Re: [PATCH v3 3/5] media: i2c: add driver for the SK Hynix Hi-846 8M pixel camera

Laurent Pinchart
2021-06-01T00:15:08Z

Hi Martin,

Thank you for the patch.

On Mon, May 31, 2021 at 02:07:35PM +0200, Martin Kepplinger wrote:
> The SK Hynix Hi-846 is a 1/4" 8M Pixel CMOS Image Sensor. It supports
> usual features like I2C control, CSI-2 for frame data, digital/analog
> gain control or test patterns.
>
> This driver supports the 640x480, 1280x720 and 1632x1224 resolution
> modes. It supports runtime PM in order not to draw any unnecessary power.
>
> The part is also called YACG4D0C9SHC and a datasheet can be found at
> https://product.skhynix.com/products/cis/cis.go
>
> The large sets of partly undocumented register values are for example
> found when searching for the hi846_mipi_raw_Sensor.c Android driver.

A common story, unfortunately :-S

I've done an initial review, I'll likely have more comments on v4, but
you should have quite a few things to address already :-)

> Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
> ---
> MAINTAINERS | 6 +
> drivers/media/i2c/Kconfig | 13 +
> drivers/media/i2c/Makefile | 1 +
> drivers/media/i2c/hi846.c | 2138 ++++++++++++++++++++++++++++++++++++
> 4 files changed, 2158 insertions(+)
> create mode 100644 drivers/media/i2c/hi846.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 503fd21901f1..27283b289123 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -8432,6 +8432,12 @@ S: Maintained
> T: git git://linuxtv.org/media_tree.git
> F: drivers/media/i2c/hi556.c
>
> +HYNIX HI846 SENSOR DRIVER
> +M: Martin Kepplinger <martin.kepplinger@puri.sm>
> +L: linux-media@vger.kernel.org
> +S: Maintained
> +F: drivers/media/i2c/hi846.c
> +
> Hyper-V/Azure CORE AND DRIVERS
> M: "K. Y. Srinivasan" <kys@microsoft.com>
> M: Haiyang Zhang <haiyangz@microsoft.com>
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 462c0e059754..f8cf5bf8eb68 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -738,6 +738,19 @@ config VIDEO_HI556
> To compile this driver as a module, choose M here: the
> module will be called hi556.
>
> +config VIDEO_HI846
> + tristate "Hynix Hi-846 sensor support"
> + depends on I2C && VIDEO_V4L2
> + select MEDIA_CONTROLLER
> + select VIDEO_V4L2_SUBDEV_API
> + select V4L2_FWNODE
> + help
> + This is a Video4Linux2 sensor driver for the Hynix
> + Hi-846 camera.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called hi846.
> +
> config VIDEO_IMX214
> tristate "Sony IMX214 sensor support"
> depends on GPIOLIB && I2C && VIDEO_V4L2
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index 0c067beca066..1194c5e6708b 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -116,6 +116,7 @@ obj-$(CONFIG_VIDEO_ML86V7667) += ml86v7667.o
> obj-$(CONFIG_VIDEO_OV2659) += ov2659.o
> obj-$(CONFIG_VIDEO_TC358743) += tc358743.o
> obj-$(CONFIG_VIDEO_HI556) += hi556.o
> +obj-$(CONFIG_VIDEO_HI846) += hi846.o
> obj-$(CONFIG_VIDEO_IMX214) += imx214.o
> obj-$(CONFIG_VIDEO_IMX219) += imx219.o
> obj-$(CONFIG_VIDEO_IMX258) += imx258.o
> diff --git a/drivers/media/i2c/hi846.c b/drivers/media/i2c/hi846.c
> new file mode 100644
> index 000000000000..80d1ccb15123
> --- /dev/null
> +++ b/drivers/media/i2c/hi846.c
> @@ -0,0 +1,2138 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2021 Purism SPC
> +
> +#include <asm/unaligned.h>
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/gpio.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of_graph.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/pm.h>

Please keep the headers sorted alphabetically.

> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-fwnode.h>
> +
> +
> +#define HI846_MEDIA_BUS_FORMAT MEDIA_BUS_FMT_SGBRG10_1X10
> +#define HI846_RGB_DEPTH 10
> +#define DEFAULT_FPS 30

Not used.

> +
> +/* Frame length lines / Vertical timings */
> +#define HI846_REG_FLL 0x0006
> +#define HI846_FLL_MAX 0xffff
> +
> +/* Horizontal timing */
> +#define HI846_REG_LLP 0x0008
> +#define HI846_LINE_LENGTH 3800
> +
> +#define HI846_REG_BINNING_MODE 0x000c
> +
> +#define HI846_REG_IMAGE_ORIENTATION 0x000e
> +
> +#define HI846_REG_UNKNOWN_0022 0x0022
> +
> +#define HI846_REG_Y_ADDR_START_VACT_H 0x0026
> +#define HI846_REG_Y_ADDR_START_VACT_L 0x0027
> +#define HI846_REG_UNKNOWN_0028 0x0028
> +
> +#define HI846_REG_Y_ADDR_END_VACT_H 0x002c
> +#define HI846_REG_Y_ADDR_END_VACT_L 0x002d
> +
> +#define HI846_REG_Y_ODD_INC_FOBP 0x002e
> +#define HI846_REG_Y_EVEN_INC_FOBP 0x002f
> +
> +#define HI846_REG_Y_ODD_INC_VACT 0x0032
> +#define HI846_REG_Y_EVEN_INC_VACT 0x0033
> +
> +#define HI846_REG_GROUPED_PARA_HOLD 0x0046
> +
> +#define HI846_REG_TG_ENABLE 0x004c
> +
> +#define HI846_REG_UNKNOWN_005C 0x005c
> +
> +#define HI846_REG_UNKNOWN_006A 0x006a
> +
> +/* Long exposure time. Actually, exposure is a 20 bit value that

The kernel coding style starts multi-line comments with '/*' on a line
of its own.

> + * includes the lower 4 bits of 0x0073 too. only 16 bit are used
> + * right now
> + */
> +#define HI846_REG_EXPOSURE 0x0074
> +#define HI846_EXPOSURE_MIN 6
> +#define HI846_EXPOSURE_MAX_MARGIN 2
> +#define HI846_EXPOSURE_STEP 1
> +
> +/* Analog gain controls from sensor */
> +#define HI846_REG_ANALOG_GAIN 0x0077
> +#define HI846_ANAL_GAIN_MIN 0
> +#define HI846_ANAL_GAIN_MAX 240
> +#define HI846_ANAL_GAIN_STEP 8
> +
> +/* Digital gain controls from sensor */
> +#define HI846_REG_MWB_GR_GAIN_H 0x0078
> +#define HI846_REG_MWB_GR_GAIN_L 0x0079
> +#define HI846_REG_MWB_GB_GAIN_H 0x007a
> +#define HI846_REG_MWB_GB_GAIN_L 0x007b
> +#define HI846_REG_MWB_R_GAIN_H 0x007c
> +#define HI846_REG_MWB_R_GAIN_L 0x007d
> +#define HI846_REG_MWB_B_GAIN_H 0x007e
> +#define HI846_REG_MWB_B_GAIN_L 0x007f
> +#define HI846_DGTL_GAIN_MIN 0
> +#define HI846_DGTL_GAIN_MAX 8191
> +#define HI846_DGTL_GAIN_STEP 1
> +#define HI846_DGTL_GAIN_DEFAULT 256
> +
> +#define HI846_REG_X_ADDR_START_HACT_H 0x0120
> +#define HI846_REG_X_ADDR_END_HACT_H 0x0122
> +
> +#define HI846_REG_UNKNOWN_012A 0x012a
> +
> +#define HI846_REG_UNKNOWN_0200 0x0200
> +
> +#define HI846_REG_UNKNOWN_021C 0x021c
> +#define HI846_REG_UNKNOWN_021E 0x021e
> +
> +#define HI846_REG_UNKNOWN_0402 0x0402
> +#define HI846_REG_UNKNOWN_0404 0x0404
> +#define HI846_REG_UNKNOWN_0408 0x0408
> +#define HI846_REG_UNKNOWN_0410 0x0410
> +#define HI846_REG_UNKNOWN_0412 0x0412
> +#define HI846_REG_UNKNOWN_0414 0x0414
> +
> +#define HI846_REG_UNKNOWN_0418 0x0418
> +
> +#define HI846_REG_UNKNOWN_051E 0x051e
> +
> +/* Formatter */
> +#define HI846_REG_X_START_H 0x0804
> +#define HI846_REG_X_START_L 0x0805
> +
> +/* MIPI */
> +#define HI846_REG_UNKNOWN_0900 0x0900
> +#define HI846_REG_MIPI_TX_OP_EN 0x0901
> +#define HI846_REG_MIPI_TX_OP_MODE 0x0902
> +#define HI846_RAW8 BIT(5)
> +
> +#define HI846_REG_UNKNOWN_090C 0x090c
> +#define HI846_REG_UNKNOWN_090E 0x090e
> +
> +#define HI846_REG_UNKNOWN_0914 0x0914
> +#define HI846_REG_TLPX 0x0915
> +#define HI846_REG_TCLK_PREPARE 0x0916
> +#define HI846_REG_TCLK_ZERO 0x0917
> +#define HI846_REG_UNKNOWN_0918 0x0918
> +#define HI846_REG_THS_PREPARE 0x0919
> +#define HI846_REG_THS_ZERO 0x091a
> +#define HI846_REG_THS_TRAIL 0x091b
> +#define HI846_REG_TCLK_POST 0x091c
> +#define HI846_REG_TCLK_TRAIL_MIN 0x091d
> +#define HI846_REG_UNKNOWN_091E 0x091e
> +
> +#define HI846_REG_UNKNOWN_0954 0x0954
> +#define HI846_REG_UNKNOWN_0956 0x0956
> +#define HI846_REG_UNKNOWN_0958 0x0958
> +#define HI846_REG_UNKNOWN_095A 0x095a
> +
> +/* ISP Common */
> +#define HI846_REG_MODE_SELECT 0x0a00
> +#define HI846_MODE_STANDBY 0x00
> +#define HI846_MODE_STREAMING 0x01
> +#define HI846_REG_FAST_STANDBY_MODE 0x0a02
> +#define HI846_REG_ISP_EN_H 0x0a04
> +
> +/* Test Pattern Control */
> +#define HI846_REG_ISP 0x0a05
> +#define HI846_REG_ISP_TPG_EN 0x01
> +#define HI846_REG_TEST_PATTERN 0x020a /* 1-9 */
> +
> +#define HI846_REG_UNKNOWN_0A0C 0x0a0c
> +
> +/* Windowing */
> +#define HI846_REG_X_OUTPUT_SIZE_H 0x0a12
> +#define HI846_REG_X_OUTPUT_SIZE_L 0x0a13
> +#define HI846_REG_Y_OUTPUT_SIZE_H 0x0a14
> +#define HI846_REG_Y_OUTPUT_SIZE_L 0x0a15
> +
> +/* ISP Common */
> +#define HI846_REG_PEDESTAL_EN 0x0a1a
> +
> +#define HI846_REG_UNKNOWN_0A1E 0x0a1e
> +
> +/* Horizontal Binning Mode */
> +#define HI846_REG_HBIN_MODE 0x0a22
> +
> +#define HI846_REG_UNKNOWN_0A24 0x0a24
> +#define HI846_REG_UNKNOWN_0B02 0x0b02
> +#define HI846_REG_UNKNOWN_0B10 0x0b10
> +#define HI846_REG_UNKNOWN_0B12 0x0b12
> +#define HI846_REG_UNKNOWN_0B14 0x0b14
> +
> +/* BLC (Black Level Calibration) */
> +#define HI846_REG_BLC_CTL0 0x0c00
> +
> +#define HI846_REG_UNKNOWN_0C06 0x0c06
> +#define HI846_REG_UNKNOWN_0C10 0x0c10
> +#define HI846_REG_UNKNOWN_0C12 0x0c12
> +#define HI846_REG_UNKNOWN_0C14 0x0c14
> +#define HI846_REG_UNKNOWN_0C16 0x0c16
> +
> +#define HI846_REG_UNKNOWN_0E04 0x0e04
> +
> +#define HI846_REG_CHIP_ID_L 0x0f16
> +#define HI846_REG_CHIP_ID_H 0x0f17
> +#define HI846_CHIP_ID_L 0x46
> +#define HI846_CHIP_ID_H 0x08
> +
> +#define HI846_REG_UNKNOWN_0F04 0x0f04
> +#define HI846_REG_UNKNOWN_0F08 0x0f08
> +
> +/* PLL */
> +#define HI846_REG_PLL_CFG_MIPI2_H 0x0f2a
> +#define HI846_REG_PLL_CFG_MIPI2_L 0x0f2b
> +
> +#define HI846_REG_UNKNOWN_0F30 0x0f30
> +#define HI846_REG_PLL_CFG_RAMP1_H 0x0f32
> +#define HI846_REG_UNKNOWN_0F36 0x0f36
> +#define HI846_REG_PLL_CFG_MIPI1_H 0x0f38
> +
> +#define HI846_REG_UNKNOWN_2008 0x2008
> +#define HI846_REG_UNKNOWN_326E 0x326e
> +
> +struct hi846_reg {
> + u16 address;
> + u16 val;
> +};
> +
> +struct hi846_reg_list {
> + u32 num_of_regs;
> + const struct hi846_reg *regs;
> +};
> +
> +struct hi846_mode {
> + /* Frame width in pixels */
> + u32 width;
> +
> + /* Frame height in pixels */
> + u32 height;
> +
> + /* Horizontal timing size */
> + u32 llp;
> +
> + /* Link frequency needed for this resolution */
> + u8 link_freq_index;
> +
> + u16 fps;
> +
> + /* vertical timining size */
> + u16 frame_len;
> +
> + const struct hi846_reg_list reg_list_config;
> + const struct hi846_reg_list reg_list_2lane;
> + const struct hi846_reg_list reg_list_4lane;
> +};
> +
> +#define to_hi846(_sd) container_of(_sd, struct hi846, sd)

Could you replace the macro with an inline function ? It provides
additional compile-time type checks.

> +
> +static const struct hi846_reg hi846_init_2lane[] = {
> + {HI846_REG_MODE_SELECT, 0x0000},
> + /* regs below are unknown */
> + {0x2000, 0x100A},

Lower-case for hex constants please.

> + {0x2002, 0x00FF},
> + {0x2004, 0x0007},
> + {0x2006, 0x3FFF},
> + {0x2008, 0x3FFF},
> + {0x200A, 0xC216},
> + {0x200C, 0x1292},
> + {0x200E, 0xC01A},
> + {0x2010, 0x403D},
> + {0x2012, 0x000E},
> + {0x2014, 0x403E},
> + {0x2016, 0x0B80},
> + {0x2018, 0x403F},
> + {0x201A, 0x82AE},
> + {0x201C, 0x1292},
> + {0x201E, 0xC00C},
> + {0x2020, 0x4130},
> + {0x2022, 0x43E2},
> + {0x2024, 0x0180},
> + {0x2026, 0x4130},
> + {0x2028, 0x7400},
> + {0x202A, 0x5000},
> + {0x202C, 0x0253},
> + {0x202E, 0x0AD1},
> + {0x2030, 0x2360},
> + {0x2032, 0x0009},
> + {0x2034, 0x5020},
> + {0x2036, 0x000B},
> + {0x2038, 0x0002},
> + {0x203A, 0x0044},
> + {0x203C, 0x0016},
> + {0x203E, 0x1792},
> + {0x2040, 0x7002},
> + {0x2042, 0x154F},
> + {0x2044, 0x00D5},
> + {0x2046, 0x000B},
> + {0x2048, 0x0019},
> + {0x204A, 0x1698},
> + {0x204C, 0x000E},
> + {0x204E, 0x099A},
> + {0x2050, 0x0058},
> + {0x2052, 0x7000},
> + {0x2054, 0x1799},
> + {0x2056, 0x0310},
> + {0x2058, 0x03C3},
> + {0x205A, 0x004C},
> + {0x205C, 0x064A},
> + {0x205E, 0x0001},
> + {0x2060, 0x0007},
> + {0x2062, 0x0BC7},
> + {0x2064, 0x0055},
> + {0x2066, 0x7000},
> + {0x2068, 0x1550},
> + {0x206A, 0x158A},
> + {0x206C, 0x0004},
> + {0x206E, 0x1488},
> + {0x2070, 0x7010},
> + {0x2072, 0x1508},
> + {0x2074, 0x0004},
> + {0x2076, 0x0016},
> + {0x2078, 0x03D5},
> + {0x207A, 0x0055},
> + {0x207C, 0x08CA},
> + {0x207E, 0x2019},
> + {0x2080, 0x0007},
> + {0x2082, 0x7057},
> + {0x2084, 0x0FC7},
> + {0x2086, 0x5041},
> + {0x2088, 0x12C8},
> + {0x208A, 0x5060},
> + {0x208C, 0x5080},
> + {0x208E, 0x2084},
> + {0x2090, 0x12C8},
> + {0x2092, 0x7800},
> + {0x2094, 0x0802},
> + {0x2096, 0x040F},
> + {0x2098, 0x1007},
> + {0x209A, 0x0803},
> + {0x209C, 0x080B},
> + {0x209E, 0x3803},
> + {0x20A0, 0x0807},
> + {0x20A2, 0x0404},
> + {0x20A4, 0x0400},
> + {0x20A6, 0xFFFF},
> + {0x20A8, 0xF0B2},
> + {0x20AA, 0xFFEF},
> + {0x20AC, 0x0A84},
> + {0x20AE, 0x1292},
> + {0x20B0, 0xC02E},
> + {0x20B2, 0x4130},
> + {0x23FE, 0xC056},
> + {0x3232, 0xFC0C},
> + {0x3236, 0xFC22},
> + {0x3248, 0xFCA8},
> + {0x326A, 0x8302},
> + {0x326C, 0x830A},
> + {0x326E, 0x0000},
> + {0x32CA, 0xFC28},
> + {0x32CC, 0xC3BC},
> + {0x32CE, 0xC34C},
> + {0x32D0, 0xC35A},
> + {0x32D2, 0xC368},
> + {0x32D4, 0xC376},
> + {0x32D6, 0xC3C2},
> + {0x32D8, 0xC3E6},
> + {0x32DA, 0x0003},
> + {0x32DC, 0x0003},
> + {0x32DE, 0x00C7},
> + {0x32E0, 0x0031},
> + {0x32E2, 0x0031},
> + {0x32E4, 0x0031},
> + {0x32E6, 0xFC28},
> + {0x32E8, 0xC3BC},
> + {0x32EA, 0xC384},
> + {0x32EC, 0xC392},
> + {0x32EE, 0xC3A0},
> + {0x32F0, 0xC3AE},
> + {0x32F2, 0xC3C4},
> + {0x32F4, 0xC3E6},
> + {0x32F6, 0x0003},
> + {0x32F8, 0x0003},
> + {0x32FA, 0x00C7},
> + {0x32FC, 0x0031},
> + {0x32FE, 0x0031},
> + {0x3300, 0x0031},
> + {0x3302, 0x82CA},
> + {0x3304, 0xC164},
> + {0x3306, 0x82E6},
> + {0x3308, 0xC19C},
> + {0x330A, 0x001F},
> + {0x330C, 0x001A},
> + {0x330E, 0x0034},
> + {0x3310, 0x0000},
> + {0x3312, 0x0000},
> + {0x3314, 0xFC94},
> + {0x3316, 0xC3D8},
> + /* regs above are unknown */
> + {HI846_REG_MODE_SELECT, 0x0000},
> + {HI846_REG_UNKNOWN_0E04, 0x0012},
> + {HI846_REG_Y_ODD_INC_FOBP, 0x1111},
> + {HI846_REG_Y_ODD_INC_VACT, 0x1111},
> + {HI846_REG_UNKNOWN_0022, 0x0008},
> + {HI846_REG_Y_ADDR_START_VACT_H, 0x0040},
> + {HI846_REG_UNKNOWN_0028, 0x0017},
> + {HI846_REG_Y_ADDR_END_VACT_H, 0x09CF},
> + {HI846_REG_UNKNOWN_005C, 0x2101},
> + {HI846_REG_FLL, 0x09DE},
> + {HI846_REG_LLP, 0x0ED8},
> + {HI846_REG_IMAGE_ORIENTATION, 0x0100},
> + {HI846_REG_BINNING_MODE, 0x0022},
> + {HI846_REG_HBIN_MODE, 0x0000},
> + {HI846_REG_UNKNOWN_0A24, 0x0000},
> + {HI846_REG_X_START_H, 0x0000},
> + {HI846_REG_X_OUTPUT_SIZE_H, 0x0CC0},
> + {HI846_REG_Y_OUTPUT_SIZE_H, 0x0990},
> + {HI846_REG_EXPOSURE, 0x09D8},
> + {HI846_REG_ANALOG_GAIN, 0x0000},
> + {HI846_REG_GROUPED_PARA_HOLD, 0x0000},
> + {HI846_REG_UNKNOWN_051E, 0x0000},
> + {HI846_REG_UNKNOWN_0200, 0x0400},
> + {HI846_REG_PEDESTAL_EN, 0x0C00},
> + {HI846_REG_UNKNOWN_0A0C, 0x0010},
> + {HI846_REG_UNKNOWN_0A1E, 0x0CCF},
> + {HI846_REG_UNKNOWN_0402, 0x0110},
> + {HI846_REG_UNKNOWN_0404, 0x00F4},
> + {HI846_REG_UNKNOWN_0408, 0x0000},
> + {HI846_REG_UNKNOWN_0410, 0x008D},
> + {HI846_REG_UNKNOWN_0412, 0x011A},
> + {HI846_REG_UNKNOWN_0414, 0x864C},
> + {HI846_REG_UNKNOWN_021C, 0x0003},
> + {HI846_REG_UNKNOWN_021E, 0x0235},
> + {HI846_REG_BLC_CTL0, 0x9150},
> + {HI846_REG_UNKNOWN_0C06, 0x0021},
> + {HI846_REG_UNKNOWN_0C10, 0x0040},
> + {HI846_REG_UNKNOWN_0C12, 0x0040},
> + {HI846_REG_UNKNOWN_0C14, 0x0040},
> + {HI846_REG_UNKNOWN_0C16, 0x0040},
> + {HI846_REG_FAST_STANDBY_MODE, 0x0100},
> + {HI846_REG_ISP_EN_H, 0x014A},
> + {HI846_REG_UNKNOWN_0418, 0x0000},
> + {HI846_REG_UNKNOWN_012A, 0x03B4},
> + {HI846_REG_X_ADDR_START_HACT_H, 0x0046},
> + {HI846_REG_X_ADDR_END_HACT_H, 0x0376},
> + {HI846_REG_UNKNOWN_0B02, 0xE04D},
> + {HI846_REG_UNKNOWN_0B10, 0x6821},
> + {HI846_REG_UNKNOWN_0B12, 0x0120},
> + {HI846_REG_UNKNOWN_0B14, 0x0001},
> + {HI846_REG_UNKNOWN_2008, 0x38FD},
> + {HI846_REG_UNKNOWN_326E, 0x0000},
> + {HI846_REG_UNKNOWN_0900, 0x0320},
> + {HI846_REG_MIPI_TX_OP_MODE, 0xC31A},
> + {HI846_REG_UNKNOWN_0914, 0xC109},
> + {HI846_REG_TCLK_PREPARE, 0x061A},
> + {HI846_REG_UNKNOWN_0918, 0x0306},
> + {HI846_REG_THS_ZERO, 0x0B09},
> + {HI846_REG_TCLK_POST, 0x0C07},
> + {HI846_REG_UNKNOWN_091E, 0x0A00},
> + {HI846_REG_UNKNOWN_090C, 0x042A},
> + {HI846_REG_UNKNOWN_090E, 0x006B},
> + {HI846_REG_UNKNOWN_0954, 0x0089},
> + {HI846_REG_UNKNOWN_0956, 0x0000},
> + {HI846_REG_UNKNOWN_0958, 0xCA00},
> + {HI846_REG_UNKNOWN_095A, 0x9240},
> + {HI846_REG_UNKNOWN_0F08, 0x2F04},
> + {HI846_REG_UNKNOWN_0F30, 0x001F},
> + {HI846_REG_UNKNOWN_0F36, 0x001F},
> + {HI846_REG_UNKNOWN_0F04, 0x3A00},
> + {HI846_REG_PLL_CFG_RAMP1_H, 0x025A},
> + {HI846_REG_PLL_CFG_MIPI1_H, 0x025A},
> + {HI846_REG_PLL_CFG_MIPI2_H, 0x0024},
> + {HI846_REG_UNKNOWN_006A, 0x0100},
> + {HI846_REG_TG_ENABLE, 0x0100},
> +};
> +
> +static const struct hi846_reg hi846_init_4lane[] = {
> + {0x2000, 0x987A},
> + {0x2002, 0x00FF},
> + {0x2004, 0x0047},
> + {0x2006, 0x3FFF},
> + {0x2008, 0x3FFF},
> + {0x200A, 0xC216},
> + {0x200C, 0x1292},
> + {0x200E, 0xC01A},
> + {0x2010, 0x403D},
> + {0x2012, 0x000E},
> + {0x2014, 0x403E},
> + {0x2016, 0x0B80},
> + {0x2018, 0x403F},
> + {0x201A, 0x82AE},
> + {0x201C, 0x1292},
> + {0x201E, 0xC00C},
> + {0x2020, 0x4130},
> + {0x2022, 0x43E2},
> + {0x2024, 0x0180},
> + {0x2026, 0x4130},
> + {0x2028, 0x7400},
> + {0x202A, 0x5000},
> + {0x202C, 0x0253},
> + {0x202E, 0x0AD1},
> + {0x2030, 0x2360},
> + {0x2032, 0x0009},
> + {0x2034, 0x5020},
> + {0x2036, 0x000B},
> + {0x2038, 0x0002},
> + {0x203A, 0x0044},
> + {0x203C, 0x0016},
> + {0x203E, 0x1792},
> + {0x2040, 0x7002},
> + {0x2042, 0x154F},
> + {0x2044, 0x00D5},
> + {0x2046, 0x000B},
> + {0x2048, 0x0019},
> + {0x204A, 0x1698},
> + {0x204C, 0x000E},
> + {0x204E, 0x099A},
> + {0x2050, 0x0058},
> + {0x2052, 0x7000},
> + {0x2054, 0x1799},
> + {0x2056, 0x0310},
> + {0x2058, 0x03C3},
> + {0x205A, 0x004C},
> + {0x205C, 0x064A},
> + {0x205E, 0x0001},
> + {0x2060, 0x0007},
> + {0x2062, 0x0BC7},
> + {0x2064, 0x0055},
> + {0x2066, 0x7000},
> + {0x2068, 0x1550},
> + {0x206A, 0x158A},
> + {0x206C, 0x0004},
> + {0x206E, 0x1488},
> + {0x2070, 0x7010},
> + {0x2072, 0x1508},
> + {0x2074, 0x0004},
> + {0x2076, 0x0016},
> + {0x2078, 0x03D5},
> + {0x207A, 0x0055},
> + {0x207C, 0x08CA},
> + {0x207E, 0x2019},
> + {0x2080, 0x0007},
> + {0x2082, 0x7057},
> + {0x2084, 0x0FC7},
> + {0x2086, 0x5041},
> + {0x2088, 0x12C8},
> + {0x208A, 0x5060},
> + {0x208C, 0x5080},
> + {0x208E, 0x2084},
> + {0x2090, 0x12C8},
> + {0x2092, 0x7800},
> + {0x2094, 0x0802},
> + {0x2096, 0x040F},
> + {0x2098, 0x1007},
> + {0x209A, 0x0803},
> + {0x209C, 0x080B},
> + {0x209E, 0x3803},
> + {0x20A0, 0x0807},
> + {0x20A2, 0x0404},
> + {0x20A4, 0x0400},
> + {0x20A6, 0xFFFF},
> + {0x20A8, 0xF0B2},
> + {0x20AA, 0xFFEF},
> + {0x20AC, 0x0A84},
> + {0x20AE, 0x1292},
> + {0x20B0, 0xC02E},
> + {0x20B2, 0x4130},
> + {0x20B4, 0xF0B2},
> + {0x20B6, 0xFFBF},
> + {0x20B8, 0x2004},
> + {0x20BA, 0x403F},
> + {0x20BC, 0x00C3},
> + {0x20BE, 0x4FE2},
> + {0x20C0, 0x8318},
> + {0x20C2, 0x43CF},
> + {0x20C4, 0x0000},
> + {0x20C6, 0x9382},
> + {0x20C8, 0xC314},
> + {0x20CA, 0x2003},
> + {0x20CC, 0x12B0},
> + {0x20CE, 0xCAB0},
> + {0x20D0, 0x4130},
> + {0x20D2, 0x12B0},
> + {0x20D4, 0xC90A},
> + {0x20D6, 0x4130},
> + {0x20D8, 0x42D2},
> + {0x20DA, 0x8318},
> + {0x20DC, 0x00C3},
> + {0x20DE, 0x9382},
> + {0x20E0, 0xC314},
> + {0x20E2, 0x2009},
> + {0x20E4, 0x120B},
> + {0x20E6, 0x120A},
> + {0x20E8, 0x1209},
> + {0x20EA, 0x1208},
> + {0x20EC, 0x1207},
> + {0x20EE, 0x1206},
> + {0x20F0, 0x4030},
> + {0x20F2, 0xC15E},
> + {0x20F4, 0x4130},
> + {0x20F6, 0x1292},
> + {0x20F8, 0xC008},
> + {0x20FA, 0x4130},
> + {0x20FC, 0x42D2},
> + {0x20FE, 0x82A1},
> + {0x2100, 0x00C2},
> + {0x2102, 0x1292},
> + {0x2104, 0xC040},
> + {0x2106, 0x4130},
> + {0x2108, 0x1292},
> + {0x210A, 0xC006},
> + {0x210C, 0x42A2},
> + {0x210E, 0x7324},
> + {0x2110, 0x9382},
> + {0x2112, 0xC314},
> + {0x2114, 0x2011},
> + {0x2116, 0x425F},
> + {0x2118, 0x82A1},
> + {0x211A, 0xF25F},
> + {0x211C, 0x00C1},
> + {0x211E, 0xF35F},
> + {0x2120, 0x2406},
> + {0x2122, 0x425F},
> + {0x2124, 0x00C0},
> + {0x2126, 0xF37F},
> + {0x2128, 0x522F},
> + {0x212A, 0x4F82},
> + {0x212C, 0x7324},
> + {0x212E, 0x425F},
> + {0x2130, 0x82D4},
> + {0x2132, 0xF35F},
> + {0x2134, 0x4FC2},
> + {0x2136, 0x01B3},
> + {0x2138, 0x93C2},
> + {0x213A, 0x829F},
> + {0x213C, 0x2421},
> + {0x213E, 0x403E},
> + {0x2140, 0xFFFE},
> + {0x2142, 0x40B2},
> + {0x2144, 0xEC78},
> + {0x2146, 0x831C},
> + {0x2148, 0x40B2},
> + {0x214A, 0xEC78},
> + {0x214C, 0x831E},
> + {0x214E, 0x40B2},
> + {0x2150, 0xEC78},
> + {0x2152, 0x8320},
> + {0x2154, 0xB3D2},
> + {0x2156, 0x008C},
> + {0x2158, 0x2405},
> + {0x215A, 0x4E0F},
> + {0x215C, 0x503F},
> + {0x215E, 0xFFD8},
> + {0x2160, 0x4F82},
> + {0x2162, 0x831C},
> + {0x2164, 0x90F2},
> + {0x2166, 0x0003},
> + {0x2168, 0x008C},
> + {0x216A, 0x2401},
> + {0x216C, 0x4130},
> + {0x216E, 0x421F},
> + {0x2170, 0x831C},
> + {0x2172, 0x5E0F},
> + {0x2174, 0x4F82},
> + {0x2176, 0x831E},
> + {0x2178, 0x5E0F},
> + {0x217A, 0x4F82},
> + {0x217C, 0x8320},
> + {0x217E, 0x3FF6},
> + {0x2180, 0x432E},
> + {0x2182, 0x3FDF},
> + {0x2184, 0x421F},
> + {0x2186, 0x7100},
> + {0x2188, 0x4F0E},
> + {0x218A, 0x503E},
> + {0x218C, 0xFFD8},
> + {0x218E, 0x4E82},
> + {0x2190, 0x7A04},
> + {0x2192, 0x421E},
> + {0x2194, 0x831C},
> + {0x2196, 0x5F0E},
> + {0x2198, 0x4E82},
> + {0x219A, 0x7A06},
> + {0x219C, 0x0B00},
> + {0x219E, 0x7304},
> + {0x21A0, 0x0050},
> + {0x21A2, 0x40B2},
> + {0x21A4, 0xD081},
> + {0x21A6, 0x0B88},
> + {0x21A8, 0x421E},
> + {0x21AA, 0x831E},
> + {0x21AC, 0x5F0E},
> + {0x21AE, 0x4E82},
> + {0x21B0, 0x7A0E},
> + {0x21B2, 0x521F},
> + {0x21B4, 0x8320},
> + {0x21B6, 0x4F82},
> + {0x21B8, 0x7A10},
> + {0x21BA, 0x0B00},
> + {0x21BC, 0x7304},
> + {0x21BE, 0x007A},
> + {0x21C0, 0x40B2},
> + {0x21C2, 0x0081},
> + {0x21C4, 0x0B88},
> + {0x21C6, 0x4392},
> + {0x21C8, 0x7A0A},
> + {0x21CA, 0x0800},
> + {0x21CC, 0x7A0C},
> + {0x21CE, 0x0B00},
> + {0x21D0, 0x7304},
> + {0x21D2, 0x022B},
> + {0x21D4, 0x40B2},
> + {0x21D6, 0xD081},
> + {0x21D8, 0x0B88},
> + {0x21DA, 0x0B00},
> + {0x21DC, 0x7304},
> + {0x21DE, 0x0255},
> + {0x21E0, 0x40B2},
> + {0x21E2, 0x0081},
> + {0x21E4, 0x0B88},
> + {0x21E6, 0x4130},
> + {0x23FE, 0xC056},
> + {0x3232, 0xFC0C},
> + {0x3236, 0xFC22},
> + {0x3238, 0xFCFC},
> + {0x323A, 0xFD84},
> + {0x323C, 0xFD08},
> + {0x3246, 0xFCD8},
> + {0x3248, 0xFCA8},
> + {0x324E, 0xFCB4},
> + {0x326A, 0x8302},
> + {0x326C, 0x830A},
> + {0x326E, 0x0000},
> + {0x32CA, 0xFC28},
> + {0x32CC, 0xC3BC},
> + {0x32CE, 0xC34C},
> + {0x32D0, 0xC35A},
> + {0x32D2, 0xC368},
> + {0x32D4, 0xC376},
> + {0x32D6, 0xC3C2},
> + {0x32D8, 0xC3E6},
> + {0x32DA, 0x0003},
> + {0x32DC, 0x0003},
> + {0x32DE, 0x00C7},
> + {0x32E0, 0x0031},
> + {0x32E2, 0x0031},
> + {0x32E4, 0x0031},
> + {0x32E6, 0xFC28},
> + {0x32E8, 0xC3BC},
> + {0x32EA, 0xC384},
> + {0x32EC, 0xC392},
> + {0x32EE, 0xC3A0},
> + {0x32F0, 0xC3AE},
> + {0x32F2, 0xC3C4},
> + {0x32F4, 0xC3E6},
> + {0x32F6, 0x0003},
> + {0x32F8, 0x0003},
> + {0x32FA, 0x00C7},
> + {0x32FC, 0x0031},
> + {0x32FE, 0x0031},
> + {0x3300, 0x0031},
> + {0x3302, 0x82CA},
> + {0x3304, 0xC164},
> + {0x3306, 0x82E6},
> + {0x3308, 0xC19C},
> + {0x330A, 0x001F},
> + {0x330C, 0x001A},
> + {0x330E, 0x0034},
> + {0x3310, 0x0000},
> + {0x3312, 0x0000},
> + {0x3314, 0xFC94},
> + {0x3316, 0xC3D8},
> +
> + {0x0A00, 0x0000},
> + {0x0E04, 0x0012},
> + {0x002E, 0x1111},
> + {0x0032, 0x1111},
> + {0x0022, 0x0008},
> + {0x0026, 0x0040},
> + {0x0028, 0x0017},
> + {0x002C, 0x09CF},
> + {0x005C, 0x2101},
> + {0x0006, 0x09DE},
> + {0x0008, 0x0ED8},
> + {0x000E, 0x0100},
> + {0x000C, 0x0022},
> + {0x0A22, 0x0000},
> + {0x0A24, 0x0000},
> + {0x0804, 0x0000},
> + {0x0A12, 0x0CC0},
> + {0x0A14, 0x0990},
> + {0x0074, 0x09D8},
> + {0x0076, 0x0000},
> + {0x051E, 0x0000},
> + {0x0200, 0x0400},
> + {0x0A1A, 0x0C00},
> + {0x0A0C, 0x0010},
> + {0x0A1E, 0x0CCF},
> + {0x0402, 0x0110},
> + {0x0404, 0x00F4},
> + {0x0408, 0x0000},
> + {0x0410, 0x008D},
> + {0x0412, 0x011A},
> + {0x0414, 0x864C},
> + /* For OTP */
> + {0x021C, 0x0003},
> + {0x021E, 0x0235},
> + /* For OTP */
> + {0x0C00, 0x9950},
> + {0x0C06, 0x0021},
> + {0x0C10, 0x0040},
> + {0x0C12, 0x0040},
> + {0x0C14, 0x0040},
> + {0x0C16, 0x0040},
> + {0x0A02, 0x0100},
> + {0x0A04, 0x015A},
> + {0x0418, 0x0000},
> + {0x0128, 0x0028},
> + {0x012A, 0xFFFF},
> + {0x0120, 0x0046},
> + {0x0122, 0x0376},
> + {0x012C, 0x0020},
> + {0x012E, 0xFFFF},
> + {0x0124, 0x0040},
> + {0x0126, 0x0378},
> + {0x0746, 0x0050},
> + {0x0748, 0x01D5},
> + {0x074A, 0x022B},
> + {0x074C, 0x03B0},
> + {0x0756, 0x043F},
> + {0x0758, 0x3F1D},
> + {0x0B02, 0xE04D},
> + {0x0B10, 0x6821},
> + {0x0B12, 0x0120},
> + {0x0B14, 0x0001},
> + {0x2008, 0x38FD},
> + {0x326E, 0x0000},
> + {0x0900, 0x0300},
> + {0x0902, 0xC319},
> + {0x0914, 0xC109},
> + {0x0916, 0x061A},
> + {0x0918, 0x0407},
> + {0x091A, 0x0A0B},
> + {0x091C, 0x0E08},
> + {0x091E, 0x0A00},
> + {0x090C, 0x0427},
> + {0x090E, 0x0059},
> + {0x0954, 0x0089},
> + {0x0956, 0x0000},
> + {0x0958, 0xCA80},
> + {0x095A, 0x9240},
> + {0x0F08, 0x2F04},
> + {0x0F30, 0x001F},
> + {0x0F36, 0x001F},
> + {0x0F04, 0x3A00},
> + {0x0F32, 0x025A},
> + {0x0F38, 0x025A},
> + {0x0F2A, 0x4124},
> + {0x006A, 0x0100},
> + {0x004C, 0x0100},
> + {0x0044, 0x0001},
> +};
> +
> +static const struct hi846_reg mode_640x480_config[] = {
> + {HI846_REG_MODE_SELECT, 0x0000},
> + {HI846_REG_Y_ODD_INC_FOBP, 0x7711},
> + {HI846_REG_Y_ODD_INC_VACT, 0x7711},
> + {HI846_REG_Y_ADDR_START_VACT_H, 0x0148},
> + {HI846_REG_Y_ADDR_END_VACT_H, 0x08C7},
> + {HI846_REG_UNKNOWN_005C, 0x4404},
> + {HI846_REG_FLL, 0x0277},
> + {HI846_REG_LLP, 0x0ED8},
> + {HI846_REG_BINNING_MODE, 0x0322},
> + {HI846_REG_HBIN_MODE, 0x0200},
> + {HI846_REG_UNKNOWN_0A24, 0x0000},
> + {HI846_REG_X_START_H, 0x0058},
> + {HI846_REG_X_OUTPUT_SIZE_H, 0x0280},
> + {HI846_REG_Y_OUTPUT_SIZE_H, 0x01E0},
> +
> + /* For OTP */
> + {HI846_REG_UNKNOWN_021C, 0x0003},
> + {HI846_REG_UNKNOWN_021E, 0x0235},
> +
> + {HI846_REG_ISP_EN_H, 0x017A},
> + {HI846_REG_UNKNOWN_0418, 0x0210},
> + {HI846_REG_UNKNOWN_0B02, 0xE04D},
> + {HI846_REG_UNKNOWN_0B10, 0x7021},
> + {HI846_REG_UNKNOWN_0B12, 0x0120},
> + {HI846_REG_UNKNOWN_0B14, 0x0001},
> + {HI846_REG_UNKNOWN_2008, 0x38FD},
> + {HI846_REG_UNKNOWN_326E, 0x0000},
> +};
> +
> +static const struct hi846_reg mode_640x480_mipi_2lane[] = {
> + {HI846_REG_UNKNOWN_0900, 0x0300},
> + {HI846_REG_MIPI_TX_OP_MODE, 0x4319},
> + {HI846_REG_UNKNOWN_0914, 0xC105},
> + {HI846_REG_TCLK_PREPARE, 0x030C},
> + {HI846_REG_UNKNOWN_0918, 0x0304},
> + {HI846_REG_THS_ZERO, 0x0708},
> + {HI846_REG_TCLK_POST, 0x0B04},
> + {HI846_REG_UNKNOWN_091E, 0x0500},
> + {HI846_REG_UNKNOWN_090C, 0x0208},
> + {HI846_REG_UNKNOWN_090E, 0x009A},
> + {HI846_REG_UNKNOWN_0954, 0x0089},
> + {HI846_REG_UNKNOWN_0956, 0x0000},
> + {HI846_REG_UNKNOWN_0958, 0xCA80},
> + {HI846_REG_UNKNOWN_095A, 0x9240},
> + {HI846_REG_PLL_CFG_MIPI2_H, 0x4924},
> + {HI846_REG_TG_ENABLE, 0x0100},
> +};
> +
> +static const struct hi846_reg mode_1280x720_config[] = {
> + {HI846_REG_MODE_SELECT, 0x0000},
> + {HI846_REG_Y_ODD_INC_FOBP, 0x3311},
> + {HI846_REG_Y_ODD_INC_VACT, 0x3311},
> + {HI846_REG_Y_ADDR_START_VACT_H, 0x0238},
> + {HI846_REG_Y_ADDR_END_VACT_H, 0x07D7},
> + {HI846_REG_UNKNOWN_005C, 0x4202},
> + {HI846_REG_FLL, 0x034A},
> + {HI846_REG_LLP, 0x0ED8},
> + {HI846_REG_BINNING_MODE, 0x0122},
> + {HI846_REG_HBIN_MODE, 0x0100},
> + {HI846_REG_UNKNOWN_0A24, 0x0000},
> + {HI846_REG_X_START_H, 0x00B0},
> + {HI846_REG_X_OUTPUT_SIZE_H, 0x0500},
> + {HI846_REG_Y_OUTPUT_SIZE_H, 0x02D0},
> + {HI846_REG_EXPOSURE, 0x0344},
> +
> + /* For OTP */
> + {HI846_REG_UNKNOWN_021C, 0x0003},
> + {HI846_REG_UNKNOWN_021E, 0x0235},
> +
> + {HI846_REG_ISP_EN_H, 0x017A},
> + {HI846_REG_UNKNOWN_0418, 0x0410},
> + {HI846_REG_UNKNOWN_0B02, 0xE04D},
> + {HI846_REG_UNKNOWN_0B10, 0x6C21},
> + {HI846_REG_UNKNOWN_0B12, 0x0120},
> + {HI846_REG_UNKNOWN_0B14, 0x0005},
> + {HI846_REG_UNKNOWN_2008, 0x38FD},
> + {HI846_REG_UNKNOWN_326E, 0x0000},
> +};
> +
> +static const struct hi846_reg mode_1280x720_mipi_2lane[] = {
> + {HI846_REG_UNKNOWN_0900, 0x0300},
> + {HI846_REG_MIPI_TX_OP_MODE, 0x4319},
> + {HI846_REG_UNKNOWN_0914, 0xC109},
> + {HI846_REG_TCLK_PREPARE, 0x061A},
> + {HI846_REG_UNKNOWN_0918, 0x0407},
> + {HI846_REG_THS_ZERO, 0x0A0B},
> + {HI846_REG_TCLK_POST, 0x0E08},
> + {HI846_REG_UNKNOWN_091E, 0x0A00},
> + {HI846_REG_UNKNOWN_090C, 0x0427},
> + {HI846_REG_UNKNOWN_090E, 0x0145},
> + {HI846_REG_UNKNOWN_0954, 0x0089},
> + {HI846_REG_UNKNOWN_0956, 0x0000},
> + {HI846_REG_UNKNOWN_0958, 0xCA80},
> + {HI846_REG_UNKNOWN_095A, 0x9240},
> + {HI846_REG_PLL_CFG_MIPI2_H, 0x4124},
> + {HI846_REG_TG_ENABLE, 0x0100},
> +};
> +
> +static const struct hi846_reg mode_1280x720_mipi_4lane[] = {
> + /* 360Mbps */
> + {HI846_REG_UNKNOWN_0900, 0x0300},
> + {HI846_REG_MIPI_TX_OP_MODE, 0xC319},
> + {HI846_REG_UNKNOWN_0914, 0xC105},
> + {HI846_REG_TCLK_PREPARE, 0x030C},
> + {HI846_REG_UNKNOWN_0918, 0x0304},
> + {HI846_REG_THS_ZERO, 0x0708},
> + {HI846_REG_TCLK_POST, 0x0B04},
> + {HI846_REG_UNKNOWN_091E, 0x0500},
> + {HI846_REG_UNKNOWN_090C, 0x0208},
> + {HI846_REG_UNKNOWN_090E, 0x008A},
> + {HI846_REG_UNKNOWN_0954, 0x0089},
> + {HI846_REG_UNKNOWN_0956, 0x0000},
> + {HI846_REG_UNKNOWN_0958, 0xCA80},
> + {HI846_REG_UNKNOWN_095A, 0x9240},
> + {HI846_REG_PLL_CFG_MIPI2_H, 0x4924},
> + {HI846_REG_TG_ENABLE, 0x0100},
> +};
> +
> +static const struct hi846_reg mode_1632x1224_config[] = {
> + {HI846_REG_MODE_SELECT, 0x0000},
> + {HI846_REG_Y_ODD_INC_FOBP, 0x3311},
> + {HI846_REG_Y_ODD_INC_VACT, 0x3311},
> + {HI846_REG_Y_ADDR_START_VACT_H, 0x0040},
> + {HI846_REG_Y_ADDR_END_VACT_H, 0x09CF},
> + {HI846_REG_UNKNOWN_005C, 0x4202},
> + {HI846_REG_FLL, 0x09DE},
> + {HI846_REG_LLP, 0x0ED8},
> + {HI846_REG_BINNING_MODE, 0x0122},
> + {HI846_REG_HBIN_MODE, 0x0100},
> + {HI846_REG_UNKNOWN_0A24, 0x0000},
> + {HI846_REG_X_START_H, 0x0000},
> + {HI846_REG_X_OUTPUT_SIZE_H, 0x0660},
> + {HI846_REG_Y_OUTPUT_SIZE_H, 0x04C8},
> + {HI846_REG_EXPOSURE, 0x09D8},
> + {HI846_REG_ISP_EN_H, 0x017A},
> +
> + /* For OTP */
> + {HI846_REG_UNKNOWN_021C, 0x0003},
> + {HI846_REG_UNKNOWN_021E, 0x0235},
> +
> + {HI846_REG_UNKNOWN_0418, 0x0000},
> + {HI846_REG_UNKNOWN_0B02, 0xE04D},
> + {HI846_REG_UNKNOWN_0B10, 0x6C21},
> + {HI846_REG_UNKNOWN_0B12, 0x0120},
> + {HI846_REG_UNKNOWN_0B14, 0x0005},
> + {HI846_REG_UNKNOWN_2008, 0x38FD},
> + {HI846_REG_UNKNOWN_326E, 0x0000},
> +};
> +
> +static const struct hi846_reg mode_1632x1224_mipi_2lane[] = {
> + {HI846_REG_UNKNOWN_0900, 0x0300},
> + {HI846_REG_MIPI_TX_OP_MODE, 0x4319},
> + {HI846_REG_UNKNOWN_0914, 0xC109},
> + {HI846_REG_TCLK_PREPARE, 0x061A},
> + {HI846_REG_UNKNOWN_0918, 0x0407},
> + {HI846_REG_THS_ZERO, 0x0A0B},
> + {HI846_REG_TCLK_POST, 0x0E08},
> + {HI846_REG_UNKNOWN_091E, 0x0A00},
> + {HI846_REG_UNKNOWN_090C, 0x0427},
> + {HI846_REG_UNKNOWN_090E, 0x0069},
> + {HI846_REG_UNKNOWN_0954, 0x0089},
> + {HI846_REG_UNKNOWN_0956, 0x0000},
> + {HI846_REG_UNKNOWN_0958, 0xCA80},
> + {HI846_REG_UNKNOWN_095A, 0x9240},
> + {HI846_REG_PLL_CFG_MIPI2_H, 0x4124},
> + {HI846_REG_TG_ENABLE, 0x0100},
> +};
> +
> +static const struct hi846_reg mode_1632x1224_mipi_4lane[] = {
> + {HI846_REG_UNKNOWN_0900, 0x0300},
> + {HI846_REG_MIPI_TX_OP_MODE, 0xC319},
> + {HI846_REG_UNKNOWN_0914, 0xC105},
> + {HI846_REG_TCLK_PREPARE, 0x030C},
> + {HI846_REG_UNKNOWN_0918, 0x0304},
> + {HI846_REG_THS_ZERO, 0x0708},
> + {HI846_REG_TCLK_POST, 0x0B04},
> + {HI846_REG_UNKNOWN_091E, 0x0500},
> + {HI846_REG_UNKNOWN_090C, 0x0208},
> + {HI846_REG_UNKNOWN_090E, 0x001C},
> + {HI846_REG_UNKNOWN_0954, 0x0089},
> + {HI846_REG_UNKNOWN_0956, 0x0000},
> + {HI846_REG_UNKNOWN_0958, 0xCA80},
> + {HI846_REG_UNKNOWN_095A, 0x9240},
> + {HI846_REG_PLL_CFG_MIPI2_H, 0x4924},
> + {HI846_REG_TG_ENABLE, 0x0100},
> +};
> +
> +static const char * const hi846_test_pattern_menu[] = {
> + "Disabled",
> + "Solid Colour",
> + "100% Colour Bars",
> + "Fade To Grey Colour Bars",
> + "PN9",
> + "Gradient Horizontal",
> + "Gradient Vertical",
> + "Check Board",
> + "Slant Pattern",
> + "Resolution Pattern",
> +};
> +
> +#define FREQ_INDEX_640 0
> +#define FREQ_INDEX_1280 1
> +static const s64 hi846_link_freqs[] = {
> + [FREQ_INDEX_640] = 80000000,
> + [FREQ_INDEX_1280] = 200000000,
> +};
> +
> +static const struct hi846_reg_list hi846_init_regs_list_2lane = {
> + .num_of_regs = ARRAY_SIZE(hi846_init_2lane),
> + .regs = hi846_init_2lane,
> +};
> +
> +static const struct hi846_reg_list hi846_init_regs_list_4lane = {
> + .num_of_regs = ARRAY_SIZE(hi846_init_4lane),
> + .regs = hi846_init_4lane,
> +};
> +
> +static const struct hi846_mode supported_modes[] = {
> + {
> + .width = 640,
> + .height = 480,
> + .link_freq_index = FREQ_INDEX_640,
> + .fps = 120,
> + .frame_len = 631,
> + .llp = HI846_LINE_LENGTH,
> + .reg_list_config = {
> + .num_of_regs = ARRAY_SIZE(mode_640x480_config),
> + .regs = mode_640x480_config,
> + },
> + .reg_list_2lane = {
> + .num_of_regs = ARRAY_SIZE(mode_640x480_mipi_2lane),
> + .regs = mode_640x480_mipi_2lane,
> + },
> + },
> + {
> + .width = 1280,
> + .height = 720,
> + .link_freq_index = FREQ_INDEX_1280,
> + .fps = 90,
> + .frame_len = 842,
> + .llp = HI846_LINE_LENGTH,
> + .reg_list_config = {
> + .num_of_regs = ARRAY_SIZE(mode_1280x720_config),
> + .regs = mode_1280x720_config,
> + },
> + .reg_list_2lane = {
> + .num_of_regs = ARRAY_SIZE(mode_1280x720_mipi_2lane),
> + .regs = mode_1280x720_mipi_2lane,
> + },
> + .reg_list_4lane = {
> + .num_of_regs = ARRAY_SIZE(mode_1280x720_mipi_4lane),
> + .regs = mode_1280x720_mipi_4lane,
> + },
> + },
> + {
> + .width = 1632,
> + .height = 1224,
> + .link_freq_index = FREQ_INDEX_1280,
> + .fps = 30,
> + .frame_len = 2526,
> + .llp = HI846_LINE_LENGTH,
> + .reg_list_config = {
> + .num_of_regs = ARRAY_SIZE(mode_1632x1224_config),
> + .regs = mode_1632x1224_config,
> + },
> + .reg_list_2lane = {
> + .num_of_regs = ARRAY_SIZE(mode_1632x1224_mipi_2lane),
> + .regs = mode_1632x1224_mipi_2lane,
> + },
> + .reg_list_4lane = {
> + .num_of_regs = ARRAY_SIZE(mode_1632x1224_mipi_4lane),
> + .regs = mode_1632x1224_mipi_4lane,
> + },
> + }
> +};
> +
> +struct hi846_gpio {
> + int gpio;
> + int level;
> +};

Please use the gpiod_* API, it will handle the level automatically for
you.

> +
> +struct hi846_datafmt {
> + u32 code;
> + enum v4l2_colorspace colorspace;
> +};
> +
> +struct hi846 {
> + struct hi846_gpio rst_gpio;
> + struct regulator *vdd1_regulator;
> + struct regulator *vdd_regulator;
> + struct clk *clock;
> + struct hi846_datafmt *fmt;
> + struct v4l2_subdev sd;
> + struct media_pad pad;
> + struct v4l2_ctrl_handler ctrl_handler;
> + u8 nr_lanes;
> +
> + struct v4l2_ctrl *link_freq;
> + struct v4l2_ctrl *pixel_rate;
> + struct v4l2_ctrl *vblank;
> + struct v4l2_ctrl *hblank;
> + struct v4l2_ctrl *exposure;
> +
> + const struct hi846_mode *cur_mode;
> + struct mutex mutex;
> + bool streaming;
> +};
> +
> +static struct hi846_datafmt hi846_colour_fmts[] = {

This should be const.

> + {HI846_MEDIA_BUS_FORMAT, V4L2_COLORSPACE_RAW},

We usually add a space after { and before }.

> +};
> +
> +static struct hi846_datafmt *hi846_find_datafmt(u32 code)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(hi846_colour_fmts); i++)
> + if (hi846_colour_fmts[i].code == code)
> + return hi846_colour_fmts + i;

return &hi846_colour_fmts[i];

would be more customary. There are other similar constructs below.

> +
> + return NULL;
> +}
> +
> +static inline u8 hi846_get_link_freq_index(struct hi846 *hi846)
> +{
> + return hi846->cur_mode->link_freq_index;
> +}
> +
> +static s64 hi846_get_link_freq(struct hi846 *hi846)
> +{
> + u8 index = hi846_get_link_freq_index(hi846);
> +
> + return *(hi846_link_freqs + index);

Here for instance.

> +}
> +
> +static u64 hi846_calc_pixel_rate(struct hi846 *hi846)
> +{
> + s64 link_freq = hi846_get_link_freq(hi846);
> + u64 pixel_rate = link_freq * 2 * hi846->nr_lanes;
> +
> + do_div(pixel_rate, HI846_RGB_DEPTH);
> +
> + return pixel_rate;
> +}
> +
> +static int hi846_read_reg(struct hi846 *hi846, u16 reg, u8 *val)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&hi846->sd);
> + struct i2c_msg msgs[2];
> + u8 addr_buf[2];
> + u8 data_buf[1] = {0};
> + int ret;
> +
> + 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 = 1;
> + msgs[1].buf = &data_buf[0];
> +
> + ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
> + if (ret != ARRAY_SIZE(msgs)) {
> + dev_err(&client->dev, "i2c read error: %d\n", ret);
> + return -EIO;
> + }
> +
> + *val = data_buf[0];
> +
> + return 0;
> +}
> +
> +static int hi846_write_reg_16(struct hi846 *hi846, u16 reg, u16 val)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&hi846->sd);
> + u8 buf[6];
> +
> + put_unaligned_be16(reg, buf);
> + put_unaligned_be32(val << 8 * 2, buf + 2);
> + if (i2c_master_send(client, buf, 4) != 4)
> + return -EIO;
> +
> + return 0;
> +}
> +
> +static int hi846_write_reg_list(struct hi846 *hi846,
> + const struct hi846_reg_list *r_list)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&hi846->sd);
> + unsigned int i;
> + int ret;
> +
> + for (i = 0; i < r_list->num_of_regs; i++) {
> + ret = hi846_write_reg_16(hi846, r_list->regs[i].address,
> + 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 hi846_write_reg(struct hi846 *hi846, u16 reg, u8 val)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&hi846->sd);
> + u8 buf[3] = { reg >> 8, reg & 0xff, val };
> + int ret;
> +
> + struct i2c_msg msg[] = {
> + { .addr = client->addr, .flags = 0,
> + .len = ARRAY_SIZE(buf), .buf = buf },
> + };
> +
> + ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
> + if (ret != ARRAY_SIZE(msg)) {
> + dev_err(&client->dev, "i2c write error\n");
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> +static int hi846_update_digital_gain(struct hi846 *hi846, u16 d_gain)
> +{
> + int ret;
> +
> + ret = hi846_write_reg_16(hi846, HI846_REG_MWB_GR_GAIN_H, d_gain);
> + if (ret)
> + return ret;

Let's simplify error checks by passing an error status pointer to the
write function. You can see how that can be implemented at
https://git.linuxtv.org/pinchartl/media.git/tree/drivers/media/i2c/mt9m114.c?h=mt9m114&id=73181111a72ec7171b5c4f84ff3f304ad9a591e6#n681.
The code in this function would then become

int ret = 0;

hi846_write_reg_16(hi846, HI846_REG_MWB_GR_GAIN_H, d_gain, &ret);
hi846_write_reg_16(hi846, HI846_REG_MWB_GB_GAIN_H, d_gain, &ret);
hi846_write_reg_16(hi846, HI846_REG_MWB_R_GAIN_H, d_gain, &ret);
hi846_write_reg_16(hi846, HI846_REG_MWB_B_GAIN_H, d_gain, &ret);

return ret;

I'd also recommend, given that you have a mix of 8-bit and 16-bit
registers, to use the same mechanism as in the mt9m114 driver to
simplify writes, with the register macro encoding both the address and
the size.

> +
> + ret = hi846_write_reg_16(hi846, HI846_REG_MWB_GB_GAIN_H, d_gain);
> + if (ret)
> + return ret;
> +
> + ret = hi846_write_reg_16(hi846, HI846_REG_MWB_R_GAIN_H, d_gain);
> + if (ret)
> + return ret;
> +
> + return hi846_write_reg_16(hi846, HI846_REG_MWB_B_GAIN_H, d_gain);
> +}
> +
> +static int hi846_test_pattern(struct hi846 *hi846, u32 pattern)
> +{
> + int ret;
> + u8 val;
> +
> + if (pattern) {
> + ret = hi846_read_reg(hi846, HI846_REG_ISP, &val);
> + if (ret)
> + return ret;
> +
> + ret = hi846_write_reg(hi846, HI846_REG_ISP,
> + val | HI846_REG_ISP_TPG_EN);
> + if (ret)
> + return ret;
> + }
> +
> + return hi846_write_reg(hi846, HI846_REG_TEST_PATTERN, pattern);
> +}
> +
> +static int hi846_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct hi846 *hi846 = container_of(ctrl->handler,
> + struct hi846, ctrl_handler);
> + struct i2c_client *client = v4l2_get_subdevdata(&hi846->sd);
> + s64 exposure_max;
> + int ret = 0;
> + u32 shutter, frame_len;
> +
> + if (!pm_runtime_get_if_in_use(&client->dev))
> + goto out;
> +
> + /* Propagate change of current control to all related controls */
> + if (ctrl->id == V4L2_CID_VBLANK) {
> + /* Update max exposure while meeting expected vblanking */
> + exposure_max = hi846->cur_mode->height + ctrl->val -
> + HI846_EXPOSURE_MAX_MARGIN;
> + __v4l2_ctrl_modify_range(hi846->exposure,
> + hi846->exposure->minimum,
> + exposure_max, hi846->exposure->step,
> + exposure_max);
> + }
> +
> + switch (ctrl->id) {
> + case V4L2_CID_ANALOGUE_GAIN:
> + ret = hi846_write_reg(hi846, HI846_REG_ANALOG_GAIN, ctrl->val);
> + break;
> +
> + case V4L2_CID_DIGITAL_GAIN:
> + ret = hi846_update_digital_gain(hi846, ctrl->val);
> + break;
> +
> + case V4L2_CID_EXPOSURE:
> + shutter = ctrl->val;
> + frame_len = hi846->cur_mode->frame_len;
> +
> + if (shutter > frame_len - 6) { /* margin */
> + frame_len = shutter + 6;
> + if (frame_len > 0xffff) { /* max frame len */
> + frame_len = 0xffff;
> + }
> + }
> +
> + if (shutter < 6)
> + shutter = 6;
> + if (shutter > (0xffff - 6))
> + shutter = 0xffff - 6;
> +
> + ret = hi846_write_reg_16(hi846, HI846_REG_FLL,
> + frame_len);
> + ret = hi846_write_reg_16(hi846, HI846_REG_EXPOSURE,
> + shutter);
> + break;
> +
> + case V4L2_CID_VBLANK:
> + /* Update FLL that meets expected vertical blanking */
> + ret = hi846_write_reg_16(hi846, HI846_REG_FLL,
> + hi846->cur_mode->height + ctrl->val);
> + break;
> + case V4L2_CID_TEST_PATTERN:
> + ret = hi846_test_pattern(hi846, ctrl->val);
> + break;
> +
> + default:
> + ret = -EINVAL;
> + break;
> + }
> +
> + pm_runtime_put(&client->dev);
> +out:
> + return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops hi846_ctrl_ops = {
> + .s_ctrl = hi846_set_ctrl,
> +};
> +
> +static int hi846_init_controls(struct hi846 *hi846)
> +{
> + struct v4l2_ctrl_handler *ctrl_hdlr;
> + s64 exposure_max, h_blank;
> + int ret;
> + struct i2c_client *client = v4l2_get_subdevdata(&hi846->sd);
> +
> + ctrl_hdlr = &hi846->ctrl_handler;
> + ret = v4l2_ctrl_handler_init(ctrl_hdlr, 8);
> + if (ret)
> + return ret;
> +
> + ctrl_hdlr->lock = &hi846->mutex;
> +
> + hi846->link_freq = v4l2_ctrl_new_int_menu(ctrl_hdlr, &hi846_ctrl_ops,
> + V4L2_CID_LINK_FREQ,
> + ARRAY_SIZE(hi846_link_freqs) - 1,
> + 0, hi846_link_freqs);
> + if (hi846->link_freq)
> + hi846->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> + hi846->pixel_rate = v4l2_ctrl_new_std
> + (ctrl_hdlr, &hi846_ctrl_ops,
> + V4L2_CID_PIXEL_RATE, 0,
> + hi846_calc_pixel_rate(hi846),
> + 1,
> + hi846_calc_pixel_rate(hi846));
> + hi846->vblank = v4l2_ctrl_new_std(ctrl_hdlr, &hi846_ctrl_ops,
> + V4L2_CID_VBLANK,
> + hi846->cur_mode->frame_len -
> + hi846->cur_mode->height,
> + HI846_FLL_MAX -
> + hi846->cur_mode->height, 1,
> + hi846->cur_mode->frame_len -
> + hi846->cur_mode->height);
> +
> + h_blank = hi846->cur_mode->llp - hi846->cur_mode->width;
> +
> + hi846->hblank = v4l2_ctrl_new_std(ctrl_hdlr, &hi846_ctrl_ops,
> + V4L2_CID_HBLANK, h_blank, h_blank, 1,
> + h_blank);
> + if (hi846->hblank)
> + hi846->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
> +
> + v4l2_ctrl_new_std(ctrl_hdlr, &hi846_ctrl_ops, V4L2_CID_ANALOGUE_GAIN,
> + HI846_ANAL_GAIN_MIN, HI846_ANAL_GAIN_MAX,
> + HI846_ANAL_GAIN_STEP, HI846_ANAL_GAIN_MIN);
> + v4l2_ctrl_new_std(ctrl_hdlr, &hi846_ctrl_ops, V4L2_CID_DIGITAL_GAIN,
> + HI846_DGTL_GAIN_MIN, HI846_DGTL_GAIN_MAX,
> + HI846_DGTL_GAIN_STEP, HI846_DGTL_GAIN_DEFAULT);
> + exposure_max = hi846->cur_mode->frame_len - HI846_EXPOSURE_MAX_MARGIN;
> + hi846->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &hi846_ctrl_ops,
> + V4L2_CID_EXPOSURE,
> + HI846_EXPOSURE_MIN, exposure_max,
> + HI846_EXPOSURE_STEP,
> + exposure_max);
> + v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &hi846_ctrl_ops,
> + V4L2_CID_TEST_PATTERN,
> + ARRAY_SIZE(hi846_test_pattern_menu) - 1,
> + 0, 0, hi846_test_pattern_menu);
> + if (ctrl_hdlr->error) {
> + dev_err(&client->dev, "v4l ctrl handler error: %d\n",
> + ctrl_hdlr->error);
> + return ctrl_hdlr->error;
> + }
> +
> + hi846->sd.ctrl_handler = ctrl_hdlr;
> +
> + return 0;
> +}
> +
> +static int hi846_set_video_mode(struct hi846 *hi846, int fps)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&hi846->sd);
> + int frame_length;
> + int ret;
> + int dummy_lines;
> + s64 link_freq = hi846_get_link_freq(hi846);
> +
> + dev_dbg(&client->dev, "%s: link freq: %lld\n", __func__,
> + hi846_get_link_freq(hi846));
> +
> + frame_length = do_div(link_freq, do_div(fps, HI846_LINE_LENGTH));
> + dummy_lines = (frame_length > hi846->cur_mode->frame_len) ?
> + (frame_length - hi846->cur_mode->frame_len) : 0;
> +
> + frame_length = hi846->cur_mode->frame_len + dummy_lines;
> +
> + dev_dbg(&client->dev, "%s: frame length calculated: %d\n", __func__,
> + frame_length);
> +
> + ret = hi846_write_reg_16(hi846, HI846_REG_FLL, frame_length & 0xFFFF);
> + ret = hi846_write_reg_16(hi846, HI846_REG_LLP, HI846_LINE_LENGTH & 0xFFFF);
> +
> + return ret;
> +}
> +
> +static int hi846_start_streaming(struct hi846 *hi846)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&hi846->sd);
> + int ret = 0;
> + u8 val;
> +
> + if (hi846->nr_lanes == 2)
> + ret = hi846_write_reg_list(hi846, &hi846_init_regs_list_2lane);
> + else
> + ret = hi846_write_reg_list(hi846, &hi846_init_regs_list_4lane);
> + if (ret) {
> + dev_err(&client->dev, "failed to set plls: %d\n", ret);
> + return ret;
> + }
> +
> + ret = hi846_write_reg_list(hi846, &hi846->cur_mode->reg_list_config);
> + if (ret) {
> + dev_err(&client->dev, "failed to set mode: %d\n", ret);
> + return ret;
> + }
> +
> + if (hi846->nr_lanes == 2) {
> + if (!&hi846->cur_mode->reg_list_2lane) {
> + dev_err(&client->dev, "2 lanes unsupported for this mode\n");
> + return -EINVAL;
> + }
> + ret = hi846_write_reg_list(hi846, &hi846->cur_mode->reg_list_2lane);
> + } else {
> + if (!&hi846->cur_mode->reg_list_4lane) {
> + dev_err(&client->dev, "4 lanes unsupported for this mode\n");
> + return -EINVAL;
> + }
> + ret = hi846_write_reg_list(hi846, &hi846->cur_mode->reg_list_4lane);
> + }
> + if (ret) {
> + dev_err(&client->dev, "failed to set mipi mode: %d\n", ret);
> + return ret;
> + }
> +
> + hi846_set_video_mode(hi846, hi846->cur_mode->fps);
> +
> + ret = __v4l2_ctrl_handler_setup(hi846->sd.ctrl_handler);
> + if (ret)
> + return ret;
> +
> + /*
> + * Reading 0x0034 is purely done for debugging reasons: It is not
> + * documented in the DS but only mentioned once:
> + * "If 0x0034[2] bit is disabled , Visible pixel width and height is 0."
> + * So even though that sounds like we won't see anything, we don't
> + * know more about this, so in that case only inform the user but do
> + * nothing more.
> + */
> + ret = hi846_read_reg(hi846, 0x0034, &val);
> + if (ret)
> + return ret;
> + if (!(val & BIT(2)))
> + dev_info(&client->dev, "visible pixel width and height is 0\n");
> +
> + ret = hi846_write_reg(hi846, HI846_REG_MODE_SELECT,
> + HI846_MODE_STREAMING);
> + if (ret) {
> + dev_err(&client->dev, "failed to start stream");
> + return ret;
> + }
> +
> + hi846->streaming = 1;
> +
> + dev_dbg(&client->dev, "%s: started streaming successfully\n", __func__);
> +
> + return ret;
> +}
> +
> +static void hi846_stop_streaming(struct hi846 *hi846)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&hi846->sd);
> +
> + if (hi846_write_reg(hi846, HI846_REG_MODE_SELECT, HI846_MODE_STANDBY))
> + dev_err(&client->dev, "failed to stop stream");
> +
> + hi846->streaming = 0;
> +}
> +
> +static int hi846_set_stream(struct v4l2_subdev *sd, int enable)
> +{
> + struct hi846 *hi846 = to_hi846(sd);
> + struct i2c_client *client = v4l2_get_subdevdata(sd);
> + int ret = 0;
> +
> + if (hi846->streaming == enable)
> + return 0;
> +
> + mutex_lock(&hi846->mutex);
> +
> + if (enable) {
> + ret = pm_runtime_get_sync(&client->dev);
> + if (ret < 0) {
> + pm_runtime_put_noidle(&client->dev);
> + goto out;
> + }
> +
> + ret = hi846_start_streaming(hi846);
> + if (ret) {
> + enable = 0;
> + hi846_stop_streaming(hi846);
> + pm_runtime_put(&client->dev);
> + }
> + } else {
> + hi846_stop_streaming(hi846);
> + pm_runtime_put(&client->dev);
> + }
> +
> +out:
> + mutex_unlock(&hi846->mutex);
> +
> + return ret;
> +}
> +
> +static int hi846_regulator_enable(struct hi846 *hi846)
> +{
> + int ret = 0;
> +
> + ret = regulator_enable(hi846->vdd_regulator);
> + if (ret)
> + return ret;
> +
> + return regulator_enable(hi846->vdd1_regulator);

If this fails, vdd should be disabled. You can use the bulk regulator
API to handle this.

> +}
> +
> +static void hi846_regulator_disable(struct hi846 *hi846)
> +{
> + if (regulator_is_enabled(hi846->vdd1_regulator))
> + regulator_disable(hi846->vdd1_regulator);

Regulator enable/disable calls always need to be balanced, checking if
the regulator is enabled before disabling it is most often not correct.

> +
> + if (regulator_is_enabled(hi846->vdd_regulator))
> + regulator_disable(hi846->vdd_regulator);
> +}
> +
> +static int __maybe_unused hi846_suspend(struct device *dev)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct v4l2_subdev *sd = i2c_get_clientdata(client);
> + struct hi846 *hi846 = to_hi846(sd);
> +
> + if (hi846->streaming)
> + hi846_stop_streaming(hi846);
> +
> + if (!IS_ERR(hi846->clock))

Can this happen ?

> + clk_disable_unprepare(hi846->clock);
> +
> + hi846_regulator_disable(hi846);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused hi846_resume(struct device *dev)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct v4l2_subdev *sd = i2c_get_clientdata(client);
> + struct hi846 *hi846 = to_hi846(sd);
> + int ret;
> +
> + ret = hi846_regulator_enable(hi846);
> + if (ret) {
> + dev_err(dev, "enable regulator failed: %d\n", ret);
> + return ret;
> + }
> +
> + ret = clk_prepare_enable(hi846->clock);
> + if (ret < 0) {
> + dev_err(dev, "enable clk failed: %d\n", ret);
> + goto error_regulator;
> + }
> +
> + msleep(100);
> +
> + if (hi846->streaming) {
> + ret = hi846_start_streaming(hi846);
> + if (ret) {
> + dev_err(dev, "%s: start streaming failed: %d\n",
> + __func__, ret);
> + goto error;
> + }
> + }
> +
> + return 0;
> +
> +error:
> + clk_disable_unprepare(hi846->clock);
> +
> +error_regulator:
> + hi846_regulator_disable(hi846);
> +
> + return ret;
> +}
> +
> +static int hi846_set_format(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_format *format)
> +{
> + struct hi846 *hi846 = to_hi846(sd);
> + struct v4l2_mbus_framefmt *mf = &format->format;
> + struct i2c_client *client = v4l2_get_subdevdata(sd);
> + struct hi846_datafmt *fmt = hi846_find_datafmt(mf->code);
> + u32 tgt_fps;
> + s32 vblank_def, h_blank;
> +
> + if (!fmt) {
> + mf->code = hi846_colour_fmts[0].code;
> + mf->colorspace = hi846_colour_fmts[0].colorspace;
> + fmt = &hi846_colour_fmts[0];
> + }
> +
> + if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
> + *v4l2_subdev_get_try_format(sd, cfg, format->pad) = *mf;
> + return 0;
> + }
> +
> + mutex_lock(&hi846->mutex);
> +
> + if (hi846->streaming) {
> + mutex_unlock(&hi846->mutex);
> + return -EBUSY;
> + }
> +
> + hi846->fmt = fmt;
> +
> + hi846->cur_mode = v4l2_find_nearest_size(supported_modes,
> + ARRAY_SIZE(supported_modes), width,
> + height, mf->width,
> + mf->height);
> + dev_dbg(&client->dev, "%s: found mode: %dx%d\n", __func__,
> + hi846->cur_mode->width, hi846->cur_mode->height);
> +
> + tgt_fps = hi846->cur_mode->fps;
> + dev_dbg(&client->dev, "%s: target fps: %d\n", __func__, tgt_fps);
> +
> + mf->width = hi846->cur_mode->width;
> + mf->height = hi846->cur_mode->height;
> + mf->code = HI846_MEDIA_BUS_FORMAT;
> + mf->field = V4L2_FIELD_NONE;
> +
> + __v4l2_ctrl_s_ctrl(hi846->link_freq, hi846_get_link_freq_index(hi846));
> + __v4l2_ctrl_s_ctrl_int64(hi846->pixel_rate,
> + hi846_calc_pixel_rate(hi846));
> +
> + /* Update limits and set FPS to default */
> + vblank_def = hi846->cur_mode->frame_len - hi846->cur_mode->height;
> + __v4l2_ctrl_modify_range(hi846->vblank,
> + hi846->cur_mode->frame_len - hi846->cur_mode->height,
> + HI846_FLL_MAX - hi846->cur_mode->height, 1,
> + vblank_def);
> + __v4l2_ctrl_s_ctrl(hi846->vblank, vblank_def);
> +
> + h_blank = hi846->cur_mode->llp - hi846->cur_mode->width;
> +
> + __v4l2_ctrl_modify_range(hi846->hblank, h_blank, h_blank, 1,
> + h_blank);
> +
> + dev_dbg(&client->dev, "Set fmt w=%d h=%d code=0x%x colorspace=0x%x\n",
> + mf->width, mf->height,
> + fmt->code, fmt->colorspace);
> +
> + mutex_unlock(&hi846->mutex);
> +
> + return 0;
> +}
> +
> +static int hi846_get_format(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_format *format)
> +{
> + struct hi846 *hi846 = to_hi846(sd);
> + struct v4l2_mbus_framefmt *mf = &format->format;
> + struct i2c_client *client = v4l2_get_subdevdata(sd);
> +
> + if (format->pad)
> + return -EINVAL;
> +
> + if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
> + format->format = *v4l2_subdev_get_try_format(&hi846->sd,
> + cfg,
> + format->pad);
> + return 0;
> + }
> +
> + mutex_lock(&hi846->mutex);
> + mf->code = HI846_MEDIA_BUS_FORMAT;
> + mf->colorspace = V4L2_COLORSPACE_RAW;
> + mf->field = V4L2_FIELD_NONE;
> + mf->width = hi846->cur_mode->width;
> + mf->height = hi846->cur_mode->height;
> + mutex_unlock(&hi846->mutex);
> + dev_dbg(&client->dev,
> + "Get format w=%d h=%d code=0x%x colorspace=0x%x\n",
> + mf->width, mf->height, mf->code, mf->colorspace);
> +
> + return 0;
> +}
> +
> +static int hi846_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 > 0)
> + return -EINVAL;
> +
> + code->code = HI846_MEDIA_BUS_FORMAT;
> +
> + return 0;
> +}
> +
> +static int hi846_enum_frame_size(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_frame_size_enum *fse)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(sd);
> +
> + if (fse->pad || fse->index >= ARRAY_SIZE(supported_modes))
> + return -EINVAL;
> +
> + if (fse->code != HI846_MEDIA_BUS_FORMAT) {
> + dev_err(&client->dev, "frame size enum not matching\n");
> + return -EINVAL;
> + }
> +
> + fse->min_width = supported_modes[fse->index].width;
> + fse->max_width = supported_modes[fse->index].width;
> + fse->min_height = supported_modes[fse->index].height;
> + fse->max_height = supported_modes[fse->index].height;
> +
> + dev_dbg(&client->dev, "%s: max width: %d max height: %d\n", __func__,
> + fse->max_width, fse->max_height);
> +
> + return 0;
> +}
> +
> +static int hi846_s_power(struct v4l2_subdev *sd, int on)
> +{
> + struct hi846 *hi846 = to_hi846(sd);
> + struct i2c_client *client = v4l2_get_subdevdata(sd);
> + struct device *dev = &client->dev;
> + int ret = 0;
> +
> + mutex_lock(&hi846->mutex);
> + if (on) {
> + ret = hi846_resume(dev);
> + if (ret)
> + goto out;
> + } else {
> + ret = hi846_suspend(dev);
> + if (ret)
> + goto out;
> + }
> +out:
> + mutex_unlock(&hi846->mutex);
> + return ret;
> +}
> +
> +static int hi846_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +{
> + struct hi846 *hi846 = to_hi846(sd);
> + struct v4l2_mbus_framefmt *mf;
> +
> + mf = v4l2_subdev_get_try_format(sd, fh->pad, 0);
> +
> + mutex_lock(&hi846->mutex);
> + mf->code = HI846_MEDIA_BUS_FORMAT;
> + mf->colorspace = V4L2_COLORSPACE_RAW;
> + mf->field = V4L2_FIELD_NONE;
> + mf->width = hi846->cur_mode->width;
> + mf->height = hi846->cur_mode->height;
> + mutex_unlock(&hi846->mutex);
> +
> + return 0;
> +}

Initialization of the try format is better performed in the .init_cfg()
function, you can then drop .open().

> +
> +static const struct v4l2_subdev_video_ops hi846_video_ops = {
> + .s_stream = hi846_set_stream,
> +};
> +
> +static const struct v4l2_subdev_pad_ops hi846_pad_ops = {
> + .enum_frame_size = hi846_enum_frame_size,
> + .enum_mbus_code = hi846_enum_mbus_code,
> + .set_fmt = hi846_set_format,
> + .get_fmt = hi846_get_format,

Please also implement .get_selection() to allow querying the CROP,
CROP_BOUNDS and CROP_DEFAULT. The first one can depend on the current
mode, the last two should be fixed.

> +};
> +
> +static struct v4l2_subdev_core_ops hi846_core_ops = {

This should be const.

> + .s_power = hi846_s_power,

.s_power() is deprecated, power should be controlled at .s_stream() time
with runtime PM, and the driver should use the runtime PM autoidle
feature.

> + .log_status = v4l2_ctrl_subdev_log_status,
> +};
> +
> +static const struct v4l2_subdev_ops hi846_subdev_ops = {
> + .core = &hi846_core_ops,
> + .video = &hi846_video_ops,
> + .pad = &hi846_pad_ops,
> +};
> +
> +static const struct media_entity_operations hi846_subdev_entity_ops = {
> + .link_validate = v4l2_subdev_link_validate,
> +};
> +
> +static const struct v4l2_subdev_internal_ops hi846_internal_ops = {
> + .open = hi846_open,
> +};
> +
> +static void hi846_rst_gpio_assert(struct hi846 *hi846, bool on)
> +{
> + struct hi846_gpio *gpio = &hi846->rst_gpio;
> +
> + if (gpio == NULL)
> + return;
> +
> + if (on)
> + gpio_set_value(gpio->gpio, gpio->level);
> + else
> + gpio_set_value(gpio->gpio, !gpio->level);
> +}
> +
> +static int hi846_parse_gpio(struct hi846_gpio *gpio, struct device *dev)
> +{
> + struct device_node *node = dev->of_node;
> + enum of_gpio_flags flags;
> + int ret;
> +
> + ret = of_get_named_gpio_flags(node, "reset-gpios", 0, &flags);
> + if (ret < 0) {
> + dev_err(dev, "no reset-gpios provided: %d\n", ret);
> + return ret;
> + }
> + gpio->gpio = ret;
> + gpio->level = !(flags & OF_GPIO_ACTIVE_LOW);
> +
> + return 0;
> +}
> +
> +static int hi846_identify_module(struct hi846 *hi846)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&hi846->sd);
> + int ret;
> + u8 hi, lo;
> +
> + ret = hi846_read_reg(hi846, HI846_REG_CHIP_ID_L, &lo);
> + if (ret)
> + return ret;
> +
> + if (lo != HI846_CHIP_ID_L) {
> + dev_err(&client->dev, "wrong chip id low byte: %x", lo);
> + return -ENXIO;
> + }
> +
> + ret = hi846_read_reg(hi846, HI846_REG_CHIP_ID_H, &hi);
> + if (ret)
> + return ret;
> +
> + if (hi != HI846_CHIP_ID_H) {
> + dev_err(&client->dev, "wrong chip id high byte: %x", hi);
> + return -ENXIO;
> + }
> +
> + dev_info(&client->dev, "chip id %02X %02X using %d mipi lanes\n", hi, lo,
> + hi846->nr_lanes);
> +
> + return 0;
> +}
> +
> +static int hi846_check_hwcfg(struct device *dev, u8 *lanes)
> +{
> + struct fwnode_handle *ep;
> + struct fwnode_handle *fwnode = dev_fwnode(dev);
> + struct v4l2_fwnode_endpoint bus_cfg = {
> + .bus_type = V4L2_MBUS_CSI2_DPHY
> + };
> + int ret = 0;

No need to initialize ret to 0.

> +
> + if (!fwnode)
> + return -ENXIO;

Can this happen ?

> +
> + ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
> + if (!ep)

An error message would be nice.

> + return -ENXIO;
> +
> + ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg);
> + fwnode_handle_put(ep);
> + if (ret)

Same here.

> + return ret;
> +
> + if (bus_cfg.bus.mipi_csi2.num_data_lanes != 2 &&
> + bus_cfg.bus.mipi_csi2.num_data_lanes != 4) {
> + dev_err(dev, "number of CSI2 data lanes %d is not supported",
> + bus_cfg.bus.mipi_csi2.num_data_lanes);
> + ret = -EINVAL;
> + goto check_hwcfg_error;
> + }
> +
> + *lanes = bus_cfg.bus.mipi_csi2.num_data_lanes;
> +
> +check_hwcfg_error:
> + v4l2_fwnode_endpoint_free(&bus_cfg);
> +
> + return ret;
> +}
> +
> +static int hi846_remove(struct i2c_client *client)
> +{
> + struct v4l2_subdev *sd = i2c_get_clientdata(client);
> + struct hi846 *hi846 = to_hi846(sd);
> +
> + v4l2_async_unregister_subdev(sd);
> + media_entity_cleanup(&sd->entity);
> + v4l2_ctrl_handler_free(sd->ctrl_handler);
> +
> + pm_runtime_disable(&client->dev);
> + if (!pm_runtime_status_suspended(&client->dev))
> + hi846_suspend(&client->dev);
> + pm_runtime_set_suspended(&client->dev);
> +
> + mutex_destroy(&hi846->mutex);
> +
> + return 0;
> +}

It's customary to place remove() after probe() (but not required).

> +
> +static int hi846_probe(struct i2c_client *client)
> +{
> + struct hi846 *hi846;
> + int ret;
> + u8 lanes;
> +
> + ret = hi846_check_hwcfg(&client->dev, &lanes);
> + if (ret) {
> + dev_err(&client->dev, "failed to check HW configuration: %d",
> + ret);
> + return ret;
> + }

I'd move this after the devm_kzalloc(). The function will then be able
to set hi846->nr_lanes directly. I'd also rename it to hi846_parse_dt()
or something similar.

> +
> + hi846 = devm_kzalloc(&client->dev, sizeof(*hi846), GFP_KERNEL);
> + if (!hi846)
> + return -ENOMEM;
> +
> + hi846->nr_lanes = lanes;
> +
> + v4l2_i2c_subdev_init(&hi846->sd, client, &hi846_subdev_ops);

Let's acquire all the resources (GPIOs, clocks and regulators) before
dealing with subdev initialization.

> +
> + ret = hi846_parse_gpio(&hi846->rst_gpio, &client->dev);
> + if (ret < 0) {
> + dev_err(&client->dev, "parse gpio failed: %d\n", ret);
> + return ret;
> + }
> +
> + hi846->vdd_regulator = devm_regulator_get(&client->dev, "vdd");
> + if (IS_ERR(hi846->vdd_regulator))
> + dev_warn(&client->dev, "cannot get voltage regulator\n");
> +
> + hi846->vdd1_regulator = devm_regulator_get(&client->dev, "vdd1");

Not documented in the DT bindings, and there's no VDD1 supply in the
datasheet.

> + if (IS_ERR(hi846->vdd1_regulator))
> + dev_warn(&client->dev, "cannot get voltage regulator\n");
> +
> + ret = hi846_regulator_enable(hi846);
> + if (ret) {
> + dev_err(&client->dev, "regulator enable failed: %d\n", ret);
> + return ret;
> + }

And let's move the regualtor enable with the clock prepare below. I'd
actually move the regulator enable, clock enable and reset handling to a
separate hi846_power_on() function, as you need to do the same here and
in hi846_resume(). Same for power off.

> +
> + hi846->clock = devm_clk_get(hi846->sd.dev, "mclk");
> + if (IS_ERR(hi846->clock)) {
> + dev_err(&client->dev, "get clk failed\n");
> + ret = -EPROBE_DEFER;
> + goto probe_error_regulator;
> + }
> +
> + ret = clk_prepare_enable(hi846->clock);
> + if (ret < 0)
> + goto probe_error_regulator;
> +
> + msleep(100);

I see corresponding delay in the datasheet. There's however a 2400 MCLK
cycles delay required after deassering RESETB before issuing the first
I2C transaction.

> +
> + hi846_rst_gpio_assert(hi846, true);
> +
> + ret = hi846_identify_module(hi846);
> + if (ret) {
> + dev_err(&client->dev, "failed to find sensor: %d", ret);
> + goto probe_error_regulator;
> + }
> +
> + mutex_init(&hi846->mutex);
> +
> + hi846->cur_mode = &supported_modes[0];
> + ret = hi846_init_controls(hi846);
> + if (ret) {
> + dev_err(&client->dev, "failed to init controls: %d", ret);
> + goto probe_error_v4l2_ctrl_handler_free;
> + }
> +
> + hi846->sd.internal_ops = &hi846_internal_ops;
> + hi846->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> + hi846->sd.entity.ops = &hi846_subdev_entity_ops;
> + hi846->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
> + hi846->pad.flags = MEDIA_PAD_FL_SOURCE;
> + ret = media_entity_pads_init(&hi846->sd.entity, 1, &hi846->pad);
> + if (ret) {
> + dev_err(&client->dev, "failed to init entity pads: %d", ret);
> + goto probe_error_v4l2_ctrl_handler_free;
> + }
> +
> + ret = v4l2_async_register_subdev_sensor(&hi846->sd);
> + if (ret < 0) {
> + dev_err(&client->dev, "failed to register V4L2 subdev: %d",
> + ret);
> + goto probe_error_media_entity_cleanup;
> + }
> +
> + pm_runtime_set_active(&client->dev);
> + pm_runtime_enable(&client->dev);
> + pm_runtime_idle(&client->dev);
> +
> + return 0;
> +
> +probe_error_media_entity_cleanup:
> + media_entity_cleanup(&hi846->sd.entity);
> +
> +probe_error_v4l2_ctrl_handler_free:
> + v4l2_ctrl_handler_free(hi846->sd.ctrl_handler);
> + mutex_destroy(&hi846->mutex);
> +
> +probe_error_regulator:
> + hi846_regulator_disable(hi846);
> +
> + return ret;
> +}
> +
> +static UNIVERSAL_DEV_PM_OPS(hi846_pm_ops, hi846_suspend, hi846_resume, NULL);
> +
> +static const struct of_device_id hi846_of_match[] = {
> + { .compatible = "hynix,hi846", },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, hi846_of_match);
> +
> +static struct i2c_driver hi846_i2c_driver = {
> + .driver = {
> + .name = "hi846",
> + .pm = &hi846_pm_ops,
> + .of_match_table = of_match_ptr(hi846_of_match),
> + },
> + .probe_new = hi846_probe,
> + .remove = hi846_remove,
> +};
> +
> +module_i2c_driver(hi846_i2c_driver);
> +
> +MODULE_AUTHOR("Angus Ainslie <angus@akkea.ca>");
> +MODULE_AUTHOR("Martin Kepplinger <martin.kepplinger@puri.sm>");
> +MODULE_DESCRIPTION("Hynix HI846 sensor driver");
> +MODULE_LICENSE("GPL v2");

--
Regards,

Laurent Pinchart