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

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Message-ID: <170957124561.566498.576610873794356352@ping.linuxembedded.co.uk>
Date: Mon, 04 Mar 2024 16:54:05 +0000
From: Kieran Bingham <kieran.bingham@...asonboard.com>
To: Mikhail Rudenko <mike.rudenko@...il.com>, linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Cc: 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>, Mikhail Rudenko <mike.rudenko@...il.com>
Subject: Re: [PATCH v3 12/20] media: i2c: ov4689: Implement vflip/hflip controls

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?

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


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
>