Message-ID: <e010a22235c3ca70f21e7ad62e1f641446138288.camel@mediatek.com>
Date: Tue, 9 Jan 2024 09:25:49 +0000
From: Zhi Mao (毛智) <zhi.mao@...iatek.com>
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Subject: Re: [PATCH 2/2] media: i2c: Add GC08A3 image sensor driver

On Thu, 2023-12-07 at 13:06 +0200, Laurent Pinchart wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  Hi Zhi Mao,
> 
> Thank you for the patch.
> 
> This is a partial review, as lots of things will change already for
> v2.
> I'll review the next version in more details.
> 
> First of all, please rebase the driver on top of the master branch of
> git://linuxtv.org/media_stage.git. Quite a few in-kernel APIs have
> changed.
> 
> On Thu, Nov 23, 2023 at 07:51:04PM +0800, Zhi Mao wrote:
> > Add a V4L2 sub-device driver for Galaxycore GC08A3 image sensor.
> > 
> > Signed-off-by: Zhi Mao <zhi.mao@...iatek.com>
> > ---
> >  drivers/media/i2c/Kconfig  |   14 +
> >  drivers/media/i2c/Makefile |    1 +
> >  drivers/media/i2c/gc08a3.c | 2046
> ++++++++++++++++++++++++++++++++++++
> >  3 files changed, 2061 insertions(+)
> >  create mode 100644 drivers/media/i2c/gc08a3.c
> > 
> > diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> > index 59ee0ca2c978..2e37be537690 100644
> > --- a/drivers/media/i2c/Kconfig
> > +++ b/drivers/media/i2c/Kconfig
> > @@ -1451,6 +1451,20 @@ config VIDEO_THS7303
> >    To compile this driver as a module, choose M here: the
> >    module will be called ths7303.
> >  
> > +config VIDEO_GC08A3
> 
> Alphabetical order please.
[mtk]: fixed in patch:v3
> 
> > +tristate "GalaxyCore gc08a3 sensor support"
> > +depends on GPIOLIB && I2C && VIDEO_DEV
> > +select V4L2_FWNODE
> > +select MEDIA_CONTROLLER
> > +select VIDEO_V4L2_SUBDEV_API
> 
> You can drop all of the above except
> 
> depends on GPIOLIB
> 
> The dependencies on I2C and VIDEO_DEV and the selection of
> V4L2_FWNODE,
> MEDIA_CONTROLLER and VIDEIO_V4L2_SUBDEV_API are now handled
> automatically for all drivers in the VIDEO_CAMERA_SENSOR menu.
[mtk]: fixed in patch:v3
> 
> > +select REGMAP_I2C
> > +help
> > +  This is a Video4Linux2 sensor driver for the GalaxyCore gc08a3
> > +  camera.
> > +
> > +  To compile this driver as a module, choose M here: the
> > +  module will be called gc08a3.
> > +
> >  endmenu
> >  
> >  #
> > diff --git a/drivers/media/i2c/Makefile
> b/drivers/media/i2c/Makefile
> > index f5010f80a21f..ec40dbd75e7a 100644
> > --- a/drivers/media/i2c/Makefile
> > +++ b/drivers/media/i2c/Makefile
> > @@ -36,6 +36,7 @@ obj-$(CONFIG_VIDEO_DW9719) += dw9719.o
> >  obj-$(CONFIG_VIDEO_DW9768) += dw9768.o
> >  obj-$(CONFIG_VIDEO_DW9807_VCM) += dw9807-vcm.o
> >  obj-$(CONFIG_VIDEO_ET8EK8) += et8ek8/
> > +obj-$(CONFIG_VIDEO_GC08A3) += gc08a3.o
> >  obj-$(CONFIG_VIDEO_HI556) += hi556.o
> >  obj-$(CONFIG_VIDEO_HI846) += hi846.o
> >  obj-$(CONFIG_VIDEO_HI847) += hi847.o
> > diff --git a/drivers/media/i2c/gc08a3.c
> b/drivers/media/i2c/gc08a3.c
> > new file mode 100644
> > index 000000000000..d3cf62b65c2e
> > --- /dev/null
> > +++ b/drivers/media/i2c/gc08a3.c
> > @@ -0,0 +1,2046 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * gc08a3.c - gc08a3 sensor driver
> > + *
> > + * Copyright 2023 Mediatek
> > + *
> > + * Zhi Mao <zhi.mao@...iatek.com>
> > + */
> > +
> > +#include <asm/unaligned.h>
> > +#include <linux/clk.h>
> > +#include <linux/delay.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/i2c.h>
> > +#include <linux/module.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/regmap.h>
> > +#include <linux/regulator/consumer.h>
> > +#include <media/media-entity.h>
> > +#include <media/v4l2-ctrls.h>
> > +#include <media/v4l2-fwnode.h>
> > +#include <media/v4l2-subdev.h>
> > +
> > +//=========================================
> 
> V4L2 uses C-style comments.
[mtk]: fixed in patch:v3
> 
> > +#define GC08A3_REG_VALUE_08BIT 1
> > +#define GC08A3_REG_VALUE_16BIT 2
> > +#define GC08A3_REG_VALUE_24BIT 3
> 
> Please use the v4l2-cci helpers for register access.
[mtk]: fixed in patch:v3
> 
> > +
> > +#define GC08A3_REG_CHIP_ID 0x03f0
> > +#define GC08A3_CHIP_ID 0x08a3
> > +
> > +#define GC08A3_NATIVE_WIDTH3264
> > +#define GC08A3_NATIVE_HEIGHT2448
> > +
> > +#define GC08A3_REG_TEST_PATTERN_EN 0x008c
> > +#define GC08A3_REG_TEST_PATTERN_IDX 0x008d
> > +#define GC08A3_TEST_PATTERN_EN 0x01
> > +
> > +#define GC08A3_STRAEMING_REG 0x0100
> > +
> > +#define GC08A3_SCLK 280000000LL
> > +
> > +#define GC08A3_DEFAULT_CLK_FREQ 24000000
> > +#define GC08A3_FPS 30
> > +#define GC08A3_MBUS_CODE MEDIA_BUS_FMT_SRGGB10_1X10
> > +#define GC08A3_DATA_LANES 4
> > +
> > +//for 1920*1080
> > +#define GC08A3_LINK_FREQ_207MHZ 207000000ULL
> > +//for 3264*2448
> > +#define GC08A3_LINK_FREQ_336MHZ 336000000ULL
> 
> Macros don't help readibility, simply use the numerical values in the
> link_freq_menu_items array below.
[mtk]: Using magic number may not improve code readability,
and I find some other sensor driver also use macros in
link_freq_menu_items. Can we keep this useage in gc08a driver? 
> 
> > +
> > +#define GC08A3_RGB_DEPTH 10
> > +
> > +//frame length
> > +#define GC08A3_FL_REG 0x0340
> > +#define GC08A3_VTS_30FPS 2548
> > +#define GC08A3_VTS_30FPS_MIN 2548
> > +#define GC08A3_VTS_60FPS 1276
> > +#define GC08A3_VTS_60FPS_MIN 1276
> > +#define GC08A3_VTS_MAX 0xfff0
> > +#define GC08A3_FL_MARGIN 48
> > +
> > +// line length
> > +#define GC08A3_LL_REG 0x0342
> > +#define GC08A3_HTS_30FPS 3640
> > +#define GC08A3_HTS_60FPS 3640
> > +
> > +#define GC08A3_EXP_REG 0x0202
> > +#define GC08A3_EXP_MARGIN 16
> > +#define GC08A3_EXP_MIN 4
> > +#define GC08A3_EXP_STEP 1
> > +
> > +#define GC08A3_FLIP_REG 0x0101
> > +#define GC08A3_FLIP_H_MASK 0x1
> > +#define GC08A3_FLIP_V_MASK 0x2
> > +
> > +#define GC08A3_AGAIN_REG 0x0204
> > +#define GC08A3_AGAIN_MIN 1024
> > +#define GC08A3_AGAIN_MAX (1024 * 16)
> > +#define GC08A3_AGAIN_STEP 1
> > +
> > +#define GC08A3_DGAIN_REG 0x020e
> > +#define GC08A3_DGAIN_MIN 1024
> > +#define GC08A3_DGAIN_MAX 1024
> > +#define GC08A3_DGAIN_STEP 1
> > +//============================================================
> > +
> > +//============================================================
> > +static const char *const gc08a3_test_pattern_menu[] = {
> > +"No Pattern",  "Solid Black", "Solid White",  "Solid Red",
> > +"Solid Green", "Solid Blue",  "Solid Yellow", "Colour Bar",
> > +};
> > +
> > +enum {
> > +GC08A3_LINK_FREQ_336MHZ_CFG,
> > +GC08A3_LINK_FREQ_207MHZ_CFG,
> > +};
> > +
> > +static const s64 link_freq_menu_items[] = {
> > +GC08A3_LINK_FREQ_336MHZ,
> > +GC08A3_LINK_FREQ_207MHZ,
> > +};
> > +
> > +static const char *const gc08a3_supply_name[] = {
> > +"avdd",
> > +"dvdd",
> > +"dovdd",
> > +};
> > +
> > +#define GC08A3_NUM_SUPPLIES ARRAY_SIZE(gc08a3_supply_name)
> > +
> > +struct gc08a3 {
> > +struct device *dev;
> > +struct v4l2_subdev sd;
> > +struct media_pad pad;
> > +struct v4l2_mbus_framefmt fmt;
> 
> Please use the subdev active state to store the active format. See
> commit e8a5b1df000e ("media: i2c: imx219: Use subdev active state")
> as
> an example of how to do so. There's also documentation in
> Documentation/driver-api/media/v4l2-subdev.rst (please read the most
> up-to-date version in the master branch of the media_stage tree).
> 
[mtk]: fixed in patch:v3

> > +struct i2c_client *client;
> > +
> > +struct v4l2_rect crop;
> 
> This should be stored in the subdev active state too.
> 
[mtk]: fixed in patch:v3

> > +
> > +struct clk *xclk;
> > +struct regulator_bulk_data supplies[GC08A3_NUM_SUPPLIES];
> > +struct gpio_desc *enable_gpio;
> > +
> > +struct regmap *regmap;
> > +
> > +struct v4l2_ctrl_handler ctrls;
> > +struct v4l2_ctrl *pixel_rate;
> > +struct v4l2_ctrl *link_freq;
> > +struct v4l2_ctrl *exposure;
> > +struct v4l2_ctrl *vblank;
> > +struct v4l2_ctrl *hblank;
> > +
> > +/*
> > + * Serialize control access, get/set format, get selection
> > + * and start streaming.
> > + */
> > +struct mutex mutex;
> 
> The mutex won't be needed anymore once you use the subdev active
> state.
> 
[mtk]: fixed in patch:v3

> > +
> > +bool streaming;
> > +
> > +/* Current mode */
> > +const struct gc08a3_mode *cur_mode;
> > +};
> > +
> > +struct reg_8 {
> > +u16 address;
> > +u8 val;
> > +};
> > +
> > +struct gc08a3_reg_list {
> > +u32 num_of_regs;
> > +const struct reg_8 *regs;
> > +};
> > +
> > +struct gc08a3_link_freq_config {
> > +const struct gc08a3_reg_list reg_list;
> > +};
> > +
> > +enum {
> > +GC08A3_TABLE_WAIT_MS = 0,
> > +GC08A3_TABLE_END,
> > +};
> > +
> > +/*From gc08a3_mode_tbls.h*/
> > +static const struct reg_8 mode_3264x2448[] = {
> > +/*system*/
> > +{ 0x031c, 0x60 },
> > +{ 0x0337, 0x04 },
> > +{ 0x0335, 0x51 },
> > +{ 0x0336, 0x70 },
> > +{ 0x0383, 0xbb },
> > +{ 0x031a, 0x00 },
> > +{ 0x0321, 0x10 },
> > +{ 0x0327, 0x03 },
> > +{ 0x0325, 0x40 },
> > +{ 0x0326, 0x23 },
> > +{ 0x0314, 0x11 },
> > +{ 0x0315, 0xd6 },
> > +{ 0x0316, 0x01 },
> > +{ 0x0334, 0x40 },
> > +{ 0x0324, 0x42 },
> > +{ 0x031c, 0x00 },
> > +{ 0x031c, 0x9f },
> > +{ 0x0344, 0x00 },
> > +{ 0x0345, 0x06 },
> > +{ 0x0346, 0x00 },
> > +{ 0x0347, 0x04 },
> > +{ 0x0348, 0x0c },
> > +{ 0x0349, 0xd0 }, //3280
> > +{ 0x034a, 0x09 },
> > +{ 0x034b, 0x9c }, //2460
> > +{ 0x0202, 0x09 },
> > +{ 0x0203, 0x04 }, //Exp
> > +{ 0x0340, 0x09 },
> > +{ 0x0341, 0xf4 }, //FL
> > +{ 0x0342, 0x07 },
> > +{ 0x0343, 0x1c }, //LineLength
> > +
> > +{ 0x0226, 0x00 }, //min vb[15:8]
> > +{ 0x0227, 0x28 }, //min vb[7:0]
> > +{ 0x0e38, 0x49 },
> > +{ 0x0210, 0x13 },
> > +{ 0x0218, 0x00 },
> > +{ 0x0241, 0x88 },
> > +{ 0x0392, 0x60 },
> > +
> > +/*ISP*/
> > +{ 0x031c, 0x80 },
> > +{ 0x03fe, 0x10 }, //CISCTL_rst
> > +{ 0x03fe, 0x00 },
> > +{ 0x031c, 0x9f },
> > +{ 0x03fe, 0x00 },
> > +{ 0x03fe, 0x00 },
> > +{ 0x03fe, 0x00 },
> > +{ 0x03fe, 0x00 },
> > +{ 0x031c, 0x80 },
> > +{ 0x03fe, 0x10 },
> > +{ 0x03fe, 0x00 },
> > +{ 0x031c, 0x9f },
> > +{ 0x00a2, 0x00 },
> > +{ 0x00a3, 0x00 },
> > +{ 0x00ab, 0x00 },
> > +{ 0x00ac, 0x00 },
> > +{ 0x05a0, 0x82 },
> > +{ 0x05ac, 0x00 },
> > +{ 0x05ad, 0x01 },
> > +{ 0x05ae, 0x00 },
> > +{ 0x0800, 0x0a },
> > +{ 0x0801, 0x14 },
> > +{ 0x0802, 0x28 },
> > +{ 0x0803, 0x34 },
> > +{ 0x0804, 0x0e },
> > +{ 0x0805, 0x33 },
> > +{ 0x0806, 0x03 },
> > +{ 0x0807, 0x8a },
> > +{ 0x0808, 0x50 },
> > +{ 0x0809, 0x00 },
> > +{ 0x080a, 0x34 },
> > +{ 0x080b, 0x03 },
> > +{ 0x080c, 0x26 },
> > +{ 0x080d, 0x03 },
> > +{ 0x080e, 0x18 },
> > +{ 0x080f, 0x03 },
> > +{ 0x0810, 0x10 },
> > +{ 0x0811, 0x03 },
> > +{ 0x0812, 0x00 },
> > +{ 0x0813, 0x00 },
> > +{ 0x0814, 0x01 },
> > +{ 0x0815, 0x00 },
> > +{ 0x0816, 0x01 },
> > +{ 0x0817, 0x00 },
> > +{ 0x0818, 0x00 },
> > +{ 0x0819, 0x0a },
> > +{ 0x081a, 0x01 },
> > +{ 0x081b, 0x6c },
> > +{ 0x081c, 0x00 },
> > +{ 0x081d, 0x0b },
> > +{ 0x081e, 0x02 },
> > +{ 0x081f, 0x00 },
> > +{ 0x0820, 0x00 },
> > +{ 0x0821, 0x0c },
> > +{ 0x0822, 0x02 },
> > +{ 0x0823, 0xd9 },
> > +{ 0x0824, 0x00 },
> > +{ 0x0825, 0x0d },
> > +{ 0x0826, 0x03 },
> > +{ 0x0827, 0xf0 },
> > +{ 0x0828, 0x00 },
> > +{ 0x0829, 0x0e },
> > +{ 0x082a, 0x05 },
> > +{ 0x082b, 0x94 },
> > +{ 0x082c, 0x09 },
> > +{ 0x082d, 0x6e },
> > +{ 0x082e, 0x07 },
> > +{ 0x082f, 0xe6 },
> > +{ 0x0830, 0x10 },
> > +{ 0x0831, 0x0e },
> > +{ 0x0832, 0x0b },
> > +{ 0x0833, 0x2c },
> > +{ 0x0834, 0x14 },
> > +{ 0x0835, 0xae },
> > +{ 0x0836, 0x0f },
> > +{ 0x0837, 0xc4 },
> > +{ 0x0838, 0x18 },
> > +{ 0x0839, 0x0e },
> > +{ 0x05ac, 0x01 },
> > +{ 0x059a, 0x00 },
> > +{ 0x059b, 0x00 },
> > +{ 0x059c, 0x01 },
> > +{ 0x0598, 0x00 },
> > +{ 0x0597, 0x14 },
> > +{ 0x05ab, 0x09 },
> > +{ 0x05a4, 0x02 },
> > +{ 0x05a3, 0x05 },
> > +{ 0x05a0, 0xc2 },
> > +{ 0x0207, 0xc4 },
> > +
> > +/*GAIN*/
> > +{ 0x0204, 0x04 },
> > +{ 0x0205, 0x00 },
> > +{ 0x0050, 0x5c },
> > +{ 0x0051, 0x44 },
> > +
> > +/*out window*/
> > +{ 0x009a, 0x66 },
> > +{ 0x0351, 0x00 },
> > +{ 0x0352, 0x06 }, //out_win_y1
> > +{ 0x0353, 0x00 },
> > +{ 0x0354, 0x08 }, //out_win_x1
> > +{ 0x034c, 0x0c },
> > +{ 0x034d, 0xc0 }, //3264
> > +{ 0x034e, 0x09 },
> > +{ 0x034f, 0x90 }, //2448
> > +
> > +/*MIPI*/
> > +{ 0x0114, 0x03 }, //0:1lane 1:2lane 3:4lane
> > +{ 0x0180, 0x65 }, //[3:0]dphy_mipi_diff
> > +{ 0x0181, 0xf0 },
> > +{ 0x0185, 0x01 },
> > +{ 0x0115, 0x30 },
> > +{ 0x011b, 0x12 },
> > +{ 0x011c, 0x12 },
> > +{ 0x0121, 0x06 }, //T_LPX
> > +{ 0x0122, 0x06 }, //T_CLK_HS_PREPARE
> > +{ 0x0123, 0x15 }, //T_CLK_zero
> > +{ 0x0124, 0x01 }, //T_CLK_PRE
> > +{ 0x0125, 0x0b }, //T_CLK_POST
> > +{ 0x0126, 0x08 }, //T_CLK_TRAIL
> > +{ 0x0129, 0x06 }, //T_HS_PREPARE
> > +{ 0x012a, 0x08 }, //T_HS_Zero
> > +{ 0x012b, 0x08 }, //T_HS_TRAIL
> > +
> > +{ 0x0a73, 0x60 },
> > +{ 0x0a70, 0x11 },
> > +{ 0x0313, 0x80 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0a70, 0x00 },
> > +{ 0x00a4, 0x80 },
> > +{ 0x0316, 0x01 },
> > +{ 0x0a67, 0x00 },
> > +{ 0x0084, 0x10 },
> > +{ 0x0102, 0x09 },
> > +
> > +{ GC08A3_TABLE_END, 0x00 }
> > +};
> > +
> > +static const struct reg_8 mode_1920x1080[] = {
> > +/*system*/
> > +{ 0x031c, 0x60 },
> > +{ 0x0337, 0x04 },
> > +{ 0x0335, 0x51 },
> > +{ 0x0336, 0x45 },
> > +{ 0x0383, 0x8b },
> > +{ 0x031a, 0x00 },
> > +{ 0x0321, 0x10 },
> > +{ 0x0327, 0x03 },
> > +{ 0x0325, 0x40 },
> > +{ 0x0326, 0x23 },
> > +{ 0x0314, 0x11 },
> > +{ 0x0315, 0xd6 },
> > +{ 0x0316, 0x01 },
> > +{ 0x0334, 0x40 },
> > +{ 0x0324, 0x42 },
> > +{ 0x031c, 0x00 },
> > +{ 0x031c, 0x9f },
> > +{ 0x0344, 0x02 },
> > +{ 0x0345, 0xa6 },
> > +{ 0x0346, 0x02 },
> > +{ 0x0347, 0xb0 },
> > +{ 0x0348, 0x07 },
> > +{ 0x0349, 0x90 }, //1936
> > +{ 0x034a, 0x04 },
> > +{ 0x034b, 0x44 }, //1092
> > +{ 0x0202, 0x03 },
> > +{ 0x0203, 0x00 }, //Exp
> > +{ 0x0340, 0x04 },
> > +{ 0x0341, 0xfc }, //FL
> > +{ 0x0342, 0x07 },
> > +{ 0x0343, 0x1c }, //LineLength
> > +
> > +{ 0x0226, 0x00 }, //min vb[15:8]
> > +{ 0x0227, 0x88 }, //min vb[7:0]
> > +{ 0x0e38, 0x49 },
> > +{ 0x0210, 0x13 },
> > +{ 0x0218, 0x00 },
> > +{ 0x0241, 0x88 },
> > +{ 0x0392, 0x60 },
> > +
> > +/*ISP*/
> > +{ 0x031c, 0x80 },
> > +{ 0x03fe, 0x10 }, //CISCTL_rst
> > +{ 0x03fe, 0x00 },
> > +{ 0x031c, 0x9f },
> > +{ 0x03fe, 0x00 },
> > +{ 0x03fe, 0x00 },
> > +{ 0x03fe, 0x00 },
> > +{ 0x03fe, 0x00 },
> > +{ 0x031c, 0x80 },
> > +{ 0x03fe, 0x10 },
> > +{ 0x03fe, 0x00 },
> > +{ 0x031c, 0x9f },
> > +{ 0x00a2, 0xac },
> > +{ 0x00a3, 0x02 },
> > +{ 0x00ab, 0xa0 },
> > +{ 0x00ac, 0x02 },
> > +{ 0x05a0, 0x82 },
> > +{ 0x05ac, 0x00 },
> > +{ 0x05ad, 0x01 },
> > +{ 0x05ae, 0x00 },
> > +{ 0x0800, 0x0a },
> > +{ 0x0801, 0x14 },
> > +{ 0x0802, 0x28 },
> > +{ 0x0803, 0x34 },
> > +{ 0x0804, 0x0e },
> > +{ 0x0805, 0x33 },
> > +{ 0x0806, 0x03 },
> > +{ 0x0807, 0x8a },
> > +{ 0x0808, 0x50 },
> > +{ 0x0809, 0x00 },
> > +{ 0x080a, 0x34 },
> > +{ 0x080b, 0x03 },
> > +{ 0x080c, 0x26 },
> > +{ 0x080d, 0x03 },
> > +{ 0x080e, 0x18 },
> > +{ 0x080f, 0x03 },
> > +{ 0x0810, 0x10 },
> > +{ 0x0811, 0x03 },
> > +{ 0x0812, 0x00 },
> > +{ 0x0813, 0x00 },
> > +{ 0x0814, 0x01 },
> > +{ 0x0815, 0x00 },
> > +{ 0x0816, 0x01 },
> > +{ 0x0817, 0x00 },
> > +{ 0x0818, 0x00 },
> > +{ 0x0819, 0x0a },
> > +{ 0x081a, 0x01 },
> > +{ 0x081b, 0x6c },
> > +{ 0x081c, 0x00 },
> > +{ 0x081d, 0x0b },
> > +{ 0x081e, 0x02 },
> > +{ 0x081f, 0x00 },
> > +{ 0x0820, 0x00 },
> > +{ 0x0821, 0x0c },
> > +{ 0x0822, 0x02 },
> > +{ 0x0823, 0xd9 },
> > +{ 0x0824, 0x00 },
> > +{ 0x0825, 0x0d },
> > +{ 0x0826, 0x03 },
> > +{ 0x0827, 0xf0 },
> > +{ 0x0828, 0x00 },
> > +{ 0x0829, 0x0e },
> > +{ 0x082a, 0x05 },
> > +{ 0x082b, 0x94 },
> > +{ 0x082c, 0x09 },
> > +{ 0x082d, 0x6e },
> > +{ 0x082e, 0x07 },
> > +{ 0x082f, 0xe6 },
> > +{ 0x0830, 0x10 },
> > +{ 0x0831, 0x0e },
> > +{ 0x0832, 0x0b },
> > +{ 0x0833, 0x2c },
> > +{ 0x0834, 0x14 },
> > +{ 0x0835, 0xae },
> > +{ 0x0836, 0x0f },
> > +{ 0x0837, 0xc4 },
> > +{ 0x0838, 0x18 },
> > +{ 0x0839, 0x0e },
> > +{ 0x05ac, 0x01 },
> > +{ 0x059a, 0x00 },
> > +{ 0x059b, 0x00 },
> > +{ 0x059c, 0x01 },
> > +{ 0x0598, 0x00 },
> > +{ 0x0597, 0x14 },
> > +{ 0x05ab, 0x09 },
> > +{ 0x05a4, 0x02 },
> > +{ 0x05a3, 0x05 },
> > +{ 0x05a0, 0xc2 },
> > +{ 0x0207, 0xc4 },
> > +
> > +/*GAIN*/
> > +{ 0x0204, 0x04 },
> > +{ 0x0205, 0x00 },
> > +{ 0x0050, 0x38 },
> > +{ 0x0051, 0x20 },
> > +
> > +/*out window*/
> > +{ 0x009a, 0x66 },
> > +{ 0x0351, 0x00 },
> > +{ 0x0352, 0x06 }, //out_win_y1
> > +{ 0x0353, 0x00 },
> > +{ 0x0354, 0x08 }, //out_win_x1
> > +{ 0x034c, 0x07 },
> > +{ 0x034d, 0x80 }, //1920
> > +{ 0x034e, 0x04 },
> > +{ 0x034f, 0x38 }, //1080
> > +
> > +/*MIPI*/
> > +{ 0x0114, 0x03 }, //0:1lane 1:2lane 3:4lane
> > +{ 0x0180, 0x65 }, //[3:0]dphy_mipi_diff
> > +{ 0x0181, 0xf0 },
> > +{ 0x0185, 0x01 },
> > +{ 0x0115, 0x30 },
> > +{ 0x011b, 0x12 },
> > +{ 0x011c, 0x12 },
> > +{ 0x0121, 0x02 }, //T_LPX
> > +{ 0x0122, 0x03 }, //T_CLK_HS_PREPARE
> > +{ 0x0123, 0x0c }, //T_CLK_zero
> > +{ 0x0124, 0x00 }, //T_CLK_PRE
> > +{ 0x0125, 0x09 }, //T_CLK_POST
> > +{ 0x0126, 0x06 }, //T_CLK_TRAIL
> > +{ 0x0129, 0x04 }, //T_HS_PREPARE
> > +{ 0x012a, 0x03 }, //T_HS_Zero
> > +{ 0x012b, 0x06 }, //T_HS_TRAIL
> > +
> > +{ 0x0a73, 0x60 },
> > +{ 0x0a70, 0x11 },
> > +{ 0x0313, 0x80 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0aff, 0x00 },
> > +{ 0x0a70, 0x00 },
> > +{ 0x00a4, 0x80 },
> > +{ 0x0316, 0x01 },
> > +{ 0x0a67, 0x00 },
> > +{ 0x0084, 0x10 },
> > +{ 0x0102, 0x09 },
> > +
> > +{ GC08A3_TABLE_END, 0x00 }
> > +};
> > +
> > +static const struct reg_8 mode_table_common[] = {
> > +{ GC08A3_STRAEMING_REG, 0x00 },
> > +/*system*/
> > +{ 0x031c, 0x60 },
> > +{ 0x0337, 0x04 },
> > +{ 0x0335, 0x51 },
> > +{ 0x0336, 0x70 },
> > +{ 0x0383, 0xbb },
> > +{ 0x031a, 0x00 },
> > +{ 0x0321, 0x10 },
> > +{ 0x0327, 0x03 },
> > +{ 0x0325, 0x40 },
> > +{ 0x0326, 0x23 },
> > +{ 0x0314, 0x11 },
> > +{ 0x0315, 0xd6 },
> > +{ 0x0316, 0x01 },
> > +{ 0x0334, 0x40 },
> > +{ 0x0324, 0x42 },
> > +{ 0x031c, 0x00 },
> > +{ 0x031c, 0x9f },
> > +{ 0x039a, 0x13 },
> > +{ 0x0084, 0x30 },
> > +{ 0x02b3, 0x08 },
> > +{ 0x0057, 0x0c },
> > +{ 0x05c3, 0x50 },
> > +{ 0x0311, 0x90 },
> > +{ 0x05a0, 0x02 },
> > +{ 0x0074, 0x0a },
> > +{ 0x0059, 0x11 },
> > +{ 0x0070, 0x05 },
> > +{ 0x0101, 0x00 }, //[1]updown [0]mirror
> > +
> > +/*analog*/
> > +{ 0x0344, 0x00 },
> > +{ 0x0345, 0x06 },
> > +{ 0x0346, 0x00 },
> > +{ 0x0347, 0x04 },
> > +{ 0x0348, 0x0c },
> > +{ 0x0349, 0xd0 }, //3280
> > +{ 0x034a, 0x09 },
> > +{ 0x034b, 0x9c }, //2460
> > +{ 0x0202, 0x09 },
> > +{ 0x0203, 0x04 }, //Exp
> > +
> > +{ 0x0219, 0x05 }, //[4]FL_depend_exp
> > +{ 0x0226, 0x00 }, //min vb[15:8]
> > +{ 0x0227, 0x28 }, //min vb[7:0]
> > +{ 0x0e0a, 0x00 },
> > +{ 0x0e0b, 0x00 },
> > +{ 0x0e24, 0x04 },
> > +{ 0x0e25, 0x04 },
> > +{ 0x0e26, 0x00 },
> > +{ 0x0e27, 0x10 },
> > +{ 0x0e01, 0x74 },
> > +{ 0x0e03, 0x47 },
> > +{ 0x0e04, 0x33 },
> > +{ 0x0e05, 0x44 },
> > +{ 0x0e06, 0x44 },
> > +{ 0x0e0c, 0x1e },
> > +{ 0x0e17, 0x3a },
> > +{ 0x0e18, 0x3c },
> > +{ 0x0e19, 0x40 },
> > +{ 0x0e1a, 0x42 },
> > +{ 0x0e28, 0x21 },
> > +{ 0x0e2b, 0x68 },
> > +{ 0x0e2c, 0x0d },
> > +{ 0x0e2d, 0x08 },
> > +{ 0x0e34, 0xf4 },
> > +{ 0x0e35, 0x44 },
> > +{ 0x0e36, 0x07 },
> > +{ 0x0e38, 0x49 },
> > +{ 0x0210, 0x13 },
> > +{ 0x0218, 0x00 },
> > +{ 0x0241, 0x88 },
> > +{ 0x0e32, 0x00 },
> > +{ 0x0e33, 0x18 },
> > +{ 0x0e42, 0x03 },
> > +{ 0x0e43, 0x80 },
> > +{ 0x0e44, 0x04 },
> > +{ 0x0e45, 0x00 },
> > +{ 0x0e4f, 0x04 },
> > +{ 0x057a, 0x20 },
> > +{ 0x0381, 0x7c },
> > +{ 0x0382, 0x9b },
> > +{ 0x0384, 0xfb },
> > +{ 0x0389, 0x38 },
> > +{ 0x038a, 0x03 },
> > +{ 0x0390, 0x6a },
> > +{ 0x0391, 0x0b },
> > +{ 0x0392, 0x60 },
> > +{ 0x0393, 0xc1 },
> > +{ 0x0396, 0xff },
> > +{ 0x0398, 0x62 },
> > +
> > +/*cisctl reset*/
> > +{ 0x031c, 0x80 },
> > +{ 0x03fe, 0x10 }, //CISCTL_rst
> > +{ 0x03fe, 0x00 },
> > +{ 0x031c, 0x9f },
> > +{ 0x03fe, 0x00 },
> > +{ 0x03fe, 0x00 },
> > +{ 0x03fe, 0x00 },
> > +{ 0x03fe, 0x00 },
> > +{ 0x031c, 0x80 },
> > +{ 0x03fe, 0x10 }, //CISCTL_rst
> > +{ 0x03fe, 0x00 },
> > +{ 0x031c, 0x9f },
> > +{ 0x0360, 0x01 },
> > +{ 0x0360, 0x00 },
> > +{ 0x0316, 0x09 },
> > +{ 0x0a67, 0x80 },
> > +{ 0x0313, 0x00 },
> > +{ 0x0a53, 0x0e },
> > +{ 0x0a65, 0x17 },
> > +{ 0x0a68, 0xa1 },
> > +{ 0x0a58, 0x00 },
> > +{ 0x0ace, 0x0c },
> > +{ 0x00a4, 0x00 },
> > +{ 0x00a5, 0x01 },
> > +{ 0x00a7, 0x09 },
> > +{ 0x00a8, 0x9c },
> > +{ 0x00a9, 0x0c },
> > +{ 0x00aa, 0xd0 },
> > +{ 0x0a8a, 0x00 },
> > +{ 0x0a8b, 0xe0 },
> > +{ 0x0a8c, 0x13 },
> > +{ 0x0a8d, 0xe8 },
> > +{ 0x0a90, 0x0a },
> > +{ 0x0a91, 0x10 },
> > +{ 0x0a92, 0xf8 },
> > +{ 0x0a71, 0xf2 },
> > +{ 0x0a72, 0x12 },
> > +{ 0x0a73, 0x64 },
> > +{ 0x0a75, 0x41 },
> > +{ 0x0a70, 0x07 },
> > +{ 0x0313, 0x80 },
> > +
> > +/*ISP*/
> > +{ 0x00a0, 0x01 },
> > +{ 0x0080, 0xd2 },
> > +{ 0x0081, 0x3f },
> > +{ 0x0087, 0x51 },
> > +{ 0x0089, 0x03 },
> > +{ 0x009b, 0x40 },
> > +{ 0x05a0, 0x82 },
> > +{ 0x05ac, 0x00 },
> > +{ 0x05ad, 0x01 },
> > +{ 0x05ae, 0x00 },
> > +{ 0x0800, 0x0a },
> > +{ 0x0801, 0x14 },
> > +{ 0x0802, 0x28 },
> > +{ 0x0803, 0x34 },
> > +{ 0x0804, 0x0e },
> > +{ 0x0805, 0x33 },
> > +{ 0x0806, 0x03 },
> > +{ 0x0807, 0x8a },
> > +{ 0x0808, 0x50 },
> > +{ 0x0809, 0x00 },
> > +{ 0x080a, 0x34 },
> > +{ 0x080b, 0x03 },
> > +{ 0x080c, 0x26 },
> > +{ 0x080d, 0x03 },
> > +{ 0x080e, 0x18 },
> > +{ 0x080f, 0x03 },
> > +{ 0x0810, 0x10 },
> > +{ 0x0811, 0x03 },
> > +{ 0x0812, 0x00 },
> > +{ 0x0813, 0x00 },
> > +{ 0x0814, 0x01 },
> > +{ 0x0815, 0x00 },
> > +{ 0x0816, 0x01 },
> > +{ 0x0817, 0x00 },
> > +{ 0x0818, 0x00 },
> > +{ 0x0819, 0x0a },
> > +{ 0x081a, 0x01 },
> > +{ 0x081b, 0x6c },
> > +{ 0x081c, 0x00 },
> > +{ 0x081d, 0x0b },
> > +{ 0x081e, 0x02 },
> > +{ 0x081f, 0x00 },
> > +{ 0x0820, 0x00 },
> > +{ 0x0821, 0x0c },
> > +{ 0x0822, 0x02 },
> > +{ 0x0823, 0xd9 },
> > +{ 0x0824, 0x00 },
> > +{ 0x0825, 0x0d },
> > +{ 0x0826, 0x03 },
> > +{ 0x0827, 0xf0 },
> > +{ 0x0828, 0x00 },
> > +{ 0x0829, 0x0e },
> > +{ 0x082a, 0x05 },
> > +{ 0x082b, 0x94 },
> > +{ 0x082c, 0x09 },
> > +{ 0x082d, 0x6e },
> > +{ 0x082e, 0x07 },
> > +{ 0x082f, 0xe6 },
> > +{ 0x0830, 0x10 },
> > +{ 0x0831, 0x0e },
> > +{ 0x0832, 0x0b },
> > +{ 0x0833, 0x2c },
> > +{ 0x0834, 0x14 },
> > +{ 0x0835, 0xae },
> > +{ 0x0836, 0x0f },
> > +{ 0x0837, 0xc4 },
> > +{ 0x0838, 0x18 },
> > +{ 0x0839, 0x0e },
> > +{ 0x05ac, 0x01 },
> > +{ 0x059a, 0x00 },
> > +{ 0x059b, 0x00 },
> > +{ 0x059c, 0x01 },
> > +{ 0x0598, 0x00 },
> > +{ 0x0597, 0x14 },
> > +{ 0x05ab, 0x09 },
> > +{ 0x05a4, 0x02 },
> > +{ 0x05a3, 0x05 },
> > +{ 0x05a0, 0xc2 },
> > +{ 0x0207, 0xc4 },
> > +
> > +/*GAIN*/
> > +{ 0x0208, 0x01 },
> > +{ 0x0209, 0x72 },
> > +{ 0x0204, 0x04 },
> > +{ 0x0205, 0x00 },
> > +
> > +{ 0x0040, 0x22 },
> > +{ 0x0041, 0x20 },
> > +{ 0x0043, 0x10 },
> > +{ 0x0044, 0x00 },
> > +{ 0x0046, 0x08 },
> > +{ 0x0047, 0xf0 },
> > +{ 0x0048, 0x0f },
> > +{ 0x004b, 0x0f },
> > +{ 0x004c, 0x00 },
> > +{ 0x0050, 0x5c },
> > +{ 0x0051, 0x44 },
> > +{ 0x005b, 0x03 },
> > +{ 0x00c0, 0x00 },
> > +{ 0x00c1, 0x80 },
> > +{ 0x00c2, 0x31 },
> > +{ 0x00c3, 0x00 },
> > +{ 0x0460, 0x04 },
> > +{ 0x0462, 0x08 },
> > +{ 0x0464, 0x0e },
> > +{ 0x0466, 0x0a },
> > +{ 0x0468, 0x12 },
> > +{ 0x046a, 0x12 },
> > +{ 0x046c, 0x10 },
> > +{ 0x046e, 0x0c },
> > +{ 0x0461, 0x03 },
> > +{ 0x0463, 0x03 },
> > +{ 0x0465, 0x03 },
> > +{ 0x0467, 0x03 },
> > +{ 0x0469, 0x04 },
> > +{ 0x046b, 0x04 },
> > +{ 0x046d, 0x04 },
> > +{ 0x046f, 0x04 },
> > +{ 0x0470, 0x04 },
> > +{ 0x0472, 0x10 },
> > +{ 0x0474, 0x26 },
> > +{ 0x0476, 0x38 },
> > +{ 0x0478, 0x20 },
> > +{ 0x047a, 0x30 },
> > +{ 0x047c, 0x38 },
> > +{ 0x047e, 0x60 },
> > +{ 0x0471, 0x05 },
> > +{ 0x0473, 0x05 },
> > +{ 0x0475, 0x05 },
> > +{ 0x0477, 0x05 },
> > +{ 0x0479, 0x04 },
> > +{ 0x047b, 0x04 },
> > +{ 0x047d, 0x04 },
> > +{ 0x047f, 0x04 },
> > +
> > +{ GC08A3_TABLE_END, 0x00 }
> > +};
> > +
> > +static const struct gc08a3_link_freq_config link_freq_configs[] =
> {
> > +[GC08A3_LINK_FREQ_336MHZ_CFG] = {
> > +.reg_list = {
> > +.num_of_regs = ARRAY_SIZE(mode_table_common),
> > +.regs = mode_table_common,
> > +}
> > +},
> > +[GC08A3_LINK_FREQ_207MHZ_CFG] = {
> > +.reg_list = {
> > +.num_of_regs = ARRAY_SIZE(mode_table_common),
> > +.regs = mode_table_common,
> > +}
> > +},
> > +
> 
> Extra blank line.
> 
[mtk]: fixed in patch:v3

> > +};
> > +
> > +enum {
> > +GC08A3_PREV,
> > +GC08A3_HS,
> > +};
> > +
> > +/*
> > + * Declare modes in order, from biggest
> > + * to smallest height.
> > + */
> > +static const struct gc08a3_mode {
> > +u8 mode_id;
> > +u32 width;
> > +u32 height;
> > +const struct gc08a3_reg_list reg_list;
> > +
> > +u32 hts; /* Horizontal timining size */
> > +u32 vts_def; /* Default vertical timining size */
> > +u32 vts_min; /* Min vertical timining size */
> > +u32 link_freq_index; /* Link frequency needed for this resolution
> */
> > +u32 max_framerate;
> > +
> 
> Extra blank line.
> 
[mtk]: fixed in patch:v3

> > +} gc08a3_modes[] = {
> > +{
> > +.mode_id = GC08A3_PREV,
> > +.width = 3264,
> > +.height = 2448,
> > +.reg_list = {
> > +.num_of_regs = ARRAY_SIZE(mode_3264x2448),
> > +.regs = mode_3264x2448,
> > +},
> > +.link_freq_index = GC08A3_LINK_FREQ_336MHZ_CFG,
> > +
> > +.hts = GC08A3_HTS_30FPS,
> > +.vts_def = GC08A3_VTS_30FPS,
> > +.vts_min = GC08A3_VTS_30FPS_MIN,
> > +.max_framerate = 300,
> > +},
> > +{
> > +.mode_id = GC08A3_HS,
> > +.width = 1920,
> > +.height = 1080,
> > +.reg_list = {
> > +.num_of_regs = ARRAY_SIZE(mode_1920x1080),
> > +.regs = mode_1920x1080,
> > +},
> > +.link_freq_index = GC08A3_LINK_FREQ_207MHZ_CFG,
> > +
> > +.hts = GC08A3_HTS_60FPS,
> > +.vts_def = GC08A3_VTS_60FPS,
> > +.vts_min = GC08A3_VTS_60FPS_MIN,
> > +.max_framerate = 600,
> > +},
> > +};
> > +
> > +static u64 to_pixel_rate(u32 f_index)
> > +{
> > +u64 pixel_rate = link_freq_menu_items[f_index] * 2 *
> GC08A3_DATA_LANES;
> > +
> > +do_div(pixel_rate, GC08A3_RGB_DEPTH);
> > +
> > +return pixel_rate;
> > +}
> > +
> > +static u64 __maybe_unused to_pixels_per_line(u32 hts, u32 f_index)
> > +{
> > +u64 ppl = hts * to_pixel_rate(f_index);
> > +
> > +do_div(ppl, GC08A3_SCLK);
> > +
> > +return ppl;
> > +}
> > +
> > +static int gc08a3_read_reg(struct gc08a3 *gc08a3, u16 reg, u16
> len, u32 *val)
> > +{
> > +struct i2c_client *client = v4l2_get_subdevdata(&gc08a3->sd);
> > +struct i2c_msg msgs[2];
> > +u8 addr_buf[2];
> > +u8 data_buf[4] = { 0 };
> > +int ret;
> > +
> > +if (len > 4)
> > +return -EINVAL;
> > +
> > +put_unaligned_be16(reg, addr_buf);
> > +msgs[0].addr = client->addr;
> > +msgs[0].flags = 0;
> > +msgs[0].len = sizeof(addr_buf);
> > +msgs[0].buf = addr_buf;
> > +msgs[1].addr = client->addr;
> > +msgs[1].flags = I2C_M_RD;
> > +msgs[1].len = len;
> > +msgs[1].buf = &data_buf[4 - len];
> > +
> > +ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
> > +if (ret != ARRAY_SIZE(msgs))
> > +return -EIO;
> > +
> > +*val = get_unaligned_be32(data_buf);
> > +
> > +return 0;
> > +}
> > +
> > +static int gc08a3_write_reg(struct gc08a3 *gc08a3, u16 reg, u16
> len, u32 val)
> > +{
> > +struct i2c_client *client = v4l2_get_subdevdata(&gc08a3->sd);
> > +u8 buf[6];
> > +
> > +if (len > 4)
> > +return -EINVAL;
> > +
> > +put_unaligned_be16(reg, buf);
> > +put_unaligned_be32(val << 8 * (4 - len), buf + 2);
> > +if (i2c_master_send(client, buf, len + 2) != len + 2)
> > +return -EIO;
> > +
> > +return 0;
> > +}
> > +
> > +static int gc08a3_write_reg_list(struct gc08a3 *gc08a3,
> > + const struct gc08a3_reg_list *r_list)
> > +{
> > +struct i2c_client *client = v4l2_get_subdevdata(&gc08a3->sd);
> > +unsigned int i;
> > +int ret;
> > +
> > +for (i = 0; i < r_list->num_of_regs; i++) {
> > +if (r_list->regs[i].address == GC08A3_TABLE_WAIT_MS) {
> > +usleep_range(r_list->regs[i].val * 1000,
> > +     r_list->regs[i].val * 1000 + 500);
> > +continue;
> > +}
> > +
> > +if (r_list->regs[i].address == GC08A3_TABLE_END)
> > +break;
> > +
> > +ret = gc08a3_write_reg(gc08a3, r_list->regs[i].address,
> > +       GC08A3_REG_VALUE_08BIT,
> > +       r_list->regs[i].val);
> > +if (ret) {
> > +dev_err_ratelimited(&client->dev,
> > +    "failed to write reg 0x%4.4x. error = %d",
> > +    r_list->regs[i].address, ret);
> > +return ret;
> > +}
> > +}
> > +
> > +return 0;
> > +}
> > +
> > +static int gc08a3_identify_module(struct gc08a3 *gc08a3)
> > +{
> > +struct i2c_client *client = v4l2_get_subdevdata(&gc08a3->sd);
> > +u32 val = 0;
> > +
> > +gc08a3_read_reg(gc08a3, GC08A3_REG_CHIP_ID,
> GC08A3_REG_VALUE_16BIT,
> > +&val);
> > +
> > +if (val != GC08A3_CHIP_ID) {
> > +dev_err(&client->dev, "chip id mismatch: 0x%x!=0x%x",
> > +GC08A3_CHIP_ID, val);
> > +return -ENXIO;
> > +}
> > +
> > +dev_info(&client->dev, "sensor_id: 0x%04x\n", val);
> > +return 0;
> > +}
> > +
> > +static inline struct gc08a3 *to_gc08a3(struct v4l2_subdev *sd)
> > +{
> > +return container_of(sd, struct gc08a3, sd);
> > +}
> > +
> > +static int __maybe_unused gc08a3_power_on(struct device *dev)
> > +{
> > +struct i2c_client *client = to_i2c_client(dev);
> > +struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +struct gc08a3 *gc08a3 = to_gc08a3(sd);
> > +int ret;
> > +
> > +dev_info(dev, "--- %s +", __func__);
> 
> Drop this. Tracing is done with ftrace. Same comment below where
> applicable.
> 
[mtk]: fixed in patch:v3

> > +
> > +gpiod_set_value_cansleep(gc08a3->enable_gpio, 0);
> > +usleep_range(2000, 3000);
> > +
> > +ret = regulator_bulk_enable(GC08A3_NUM_SUPPLIES, gc08a3-
> >supplies);
> > +if (ret < 0) {
> > +dev_err(gc08a3->dev, "failed to enable regulators: %d\n", ret);
> > +return ret;
> > +}
> > +
> > +ret = clk_prepare_enable(gc08a3->xclk);
> > +if (ret < 0) {
> > +regulator_bulk_disable(GC08A3_NUM_SUPPLIES, gc08a3->supplies);
> > +dev_err(gc08a3->dev, "clk prepare enable failed\n");
> > +return ret;
> > +}
> > +
> > +usleep_range(2000, 3000);
> > +
> > +gpiod_set_value_cansleep(gc08a3->enable_gpio, 1);
> > +usleep_range(12000, 15000);
> > +
> > +dev_info(dev, "--- %s -", __func__);
> > +
> > +return 0;
> > +}
> > +
> > +static int __maybe_unused gc08a3_power_off(struct device *dev)
> > +{
> > +struct i2c_client *client = to_i2c_client(dev);
> > +struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +struct gc08a3 *gc08a3 = to_gc08a3(sd);
> > +
> > +dev_info(dev, "--- %s +", __func__);
> > +
> > +gpiod_set_value_cansleep(gc08a3->enable_gpio, 0);
> > +
> > +clk_disable_unprepare(gc08a3->xclk);
> > +
> > +regulator_bulk_disable(GC08A3_NUM_SUPPLIES, gc08a3->supplies);
> > +usleep_range(10, 20);
> > +
> > +dev_info(dev, "--- %s -", __func__);
> > +
> > +return 0;
> > +}
> > +
> > +static int gc08a3_enum_mbus_code(struct v4l2_subdev *sd,
> > + struct v4l2_subdev_state *sd_state,
> > + struct v4l2_subdev_mbus_code_enum *code)
> > +{
> > +if (code->index > 0)
> > +return -EINVAL;
> > +
> > +code->code = GC08A3_MBUS_CODE;
> > +
> > +return 0;
> > +}
> > +
> > +static int gc08a3_enum_frame_size(struct v4l2_subdev *subdev,
> > +  struct v4l2_subdev_state *sd_state,
> > +  struct v4l2_subdev_frame_size_enum *fse)
> > +{
> > +if (fse->code != GC08A3_MBUS_CODE)
> > +return -EINVAL;
> > +
> > +if (fse->index >= ARRAY_SIZE(gc08a3_modes))
> > +return -EINVAL;
> > +
> > +fse->min_width = gc08a3_modes[fse->index].width;
> > +fse->max_width = gc08a3_modes[fse->index].width;
> > +fse->min_height = gc08a3_modes[fse->index].height;
> > +fse->max_height = gc08a3_modes[fse->index].height;
> > +
> > +return 0;
> > +}
> > +
> > +#ifdef CONFIG_VIDEO_ADV_DEBUG
> > +static int gc08a3_g_register(struct v4l2_subdev *subdev,
> > +     struct v4l2_dbg_register *reg)
> > +{
> > +int ret;
> > +u32 val;
> > +struct gc08a3 *gc08a3 = container_of(subdev, struct gc08a3, sd);
> > +
> > +ret = gc08a3_read_reg(gc08a3, reg->reg, GC08A3_REG_VALUE_08BIT,
> &val);
> > +if (ret < 0)
> > +return ret;
> > +
> > +reg->val = val;
> > +reg->size = 1;
> > +
> > +return 0;
> > +}
> > +
> > +static int gc08a3_s_register(struct v4l2_subdev *subdev,
> > +     const struct v4l2_dbg_register *reg)
> > +{
> > +struct gc08a3 *gc08a3 = container_of(subdev, struct gc08a3, sd);
> > +
> > +return gc08a3_write_reg(gc08a3, reg->reg, GC08A3_REG_VALUE_08BIT,
> > +reg->val & 0xff);
> > +}
> > +
> > +#endif
> > +
> > +static const struct v4l2_subdev_core_ops gc08a3_core_ops = {
> > +#ifdef CONFIG_VIDEO_ADV_DEBUG
> > +.g_register = gc08a3_g_register,
> > +.s_register = gc08a3_s_register,
> > +#endif
> 
> Drop these too. If you need to access registers directly from
> userspace
> for development purpose, you can do so through i2cdev.
> 
[mtk]: fixed in patch:v3

> > +};
> > +
> > +static struct v4l2_mbus_framefmt *
> > +__gc08a3_get_pad_format(struct gc08a3 *gc08a3,
> > +struct v4l2_subdev_state *sd_state, unsigned int pad,
> > +enum v4l2_subdev_format_whence which)
> > +{
> > +switch (which) {
> > +case V4L2_SUBDEV_FORMAT_TRY:
> > +return v4l2_subdev_get_try_format(&gc08a3->sd, sd_state, pad);
> > +case V4L2_SUBDEV_FORMAT_ACTIVE:
> > +return &gc08a3->fmt;
> > +default:
> > +return NULL;
> > +}
> > +}
> > +
> > +static int gc08a3_get_format(struct v4l2_subdev *sd,
> > +     struct v4l2_subdev_state *sd_state,
> > +     struct v4l2_subdev_format *format)
> > +{
> > +struct gc08a3 *gc08a3 = to_gc08a3(sd);
> > +
> > +mutex_lock(&gc08a3->mutex);
> > +format->format = *__gc08a3_get_pad_format(gc08a3, sd_state,
> format->pad,
> > +  format->which);
> > +mutex_unlock(&gc08a3->mutex);
> > +
> > +return 0;
> > +}
> > +
> > +static struct v4l2_rect *
> > +__gc08a3_get_pad_crop(struct gc08a3 *gc08a3, struct
> v4l2_subdev_state *sd_state,
> > +      unsigned int pad, enum v4l2_subdev_format_whence which)
> > +{
> > +switch (which) {
> > +case V4L2_SUBDEV_FORMAT_TRY:
> > +return v4l2_subdev_get_try_crop(&gc08a3->sd, sd_state, pad);
> > +case V4L2_SUBDEV_FORMAT_ACTIVE:
> > +return &gc08a3->crop;
> > +default:
> > +return NULL;
> > +}
> > +}
> > +
> > +static int gc08a3_update_cur_mode_controls(struct gc08a3 *gc08a3)
> > +{
> > +s64 exposure_max, h_blank;
> > +int ret = 0;
> > +
> > +ret = __v4l2_ctrl_modify_range(gc08a3->vblank,
> > +       gc08a3->cur_mode->vts_min - gc08a3->cur_mode->height,
> > +       GC08A3_VTS_MAX - gc08a3->cur_mode->height, 1,
> > +       gc08a3->cur_mode->vts_def - gc08a3->cur_mode->height);
> > +if (ret)
> > +dev_err(gc08a3->dev, "VB ctrl range update failed\n");
> > +
> > +h_blank = gc08a3->cur_mode->hts - gc08a3->cur_mode->width;
> > +ret = __v4l2_ctrl_modify_range(gc08a3->hblank, h_blank, h_blank,
> 1,
> > +       h_blank);
> > +if (ret)
> > +dev_err(gc08a3->dev, "HB ctrl range update failed\n");
> > +
> > +exposure_max = gc08a3->cur_mode->vts_def - GC08A3_EXP_MARGIN;
> > +ret = __v4l2_ctrl_modify_range(gc08a3->exposure, GC08A3_EXP_MIN,
> > +       exposure_max, GC08A3_EXP_STEP,
> > +       exposure_max);
> > +if (ret)
> > +dev_err(gc08a3->dev, "exposure ctrl range update failed\n");
> > +
> > +return ret;
> > +}
> > +
> > +static int gc08a3_set_format(struct v4l2_subdev *sd,
> > +     struct v4l2_subdev_state *sd_state,
> > +     struct v4l2_subdev_format *format)
> > +{
> > +struct gc08a3 *gc08a3 = to_gc08a3(sd);
> > +struct i2c_client *client = v4l2_get_subdevdata(&gc08a3->sd);
> > +struct device *dev = &client->dev;
> > +struct v4l2_mbus_framefmt *__format;
> > +struct v4l2_rect *__crop;
> > +const struct gc08a3_mode *mode;
> > +
> > +mutex_lock(&gc08a3->mutex);
> > +
> > +dev_dbg(dev, "---- %s, format(W x H:%d x %d)  +", __func__,
> > +format->format.width, format->format.height);
> > +
> > +__crop = __gc08a3_get_pad_crop(gc08a3, sd_state, format->pad,
> > +       format->which);
> > +
> > +mode = v4l2_find_nearest_size(gc08a3_modes,
> ARRAY_SIZE(gc08a3_modes),
> > +      width, height, format->format.width,
> > +      format->format.height);
> > +
> > +dev_dbg(dev, "----nearest mode(W x H:%d x %d)", mode->width,
> > +mode->height);
> > +
> > +__crop->width = mode->width;
> > +__crop->height = mode->height;
> > +
> > +__format = __gc08a3_get_pad_format(gc08a3, sd_state, format->pad,
> > +   format->which);
> > +__format->width = __crop->width;
> > +__format->height = __crop->height;
> > +__format->code = GC08A3_MBUS_CODE;
> > +__format->field = V4L2_FIELD_NONE;
> > +__format->colorspace = V4L2_COLORSPACE_SRGB;
> > +__format->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(__format-
> >colorspace);
> > +__format->quantization =
> > +V4L2_MAP_QUANTIZATION_DEFAULT(true,
> > +      __format->colorspace,
> > +      __format->ycbcr_enc);
> > +__format->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(__format-
> >colorspace);
> > +
> > +format->format = *__format;
> > +
> > +gc08a3->cur_mode = mode;
> > +gc08a3_update_cur_mode_controls(gc08a3);
> > +
> > +mutex_unlock(&gc08a3->mutex);
> > +
> > +return 0;
> > +}
> > +
> > +static int gc08a3_get_selection(struct v4l2_subdev *sd,
> > +struct v4l2_subdev_state *sd_state,
> > +struct v4l2_subdev_selection *sel)
> > +{
> > +struct gc08a3 *gc08a3 = to_gc08a3(sd);
> > +
> > +switch (sel->target) {
> > +case V4L2_SEL_TGT_CROP:
> > +mutex_lock(&gc08a3->mutex);
> > +sel->r = *__gc08a3_get_pad_crop(gc08a3, sd_state, sel->pad, sel-
> >which);
> > +mutex_unlock(&gc08a3->mutex);
> > +break;
> > +case V4L2_SEL_TGT_CROP_BOUNDS:
> > +sel->r.top = 0;
> > +sel->r.left = 0;
> > +sel->r.width = GC08A3_NATIVE_WIDTH;
> > +sel->r.height = GC08A3_NATIVE_HEIGHT;
> > +break;
> > +case V4L2_SEL_TGT_CROP_DEFAULT:
> > +if (gc08a3->cur_mode->width == GC08A3_NATIVE_WIDTH) {
> > +sel->r.top = 0;
> > +sel->r.left = 0;
> > +sel->r.width = GC08A3_NATIVE_WIDTH;
> > +sel->r.height = GC08A3_NATIVE_HEIGHT;
> > +} else {
> > +sel->r.top = 0;
> > +sel->r.left = 0;
> > +sel->r.width = 1920;
> > +sel->r.height = 1080;
> > +}
> > +break;
> > +default:
> > +return -EINVAL;
> > +}
> > +
> > +return 0;
> > +}
> > +
> > +static int gc08a3_entity_init_cfg(struct v4l2_subdev *subdev,
> > +  struct v4l2_subdev_state *sd_state)
> > +{
> > +struct v4l2_subdev_format fmt = {};
> > +
> > +fmt.which = sd_state ? V4L2_SUBDEV_FORMAT_TRY :
> > +       V4L2_SUBDEV_FORMAT_ACTIVE;
> > +fmt.format.width = gc08a3_modes[0].width;
> > +fmt.format.height = gc08a3_modes[0].height;
> > +
> > +gc08a3_set_format(subdev, sd_state, &fmt);
> > +
> > +return 0;
> > +}
> > +
> > +static int gc08a3_set_ctrl_hflip(struct gc08a3 *gc08a3, u32
> ctrl_val)
> > +{
> > +int ret;
> > +u32 val;
> > +
> > +ret = gc08a3_read_reg(gc08a3, GC08A3_FLIP_REG,
> GC08A3_REG_VALUE_08BIT,
> > +      &val);
> > +if (ret) {
> > +dev_err(gc08a3->dev, "read hflip register failed: %d\n", ret);
> > +return ret;
> > +}
> > +
> > +val = (ctrl_val) ? (val | GC08A3_FLIP_H_MASK) :
> > +   (val & ~GC08A3_FLIP_H_MASK);
> > +ret = gc08a3_write_reg(gc08a3, GC08A3_FLIP_REG,
> GC08A3_REG_VALUE_08BIT,
> > +       val);
> > +if (ret < 0)
> > +dev_err(gc08a3->dev, "Error %d\n", ret);
> > +
> > +return ret;
> > +}
> > +
> > +static int gc08a3_set_ctrl_vflip(struct gc08a3 *gc08a3, u32
> ctrl_val)
> > +{
> > +int ret;
> > +u32 val;
> > +
> > +ret = gc08a3_read_reg(gc08a3, GC08A3_FLIP_REG,
> GC08A3_REG_VALUE_08BIT,
> > +      &val);
> > +if (ret) {
> > +dev_err(gc08a3->dev, "read vflip register failed: %d\n", ret);
> > +return ret;
> > +}
> > +
> > +val = (ctrl_val) ? (val | GC08A3_FLIP_V_MASK) :
> > +   (val & ~GC08A3_FLIP_V_MASK);
> > +ret = gc08a3_write_reg(gc08a3, GC08A3_FLIP_REG,
> GC08A3_REG_VALUE_08BIT,
> > +       val);
> > +if (ret < 0)
> > +dev_err(gc08a3->dev, "Error %d\n", ret);
> > +
> > +return ret;
> > +}
> > +
> > +static int gc08a3_test_pattern(struct gc08a3 *gc08a3, u32
> pattern_menu)
> > +{
> > +int ret = 0;
> > +u32 pattern = 0;
> > +
> > +if (pattern_menu) {
> > +// write bit16:0x0110 -> color bar
> > +switch (pattern_menu) {
> > +case 1:
> > +pattern = 0x00;
> > +break;
> > +case 2:
> > +case 3:
> > +case 4:
> > +case 5:
> > +case 6:
> > +pattern = pattern_menu + 2;
> > +break;
> > +case 7:
> > +pattern = 0x10;
> > +break;
> > +
> > +default:
> > +dev_dbg(gc08a3->dev, "invalid pattern menu!\n");
> > +break;
> > +}
> > +
> > +ret = gc08a3_write_reg(gc08a3, GC08A3_REG_TEST_PATTERN_EN,
> > +       GC08A3_REG_VALUE_08BIT,
> > +       GC08A3_TEST_PATTERN_EN);
> > +ret = gc08a3_write_reg(gc08a3, GC08A3_REG_TEST_PATTERN_IDX,
> > +       GC08A3_REG_VALUE_08BIT, pattern);
> > +
> > +} else {
> > +ret = gc08a3_write_reg(gc08a3, GC08A3_REG_TEST_PATTERN_EN,
> > +       GC08A3_REG_VALUE_08BIT, 0x00);
> > +}
> > +
> > +return ret;
> > +}
> > +
> > +static int gc08a3_set_ctrl(struct v4l2_ctrl *ctrl)
> > +{
> > +struct gc08a3 *gc08a3 =
> > +container_of(ctrl->handler, struct gc08a3, ctrls);
> > +int ret = 0;
> > +s64 exposure_max;
> > +
> > +if (ctrl->id == V4L2_CID_VBLANK) {
> > +/* Update max exposure while meeting expected vblanking */
> > +exposure_max = gc08a3->cur_mode->height + ctrl->val -
> > +       GC08A3_EXP_MARGIN;
> > +__v4l2_ctrl_modify_range(gc08a3->exposure,
> > + gc08a3->exposure->minimum,
> > + exposure_max, gc08a3->exposure->step,
> > + exposure_max);
> > +}
> > +
> > +/*
> > + * Applying V4L2 control value only happens
> > + * when power is up for streaming
> > + */
> > +if (!pm_runtime_get_if_in_use(gc08a3->dev))
> > +return 0;
> > +
> > +switch (ctrl->id) {
> > +case V4L2_CID_EXPOSURE:
> > +ret = gc08a3_write_reg(gc08a3, GC08A3_EXP_REG,
> > +       GC08A3_REG_VALUE_16BIT, ctrl->val);
> > +break;
> > +
> > +case V4L2_CID_ANALOGUE_GAIN:
> > +ret = gc08a3_write_reg(gc08a3, GC08A3_AGAIN_REG,
> > +       GC08A3_REG_VALUE_16BIT, ctrl->val);
> > +break;
> > +
> > +case V4L2_CID_VBLANK:
> > +dev_info(gc08a3->dev, "V4L2_CID_VBLANK:height:%d, V_BLNK:%d\n",
> > + gc08a3->cur_mode->height, ctrl->val);
> 
> I would drop this too, or at the very least convert it to dev_dbg().
> There should be no message but debug messages printed by the driver
> to
> the kernel log during normal operation.
> 
[mtk]: fixed in patch:v3

> > +ret = gc08a3_write_reg(gc08a3, GC08A3_FL_REG,
> > +       GC08A3_REG_VALUE_16BIT,
> > +       gc08a3->cur_mode->height + ctrl->val);
> > +break;
> > +
> > +case V4L2_CID_HFLIP:
> > +gc08a3_set_ctrl_hflip(gc08a3, ctrl->val);
> > +break;
> > +
> > +case V4L2_CID_VFLIP:
> > +gc08a3_set_ctrl_vflip(gc08a3, ctrl->val);
> > +break;
> > +
> > +case V4L2_CID_TEST_PATTERN:
> > +ret = gc08a3_test_pattern(gc08a3, ctrl->val);
> > +break;
> > +
> > +default:
> > +break;
> > +}
> > +
> > +pm_runtime_put(gc08a3->dev);
> > +
> > +return ret;
> > +}
> > +
> > +static int get_volatile_ext_ctrl(struct v4l2_ctrl *ctrl)
> > +{
> > +int ret = 0;
> > +struct gc08a3 *gc08a3 =
> > +container_of(ctrl->handler, struct gc08a3, ctrls);
> > +struct i2c_client *client = v4l2_get_subdevdata(&gc08a3->sd);
> > +
> > +dev_dbg(&client->dev, "---- %s, CMD:0x%x\n", __func__, ctrl->id);
> > +switch (ctrl->id) {
> > +default:
> > +dev_info(&client->dev, "[gc08a3] %s, un-support CMD: 0x%x\n",
> > + __func__, ctrl->id);
> > +break;
> > +}
> > +
> > +return ret;
> > +}
> > +
> > +static int gc08a3_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
> > +{
> > +int ret = 0;
> > +
> > +switch (ctrl->id) {
> > +default:
> > +ret = get_volatile_ext_ctrl(ctrl);
> > +break;
> > +}
> > +
> > +return ret;
> > +}
> > +
> > +static int try_ext_ctrl(struct v4l2_ctrl *ctrl)
> > +{
> > +int ret = 0;
> > +struct gc08a3 *gc08a3 =
> > +container_of(ctrl->handler, struct gc08a3, ctrls);
> > +struct i2c_client *client = v4l2_get_subdevdata(&gc08a3->sd);
> > +
> > +switch (ctrl->id) {
> > +default:
> > +dev_dbg(&client->dev,
> > +"[gc08a3] un-handle CMD: 0x%x (%s : %d)\n", ctrl->id,
> > +__func__, __LINE__);
> > +break;
> > +}
> > +
> > +return ret;
> > +}
> > +
> > +static int gc08a3_try_ctrl(struct v4l2_ctrl *ctrl)
> > +{
> > +int ret = 0;
> > +
> > +switch (ctrl->id) {
> > +case V4L2_CID_EXPOSURE:
> > +case V4L2_CID_ANALOGUE_GAIN:
> > +case V4L2_CID_VBLANK:
> > +case V4L2_CID_HFLIP:
> > +case V4L2_CID_VFLIP:
> > +case V4L2_CID_TEST_PATTERN:
> > +return 0;
> > +
> > +default:
> > +ret = try_ext_ctrl(ctrl);
> > +break;
> > +}
> > +
> > +return ret;
> > +}
> > +
> > +static const struct v4l2_ctrl_ops gc08a3_ctrl_ops = {
> > +.g_volatile_ctrl = gc08a3_g_volatile_ctrl,
> > +.try_ctrl = gc08a3_try_ctrl,
> 
> Drop the .g_volatile_ctrl() and .try_ctrl() implementations, they
> don't
> do anything, and the operations are optional.
> 
[mtk]: fixed in patch:v3

> > +.s_ctrl = gc08a3_set_ctrl,
> > +};
> > +
> > +static int gc08a3_start_streaming(struct gc08a3 *gc08a3)
> > +{
> > +const struct gc08a3_mode *mode;
> > +const struct gc08a3_reg_list *reg_list;
> > +int link_freq_index;
> > +int ret;
> > +
> > +dev_info(gc08a3->dev, "%s ++\n", __func__);
> > +
> > +mutex_lock(&gc08a3->mutex);
> > +
> > +link_freq_index = gc08a3->cur_mode->link_freq_index;
> > +dev_info(gc08a3->dev, "----link_freq_index = %d ",
> link_freq_index);
> > +
> > +reg_list = &link_freq_configs[link_freq_index].reg_list;
> > +ret = gc08a3_write_reg_list(gc08a3, reg_list);
> > +if (ret) {
> > +dev_err(gc08a3->dev, "could not sent common table %d\n", ret);
> > +goto error;
> > +}
> > +
> > +mode = gc08a3->cur_mode;
> > +dev_info(gc08a3->dev, "----write regtbl: mode(id:%d, WxH:%dx%d)",
> > + mode->mode_id, mode->width, mode->height);
> > +reg_list = &mode->reg_list;
> > +
> > +ret = gc08a3_write_reg_list(gc08a3, reg_list);
> > +if (ret < 0) {
> > +dev_err(gc08a3->dev, "could not sent mode table %d\n", ret);
> > +goto error;
> > +}
> > +ret = __v4l2_ctrl_handler_setup(&gc08a3->ctrls);
> > +if (ret < 0) {
> > +dev_err(gc08a3->dev, "could not sync v4l2 controls\n");
> > +goto error;
> > +}
> > +
> > +ret = gc08a3_write_reg(gc08a3, GC08A3_STRAEMING_REG,
> > +       GC08A3_REG_VALUE_08BIT, 1);
> > +if (ret < 0) {
> > +dev_err(gc08a3->dev, "write STRAEMING_REG failed: %d\n", ret);
> > +goto error;
> > +}
> > +
> > +mutex_unlock(&gc08a3->mutex);
> > +
> > +dev_info(gc08a3->dev, "%s --\n", __func__);
> > +
> > +return 0;
> > +
> > +error:
> > +mutex_unlock(&gc08a3->mutex);
> > +return ret;
> > +}
> > +
> > +static int gc08a3_stop_streaming(struct gc08a3 *gc08a3)
> > +{
> > +int ret;
> > +
> > +dev_info(gc08a3->dev, "%s ++\n", __func__);
> > +
> > +ret = gc08a3_write_reg(gc08a3, GC08A3_STRAEMING_REG,
> > +       GC08A3_REG_VALUE_08BIT, 0);
> > +if (ret < 0)
> > +dev_err(gc08a3->dev, "could not sent stop streaming %d\n", ret);
> > +
> > +dev_info(gc08a3->dev, "%s --\n", __func__);
> > +
> > +return ret;
> > +}
> > +
> > +static int gc08a3_s_stream(struct v4l2_subdev *subdev, int enable)
> > +{
> > +struct gc08a3 *gc08a3 = to_gc08a3(subdev);
> > +int ret;
> > +
> > +if (gc08a3->streaming == enable)
> > +return 0;
> > +
> > +if (enable) {
> > +ret = pm_runtime_resume_and_get(gc08a3->dev);
> > +if (ret < 0)
> > +return ret;
> > +
> > +ret = gc08a3_start_streaming(gc08a3);
> > +if (ret < 0)
> > +goto err_rpm_put;
> > +} else {
> > +ret = gc08a3_stop_streaming(gc08a3);
> > +if (ret < 0)
> > +goto err_rpm_put;
> > +pm_runtime_put(gc08a3->dev);
> > +}
> > +
> > +gc08a3->streaming = enable;
> > +return 0;
> > +
> > +err_rpm_put:
> > +pm_runtime_put(gc08a3->dev);
> > +return ret;
> > +}
> > +
> > +static int gc08a3_g_mbus_config(struct v4l2_subdev *sd, unsigned
> int pad,
> > +struct v4l2_mbus_config *config)
> > +{
> > +config->type = V4L2_MBUS_CSI2_DPHY;
> > +config->bus.mipi_csi2.num_data_lanes = 4;
> > +config->bus.mipi_csi2.flags = 0;
> > +return 0;
> > +}
> > +
> > +static int gc08a3_g_frame_interval(struct v4l2_subdev *subdev,
> > +   struct v4l2_subdev_frame_interval *fival)
> > +{
> > +struct gc08a3 *gc08a3 = to_gc08a3(subdev);
> > +
> > +fival->interval.numerator = 1;
> > +fival->interval.denominator = gc08a3->cur_mode->max_framerate /
> 10;
> > +
> > +return 0;
> > +}
> > +
> > +static int
> > +gc08a3_enum_frame_interval(struct v4l2_subdev *subdev,
> > +   struct v4l2_subdev_state *sd_state,
> > +   struct v4l2_subdev_frame_interval_enum *fie)
> > +{
> > +const struct gc08a3_mode *mode;
> > +
> > +if (fie->index != 0)
> > +return -EINVAL;
> > +
> > +mode = v4l2_find_nearest_size(gc08a3_modes,
> ARRAY_SIZE(gc08a3_modes),
> > +      width, height, fie->width, fie->height);
> > +
> > +fie->code = GC08A3_MBUS_CODE;
> > +fie->width = mode->width;
> > +fie->height = mode->height;
> > +fie->interval.numerator = 1;
> > +fie->interval.denominator = mode->max_framerate / 10;
> > +
> > +return 0;
> > +}
> > +
> > +static const struct v4l2_subdev_video_ops gc08a3_video_ops = {
> > +.s_stream = gc08a3_s_stream,
> > +.g_frame_interval = gc08a3_g_frame_interval,
> > +.s_frame_interval = gc08a3_g_frame_interval,
> > +};
> > +
> > +static const struct v4l2_subdev_pad_ops gc08a3_subdev_pad_ops = {
> > +.enum_mbus_code = gc08a3_enum_mbus_code,
> > +.enum_frame_size = gc08a3_enum_frame_size,
> > +.enum_frame_interval = gc08a3_enum_frame_interval,
> > +.get_fmt = gc08a3_get_format,
> > +.set_fmt = gc08a3_set_format,
> > +.get_selection = gc08a3_get_selection,
> > +.init_cfg = gc08a3_entity_init_cfg,
> > +.get_mbus_config = gc08a3_g_mbus_config,
> > +};
> > +
> > +static const struct v4l2_subdev_ops gc08a3_subdev_ops = {
> > +.core = &gc08a3_core_ops,
> > +.video = &gc08a3_video_ops,
> > +.pad = &gc08a3_subdev_pad_ops,
> > +};
> > +
> > +static const struct regmap_config sensor_regmap_config = {
> > +.reg_bits = 16,
> > +.val_bits = 8,
> > +.cache_type = REGCACHE_RBTREE,
> > +};
> > +
> > +static int gc08a3_get_regulators(struct device *dev, struct gc08a3
> *gc08a3)
> > +{
> > +unsigned int i;
> > +
> > +for (i = 0; i < GC08A3_NUM_SUPPLIES; i++)
> > +gc08a3->supplies[i].supply = gc08a3_supply_name[i];
> > +
> > +return devm_regulator_bulk_get(dev, GC08A3_NUM_SUPPLIES,
> > +       gc08a3->supplies);
> > +}
> > +
> > +static int gc08a3_parse_fwnode(struct device *dev)
> > +{
> > +struct fwnode_handle *endpoint;
> > +struct v4l2_fwnode_endpoint bus_cfg = {
> > +.bus_type = V4L2_MBUS_CSI2_DPHY,
> > +};
> > +unsigned int i, j;
> > +int ret;
> > +
> > +endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
> > +if (!endpoint) {
> > +dev_err(dev, "endpoint node not found\n");
> > +return -EINVAL;
> > +}
> > +
> > +ret = v4l2_fwnode_endpoint_alloc_parse(endpoint, &bus_cfg);
> > +if (ret) {
> > +dev_err(dev, "parsing endpoint node failed\n");
> > +goto done;
> > +}
> > +
> > +if (!bus_cfg.nr_of_link_frequencies) {
> > +dev_err(dev, "no link frequencies defined");
> > +ret = -EINVAL;
> > +goto done;
> > +}
> > +
> > +for (i = 0; i < ARRAY_SIZE(link_freq_menu_items); i++) {
> > +for (j = 0; j < bus_cfg.nr_of_link_frequencies; j++) {
> > +if (link_freq_menu_items[i] ==
> > +    bus_cfg.link_frequencies[j])
> > +break;
> > +}
> > +
> > +if (j == bus_cfg.nr_of_link_frequencies) {
> > +dev_err(dev,
> > +"no link frequency %lld supported, please check DT",
> > +link_freq_menu_items[i]);
> > +ret = -EINVAL;
> > +goto done;
> > +}
> > +}
> > +
> > +done:
> > +v4l2_fwnode_endpoint_free(&bus_cfg);
> > +fwnode_handle_put(endpoint);
> > +return ret;
> > +}
> > +
> > +static int __maybe_unused gc08a3_suspend(struct device *dev)
> > +{
> > +struct i2c_client *client = to_i2c_client(dev);
> > +struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +struct gc08a3 *gc08a3 = to_gc08a3(sd);
> > +
> > +if (gc08a3->streaming)
> > +gc08a3_stop_streaming(gc08a3);
> > +
> > +return 0;
> > +}
> > +
> > +static int __maybe_unused gc08a3_resume(struct device *dev)
> > +{
> > +struct i2c_client *client = to_i2c_client(dev);
> > +struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +struct gc08a3 *gc08a3 = to_gc08a3(sd);
> > +int ret;
> > +
> > +if (gc08a3->streaming) {
> > +ret = gc08a3_start_streaming(gc08a3);
> > +if (ret)
> > +goto error;
> > +}
> > +
> > +return 0;
> > +
> > +error:
> > +gc08a3_stop_streaming(gc08a3);
> > +gc08a3->streaming = 0;
> > +return ret;
> > +}
> 
> No need for system suspend/resume operations. Please read
> Documentation/driver-api/media/camera-sensor.rst in the master branch
> of
> git://linuxtv.org/media_stage.git for an explanation.
> 
[mtk]: fixed in patch:v3

> > +
> > +static int gc08a3_init_controls(struct gc08a3 *gc08a3)
> > +{
> > +struct i2c_client *client = v4l2_get_subdevdata(&gc08a3->sd);
> > +const struct v4l2_ctrl_ops *ops = &gc08a3_ctrl_ops;
> > +struct v4l2_fwnode_device_properties props;
> > +struct v4l2_ctrl_handler *ctrl_hdlr;
> > +s64 exposure_max, h_blank;
> > +int ret;
> > +
> > +ctrl_hdlr = &gc08a3->ctrls;
> > +ret = v4l2_ctrl_handler_init(ctrl_hdlr, 10);
> > +if (ret)
> > +return ret;
> > +
> > +ctrl_hdlr->lock = &gc08a3->mutex;
> > +
> > +gc08a3->link_freq =
> > +v4l2_ctrl_new_int_menu(ctrl_hdlr,
> > +       &gc08a3_ctrl_ops,
> > +       V4L2_CID_LINK_FREQ,
> > +       ARRAY_SIZE(link_freq_menu_items) - 1,
> > +       0, link_freq_menu_items);
> > +if (gc08a3->link_freq)
> > +gc08a3->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> > +
> > +gc08a3->pixel_rate =
> > +v4l2_ctrl_new_std(ctrl_hdlr,
> > +  &gc08a3_ctrl_ops,
> > +  V4L2_CID_PIXEL_RATE, 0,
> > +  to_pixel_rate(GC08A3_LINK_FREQ_336MHZ_CFG), 1,
> > +  to_pixel_rate(GC08A3_LINK_FREQ_336MHZ_CFG));
> > +
> > +gc08a3->vblank =
> > +v4l2_ctrl_new_std(ctrl_hdlr,
> > +  &gc08a3_ctrl_ops, V4L2_CID_VBLANK,
> > +  gc08a3->cur_mode->vts_min - gc08a3->cur_mode->height,
> > +  GC08A3_VTS_MAX - gc08a3->cur_mode->height, 1,
> > +  gc08a3->cur_mode->vts_def - gc08a3->cur_mode->height);
> > +
> > +h_blank = gc08a3->cur_mode->hts - gc08a3->cur_mode->width;
> > +gc08a3->hblank = v4l2_ctrl_new_std(ctrl_hdlr, &gc08a3_ctrl_ops,
> > +   V4L2_CID_HBLANK, h_blank, h_blank, 1,
> > +   h_blank);
> > +if (gc08a3->hblank)
> > +gc08a3->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> > +
> > +v4l2_ctrl_new_std(ctrl_hdlr, &gc08a3_ctrl_ops,
> > +  V4L2_CID_ANALOGUE_GAIN, GC08A3_AGAIN_MIN,
> > +  GC08A3_AGAIN_MAX, GC08A3_AGAIN_STEP,
> > +  GC08A3_AGAIN_MIN);
> > +
> > +exposure_max = gc08a3->cur_mode->vts_def - GC08A3_EXP_MARGIN;
> > +gc08a3->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &gc08a3_ctrl_ops,
> > +     V4L2_CID_EXPOSURE, GC08A3_EXP_MIN,
> > +     exposure_max, GC08A3_EXP_STEP,
> > +     exposure_max);
> > +
> > +v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &gc08a3_ctrl_ops,
> > +     V4L2_CID_TEST_PATTERN,
> > +     ARRAY_SIZE(gc08a3_test_pattern_menu) - 1,
> > +     0, 0, gc08a3_test_pattern_menu);
> > +
> > +v4l2_ctrl_new_std(ctrl_hdlr, &gc08a3_ctrl_ops, V4L2_CID_HFLIP, 0,
> > +  1, 1, 0);
> > +
> > +v4l2_ctrl_new_std(ctrl_hdlr, &gc08a3_ctrl_ops, V4L2_CID_VFLIP, 0,
> > +  1, 1, 0);
> > +
> > +/* register properties to fwnode (e.g. rotation, orientation) */
> > +ret = v4l2_fwnode_device_parse(&client->dev, &props);
> > +if (ret)
> > +goto error_ctrls;
> > +
> > +ret = v4l2_ctrl_new_fwnode_properties(ctrl_hdlr, ops, &props);
> > +if (ret)
> > +goto error_ctrls;
> > +
> > +if (ctrl_hdlr->error) {
> > +ret = ctrl_hdlr->error;
> > +goto error_ctrls;
> > +}
> > +
> > +gc08a3->sd.ctrl_handler = ctrl_hdlr;
> > +
> > +return 0;
> > +
> > +error_ctrls:
> > +v4l2_ctrl_handler_free(ctrl_hdlr);
> > +
> > +return ret;
> > +}
> > +
> > +static int gc08a3_probe(struct i2c_client *client)
> > +{
> > +struct device *dev = &client->dev;
> > +struct gc08a3 *gc08a3;
> > +int ret;
> > +
> > +dev_info(dev, "--- %s +", __func__);
> > +
> > +ret = gc08a3_parse_fwnode(dev);
> > +if (ret)
> > +return ret;
> > +
> > +gc08a3 = devm_kzalloc(dev, sizeof(*gc08a3), GFP_KERNEL);
> > +if (!gc08a3)
> > +return -ENOMEM;
> > +
> > +gc08a3->dev = dev;
> > +
> > +gc08a3->xclk = devm_clk_get(dev, NULL);
> > +if (IS_ERR(gc08a3->xclk)) {
> > +dev_err(dev, "could not get xclk\n");
> > +return PTR_ERR(gc08a3->xclk);
> > +}
> > +
> > +ret = clk_set_rate(gc08a3->xclk, GC08A3_DEFAULT_CLK_FREQ);
> > +if (ret) {
> > +dev_err(dev, "could not set xclk frequency\n");
> > +return ret;
> > +}
> > +
> > +ret = gc08a3_get_regulators(dev, gc08a3);
> > +if (ret < 0) {
> > +dev_err(dev, "cannot get regulators\n");
> > +return ret;
> > +}
> > +
> > +gc08a3->enable_gpio = devm_gpiod_get(dev, "enable",
> GPIOD_OUT_LOW);
> > +if (IS_ERR(gc08a3->enable_gpio)) {
> > +dev_err(dev, "cannot get enable gpio\n");
> > +return PTR_ERR(gc08a3->enable_gpio);
> > +}
> > +
> > +gc08a3->regmap = devm_regmap_init_i2c(client,
> &sensor_regmap_config);
> > +if (IS_ERR(gc08a3->regmap)) {
> > +dev_err(dev, "regmap init failed\n");
> > +return PTR_ERR(gc08a3->regmap);
> > +}
> > +
> > +v4l2_i2c_subdev_init(&gc08a3->sd, client, &gc08a3_subdev_ops);
> > +
> > +gc08a3_power_on(gc08a3->dev);
> > +
> > +ret = gc08a3_identify_module(gc08a3);
> > +if (ret) {
> > +dev_err(&client->dev, "failed to find sensor: %d\n", ret);
> > +gc08a3_power_off(gc08a3->dev);
> > +return ret;
> > +}
> > +
> > +mutex_init(&gc08a3->mutex);
> > +gc08a3->cur_mode = &gc08a3_modes[0];
> > +
> > +ret = gc08a3_init_controls(gc08a3);
> > +if (ret) {
> > +dev_err(&client->dev, "failed to init controls: %d", ret);
> > +goto free_ctrl;
> > +}
> > +
> > +gc08a3->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> > +gc08a3->pad.flags = MEDIA_PAD_FL_SOURCE;
> > +gc08a3->sd.dev = &client->dev;
> > +gc08a3->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> > +
> > +dev_dbg(&client->dev, "gc08a3->sd.name: %s, dev->of_node->name:
> %s\n",
> > +gc08a3->sd.name, dev->of_node->name);
> > +if (V4L2_SUBDEV_NAME_SIZE - strlen(gc08a3->sd.name) - 2 <
> > +    strlen(dev->of_node->name)) {
> > +dev_err(&client->dev,
> > +"the string length of (sd.name + of_node->name) is too long.\n");
> > +return -EINVAL;
> > +}
> > +strncat(gc08a3->sd.name, " ", 1);
> > +strncat(gc08a3->sd.name, dev->of_node->name,
> > +V4L2_SUBDEV_NAME_SIZE - strlen(gc08a3->sd.name) - 2);
> > +dev_dbg(&client->dev, "after: gc08a3->sd.name: %s\n", gc08a3-
> >sd.name);
> > +
> > +ret = media_entity_pads_init(&gc08a3->sd.entity, 1, &gc08a3->pad);
> > +if (ret < 0) {
> > +dev_err(dev, "could not register media entity\n");
> > +goto free_ctrl;
> > +}
> > +
> > +ret = v4l2_async_register_subdev_sensor(&gc08a3->sd);
> > +if (ret < 0) {
> > +dev_err(dev, "could not register v4l2 device\n");
> > +goto free_entity;
> > +}
> > +
> > +pm_runtime_set_active(gc08a3->dev);
> > +pm_runtime_enable(gc08a3->dev);
> > +pm_runtime_idle(gc08a3->dev);
> 
> Please see the imx219 driver for an example of how to correctly
> implement runtime PM support. Please also use PM runtime autosuspend.
> 
[mtk]: fixed in patch:v3

> > +
> > +dev_info(dev, "--- %s -", __func__);
> > +
> > +return 0;
> > +
> > +free_entity:
> > +media_entity_cleanup(&gc08a3->sd.entity);
> > +free_ctrl:
> > +mutex_destroy(&gc08a3->mutex);
> > +v4l2_ctrl_handler_free(&gc08a3->ctrls);
> > +pm_runtime_disable(gc08a3->dev);
> > +
> > +return ret;
> > +}
> > +
> > +static void gc08a3_remove(struct i2c_client *client)
> > +{
> > +struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > +struct gc08a3 *gc08a3 = to_gc08a3(sd);
> > +
> > +v4l2_async_unregister_subdev(&gc08a3->sd);
> > +media_entity_cleanup(&gc08a3->sd.entity);
> > +v4l2_ctrl_handler_free(&gc08a3->ctrls);
> > +
> > +pm_runtime_disable(&client->dev);
> > +pm_runtime_set_suspended(&client->dev);
> > +
> > +mutex_destroy(&gc08a3->mutex);
> > +}
> > +
> > +static const struct of_device_id gc08a3_of_match[] = {
> > +{ .compatible = "GalaxyCore,gc08a3" },
> > +{}
> > +};
> > +MODULE_DEVICE_TABLE(of, gc08a3_of_match);
> > +
> > +static const struct dev_pm_ops gc08a3_pm_ops = {
> > +SET_SYSTEM_SLEEP_PM_OPS(gc08a3_suspend, gc08a3_resume)
> > +SET_RUNTIME_PM_OPS(gc08a3_power_off, gc08a3_power_on, NULL)
> > +};
> > +
> > +static struct i2c_driver gc08a3_i2c_driver = {
> > +.driver = {
> > +.of_match_table = gc08a3_of_match,
> > +.pm = &gc08a3_pm_ops,
> > +.name  = "gc08a3",
> > +},
> > +.probe_new  = gc08a3_probe,
> > +.remove = gc08a3_remove,
> > +};
> > +
> > +module_i2c_driver(gc08a3_i2c_driver);
> > +
> > +MODULE_DESCRIPTION("GalaxyCore gc08a3 Camera driver");
> > +MODULE_AUTHOR("Zhi Mao <zhi.mao@...iatek.com>");
> > +MODULE_LICENSE("GPL");
> 
> -- 
> Regards,
> 
> Laurent Pinchart

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