	{0xaa, 0xec},
> +	{0xab, 0x1a},
> +
> +	{0xce, 0x78},
> +	{0xcf, 0x6e},
> +	{0xd0, 0x0a},
> +	{0xd1, 0x0c},
> +	{0xd2, 0x84},
> +	{0xd3, 0x90},
> +	{0xd4, 0x1e},
> +
> +	{0x5a, 0x24},
> +	{0x5b, 0x1f},
> +	{0x5c, 0x88},
> +	{0x5d, 0x60},
> +
> +	{0xac, 0x6e},
> +	{0xbe, 0xff},
> +	{0xbf, 0x00},
> +
> +	{0x0f, 0x1d},
> +	{0x0f, 0x1f},
> +};
> +
> +static const struct ov7740_framesize ov7740_framesizes[] = {
> +	{
> +		.width		= VGA_WIDTH,
> +		.height		= VGA_HEIGHT,
> +		.regs		= ov7740_vga,
> +		.reg_num	= ARRAY_SIZE(ov7740_vga),
> +	},
> +};
> +
> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> +static int ov7740_get_register(struct v4l2_subdev *sd,
> +			       struct v4l2_dbg_register *reg)
> +{
> +	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
> +	struct regmap *regmap = ov7740->regmap;
> +	unsigned int val = 0;
> +	int ret;
> +
> +	ret = regmap_read(regmap, reg->reg & 0xff, &val);
> +	reg->val = val;
> +	reg->size = 1;
> +
> +	return 0;
> +}
> +
> +static int ov7740_set_register(struct v4l2_subdev *sd,
> +			       const struct v4l2_dbg_register *reg)
> +{
> +	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
> +	struct regmap *regmap = ov7740->regmap;
> +
> +	regmap_write(regmap, reg->reg & 0xff, reg->val & 0xff);
> +
> +	return 0;
> +}
> +#endif
> +
> +static int ov7740_set_power(struct ov7740 *ov7740, int on)
> +{
> +	int ret;
> +
> +	if (on) {
> +		ret = clk_prepare_enable(ov7740->xvclk);
> +		if (ret)
> +			return ret;
> +
> +		if (ov7740->pwdn_gpio)
> +			gpiod_direction_output(ov7740->pwdn_gpio, 0);
> +
> +		if (ov7740->resetb_gpio) {
> +			gpiod_set_value(ov7740->resetb_gpio, 1);
> +			usleep_range(500, 1000);
> +			gpiod_set_value(ov7740->resetb_gpio, 0);
> +			usleep_range(3000, 5000);
> +		}
> +	} else {
> +		clk_disable_unprepare(ov7740->xvclk);
> +
> +		if (ov7740->pwdn_gpio)
> +			gpiod_direction_output(ov7740->pwdn_gpio, 0);
> +	}
> +
> +	return 0;
> +}
> +
> +static struct v4l2_subdev_core_ops ov7740_subdev_core_ops = {
> +	.log_status = v4l2_ctrl_subdev_log_status,
> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> +	.g_register = ov7740_get_register,
> +	.s_register = ov7740_set_register,
> +#endif
> +	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
> +	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
> +};
> +
> +static int ov7740_set_white_balance(struct ov7740 *ov7740, int awb)
> +{
> +	struct regmap *regmap = ov7740->regmap;
> +	unsigned int value;
> +	int ret;
> +
> +	ret = regmap_read(regmap, REG_ISP_CTRL00, &value);
> +	if (!ret) {
> +		if (awb)
> +			value |= (ISPCTRL00_AWB_EN | ISPCTRL00_AWB_GAIN_EN);
> +		else
> +			value &= ~(ISPCTRL00_AWB_EN | ISPCTRL00_AWB_GAIN_EN);
> +		ret = regmap_write(regmap, REG_ISP_CTRL00, value);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	if (!awb) {
> +		ret = regmap_write(regmap, REG_BGAIN,
> +				   ov7740->blue_balance->val);
> +		if (ret)
> +			return ret;
> +
> +		ret = regmap_write(regmap, REG_RGAIN, ov7740->red_balance->val);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int ov7740_set_saturation(struct regmap *regmap, int value)
> +{
> +	int ret;
> +
> +	ret = regmap_write(regmap, REG_USAT, (unsigned char)value);
> +	if (ret)
> +		return ret;
> +
> +	return regmap_write(regmap, REG_VSAT, (unsigned char)value);
> +}
> +
> +static int ov7740_set_gain(struct regmap *regmap, int value)
> +{
> +	int ret;
> +
> +	ret = regmap_write(regmap, REG_GAIN, value & 0xff);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_update_bits(regmap, REG_CTRL15,
> +				 REG15_GAIN_MSB, (value >> 8) & 0x3);
> +	if (!ret)
> +		ret = regmap_update_bits(regmap, REG_REG13, REG13_AGC_EN, 0);
> +
> +	return ret;
> +}
> +
> +static int ov7740_set_autogain(struct regmap *regmap, int value)
> +{
> +	unsigned int reg;
> +	int ret;
> +
> +	ret = regmap_read(regmap, REG_REG13, &reg);
> +	if (ret)
> +		return ret;
> +	if (value)
> +		reg |= REG13_AGC_EN;
> +	else
> +		reg &= ~REG13_AGC_EN;
> +	return regmap_write(regmap, REG_REG13, reg);
> +}
> +
> +static int ov7740_set_brightness(struct regmap *regmap, int value)
> +{
> +	/* Turn off AEC/AGC */
> +	regmap_update_bits(regmap, REG_REG13, REG13_AEC_EN, 0);
> +	regmap_update_bits(regmap, REG_REG13, REG13_AGC_EN, 0);
> +
> +	if (value >= 0) {
> +		regmap_write(regmap, REG_YBRIGHT, (unsigned char)value);
> +		regmap_update_bits(regmap, REG_SGNSET, SGNSET_YBRIGHT_MASK, 0);
> +	} else{
> +		regmap_write(regmap, REG_YBRIGHT, (unsigned char)(-value));
> +		regmap_update_bits(regmap, REG_SGNSET, SGNSET_YBRIGHT_MASK, 1);
> +	}
> +
> +	return 0;
> +}
> +
> +static int ov7740_set_contrast(struct regmap *regmap, int value)
> +{
> +	return regmap_write(regmap, REG_YGAIN, (unsigned char)value);
> +}
> +
> +static int ov7740_get_gain(struct ov7740 *ov7740, struct v4l2_ctrl *ctrl)
> +{
> +	struct regmap *regmap = ov7740->regmap;
> +	unsigned int value0, value1;
> +	int ret;
> +
> +	if (!ctrl->val)
> +		return 0;
> +
> +	ret = regmap_read(regmap, REG_GAIN, &value0);
> +	if (ret)
> +		return ret;
> +	ret = regmap_read(regmap, REG_CTRL15, &value1);
> +	if (ret)
> +		return ret;
> +
> +	ov7740->gain->val = (value1 << 8) | (value0 & 0xff);
> +
> +	return 0;
> +}
> +
> +static int ov7740_set_exp(struct regmap *regmap, int value)
> +{
> +	int ret;
> +
> +	/* Turn off AEC/AGC */
> +	ret = regmap_update_bits(regmap, REG_REG13,
> +				 REG13_AEC_EN | REG13_AGC_EN, 0);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_write(regmap, REG_AEC, (unsigned char)value);
> +	if (ret)
> +		return ret;
> +
> +	return regmap_write(regmap, REG_HAEC, (unsigned char)(value >> 8));
> +}
> +
> +static int ov7740_set_autoexp(struct regmap *regmap,
> +			      enum v4l2_exposure_auto_type value)
> +{
> +	unsigned int reg;
> +	int ret;
> +
> +	ret = regmap_read(regmap, REG_REG13, &reg);
> +	if (!ret) {
> +		if (value == V4L2_EXPOSURE_AUTO)
> +			reg |= (REG13_AEC_EN | REG13_AGC_EN);
> +		else
> +			reg &= ~(REG13_AEC_EN | REG13_AGC_EN);
> +		ret = regmap_write(regmap, REG_REG13, reg);
> +	}
> +
> +	return ret;
> +}
> +
> +
> +static int ov7740_get_volatile_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct ov7740 *ov7740 = container_of(ctrl->handler,
> +					     struct ov7740, ctrl_handler);
> +	int ret;
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_AUTOGAIN:
> +		ret = ov7740_get_gain(ov7740, ctrl);
> +		break;
> +	default:
> +		ret = -EINVAL;
> +		break;
> +	}
> +	return ret;
> +}
> +
> +static int ov7740_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct ov7740 *ov7740 = container_of(ctrl->handler,
> +					     struct ov7740, ctrl_handler);
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov7740->subdev);
> +	struct regmap *regmap = ov7740->regmap;
> +	int ret;
> +	u8 val = 0;
> +
> +	if (pm_runtime_get_if_in_use(&client->dev) <= 0)
> +		return 0;
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_AUTO_WHITE_BALANCE:
> +		ret = ov7740_set_white_balance(ov7740, ctrl->val);
> +		break;
> +	case V4L2_CID_SATURATION:
> +		ret = ov7740_set_saturation(regmap, ctrl->val);
> +		break;
> +	case V4L2_CID_BRIGHTNESS:
> +		ret = ov7740_set_brightness(regmap, ctrl->val);
> +		break;
> +	case V4L2_CID_CONTRAST:
> +		ret = ov7740_set_contrast(regmap, ctrl->val);
> +		break;
> +	case V4L2_CID_VFLIP:
> +		ret = regmap_update_bits(regmap, REG_REG0C,
> +					 REG0C_IMG_FLIP, val);
> +		break;
> +	case V4L2_CID_HFLIP:
> +		val = ctrl->val ? REG0C_IMG_MIRROR : 0x00;
> +		ret = regmap_update_bits(regmap, REG_REG0C,
> +					 REG0C_IMG_MIRROR, val);
> +		break;
> +	case V4L2_CID_AUTOGAIN:
> +		if (!ctrl->val)
> +			return ov7740_set_gain(regmap, ov7740->gain->val);
> +
> +		ret = ov7740_set_autogain(regmap, ctrl->val);
> +		break;
> +
> +	case V4L2_CID_EXPOSURE_AUTO:
> +		if (ctrl->val == V4L2_EXPOSURE_MANUAL)
> +			return ov7740_set_exp(regmap, ov7740->exposure->val);
> +
> +		ret = ov7740_set_autoexp(regmap, ctrl->val);
> +		break;
> +	default:
> +		ret = -EINVAL;
> +		break;
> +	}
> +
> +	pm_runtime_put(&client->dev);
> +
> +	return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops ov7740_ctrl_ops = {
> +	.g_volatile_ctrl = ov7740_get_volatile_ctrl,
> +	.s_ctrl = ov7740_set_ctrl,
> +};
> +
> +static int ov7740_start_streaming(struct ov7740 *ov7740)
> +{
> +	return __v4l2_ctrl_handler_setup(ov7740->subdev.ctrl_handler);
> +}
> +
> +static int ov7740_set_stream(struct v4l2_subdev *sd, int enable)
> +{
> +	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
> +	struct i2c_client *client = v4l2_get_subdevdata(sd);
> +	int ret = 0;
> +
> +	mutex_lock(&ov7740->mutex);
> +	if (ov7740->streaming == enable) {
> +		mutex_unlock(&ov7740->mutex);
> +		return 0;
> +	}
> +
> +	if (enable) {
> +		ret = pm_runtime_get_sync(&client->dev);
> +		if (ret < 0) {
> +			pm_runtime_put_noidle(&client->dev);
> +			goto err_unlock;
> +		}
> +
> +		ret = ov7740_start_streaming(ov7740);
> +		if (ret)
> +			goto err_rpm_put;
> +	} else {
> +		pm_runtime_put(&client->dev);
> +	}
> +
> +	ov7740->streaming = enable;
> +
> +	mutex_unlock(&ov7740->mutex);
> +	return ret;
> +
> +err_rpm_put:
> +	pm_runtime_put(&client->dev);
> +err_unlock:
> +	mutex_unlock(&ov7740->mutex);
> +	return ret;
> +}
> +
> +static int ov7740_get_parm(struct v4l2_subdev *sd,
> +			   struct v4l2_streamparm *parms)
> +{
> +	struct v4l2_captureparm *cp = &parms->parm.capture;
> +	struct v4l2_fract *tpf = &cp->timeperframe;
> +
> +	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> +		return -EINVAL;
> +
> +	memset(cp, 0, sizeof(struct v4l2_captureparm));
> +	cp->capability = V4L2_CAP_TIMEPERFRAME;
> +
> +	tpf->numerator = 1;
> +	tpf->denominator = 60;
> +
> +	return 0;
> +}
> +
> +static int ov7740_set_parm(struct v4l2_subdev *sd,
> +			   struct v4l2_streamparm *parms)
> +{
> +	struct v4l2_captureparm *cp = &parms->parm.capture;
> +	struct v4l2_fract *tpf = &cp->timeperframe;
> +
> +	if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> +		return -EINVAL;
> +	if (cp->extendedmode != 0)
> +		return -EINVAL;
> +
> +	cp->capability = V4L2_CAP_TIMEPERFRAME;
> +
> +	tpf->numerator = 1;
> +	tpf->denominator = 60;
> +
> +	return 0;
> +}
> +
> +static struct v4l2_subdev_video_ops ov7740_subdev_video_ops = {
> +	.s_stream = ov7740_set_stream,
> +	.s_parm = ov7740_set_parm,
> +	.g_parm = ov7740_get_parm,
> +};
> +
> +static const struct reg_sequence ov7740_format_yuyv[] = {
> +	{0x12, 0x00},
> +	{0x36, 0x3f},
> +	{0x80, 0x7f},
> +	{0x83, 0x01},
> +};
> +
> +static const struct reg_sequence ov7740_format_bggr8[] = {
> +	{0x36, 0x2f},
> +	{0x80, 0x01},
> +	{0x83, 0x04},
> +};
> +
> +static const struct ov7740_pixfmt ov7740_formats[] = {
> +	{
> +		.mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
> +		.colorspace = V4L2_COLORSPACE_SRGB,
> +		.regs = ov7740_format_yuyv,
> +		.reg_num = ARRAY_SIZE(ov7740_format_yuyv),
> +	},
> +	{
> +		.mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
> +		.colorspace = V4L2_COLORSPACE_SRGB,
> +		.regs = ov7740_format_bggr8,
> +		.reg_num = ARRAY_SIZE(ov7740_format_bggr8),
> +	}
> +};
> +#define N_OV7740_FMTS ARRAY_SIZE(ov7740_formats)
> +
> +static int ov7740_enum_mbus_code(struct v4l2_subdev *sd,
> +				 struct v4l2_subdev_pad_config *cfg,
> +				 struct v4l2_subdev_mbus_code_enum *code)
> +{
> +	if (code->pad || code->index >= N_OV7740_FMTS)
> +		return -EINVAL;
> +
> +	code->code = ov7740_formats[code->index].mbus_code;
> +
> +	return 0;
> +}
> +
> +static int ov7740_enum_frame_interval(struct v4l2_subdev *sd,
> +				struct v4l2_subdev_pad_config *cfg,
> +				struct v4l2_subdev_frame_interval_enum *fie)
> +{
> +	if (fie->pad)
> +		return -EINVAL;
> +
> +	if (fie->index >= 1)
> +		return -EINVAL;
> +
> +	if ((fie->width != VGA_WIDTH) || (fie->height != VGA_HEIGHT))
> +		return -EINVAL;
> +
> +	fie->interval.numerator = 1;
> +	fie->interval.denominator = 60;
> +
> +	return 0;
> +}
> +
> +static int ov7740_enum_frame_size(struct v4l2_subdev *sd,
> +				  struct v4l2_subdev_pad_config *cfg,
> +				  struct v4l2_subdev_frame_size_enum *fse)
> +{
> +	if (fse->pad)
> +		return -EINVAL;
> +
> +	if (fse->index > 0)
> +		return -EINVAL;
> +
> +	fse->min_width = fse->max_width = VGA_WIDTH;
> +	fse->min_height = fse->max_height = VGA_HEIGHT;
> +
> +	return 0;
> +}
> +
> +static int ov7740_try_fmt_internal(struct v4l2_subdev *sd,
> +				   struct v4l2_mbus_framefmt *fmt,
> +				   const struct ov7740_pixfmt **ret_fmt,
> +				   const struct ov7740_framesize **ret_frmsize)
> +{
> +	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
> +	const struct ov7740_framesize *fsize = &ov7740_framesizes[0];
> +	int index, i;
> +
> +	for (index = 0; index < N_OV7740_FMTS; index++) {
> +		if (ov7740_formats[index].mbus_code == fmt->code)
> +			break;
> +	}
> +	if (index >= N_OV7740_FMTS) {
> +		/* default to first format */
> +		index = 0;
> +		fmt->code = ov7740_formats[0].mbus_code;
> +	}
> +	if (ret_fmt != NULL)
> +		*ret_fmt = ov7740_formats + index;
> +
> +	for (i = 0; i < ARRAY_SIZE(ov7740_framesizes); i++) {
> +		if ((fsize->width >= fmt->width) &&
> +		    (fsize->height >= fmt->height)) {
> +			fmt->width = fsize->width;
> +			fmt->height = fsize->height;
> +			break;
> +		}
> +
> +		fsize++;
> +	}
> +
> +	if (ret_frmsize != NULL)
> +		*ret_frmsize = fsize;
> +
> +	fmt->field = V4L2_FIELD_NONE;
> +	fmt->colorspace = ov7740_formats[index].colorspace;
> +
> +	ov7740->format = *fmt;
> +
> +	return 0;
> +}
> +
> +static int ov7740_set_fmt(struct v4l2_subdev *sd,
> +			  struct v4l2_subdev_pad_config *cfg,
> +			  struct v4l2_subdev_format *format)
> +{
> +	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
> +	const struct ov7740_pixfmt *ovfmt;
> +	const struct ov7740_framesize *fsize;
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> +	struct v4l2_mbus_framefmt *mbus_fmt;
> +#endif
> +	int ret;
> +
> +	mutex_lock(&ov7740->mutex);
> +	if (format->pad) {
> +		ret = -EINVAL;
> +		goto error;
> +	}
> +
> +	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
> +		ret = ov7740_try_fmt_internal(sd, &format->format, NULL, NULL);
> +		if (ret)
> +			goto error;
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> +		mbus_fmt = v4l2_subdev_get_try_format(sd, cfg, format->pad);
> +		*mbus_fmt = format->format;
> +
> +		mutex_unlock(&ov7740->mutex);
> +		return 0;
> +#else
> +		ret = -ENOTTY;
> +		goto error;
> +#endif
> +	}
> +
> +	ret = ov7740_try_fmt_internal(sd, &format->format, &ovfmt, &fsize);
> +	if (ret)
> +		goto error;
> +
> +	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
> +		regmap_multi_reg_write(ov7740->regmap,
> +				       ovfmt->regs, ovfmt->reg_num);
> +
> +		regmap_multi_reg_write(ov7740->regmap,
> +				       fsize->regs, fsize->reg_num);
> +	}
> +
> +	ov7740->fmt = ovfmt;
> +
> +	mutex_unlock(&ov7740->mutex);
> +	return 0;
> +
> +error:
> +	mutex_unlock(&ov7740->mutex);
> +	return ret;
> +}
> +
> +static int ov7740_get_fmt(struct v4l2_subdev *sd,
> +			  struct v4l2_subdev_pad_config *cfg,
> +			  struct v4l2_subdev_format *format)
> +{
> +	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> +	struct v4l2_mbus_framefmt *mbus_fmt;
> +#endif
> +	int ret = 0;
> +
> +	mutex_lock(&ov7740->mutex);
> +	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> +		mbus_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
> +		format->format = *mbus_fmt;
> +		ret = 0;
> +#else
> +		ret = -ENOTTY;
> +#endif
> +	} else {
> +		format->format = ov7740->format;
> +	}
> +	mutex_unlock(&ov7740->mutex);
> +
> +	return ret;
> +}
> +
> +static const struct v4l2_subdev_pad_ops ov7740_subdev_pad_ops = {
> +	.enum_frame_interval = ov7740_enum_frame_interval,
> +	.enum_frame_size = ov7740_enum_frame_size,
> +	.enum_mbus_code = ov7740_enum_mbus_code,
> +	.get_fmt = ov7740_get_fmt,
> +	.set_fmt = ov7740_set_fmt,
> +};
> +
> +static const struct v4l2_subdev_ops ov7740_subdev_ops = {
> +	.core	= &ov7740_subdev_core_ops,
> +	.video	= &ov7740_subdev_video_ops,
> +	.pad	= &ov7740_subdev_pad_ops,
> +};
> +
> +static void ov7740_get_default_format(struct v4l2_subdev *sd,
> +				      struct v4l2_mbus_framefmt *format)
> +{
> +	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
> +
> +	format->width = ov7740->frmsize->width;
> +	format->height = ov7740->frmsize->height;
> +	format->colorspace = ov7740->fmt->colorspace;
> +	format->code = ov7740->fmt->mbus_code;
> +	format->field = V4L2_FIELD_NONE;
> +}
> +
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> +static int ov7740_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +{
> +	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
> +	struct v4l2_mbus_framefmt *format =
> +				v4l2_subdev_get_try_format(sd, fh->pad, 0);
> +
> +	mutex_lock(&ov7740->mutex);
> +	ov7740_get_default_format(sd, format);
> +	mutex_unlock(&ov7740->mutex);
> +
> +	return 0;
> +}
> +
> +static const struct v4l2_subdev_internal_ops ov7740_subdev_internal_ops = {
> +	.open = ov7740_open,
> +};
> +#endif
> +
> +static void ov7740_init_default_format(struct ov7740 *ov7740)
> +{
> +	ov7740->frmsize = &ov7740_framesizes[0];
> +	ov7740->fmt = &ov7740_formats[0];
> +
> +	regmap_multi_reg_write(ov7740->regmap,
> +			       ov7740->fmt->regs, ov7740->fmt->reg_num);
> +
> +	regmap_multi_reg_write(ov7740->regmap,
> +			       ov7740->frmsize->regs, ov7740->frmsize->reg_num);
> +}
> +
> +static int ov7740_probe_dt(struct i2c_client *client,
> +			   struct ov7740 *ov7740)
> +{
> +	ov7740->resetb_gpio = devm_gpiod_get_optional(&client->dev, "reset",
> +			GPIOD_OUT_HIGH);
> +	if (IS_ERR(ov7740->resetb_gpio)) {
> +		dev_info(&client->dev, "can't get %s GPIO\n", "reset");
> +		return PTR_ERR(ov7740->resetb_gpio);
> +	}
> +
> +	ov7740->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown",
> +			GPIOD_OUT_LOW);
> +	if (IS_ERR(ov7740->pwdn_gpio)) {
> +		dev_info(&client->dev, "can't get %s GPIO\n", "powerdown");
> +		return PTR_ERR(ov7740->pwdn_gpio);
> +	}
> +
> +	return 0;
> +}
> +
> +static int ov7740_detect(struct ov7740 *ov7740)
> +{
> +	struct regmap *regmap = ov7740->regmap;
> +	unsigned int midh, midl, pidh, pidl;
> +	int ret;
> +
> +	ret = regmap_read(regmap, REG_MIDH, &midh);
> +	if (ret)
> +		return ret;
> +	if (midh != 0x7f)
> +		return -ENODEV;
> +
> +	ret = regmap_read(regmap, REG_MIDL, &midl);
> +	if (ret)
> +		return ret;
> +	if (midl != 0xa2)
> +		return -ENODEV;
> +
> +	ret = regmap_read(regmap, REG_PIDH, &pidh);
> +	if (ret)
> +		return ret;
> +	if (pidh != 0x77)
> +		return -ENODEV;
> +
> +	ret = regmap_read(regmap, REG_PIDL, &pidl);
> +	if (ret)
> +		return ret;
> +	if ((pidl != 0x40) && (pidl != 0x41) && (pidl != 0x42))
> +		return -ENODEV;
> +
> +	return 0;
> +}
> +
> +static int ov7740_init_controls(struct ov7740 *ov7740)
> +{
> +	struct i2c_client *client = v4l2_get_subdevdata(&ov7740->subdev);
> +	struct v4l2_ctrl_handler *ctrl_hdlr = &ov7740->ctrl_handler;
> +	int ret;
> +
> +	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 2);
> +	if (ret < 0)
> +		return ret;
> +
> +	ctrl_hdlr->lock = &ov7740->mutex;
> +	ov7740->auto_wb = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
> +					  V4L2_CID_AUTO_WHITE_BALANCE,
> +					  0, 1, 1, 1);
> +	ov7740->blue_balance = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
> +					       V4L2_CID_BLUE_BALANCE,
> +					       0, 0xff, 1, 0x80);
> +	ov7740->red_balance = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
> +					      V4L2_CID_RED_BALANCE,
> +					      0, 0xff, 1, 0x80);
> +
> +	ov7740->brightness = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
> +					     V4L2_CID_BRIGHTNESS,
> +					     -255, 255, 1, 0);
> +	ov7740->contrast = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
> +					   V4L2_CID_CONTRAST,
> +					   0, 127, 1, 0x20);
> +	ov7740->saturation = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
> +			  V4L2_CID_SATURATION, 0, 256, 1, 0x80);
> +	ov7740->hflip = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
> +					V4L2_CID_HFLIP, 0, 1, 1, 0);
> +	ov7740->vflip = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
> +					V4L2_CID_VFLIP, 0, 1, 1, 0);
> +	ov7740->gain = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
> +				       V4L2_CID_GAIN, 0, 1023, 1, 500);
> +	ov7740->auto_gain = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
> +					    V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
> +	ov7740->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &ov7740_ctrl_ops,
> +					   V4L2_CID_EXPOSURE, 0, 65535, 1, 500);
> +	ov7740->auto_exposure = v4l2_ctrl_new_std_menu(ctrl_hdlr,
> +					&ov7740_ctrl_ops,
> +					V4L2_CID_EXPOSURE_AUTO,
> +					V4L2_EXPOSURE_MANUAL, 0,
> +					V4L2_EXPOSURE_AUTO);
> +
> +	ov7740->gain->flags |= V4L2_CTRL_FLAG_VOLATILE;
> +	ov7740->exposure->flags |= V4L2_CTRL_FLAG_VOLATILE;
> +
> +	v4l2_ctrl_auto_cluster(3, &ov7740->auto_wb, 0, false);
> +	v4l2_ctrl_auto_cluster(2, &ov7740->auto_gain, 0, true);
> +	v4l2_ctrl_auto_cluster(2, &ov7740->auto_exposure,
> +			       V4L2_EXPOSURE_MANUAL, false);
> +	v4l2_ctrl_cluster(2, &ov7740->hflip);
> +
> +	ret = v4l2_ctrl_handler_setup(ctrl_hdlr);
> +	if (ret) {
> +		dev_err(&client->dev, "%s control init failed (%d)\n",
> +			__func__, ret);
> +		goto error;
> +	}
> +
> +	ov7740->subdev.ctrl_handler = ctrl_hdlr;
> +	return 0;
> +
> +error:
> +	v4l2_ctrl_handler_free(ctrl_hdlr);
> +	mutex_destroy(&ov7740->mutex);
> +	return ret;
> +}
> +
> +static void ov7740_free_controls(struct ov7740 *ov7740)
> +{
> +	v4l2_ctrl_handler_free(ov7740->subdev.ctrl_handler);
> +	mutex_destroy(&ov7740->mutex);
> +}
> +
> +#define OV7740_MAX_REGISTER     0xff
> +static const struct regmap_config ov7740_regmap_config = {
> +	.reg_bits	= 8,
> +	.val_bits	= 8,
> +	.max_register	= OV7740_MAX_REGISTER,
> +};
> +
> +static int ov7740_probe(struct i2c_client *client,
> +			const struct i2c_device_id *id)
> +{
> +	struct ov7740 *ov7740;
> +	struct v4l2_subdev *sd;
> +	int ret;
> +
> +	if (!i2c_check_functionality(client->adapter,
> +				     I2C_FUNC_SMBUS_BYTE_DATA)) {
> +		dev_err(&client->dev,
> +			"OV7740: I2C-Adapter doesn't support SMBUS\n");
> +		return -EIO;
> +	}
> +
> +	ov7740 = devm_kzalloc(&client->dev, sizeof(*ov7740), GFP_KERNEL);
> +	if (!ov7740)
> +		return -ENOMEM;
> +
> +	ov7740->xvclk = devm_clk_get(&client->dev, "xvclk");
> +	if (IS_ERR(ov7740->xvclk)) {
> +		ret = PTR_ERR(ov7740->xvclk);
> +		dev_err(&client->dev,
> +			"OV7740: fail to get xvclk: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = ov7740_probe_dt(client, ov7740);
> +	if (ret)
> +		return ret;
> +
> +	ov7740->regmap = devm_regmap_init_i2c(client, &ov7740_regmap_config);
> +	if (IS_ERR(ov7740->regmap)) {
> +		ret = PTR_ERR(ov7740->regmap);
> +		dev_err(&client->dev, "Failed to allocate register map: %d\n",
> +			ret);
> +		return ret;
> +	}
> +
> +	sd = &ov7740->subdev;
> +	client->flags |= I2C_CLIENT_SCCB;
> +	v4l2_i2c_subdev_init(sd, client, &ov7740_subdev_ops);
> +
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> +	sd->internal_ops = &ov7740_subdev_internal_ops;
> +	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +#endif
> +
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> +	ov7740->pad.flags = MEDIA_PAD_FL_SOURCE;
> +	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
> +	ret = media_entity_pads_init(&sd->entity, 1, &ov7740->pad);
> +	if (ret)
> +		return ret;
> +#endif
> +
> +	ret = ov7740_set_power(ov7740, 1);
> +	if (ret)
> +		return ret;
> +
> +	ret = ov7740_detect(ov7740);
> +	if (ret)
> +		goto error_detect;
> +
> +	mutex_init(&ov7740->mutex);
> +
> +	ret = ov7740_init_controls(ov7740);
> +	if (ret)
> +		goto error_init_controls;
> +
> +	v4l_info(client, "chip found @ 0x%02x (%s)\n",
> +			client->addr << 1, client->adapter->name);
> +
> +	ov7740_init_default_format(ov7740);

This doesn't yet address the issue. The sensor will be powered off just a
few lines below, so the device state will be lost. You need to ensure the
registers get programmed after the sensor is powered on and before
streaming is started.

> +
> +	ov7740_get_default_format(sd, &ov7740->format);
> +
> +	ret = v4l2_async_register_subdev(sd);
> +	if (ret)
> +		goto error_async_register;
> +
> +	pm_runtime_set_active(&client->dev);
> +	pm_runtime_enable(&client->dev);
> +	pm_runtime_idle(&client->dev);
> +
> +	return 0;
> +
> +error_async_register:
> +	v4l2_ctrl_handler_free(ov7740->subdev.ctrl_handler);
> +error_init_controls:
> +	ov7740_free_controls(ov7740);
> +error_detect:
> +	ov7740_set_power(ov7740, 0);
> +	media_entity_cleanup(&ov7740->subdev.entity);
> +
> +	return ret;
> +}
> +
> +static int ov7740_remove(struct i2c_client *client)
> +{
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
> +
> +	mutex_destroy(&ov7740->mutex);
> +	v4l2_ctrl_handler_free(ov7740->subdev.ctrl_handler);
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> +	media_entity_cleanup(&ov7740->subdev.entity);
> +#endif
> +	v4l2_async_unregister_subdev(sd);
> +	ov7740_free_controls(ov7740);
> +
> +	pm_runtime_get_sync(&client->dev);
> +	pm_runtime_disable(&client->dev);
> +	pm_runtime_set_suspended(&client->dev);
> +	pm_runtime_put_noidle(&client->dev);
> +
> +	ov7740_set_power(ov7740, 0);
> +	return 0;
> +}
> +
> +static int __maybe_unused ov7740_runtime_suspend(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
> +
> +	ov7740_set_power(ov7740, 0);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused ov7740_runtime_resume(struct device *dev)
> +{
> +	struct i2c_client *client = to_i2c_client(dev);
> +	struct v4l2_subdev *sd = i2c_get_clientdata(client);
> +	struct ov7740 *ov7740 = container_of(sd, struct ov7740, subdev);
> +
> +	return ov7740_set_power(ov7740, 1);
> +}
> +
> +static const struct i2c_device_id ov7740_id[] = {
> +	{ "ov7740", 0 },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(i2c, ov7740_id);
> +
> +static const struct dev_pm_ops ov7740_pm_ops = {
> +	SET_RUNTIME_PM_OPS(ov7740_runtime_suspend, ov7740_runtime_resume, NULL)
> +};
> +
> +static const struct of_device_id ov7740_of_match[] = {
> +	{.compatible = "ovti,ov7740", },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, ov7740_of_match);
> +
> +static struct i2c_driver ov7740_i2c_driver = {
> +	.driver = {
> +		.name = "ov7740",
> +		.pm = &ov7740_pm_ops,
> +		.of_match_table = of_match_ptr(ov7740_of_match),
> +	},
> +	.probe    = ov7740_probe,
> +	.remove   = ov7740_remove,
> +	.id_table = ov7740_id,
> +};
> +module_i2c_driver(ov7740_i2c_driver);
> +
> +MODULE_DESCRIPTION("The V4L2 driver for Omnivision 7740 sensor");
> +MODULE_AUTHOR("Songjun Wu <songjun.wu@...el.com>");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.15.0
> 

-- 
Sakari Ailus
e-mail: sakari.ailus@....fi

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