Re: [PATCH v3 19/25] media: i2c: imx258: Change register settings for variants of the sensor

[Luigi311 <git@luigi311.com>]

On 4/3/24 10:18, Sakari Ailus wrote:
> Hi Luis, Dave,
> 
> On Wed, Apr 03, 2024 at 09:03:48AM -0600, git@luigi311.com wrote:
>> From: Dave Stevenson <dave.stevenson@raspberrypi.com>
>>
>> Sony have advised that there are variants of the IMX258 sensor which
>> require slightly different register configuration to the mainline
>> imx258 driver defaults.
>>
>> There is no available run-time detection for the variant, so add
>> configuration via the DT compatible string.
>>
>> The Vision Components imx258 module supports PDAF, so add the
>> register differences for that variant
>>
>> Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
>> Signed-off-by: Luis Garcia <git@luigi311.com>
>> ---
>>  drivers/media/i2c/imx258.c | 48 ++++++++++++++++++++++++++++++++++----
>>  1 file changed, 44 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
>> index 775d957c9b87..fa48da212037 100644
>> --- a/drivers/media/i2c/imx258.c
>> +++ b/drivers/media/i2c/imx258.c
>> @@ -6,6 +6,7 @@
>>  #include <linux/delay.h>
>>  #include <linux/i2c.h>
>>  #include <linux/module.h>
>> +#include <linux/of_device.h>
>>  #include <linux/pm_runtime.h>
>>  #include <linux/regulator/consumer.h>
>>  #include <media/v4l2-ctrls.h>
>> @@ -321,8 +322,6 @@ static const struct imx258_reg mipi_642mbps_24mhz_4l[] = {
>>  
>>  static const struct imx258_reg mode_common_regs[] = {
>>  	{ 0x3051, 0x00 },
>> -	{ 0x3052, 0x00 },
>> -	{ 0x4E21, 0x14 },
>>  	{ 0x6B11, 0xCF },
>>  	{ 0x7FF0, 0x08 },
>>  	{ 0x7FF1, 0x0F },
>> @@ -345,7 +344,6 @@ static const struct imx258_reg mode_common_regs[] = {
>>  	{ 0x7FA8, 0x03 },
>>  	{ 0x7FA9, 0xFE },
>>  	{ 0x7B24, 0x81 },
>> -	{ 0x7B25, 0x00 },
>>  	{ 0x6564, 0x07 },
>>  	{ 0x6B0D, 0x41 },
>>  	{ 0x653D, 0x04 },
>> @@ -460,6 +458,33 @@ static const struct imx258_reg mode_1048_780_regs[] = {
>>  	{ 0x034F, 0x0C },
>>  };
>>  
>> +struct imx258_variant_cfg {
>> +	const struct imx258_reg *regs;
>> +	unsigned int num_regs;
>> +};
>> +
>> +static const struct imx258_reg imx258_cfg_regs[] = {
>> +	{ 0x3052, 0x00 },
>> +	{ 0x4E21, 0x14 },
>> +	{ 0x7B25, 0x00 },
>> +};
>> +
>> +static const struct imx258_variant_cfg imx258_cfg = {
>> +	.regs = imx258_cfg_regs,
>> +	.num_regs = ARRAY_SIZE(imx258_cfg_regs),
>> +};
>> +
>> +static const struct imx258_reg imx258_pdaf_cfg_regs[] = {
>> +	{ 0x3052, 0x01 },
>> +	{ 0x4E21, 0x10 },
>> +	{ 0x7B25, 0x01 },
>> +};
>> +
>> +static const struct imx258_variant_cfg imx258_pdaf_cfg = {
>> +	.regs = imx258_pdaf_cfg_regs,
>> +	.num_regs = ARRAY_SIZE(imx258_pdaf_cfg_regs),
>> +};
>> +
>>  static const char * const imx258_test_pattern_menu[] = {
>>  	"Disabled",
>>  	"Solid Colour",
>> @@ -637,6 +662,8 @@ struct imx258 {
>>  	struct v4l2_subdev sd;
>>  	struct media_pad pad;
>>  
>> +	const struct imx258_variant_cfg *variant_cfg;
>> +
>>  	struct v4l2_ctrl_handler ctrl_handler;
>>  	/* V4L2 Controls */
>>  	struct v4l2_ctrl *link_freq;
>> @@ -1104,6 +1131,14 @@ static int imx258_start_streaming(struct imx258 *imx258)
>>  		return ret;
>>  	}
>>  
>> +	ret = imx258_write_regs(imx258, imx258->variant_cfg->regs,
>> +				imx258->variant_cfg->num_regs);
>> +	if (ret) {
>> +		dev_err(&client->dev, "%s failed to set variant config\n",
>> +			__func__);
>> +		return ret;
>> +	}
>> +
>>  	ret = imx258_write_reg(imx258, IMX258_CLK_BLANK_STOP,
>>  			       IMX258_REG_VALUE_08BIT,
>>  			       imx258->csi2_flags & V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK ?
>> @@ -1492,6 +1527,10 @@ static int imx258_probe(struct i2c_client *client)
>>  
>>  	imx258->csi2_flags = ep.bus.mipi_csi2.flags;
>>  
>> +	imx258->variant_cfg = of_device_get_match_data(&client->dev);
> 
> You'll also need to keep this working for ACPI based systems. I.e. in
> practice remove "of_" prefix here and add the non-PDAF variant data to the
> relevant ACPI ID list.
> 

Removing of_ is easy enough and looking at all the other commits that make
this change in other drivers I dont see anything else being done besides
adding in the .data section that is down below for both imx258 and pdaf
versions. Is that what you are referencing or is there some other place
to add variant data to ACPI ID list?

>> +	if (!imx258->variant_cfg)
>> +		imx258->variant_cfg = &imx258_cfg;
>> +
>>  	/* Initialize subdev */
>>  	v4l2_i2c_subdev_init(&imx258->sd, client, &imx258_subdev_ops);
>>  
>> @@ -1579,7 +1618,8 @@ MODULE_DEVICE_TABLE(acpi, imx258_acpi_ids);
>>  #endif
>>  
>>  static const struct of_device_id imx258_dt_ids[] = {
>> -	{ .compatible = "sony,imx258" },
>> +	{ .compatible = "sony,imx258", .data = &imx258_cfg },
>> +	{ .compatible = "sony,imx258-pdaf", .data = &imx258_pdaf_cfg },
>>  	{ /* sentinel */ }
>>  };
>>  MODULE_DEVICE_TABLE(of, imx258_dt_ids);
>