Re: [PATCH 10/19] media: i2c: ov4689: Make horizontal blanking configurable

[Mikhail Rudenko <mike.rudenko@gmail.com>]

On 2023-12-12 at 00:08 +02, Laurent Pinchart <laurent.pinchart@ideasonboard.com> wrote:

> Hi Mikhail,
>
> Thank you for the patch.
>
> On Mon, Dec 11, 2023 at 08:50:13PM +0300, Mikhail Rudenko wrote:
>> Make horizontal blanking configurable. To do so, set HTS register
>> according to the requested horizontal blanking in ov4689_set_ctrl
>> instead of the register table. Default HTS value is not changed by
>> this patch. Minimal HTS value is found experimentally and corresponds
>> to 90 fps framerate at minimum vertical blanking. Real HTS value is
>> the register value multiplied by 4.
>>
>> Signed-off-by: Mikhail Rudenko <mike.rudenko@gmail.com>
>> ---
>>  drivers/media/i2c/ov4689.c | 33 +++++++++++++++++++++------------
>>  1 file changed, 21 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/media/i2c/ov4689.c b/drivers/media/i2c/ov4689.c
>> index 9fa06941a0e5..67d4004bdcfb 100644
>> --- a/drivers/media/i2c/ov4689.c
>> +++ b/drivers/media/i2c/ov4689.c
>> @@ -30,7 +30,6 @@
>>  #define OV4689_REG_EXPOSURE		CCI_REG24(0x3500)
>>  #define OV4689_EXPOSURE_MIN		4
>>  #define OV4689_EXPOSURE_STEP		1
>> -#define OV4689_VTS_MAX			0x7fff
>>
>>  #define OV4689_REG_GAIN			CCI_REG16(0x3508)
>>  #define OV4689_GAIN_STEP		1
>> @@ -41,6 +40,11 @@
>>  #define OV4689_TEST_PATTERN_DISABLE	0x0
>>
>>  #define OV4689_REG_VTS			CCI_REG16(0x380e)
>> +#define OV4689_VTS_MAX			0x7fff
>> +
>> +#define OV4689_REG_HTS			CCI_REG16(0x380c)
>> +#define OV4689_HTS_DIVIDER		4
>> +#define OV4689_HTS_MAX			0x7fff
>
> Could you move this just before REG_VTS to keep registers sorted by
> address ?

Ack, will fix in v2.

>>
>>  #define OV4689_LANES			4
>>  #define OV4689_XVCLK_FREQ		24000000
>> @@ -61,6 +65,7 @@ struct ov4689_mode {
>>  	u32 width;
>>  	u32 height;
>>  	u32 hts_def;
>> +	u32 hts_min;
>>  	u32 vts_def;
>>  	u32 exp_def;
>>  	u32 pixel_rate;
>> @@ -104,7 +109,7 @@ struct ov4689_gain_range {
>>
>>  /*
>>   * Xclk 24Mhz
>> - * max_framerate 30fps
>> + * max_framerate 90fps
>>   * mipi_datarate per lane 1008Mbps
>>   */
>>  static const struct cci_reg_sequence ov4689_2688x1520_regs[] = {
>> @@ -175,8 +180,6 @@ static const struct cci_reg_sequence ov4689_2688x1520_regs[] = {
>>  	/* Timing control */
>>  	{CCI_REG8(0x3801), 0x08}, /* H_CROP_START_L h_crop_start[7:0] = 0x08 */
>>  	{CCI_REG8(0x3805), 0x97}, /* H_CROP_END_L h_crop_end[7:0] = 0x97 */
>> -	{CCI_REG8(0x380c), 0x0a}, /* TIMING_HTS_H hts[14:8] = 0x0a */
>> -	{CCI_REG8(0x380d), 0x0e}, /* TIMING_HTS_L hts[7:0] = 0x0e */
>>  	{CCI_REG8(0x3811), 0x08}, /* H_WIN_OFF_L h_win_off[7:0] = 0x08*/
>>  	{CCI_REG8(0x3813), 0x04}, /* V_WIN_OFF_L v_win_off[7:0] = 0x04 */
>>  	{CCI_REG8(0x3819), 0x01}, /* VSYNC_END_L vsync_end_point[7:0] = 0x01 */
>> @@ -237,7 +240,8 @@ static const struct ov4689_mode supported_modes[] = {
>>  		.crop_top = 8,
>>  		.crop_left = 16,
>>  		.exp_def = 1536,
>> -		.hts_def = 4 * 2574,
>> +		.hts_def = 10296,
>> +		.hts_min = 3432,
>>  		.vts_def = 1554,
>>  		.pixel_rate = 480000000,
>>  		.reg_list = ov4689_2688x1520_regs,
>> @@ -596,6 +600,11 @@ static int ov4689_set_ctrl(struct v4l2_ctrl *ctrl)
>>  	case V4L2_CID_TEST_PATTERN:
>>  		ret = ov4689_enable_test_pattern(ov4689, val);
>>  		break;
>> +	case V4L2_CID_HBLANK:
>> +		cci_write(regmap, OV4689_REG_HTS,
>> +			  (val + ov4689->cur_mode->width) /
>> +			  OV4689_HTS_DIVIDER, &ret);
>> +		break;
>>  	default:
>>  		dev_warn(dev, "%s Unhandled id:0x%x, val:0x%x\n",
>>  			 __func__, ctrl->id, val);
>> @@ -618,13 +627,13 @@ static int ov4689_initialize_controls(struct ov4689 *ov4689)
>>  	struct v4l2_ctrl_handler *handler;
>>  	const struct ov4689_mode *mode;
>>  	s64 exposure_max, vblank_def;
>> +	s64 hblank_def, hblank_min;
>>  	struct v4l2_ctrl *ctrl;
>> -	s64 h_blank_def;
>>  	int ret;
>>
>>  	handler = &ov4689->ctrl_handler;
>>  	mode = ov4689->cur_mode;
>> -	ret = v4l2_ctrl_handler_init(handler, 10);
>> +	ret = v4l2_ctrl_handler_init(handler, 11);
>
> The HBLANK control already exists, you're only changing how it is
> initialized. I see 8 controls being created by the driver directly,
> plus 2 created by v4l2_ctrl_new_fwnode_properties(), so I think 10 is a
> correct value here.

Yes, will adjust here and in the further patches.

> With these small issues addressed,
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
>
>>  	if (ret)
>>  		return ret;
>>
>> @@ -636,11 +645,11 @@ static int ov4689_initialize_controls(struct ov4689 *ov4689)
>>  	v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE, 0,
>>  			  mode->pixel_rate, 1, mode->pixel_rate);
>>
>> -	h_blank_def = mode->hts_def - mode->width;
>> -	ctrl = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK, h_blank_def,
>> -				 h_blank_def, 1, h_blank_def);
>> -	if (ctrl)
>> -		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
>> +	hblank_def = mode->hts_def - mode->width;
>> +	hblank_min = mode->hts_min - mode->width;
>> +	v4l2_ctrl_new_std(handler, &ov4689_ctrl_ops, V4L2_CID_HBLANK,
>> +			  hblank_min, OV4689_HTS_MAX - mode->width,
>> +			  OV4689_HTS_DIVIDER, hblank_def);
>>
>>  	vblank_def = mode->vts_def - mode->height;
>>  	v4l2_ctrl_new_std(handler, &ov4689_ctrl_ops, V4L2_CID_VBLANK,


--
Best regards,
Mikhail Rudenko