linux-kernel - Re: [PATCH v4] media: ov8856: Configure sensor for GRBG Bayer for all modes

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Message-ID: <db76aedb-de5e-2040-1e1c-777848614a7f@linaro.org>
Date:   Mon, 18 Jan 2021 22:18:46 +0300
From:   Andrey Konovalov <andrey.konovalov@...aro.org>
To:     Robert Foss <robert.foss@...aro.org>, dongchun.zhu@...iatek.com,
        mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Bingbu Cao <bingbu.cao@...ux.intel.com>
Cc:     Tomasz Figa <tfiga@...gle.com>
Subject: Re: [PATCH v4] media: ov8856: Configure sensor for GRBG Bayer for all
 modes

Hi Robert,

Thanks for you patch!

Reviewed-by: Andrey Konovalov <andrey.konovalov@...aro.org>

On 18.01.2021 22:01, Robert Foss wrote:
> The previously added modes 3264x2448 & 1632x1224 are actually
> configuring the sensor for BGGR mode, this is an issue since
> the mode that is exposed through V4L incorrectly is set as GRBG.
> 
> This patch fixes the issue by moving the output crop window of
> internal sensor ISP uses by one row, which means that the Bayer
> pattern of the output is changed.
> 
> From:
> row 1: B G B G B G ...
> row 2: G R G R G R ...
> raw 3: B G B G B G ...
> ...
> 
> To:
> raw 2: G R G R G R ...
> raw 3: B G B G B G ...
> ...
> 
> Signed-off-by: Robert Foss <robert.foss@...aro.org>
> Suggested-by: Andrey Konovalov <andrey.konovalov@...aro.org>
> ---
> 
> Changes since v1:
>   - Sakari: Added mode information to ov8856_mode struct
>   - Sakari: enum_mbus_code updated
> 
> Changes since v2:
>   - Andrey: Switched approach to changing the sensor configuration
>     to yield identical Bayer modes for all modes
> 
> Changes since v3:
>   - Andrey: Improve commit msg to explain Bayer shift better
> 
>   drivers/media/i2c/ov8856.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
> index 2f4ceaa80593..8a355135c7db 100644
> --- a/drivers/media/i2c/ov8856.c
> +++ b/drivers/media/i2c/ov8856.c
> @@ -428,7 +428,7 @@ static const struct ov8856_reg mode_3264x2448_regs[] = {
>   	{0x3810, 0x00},
>   	{0x3811, 0x04},
>   	{0x3812, 0x00},
> -	{0x3813, 0x02},
> +	{0x3813, 0x01},
>   	{0x3814, 0x01},
>   	{0x3815, 0x01},
>   	{0x3816, 0x00},
> @@ -821,7 +821,7 @@ static const struct ov8856_reg mode_1632x1224_regs[] = {
>   	{0x3810, 0x00},
>   	{0x3811, 0x02},
>   	{0x3812, 0x00},
> -	{0x3813, 0x02},
> +	{0x3813, 0x01},
>   	{0x3814, 0x03},
>   	{0x3815, 0x01},
>   	{0x3816, 0x00},
>