linux-kernel - Re: [PATCH v1] media: ov8856: Fix Bayer format dependance on mode

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Message-ID: <20201124171338.GF3940@paasikivi.fi.intel.com>
Date:   Tue, 24 Nov 2020 19:13:39 +0200
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Robert Foss <robert.foss@...aro.org>
Cc:     dongchun.zhu@...iatek.com, mchehab@...nel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tomasz Figa <tfiga@...gle.com>,
        Bingbu Cao <bingbu.cao@...ux.intel.com>
Subject: Re: [PATCH v1] media: ov8856: Fix Bayer format dependance on mode

Hi Robert,

On Tue, Nov 24, 2020 at 04:03:32PM +0100, Robert Foss wrote:
> The Bayer GRBG10 mode used for earlier modes 3280x2460 and
> 1640x1232 isn't the mode output by the sensor for the
> 3264x2448 and 1632x1224 modes.
> 
> Switch from MEDIA_BUS_FMT_SGRBG10_1X10 to MEDIA_BUS_FMT_SBGGR10_1X10
> for 3264x2448 & 1632x1224 modes.
> 
> Signed-off-by: Robert Foss <robert.foss@...aro.org>
> ---
> 
> This patch is sent out after Dongchun Zhu clarified the Bayer
> modes used by different sensor configuration in the below thread.
> 
> https://lkml.org/lkml/2020/11/24/335
> 
>  drivers/media/i2c/ov8856.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
> index 2f4ceaa80593..a2dcbece558c 100644
> --- a/drivers/media/i2c/ov8856.c
> +++ b/drivers/media/i2c/ov8856.c
> @@ -1281,8 +1281,13 @@ 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;
> +
> +	if (mode->reg_list.regs == mode_3264x2448_regs ||
> +	    mode->reg_list.regs == mode_1632x1224_regs)
> +		fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
> +	else
> +		fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
>  }
>  
>  static int ov8856_start_streaming(struct ov8856 *ov8856)

Could you instead add the mode information to the ov8856_mode struct?

Also enum_mbus_code needs to be updated.

The mbus code also has priority in mode selection, thus only the modes for
the selected mbus code should considered in set_fmt.

-- 
Regards,

Sakari Ailus