Subject: Re: [V2, 2/2] media: i2c: Add more sensor modes for ov8856 camera sensor

From: Dongchun Zhu <[email-masked]>
Date: Wed, 30 Oct 2019 21:02:08 +0800

Hi Sakari,

On Fri, 2019-09-13 at 10:55 +0300, Sakari Ailus wrote:
> Hi Dongchun,
> 
> On Tue, Sep 10, 2019 at 09:04:46PM +0800, [email-masked] wrote:
> > From: Dongchun Zhu <[email-masked]>
> > 
> > This patch mainly adds two more sensor modes for OV8856 CMOS image sensor.
> > That is, the resolution of 1632*1224 and 3264*2448, corresponding to the bayer order of BGGR.
> > The sensor revision also differs in some OTP register.
> > 
> > Signed-off-by: Dongchun Zhu <[email-masked]>
> > ---
> >  drivers/media/i2c/ov8856.c | 654 +++++++++++++++++++++++++++++++++++++++++++--
> >  1 file changed, 639 insertions(+), 15 deletions(-)
> > 
> > diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
> > index cd347d6..9ad0b73 100644
> > --- a/drivers/media/i2c/ov8856.c
> > +++ b/drivers/media/i2c/ov8856.c
> > @@ -1,12 +1,15 @@
> >  // SPDX-License-Identifier: GPL-2.0
> >  // Copyright (c) 2019 Intel Corporation.
> >  
> > +#include <linux/clk.h>
> >  #include <asm/unaligned.h>
> >  #include <linux/acpi.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/regulator/consumer.h>
> >  #include <media/v4l2-ctrls.h>
> >  #include <media/v4l2-device.h>
> >  #include <media/v4l2-fwnode.h>
> > @@ -18,10 +21,15 @@
> >  #define OV8856_LINK_FREQ_360MHZ		360000000ULL
> >  #define OV8856_LINK_FREQ_180MHZ		180000000ULL
> >  #define OV8856_SCLK			144000000ULL
> > -#define OV8856_MCLK			19200000
> > +#define OV8856_XVCLK			19200000
> > +#define OV8856_XVCLK_TYP		24000000
> 
> How about calling these e.g. OV8856_XCLK_19_2 and OV8856_CLK_24? Or just
> use the plain numbers; there's nothing really special about them.
> 
> Ideally you'd have both in a single location in the driver --- an array of
> modes supported on each of them as they're different.
> 

Fixed in next release.

> >  #define OV8856_DATA_LANES		4
> >  #define OV8856_RGB_DEPTH		10
> >  
> > +#define REG_X_ADDR_START		0x3808
> > +#define X_OUTPUT_FULL_SIZE		0x0cc0
> > +#define X_OUTPUT_BINNING_SIZE		0x0660
> > +
> >  #define OV8856_REG_CHIP_ID		0x300a
> >  #define OV8856_CHIP_ID			0x00885a
> >  
> > @@ -29,6 +37,22 @@
> >  #define OV8856_MODE_STANDBY		0x00
> >  #define OV8856_MODE_STREAMING		0x01
> >  
> > +/* define 1B module revision */
> > +#define OV8856_1B_MODULE		0x02
> > +
> > +/* the OTP read-out buffer is at 0x7000 and 0xf is the offset
> > + * of the byte in the OTP that means the module revision
> > + */
> > +#define OV8856_MODULE_REVISION		0x700f
> > +#define OV8856_OTP_MODE_CTRL		0x3d84
> > +#define OV8856_OTP_LOAD_CTRL		0x3d81
> > +#define OV8856_OTP_MODE_AUTO		0x00
> > +#define OV8856_OTP_LOAD_CTRL_ENABLE	BIT(0)
> > +
> > +/* Analog control register that decided by module revision */
> > +#define OV8856_ANAL_MODE_CTRL		0x3614
> > +#define OV8856_ANAL_1B_VAL		0x20
> > +
> >  /* vertical-timings from sensor */
> >  #define OV8856_REG_VTS			0x380e
> >  #define OV8856_VTS_MAX			0x7fff
> > @@ -64,6 +88,14 @@
> >  
> >  #define to_ov8856(_sd)			container_of(_sd, struct ov8856, sd)
> >  
> > +static const char * const ov8856_supply_names[] = {
> > +	"dovdd",	/* Digital I/O power */
> > +	"avdd",		/* Analog power */
> > +	"dvdd",		/* Digital core power */
> > +};
> > +
> > +#define OV8856_NUM_SUPPLIES ARRAY_SIZE(ov8856_supply_names)
> > +
> >  enum {
> >  	OV8856_LINK_FREQ_720MBPS,
> >  	OV8856_LINK_FREQ_360MBPS,
> > @@ -195,11 +227,11 @@ static const struct ov8856_reg mode_3280x2464_regs[] = {
> >  	{0x3800, 0x00},
> >  	{0x3801, 0x00},
> >  	{0x3802, 0x00},
> > -	{0x3803, 0x06},
> > +	{0x3803, 0x07},
> >  	{0x3804, 0x0c},
> >  	{0x3805, 0xdf},
> >  	{0x3806, 0x09},
> > -	{0x3807, 0xa7},
> > +	{0x3807, 0xa6},
> 
> This is changing an existing sensor mode. What are the effects of the
> change?
> 
> Given that this register is not documented in the driver in any way, I'd
> expect the commit message to carry some reasoning behind the change, also
> suggesting it belongs to a separate patch. The same applies to changes to
> the other existing modes.
> 

Removed in next release.

> >  	{0x3808, 0x0c},
> >  	{0x3809, 0xd0},
> >  	{0x380a, 0x09},
> > @@ -211,7 +243,7 @@ static const struct ov8856_reg mode_3280x2464_regs[] = {
> >  	{0x3810, 0x00},
> >  	{0x3811, 0x00},
> >  	{0x3812, 0x00},
> > -	{0x3813, 0x01},
> > +	{0x3813, 0x00},
> >  	{0x3814, 0x01},
> >  	{0x3815, 0x01},
> >  	{0x3816, 0x00},
> > @@ -316,6 +348,209 @@ static const struct ov8856_reg mode_3280x2464_regs[] = {
> >  	{0x5e00, 0x00}
> >  };
> >  
> > +static const struct ov8856_reg mode_3264x2448_regs[] = {
> > +	{0x0103, 0x01},
> > +	{0x0302, 0x3c},
> > +	{0x0303, 0x01},
> > +	{0x031e, 0x0c},
> > +	{0x3000, 0x20},
> > +	{0x3003, 0x08},
> > +	{0x300e, 0x20},
> > +	{0x3010, 0x00},
> > +	{0x3015, 0x84},
> > +	{0x3018, 0x72},
> > +	{0x3021, 0x23},
> > +	{0x3033, 0x24},
> > +	{0x3500, 0x00},
> > +	{0x3501, 0x9a},
> > +	{0x3502, 0x20},
> > +	{0x3503, 0x08},
> > +	{0x3505, 0x83},
> > +	{0x3508, 0x01},
> > +	{0x3509, 0x80},
> > +	{0x350c, 0x00},
> > +	{0x350d, 0x80},
> > +	{0x350e, 0x04},
> > +	{0x350f, 0x00},
> > +	{0x3510, 0x00},
> > +	{0x3511, 0x02},
> > +	{0x3512, 0x00},
> > +	{0x3600, 0x72},
> > +	{0x3601, 0x40},
> > +	{0x3602, 0x30},
> > +	{0x3610, 0xc5},
> > +	{0x3611, 0x58},
> > +	{0x3612, 0x5c},
> > +	{0x3613, 0xca},
> > +	{0x3614, 0x60},
> > +	{0x3628, 0xff},
> > +	{0x3629, 0xff},
> > +	{0x362a, 0xff},
> > +	{0x3633, 0x10},
> > +	{0x3634, 0x10},
> > +	{0x3635, 0x10},
> > +	{0x3636, 0x10},
> > +	{0x3663, 0x08},
> > +	{0x3669, 0x34},
> > +	{0x366d, 0x00},
> > +	{0x366e, 0x10},
> > +	{0x3706, 0x86},
> > +	{0x370b, 0x7e},
> > +	{0x3714, 0x23},
> > +	{0x3730, 0x12},
> > +	{0x3733, 0x10},
> > +	{0x3764, 0x00},
> > +	{0x3765, 0x00},
> > +	{0x3769, 0x62},
> > +	{0x376a, 0x2a},
> > +	{0x376b, 0x30},
> > +	{0x3780, 0x00},
> > +	{0x3781, 0x24},
> > +	{0x3782, 0x00},
> > +	{0x3783, 0x23},
> > +	{0x3798, 0x2f},
> > +	{0x37a1, 0x60},
> > +	{0x37a8, 0x6a},
> > +	{0x37ab, 0x3f},
> > +	{0x37c2, 0x04},
> > +	{0x37c3, 0xf1},
> > +	{0x37c9, 0x80},
> > +	{0x37cb, 0x16},
> > +	{0x37cc, 0x16},
> > +	{0x37cd, 0x16},
> > +	{0x37ce, 0x16},
> > +	{0x3800, 0x00},
> > +	{0x3801, 0x00},
> > +	{0x3802, 0x00},
> > +	{0x3803, 0x0c},
> > +	{0x3804, 0x0c},
> > +	{0x3805, 0xdf},
> > +	{0x3806, 0x09},
> > +	{0x3807, 0xa3},
> > +	{0x3808, 0x0c},
> > +	{0x3809, 0xc0},
> > +	{0x380a, 0x09},
> > +	{0x380b, 0x90},
> > +	{0x380c, 0x07},
> > +	{0x380d, 0x8c},
> > +	{0x380e, 0x09},
> > +	{0x380f, 0xb2},
> > +	{0x3810, 0x00},
> > +	{0x3811, 0x04},
> > +	{0x3812, 0x00},
> > +	{0x3813, 0x02},
> > +	{0x3814, 0x01},
> > +	{0x3815, 0x01},
> > +	{0x3816, 0x00},
> > +	{0x3817, 0x00},
> > +	{0x3818, 0x00},
> > +	{0x3819, 0x00},
> > +	{0x3820, 0x80},
> > +	{0x3821, 0x46},
> > +	{0x382a, 0x01},
> > +	{0x382b, 0x01},
> > +	{0x3830, 0x06},
> > +	{0x3836, 0x02},
> > +	{0x3862, 0x04},
> > +	{0x3863, 0x08},
> > +	{0x3cc0, 0x33},
> > +	{0x3d85, 0x17},
> > +	{0x3d8c, 0x73},
> > +	{0x3d8d, 0xde},
> > +	{0x4001, 0xe0},
> > +	{0x4003, 0x40},
> > +	{0x4008, 0x00},
> > +	{0x4009, 0x0b},
> > +	{0x400a, 0x00},
> > +	{0x400b, 0x84},
> > +	{0x400f, 0x80},
> > +	{0x4010, 0xf0},
> > +	{0x4011, 0xff},
> > +	{0x4012, 0x02},
> > +	{0x4013, 0x01},
> > +	{0x4014, 0x01},
> > +	{0x4015, 0x01},
> > +	{0x4042, 0x00},
> > +	{0x4043, 0x80},
> > +	{0x4044, 0x00},
> > +	{0x4045, 0x80},
> > +	{0x4046, 0x00},
> > +	{0x4047, 0x80},
> > +	{0x4048, 0x00},
> > +	{0x4049, 0x80},
> > +	{0x4041, 0x03},
> > +	{0x404c, 0x20},
> > +	{0x404d, 0x00},
> > +	{0x404e, 0x20},
> > +	{0x4203, 0x80},
> > +	{0x4307, 0x30},
> > +	{0x4317, 0x00},
> > +	{0x4502, 0x50},
> > +	{0x4503, 0x08},
> > +	{0x4601, 0x80},
> > +	{0x4800, 0x44},
> > +	{0x4816, 0x53},
> > +	{0x481b, 0x50},
> > +	{0x481f, 0x27},
> > +	{0x4823, 0x3c},
> > +	{0x482b, 0x00},
> > +	{0x4831, 0x66},
> > +	{0x4837, 0x16},
> > +	{0x483c, 0x0f},
> > +	{0x484b, 0x05},
> > +	{0x5000, 0x77},
> > +	{0x5001, 0x0a},
> > +	{0x5003, 0xc8},
> > +	{0x5004, 0x04},
> > +	{0x5006, 0x00},
> > +	{0x5007, 0x00},
> > +	{0x502e, 0x03},
> > +	{0x5030, 0x41},
> > +	{0x5780, 0x14},
> > +	{0x5781, 0x0f},
> > +	{0x5782, 0x44},
> > +	{0x5783, 0x02},
> > +	{0x5784, 0x01},
> > +	{0x5785, 0x01},
> > +	{0x5786, 0x00},
> > +	{0x5787, 0x04},
> > +	{0x5788, 0x02},
> > +	{0x5789, 0x0f},
> > +	{0x578a, 0xfd},
> > +	{0x578b, 0xf5},
> > +	{0x578c, 0xf5},
> > +	{0x578d, 0x03},
> > +	{0x578e, 0x08},
> > +	{0x578f, 0x0c},
> > +	{0x5790, 0x08},
> > +	{0x5791, 0x04},
> > +	{0x5792, 0x00},
> > +	{0x5793, 0x52},
> > +	{0x5794, 0xa3},
> > +	{0x5795, 0x02},
> > +	{0x5796, 0x20},
> > +	{0x5797, 0x20},
> > +	{0x5798, 0xd5},
> > +	{0x5799, 0xd5},
> > +	{0x579a, 0x00},
> > +	{0x579b, 0x50},
> > +	{0x579c, 0x00},
> > +	{0x579d, 0x2c},
> > +	{0x579e, 0x0c},
> > +	{0x579f, 0x40},
> > +	{0x57a0, 0x09},
> > +	{0x57a1, 0x40},
> > +	{0x59f8, 0x3d},
> > +	{0x5a08, 0x02},
> > +	{0x5b00, 0x02},
> > +	{0x5b01, 0x10},
> > +	{0x5b02, 0x03},
> > +	{0x5b03, 0xcf},
> > +	{0x5b05, 0x6c},
> > +	{0x5e00, 0x00},
> > +	{0x5e10, 0xfc}
> > +};
> > +
> >  static const struct ov8856_reg mode_1640x1232_regs[] = {
> >  	{0x3000, 0x20},
> >  	{0x3003, 0x08},
> > @@ -385,11 +620,11 @@ static const struct ov8856_reg mode_1640x1232_regs[] = {
> >  	{0x3800, 0x00},
> >  	{0x3801, 0x00},
> >  	{0x3802, 0x00},
> > -	{0x3803, 0x06},
> > +	{0x3803, 0x07},
> >  	{0x3804, 0x0c},
> >  	{0x3805, 0xdf},
> >  	{0x3806, 0x09},
> > -	{0x3807, 0xa7},
> > +	{0x3807, 0xa6},
> >  	{0x3808, 0x06},
> >  	{0x3809, 0x68},
> >  	{0x380a, 0x04},
> > @@ -401,7 +636,7 @@ static const struct ov8856_reg mode_1640x1232_regs[] = {
> >  	{0x3810, 0x00},
> >  	{0x3811, 0x00},
> >  	{0x3812, 0x00},
> > -	{0x3813, 0x01},
> > +	{0x3813, 0x00},
> >  	{0x3814, 0x03},
> >  	{0x3815, 0x01},
> >  	{0x3816, 0x00},
> > @@ -506,6 +741,209 @@ static const struct ov8856_reg mode_1640x1232_regs[] = {
> >  	{0x5e00, 0x00}
> >  };
> >  
> > +static const struct ov8856_reg mode_1632x1224_regs[] = {
> > +	{0x0103, 0x01},
> > +	{0x0302, 0x3c},
> > +	{0x0303, 0x01},
> > +	{0x031e, 0x0c},
> > +	{0x3000, 0x20},
> > +	{0x3003, 0x08},
> > +	{0x300e, 0x20},
> > +	{0x3010, 0x00},
> > +	{0x3015, 0x84},
> > +	{0x3018, 0x72},
> > +	{0x3021, 0x23},
> > +	{0x3033, 0x24},
> > +	{0x3500, 0x00},
> > +	{0x3501, 0x4c},
> > +	{0x3502, 0xe0},
> > +	{0x3503, 0x08},
> > +	{0x3505, 0x83},
> > +	{0x3508, 0x01},
> > +	{0x3509, 0x80},
> > +	{0x350c, 0x00},
> > +	{0x350d, 0x80},
> > +	{0x350e, 0x04},
> > +	{0x350f, 0x00},
> > +	{0x3510, 0x00},
> > +	{0x3511, 0x02},
> > +	{0x3512, 0x00},
> > +	{0x3600, 0x72},
> > +	{0x3601, 0x40},
> > +	{0x3602, 0x30},
> > +	{0x3610, 0xc5},
> > +	{0x3611, 0x58},
> > +	{0x3612, 0x5c},
> > +	{0x3613, 0xca},
> > +	{0x3614, 0x60},
> > +	{0x3628, 0xff},
> > +	{0x3629, 0xff},
> > +	{0x362a, 0xff},
> > +	{0x3633, 0x10},
> > +	{0x3634, 0x10},
> > +	{0x3635, 0x10},
> > +	{0x3636, 0x10},
> > +	{0x3663, 0x08},
> > +	{0x3669, 0x34},
> > +	{0x366d, 0x00},
> > +	{0x366e, 0x08},
> > +	{0x3706, 0x86},
> > +	{0x370b, 0x7e},
> > +	{0x3714, 0x27},
> > +	{0x3730, 0x12},
> > +	{0x3733, 0x10},
> > +	{0x3764, 0x00},
> > +	{0x3765, 0x00},
> > +	{0x3769, 0x62},
> > +	{0x376a, 0x2a},
> > +	{0x376b, 0x30},
> > +	{0x3780, 0x00},
> > +	{0x3781, 0x24},
> > +	{0x3782, 0x00},
> > +	{0x3783, 0x23},
> > +	{0x3798, 0x2f},
> > +	{0x37a1, 0x60},
> > +	{0x37a8, 0x6a},
> > +	{0x37ab, 0x3f},
> > +	{0x37c2, 0x14},
> > +	{0x37c3, 0xf1},
> > +	{0x37c9, 0x80},
> > +	{0x37cb, 0x16},
> > +	{0x37cc, 0x16},
> > +	{0x37cd, 0x16},
> > +	{0x37ce, 0x16},
> > +	{0x3800, 0x00},
> > +	{0x3801, 0x00},
> > +	{0x3802, 0x00},
> > +	{0x3803, 0x0c},
> > +	{0x3804, 0x0c},
> > +	{0x3805, 0xdf},
> > +	{0x3806, 0x09},
> > +	{0x3807, 0xa3},
> > +	{0x3808, 0x06},
> > +	{0x3809, 0x60},
> > +	{0x380a, 0x04},
> > +	{0x380b, 0xc8},
> > +	{0x380c, 0x07},
> > +	{0x380d, 0x8c},
> > +	{0x380e, 0x09},
> > +	{0x380f, 0xb2},
> > +	{0x3810, 0x00},
> > +	{0x3811, 0x02},
> > +	{0x3812, 0x00},
> > +	{0x3813, 0x02},
> > +	{0x3814, 0x03},
> > +	{0x3815, 0x01},
> > +	{0x3816, 0x00},
> > +	{0x3817, 0x00},
> > +	{0x3818, 0x00},
> > +	{0x3819, 0x00},
> > +	{0x3820, 0x80},
> > +	{0x3821, 0x47},
> > +	{0x382a, 0x03},
> > +	{0x382b, 0x01},
> > +	{0x3830, 0x06},
> > +	{0x3836, 0x02},
> > +	{0x3862, 0x04},
> > +	{0x3863, 0x08},
> > +	{0x3cc0, 0x33},
> > +	{0x3d85, 0x17},
> > +	{0x3d8c, 0x73},
> > +	{0x3d8d, 0xde},
> > +	{0x4001, 0xe0},
> > +	{0x4003, 0x40},
> > +	{0x4008, 0x00},
> > +	{0x4009, 0x05},
> > +	{0x400a, 0x00},
> > +	{0x400b, 0x84},
> > +	{0x400f, 0x80},
> > +	{0x4010, 0xf0},
> > +	{0x4011, 0xff},
> > +	{0x4012, 0x02},
> > +	{0x4013, 0x01},
> > +	{0x4014, 0x01},
> > +	{0x4015, 0x01},
> > +	{0x4042, 0x00},
> > +	{0x4043, 0x80},
> > +	{0x4044, 0x00},
> > +	{0x4045, 0x80},
> > +	{0x4046, 0x00},
> > +	{0x4047, 0x80},
> > +	{0x4048, 0x00},
> > +	{0x4049, 0x80},
> > +	{0x4041, 0x03},
> > +	{0x404c, 0x20},
> > +	{0x404d, 0x00},
> > +	{0x404e, 0x20},
> > +	{0x4203, 0x80},
> > +	{0x4307, 0x30},
> > +	{0x4317, 0x00},
> > +	{0x4502, 0x50},
> > +	{0x4503, 0x08},
> > +	{0x4601, 0x80},
> > +	{0x4800, 0x44},
> > +	{0x4816, 0x53},
> > +	{0x481b, 0x50},
> > +	{0x481f, 0x27},
> > +	{0x4823, 0x3c},
> > +	{0x482b, 0x00},
> > +	{0x4831, 0x66},
> > +	{0x4837, 0x16},
> > +	{0x483c, 0x0f},
> > +	{0x484b, 0x05},
> > +	{0x5000, 0x77},
> > +	{0x5001, 0x0a},
> > +	{0x5003, 0xc8},
> > +	{0x5004, 0x04},
> > +	{0x5006, 0x00},
> > +	{0x5007, 0x00},
> > +	{0x502e, 0x03},
> > +	{0x5030, 0x41},
> > +	{0x5795, 0x00},
> > +	{0x5796, 0x10},
> > +	{0x5797, 0x10},
> > +	{0x5798, 0x73},
> > +	{0x5799, 0x73},
> > +	{0x579a, 0x00},
> > +	{0x579b, 0x28},
> > +	{0x579c, 0x00},
> > +	{0x579d, 0x16},
> > +	{0x579e, 0x06},
> > +	{0x579f, 0x20},
> > +	{0x57a0, 0x04},
> > +	{0x57a1, 0xa0},
> > +	{0x5780, 0x14},
> > +	{0x5781, 0x0f},
> > +	{0x5782, 0x44},
> > +	{0x5783, 0x02},
> > +	{0x5784, 0x01},
> > +	{0x5785, 0x01},
> > +	{0x5786, 0x00},
> > +	{0x5787, 0x04},
> > +	{0x5788, 0x02},
> > +	{0x5789, 0x0f},
> > +	{0x578a, 0xfd},
> > +	{0x578b, 0xf5},
> > +	{0x578c, 0xf5},
> > +	{0x578d, 0x03},
> > +	{0x578e, 0x08},
> > +	{0x578f, 0x0c},
> > +	{0x5790, 0x08},
> > +	{0x5791, 0x04},
> > +	{0x5792, 0x00},
> > +	{0x5793, 0x52},
> > +	{0x5794, 0xa3},
> > +	{0x59f8, 0x3d},
> > +	{0x5a08, 0x02},
> > +	{0x5b00, 0x02},
> > +	{0x5b01, 0x10},
> > +	{0x5b02, 0x03},
> > +	{0x5b03, 0xcf},
> > +	{0x5b05, 0x6c},
> > +	{0x5e00, 0x00},
> > +	{0x5e10, 0xfc}
> > +};
> > +
> >  static const char * const ov8856_test_pattern_menu[] = {
> >  	"Disabled",
> >  	"Standard Color Bar",
> > @@ -548,6 +986,18 @@ static const struct ov8856_mode supported_modes[] = {
> >  		.link_freq_index = OV8856_LINK_FREQ_720MBPS,
> >  	},
> >  	{
> > +		.width    = 3264,
> > +		.height   = 2448,
> > +		.hts      = 1932,
> > +		.vts_def  = 2482,
> > +		.vts_min  = 2482,
> > +		.reg_list = {
> > +			.num_of_regs = ARRAY_SIZE(mode_3264x2448_regs),
> > +			.regs = mode_3264x2448_regs,
> > +		},
> > +		.link_freq_index = OV8856_LINK_FREQ_720MBPS,
> > +	},
> 
> How do you guarantee that the modes are only used on the xvclk frequency
> they're intended for?
> 
> I think it'd be best if you added the new modes in a separete patch.
> 

In a separate patch?

> > +	{
> >  		.width = 1640,
> >  		.height = 1232,
> >  		.hts = 3820,
> > @@ -558,6 +1008,18 @@ static const struct ov8856_mode supported_modes[] = {
> >  			.regs = mode_1640x1232_regs,
> >  		},
> >  		.link_freq_index = OV8856_LINK_FREQ_360MBPS,
> > +	},
> > +	{
> > +		.width    = 1632,
> > +		.height   = 1224,
> > +		.hts      = 1932,
> > +		.vts_def  = 2482,
> > +		.vts_min  = 2482,
> > +		.reg_list = {
> > +			.num_of_regs = ARRAY_SIZE(mode_1632x1224_regs),
> > +			.regs = mode_1632x1224_regs,
> > +		},
> > +		.link_freq_index = OV8856_LINK_FREQ_360MBPS,
> >  	}
> >  };
> >  
> > @@ -566,16 +1028,28 @@ struct ov8856 {
> >  	struct media_pad pad;
> >  	struct v4l2_ctrl_handler ctrl_handler;
> >  
> > +	struct clk		*xvclk;
> > +	struct gpio_desc	*n_shutdn_gpio;
> > +	struct regulator_bulk_data supplies[OV8856_NUM_SUPPLIES];
> > +
> >  	/* V4L2 Controls */
> >  	struct v4l2_ctrl *link_freq;
> >  	struct v4l2_ctrl *pixel_rate;
> >  	struct v4l2_ctrl *vblank;
> >  	struct v4l2_ctrl *hblank;
> >  	struct v4l2_ctrl *exposure;
> > +	struct v4l2_mbus_framefmt	fmt;
> >  
> >  	/* Current mode */
> >  	const struct ov8856_mode *cur_mode;
> >  
> > +	/* module hardware version that can be read out from register 0x700f
> > +	 * the register value corresponds to different hardware version
> > +	 * 01: 2A module revision
> > +	 * 02: 1B module revision
> > +	 */
> > +	bool is_1B_revision;
> > +
> >  	/* To serialize asynchronus callbacks */
> >  	struct mutex mutex;
> >  
> > @@ -696,6 +1170,25 @@ static int ov8856_test_pattern(struct ov8856 *ov8856, u32 pattern)
> >  				OV8856_REG_VALUE_08BIT, pattern);
> >  }
> >  
> > +static int ov8856_check_revision(struct ov8856 *ov8856)
> > +{
> > +	int ret;
> > +
> > +	ret = ov8856_write_reg(ov8856, OV8856_REG_MODE_SELECT,
> > +			       OV8856_REG_VALUE_08BIT, OV8856_MODE_STREAMING);
> > +	if (ret)
> > +		return ret;
> > +
> > +	ret = ov8856_write_reg(ov8856, OV8856_OTP_MODE_CTRL,
> > +			       OV8856_REG_VALUE_08BIT, OV8856_OTP_MODE_AUTO);
> > +	if (ret)
> > +		return ret;
> > +
> > +	return ov8856_write_reg(ov8856, OV8856_OTP_LOAD_CTRL,
> > +				OV8856_REG_VALUE_08BIT,
> > +				OV8856_OTP_LOAD_CTRL_ENABLE);
> 
> Is it not necessary to disable streaming after reading EEPROM?
> 

These registers are provided by OV vendor.
They need to be initialized before reading sensor revision.

> > +}
> > +
> >  static int ov8856_set_ctrl(struct v4l2_ctrl *ctrl)
> >  {
> >  	struct ov8856 *ov8856 = container_of(ctrl->handler,
> > @@ -825,7 +1318,6 @@ static void ov8856_update_pad_format(const struct ov8856_mode *mode,
> >  {
> >  	fmt->width = mode->width;
> >  	fmt->height = mode->height;
> > -	fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
> >  	fmt->field = V4L2_FIELD_NONE;
> >  }
> >  
> > @@ -834,6 +1326,7 @@ static int ov8856_start_streaming(struct ov8856 *ov8856)
> >  	struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
> >  	const struct ov8856_reg_list *reg_list;
> >  	int link_freq_index, ret;
> > +	u32 h_size;
> >  
> >  	link_freq_index = ov8856->cur_mode->link_freq_index;
> >  	reg_list = &link_freq_configs[link_freq_index].reg_list;
> > @@ -850,6 +1343,29 @@ static int ov8856_start_streaming(struct ov8856 *ov8856)
> >  		return ret;
> >  	}
> >  
> > +	/* Update R3614 if the revision is 1B module */
> > +	if (ov8856->is_1B_revision) {
> > +		ret = ov8856_write_reg(ov8856, OV8856_ANAL_MODE_CTRL,
> > +				       OV8856_REG_VALUE_08BIT,
> > +				       OV8856_ANAL_1B_VAL);
> > +		if (ret) {
> > +			dev_err(&client->dev, "failed to set R3614");
> > +			return ret;
> > +		}
> > +	}
> > +
> > +	ret = ov8856_read_reg(ov8856, REG_X_ADDR_START,
> > +			      OV8856_REG_VALUE_16BIT, &h_size);
> > +	if (ret) {
> > +		dev_err(&client->dev, "failed to read out R3614");
> > +		return ret;
> > +	}
> > +
> > +	if (h_size == X_OUTPUT_FULL_SIZE || h_size == X_OUTPUT_BINNING_SIZE)
> > +		ov8856->fmt.code = MEDIA_BUS_FMT_SBGGR10_1X10;
> 
> I wonder if this condition is right. The pixel order (and thus the media
> bus code) is determined by cropping (and flipping and mirroring, but
> they're not supported right now). See e.g. the smiapp driver for an
> example.
> 
> The correct media bus code needs to be available to the user through the
> regular API at all times, not only after streaming is started.
> 
> I'd suggest adding support for other pixel orders in a separate patch.
> 

This may need time to think out.
Is there any recommended regular API?  

> > +
> >  	ret = __v4l2_ctrl_handler_setup(ov8856->sd.ctrl_handler);
> >  	if (ret)
> >  		return ret;
> > @@ -878,6 +1394,7 @@ static int ov8856_set_stream(struct v4l2_subdev *sd, int enable)
> >  	struct ov8856 *ov8856 = to_ov8856(sd);
> >  	struct i2c_client *client = v4l2_get_subdevdata(sd);
> >  	int ret = 0;
> > +	u32 val;
> >  
> >  	if (ov8856->streaming == enable)
> >  		return 0;
> > @@ -908,6 +1425,44 @@ static int ov8856_set_stream(struct v4l2_subdev *sd, int enable)
> >  	return ret;
> >  }
> >  
> > +static int __ov8856_power_on(struct ov8856 *ov8856)
> > +{
> > +	struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
> > +	int ret;
> > +
> > +	ret = clk_prepare_enable(ov8856->xvclk);
> > +	if (ret < 0) {
> > +		dev_err(&client->dev, "failed to enable xvclk\n");
> > +		return ret;
> > +	}
> > +
> > +	gpiod_set_value_cansleep(ov8856->n_shutdn_gpio, GPIOD_OUT_LOW);
> > +
> > +	ret = regulator_bulk_enable(OV8856_NUM_SUPPLIES, ov8856->supplies);
> > +	if (ret < 0) {
> > +		dev_err(&client->dev, "failed to enable regulators\n");
> > +		goto disable_clk;
> > +	}
> > +
> > +	gpiod_set_value_cansleep(ov8856->n_shutdn_gpio, GPIOD_OUT_HIGH);
> 
> ..., 1);
> 
> > +
> > +	usleep_range(1400, 1500);
> > +
> > +	return 0;
> > +
> > +disable_clk:
> > +	clk_disable_unprepare(ov8856->xvclk);
> 
> How about the n_shutdn GPIO?
> 

This is power up sequence function.
When enabling regulators failed, it is required to disable the enabled
power previously.
Thus here we need to disable xvclk.
But for n_shutdn GPIO, it was low state at that time.
So we don't need to do anything for it.

> > +
> > +	return ret;
> > +}
> > +
> > +static void __ov8856_power_off(struct ov8856 *ov8856)
> > +{
> > +	gpiod_set_value_cansleep(ov8856->n_shutdn_gpio, 1);
> 
> Why to inactivate xshutdn here (it already was)?
> 
> > +	regulator_bulk_disable(OV8856_NUM_SUPPLIES, ov8856->supplies);
> > +	clk_disable_unprepare(ov8856->xvclk);
> > +}
> > +
> >  static int __maybe_unused ov8856_suspend(struct device *dev)
> >  {
> >  	struct i2c_client *client = to_i2c_client(dev);
> > @@ -951,6 +1506,7 @@ static int ov8856_set_format(struct v4l2_subdev *sd,
> >  			     struct v4l2_subdev_format *fmt)
> >  {
> >  	struct ov8856 *ov8856 = to_ov8856(sd);
> > +	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> >  	const struct ov8856_mode *mode;
> >  	s32 vblank_def, h_blank;
> >  
> > @@ -960,7 +1516,9 @@ static int ov8856_set_format(struct v4l2_subdev *sd,
> >  				      fmt->format.height);
> >  
> >  	mutex_lock(&ov8856->mutex);
> > -	ov8856_update_pad_format(mode, &fmt->format);
> > +	mbus_fmt->code = ov8856->fmt.code;
> > +	ov8856_update_pad_format(mode, mbus_fmt);
> > +	ov8856->fmt = fmt->format;
> >  	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
> >  		*v4l2_subdev_get_try_format(sd, cfg, fmt->pad) = fmt->format;
> >  	} else {
> > @@ -992,13 +1550,17 @@ static int ov8856_get_format(struct v4l2_subdev *sd,
> >  			     struct v4l2_subdev_format *fmt)
> >  {
> >  	struct ov8856 *ov8856 = to_ov8856(sd);
> > +	struct v4l2_mbus_framefmt *mbus_fmt = &fmt->format;
> >  
> >  	mutex_lock(&ov8856->mutex);
> > -	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
> > +	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
> >  		fmt->format = *v4l2_subdev_get_try_format(&ov8856->sd, cfg,
> >  							  fmt->pad);
> > -	else
> > -		ov8856_update_pad_format(ov8856->cur_mode, &fmt->format);
> > +	} else {
> > +		fmt->format = ov8856->fmt;
> > +		ov8856_update_pad_format(ov8856->cur_mode, mbus_fmt);
> > +		mbus_fmt->code = ov8856->fmt.code;
> > +	}
> >  
> >  	mutex_unlock(&ov8856->mutex);
> >  
> > @@ -1009,11 +1571,12 @@ static int ov8856_enum_mbus_code(struct v4l2_subdev *sd,
> >  				 struct v4l2_subdev_pad_config *cfg,
> >  				 struct v4l2_subdev_mbus_code_enum *code)
> >  {
> > -	/* Only one bayer order GRBG is supported */
> > +	struct ov8856 *ov8856 = to_ov8856(sd);
> > +
> >  	if (code->index > 0)
> >  		return -EINVAL;
> >  
> > -	code->code = MEDIA_BUS_FMT_SGRBG10_1X10;
> > +	code->code = ov8856->fmt.code;
> >  
> >  	return 0;
> >  }
> > @@ -1089,6 +1652,20 @@ static int ov8856_identify_module(struct ov8856 *ov8856)
> >  		return -ENXIO;
> >  	}
> >  
> > +	/* check sensor hardware revision */
> > +	ret = ov8856_check_revision(ov8856);
> > +	if (ret) {
> > +		dev_err(&client->dev, "failed to check sensor revision");
> > +		return ret;
> > +	}
> > +
> > +	ret = ov8856_read_reg(ov8856, OV8856_MODULE_REVISION,
> > +			      OV8856_REG_VALUE_08BIT, &val);
> > +	if (ret)
> > +		return ret;
> > +
> > +	ov8856->is_1B_revision = (val == OV8856_1B_MODULE) ? 1 : 0;
> > +
> >  	return 0;
> >  }
> >  
> > @@ -1107,7 +1684,7 @@ static int ov8856_check_hwcfg(struct device *dev)
> >  		return -ENXIO;
> >  
> >  	fwnode_property_read_u32(fwnode, "clock-frequency", &mclk);
> > -	if (mclk != OV8856_MCLK) {
> > +	if (mclk != OV8856_XVCLK) {
> >  		dev_err(dev, "external clock %d is not supported", mclk);
> >  		return -EINVAL;
> >  	}
> > @@ -1164,6 +1741,9 @@ static int ov8856_remove(struct i2c_client *client)
> >  	media_entity_cleanup(&sd->entity);
> >  	v4l2_ctrl_handler_free(sd->ctrl_handler);
> >  	pm_runtime_disable(&client->dev);
> > +	if (!pm_runtime_status_suspended(&client->dev))
> > +		__ov8856_power_off(ov8856);
> > +	pm_runtime_set_suspended(&client->dev);
> >  	mutex_destroy(&ov8856->mutex);
> >  
> >  	return 0;
> > @@ -1172,6 +1752,7 @@ static int ov8856_remove(struct i2c_client *client)
> >  static int ov8856_probe(struct i2c_client *client)
> >  {
> >  	struct ov8856 *ov8856;
> > +	unsigned int i;
> >  	int ret;
> >  
> >  	ret = ov8856_check_hwcfg(&client->dev);
> > @@ -1186,6 +1767,42 @@ static int ov8856_probe(struct i2c_client *client)
> >  		return -ENOMEM;
> >  
> >  	v4l2_i2c_subdev_init(&ov8856->sd, client, &ov8856_subdev_ops);
> > +	ov8856->fmt.code = MEDIA_BUS_FMT_SGRBG10_1X10;
> > +
> > +	ov8856->xvclk = devm_clk_get(&client->dev, "xvclk");
> 
> Does this work on ACPI?
> 
> See e.g. the smiapp driver for an example. The same applies to the rest of
> the chunk.

For ACPI, this probe should not be executed,
as DT setting may not have compatible property.

> 
> > +	if (IS_ERR(ov8856->xvclk)) {
> > +		dev_err(&client->dev, "failed to get xvclk\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = clk_set_rate(ov8856->xvclk, OV8856_XVCLK_TYP);
> > +	if (ret < 0) {
> > +		dev_err(&client->dev, "failed to set xvclk rate (24MHz)\n");
> > +		return ret;
> > +	}
> > +	if (clk_get_rate(ov8856->xvclk) != OV8856_XVCLK_TYP)
> > +		dev_warn(&client->dev,
> > +			 "xvclk mismatched, modes are based on 24MHz\n");
> > +
> > +	ov8856->n_shutdn_gpio = devm_gpiod_get(&client->dev, "reset",
> > +					       GPIOD_OUT_LOW);
> > +	if (IS_ERR(ov8856->n_shutdn_gpio)) {
> > +		dev_err(&client->dev, "failed to get reset-gpios\n");
> > +		return -EINVAL;
> > +	}
> > +
> > +	for (i = 0; i < OV8856_NUM_SUPPLIES; i++)
> > +		ov8856->supplies[i].supply = ov8856_supply_names[i];
> > +
> > +	ret = devm_regulator_bulk_get(&client->dev, OV8856_NUM_SUPPLIES,
> > +				      ov8856->supplies);
> > +	if (ret)
> > +		dev_warn(&client->dev, "failed to get regulators\n");
> > +
> > +	ret = __ov8856_power_on(ov8856);
> > +	if (ret)
> > +		dev_warn(&client->dev, "failed to power on\n");
> > +
> >  	ret = ov8856_identify_module(ov8856);
> >  	if (ret) {
> >  		dev_err(&client->dev, "failed to find sensor: %d", ret);
> > @@ -1251,11 +1868,18 @@ static const struct acpi_device_id ov8856_acpi_ids[] = {
> >  MODULE_DEVICE_TABLE(acpi, ov8856_acpi_ids);
> >  #endif
> >  
> > +static const struct of_device_id ov8856_of_match[] = {
> > +	{ .compatible = "ovti,ov8856" },
> > +	{},
> > +};
> > +MODULE_DEVICE_TABLE(of, ov8856_of_match);
> > +
> >  static struct i2c_driver ov8856_i2c_driver = {
> >  	.driver = {
> >  		.name = "ov8856",
> >  		.pm = &ov8856_pm_ops,
> >  		.acpi_match_table = ACPI_PTR(ov8856_acpi_ids),
> > +		.of_match_table = ov8856_of_match,
> >  	},
> >  	.probe_new = ov8856_probe,
> >  	.remove = ov8856_remove,
> 

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