linux-kernel - Re: [PATCH v3 12/20] media: i2c: ov4689: Implement vflip/hflip controls

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Message-ID: <871q8phhmt.fsf@gmail.com>
Date: Mon, 04 Mar 2024 23:19:35 +0300
From: Mikhail Rudenko <mike.rudenko@...il.com>
To: Kieran Bingham <kieran.bingham@...asonboard.com>
Cc: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org, Sakari Ailus
 <sakari.ailus@...ux.intel.com>, Laurent Pinchart
 <laurent.pinchart@...asonboard.com>, Jacopo Mondi <jacopo@...ndi.org>,
 Tommaso Merciai <tomm.merciai@...il.com>, Christophe JAILLET
 <christophe.jaillet@...adoo.fr>, Dave Stevenson
 <dave.stevenson@...pberrypi.com>, Mauro Carvalho Chehab
 <mchehab@...nel.org>
Subject: Re: [PATCH v3 12/20] media: i2c: ov4689: Implement vflip/hflip
 controls


Hi Kieran,

and thanks for the review!

On 2024-03-04 at 16:54 GMT, Kieran Bingham <kieran.bingham@...asonboard.com> wrote:

> Quoting Mikhail Rudenko (2024-02-29 16:53:25)
>> The OV4689 sensor supports horizontal and vertical flipping. Add
>> appropriate controls to the driver. Toggling both array flip and
>> digital flip bits allows to achieve flipping while maintaining output
>> Bayer order. Note that the default value of hflip control corresponds
>> to both bits set, as it was before this patch.
>>
>> Signed-off-by: Mikhail Rudenko <mike.rudenko@...il.com>
>> ---
>>  drivers/media/i2c/ov4689.c | 24 ++++++++++++++++++++++--
>>  1 file changed, 22 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/media/i2c/ov4689.c b/drivers/media/i2c/ov4689.c
>> index 8283a9ac86c9..01ee8cadb7c9 100644
>> --- a/drivers/media/i2c/ov4689.c
>> +++ b/drivers/media/i2c/ov4689.c
>> @@ -42,6 +42,14 @@
>>  #define OV4689_REG_VTS                 CCI_REG16(0x380e)
>>  #define OV4689_VTS_MAX                 0x7fff
>>
>> +#define OV4689_REG_TIMING_FORMAT1      CCI_REG8(0x3820)
>> +#define OV4689_REG_TIMING_FORMAT2      CCI_REG8(0x3821)
>
> I assume these registerse are called TIMING_FORMAT1 and TIMING_FORMAT2,
> and they don't have any named reference to H/V?

Exactly.

> It's a shame, but I might add /* Horizontal */ and /* Vertical */
> accordingly to these definitions, though not specifically required.

Thanks for the tip, will do it in v3.

> Looks like a good breakdown of the control though.
>
> Reviewed-by: Kieran Bingham <kieran.bingham@...asonboard.com>
>
>> +#define OV4689_TIMING_FLIP_MASK                GENMASK(2, 1)
>> +#define OV4689_TIMING_FLIP_ARRAY       BIT(1)
>> +#define OV4689_TIMING_FLIP_DIGITAL     BIT(2)
>> +#define OV4689_TIMING_FLIP_BOTH                (OV4689_TIMING_FLIP_ARRAY |\
>> +                                        OV4689_TIMING_FLIP_DIGITAL)
>> +
>>  #define OV4689_REG_TEST_PATTERN                CCI_REG8(0x5040)
>>  #define OV4689_TEST_PATTERN_ENABLE     0x80
>>  #define OV4689_TEST_PATTERN_DISABLE    0x0
>> @@ -183,7 +191,6 @@ static const struct cci_reg_sequence ov4689_2688x1520_regs[] = {
>>         {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 */
>> -       {CCI_REG8(0x3821), 0x06}, /* TIMING_FORMAT2 array_h_mirror = 1, digital_h_mirror = 1 */
>>
>>         /* OTP control */
>>         {CCI_REG8(0x3d85), 0x36}, /* OTP_REG85 OTP_power_up_load_setting_enable = 1,
>> @@ -607,6 +614,16 @@ static int ov4689_set_ctrl(struct v4l2_ctrl *ctrl)
>>                           (ctrl->val + ov4689->cur_mode->width) /
>>                           OV4689_HTS_DIVIDER, &ret);
>>                 break;
>> +       case V4L2_CID_VFLIP:
>> +               cci_update_bits(regmap, OV4689_REG_TIMING_FORMAT1,
>> +                               OV4689_TIMING_FLIP_MASK,
>> +                               ctrl->val ? OV4689_TIMING_FLIP_BOTH : 0, &ret);
>> +               break;
>> +       case V4L2_CID_HFLIP:
>> +               cci_update_bits(regmap, OV4689_REG_TIMING_FORMAT2,
>> +                               OV4689_TIMING_FLIP_MASK,
>> +                               ctrl->val ? 0 : OV4689_TIMING_FLIP_BOTH, &ret);
>> +               break;
>>         default:
>>                 dev_warn(dev, "%s Unhandled id:0x%x, val:0x%x\n",
>>                          __func__, ctrl->id, ctrl->val);
>> @@ -637,7 +654,7 @@ static int ov4689_initialize_controls(struct ov4689 *ov4689)
>>
>>         handler = &ov4689->ctrl_handler;
>>         mode = ov4689->cur_mode;
>> -       ret = v4l2_ctrl_handler_init(handler, 10);
>> +       ret = v4l2_ctrl_handler_init(handler, 12);
>>         if (ret)
>>                 return ret;
>>
>> @@ -677,6 +694,9 @@ static int ov4689_initialize_controls(struct ov4689 *ov4689)
>>                                      ARRAY_SIZE(ov4689_test_pattern_menu) - 1,
>>                                      0, 0, ov4689_test_pattern_menu);
>>
>> +       v4l2_ctrl_new_std(handler, &ov4689_ctrl_ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
>> +       v4l2_ctrl_new_std(handler, &ov4689_ctrl_ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
>> +
>>         if (handler->error) {
>>                 ret = handler->error;
>>                 dev_err(ov4689->dev, "Failed to init controls(%d)\n", ret);
>> --
>> 2.43.0
>>


--
Best regards,
Mikhail Rudenko