linux-kernel - Re: [PATCH v3 5/9] drm/mediatek: Add gamma support different lut

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Date:   Mon, 12 Sep 2022 12:25:48 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     "Jason-JH.Lin" <jason-jh.lin@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     CK Hu <ck.hu@...iatek.com>, Rex-BC Chen <rex-bc.chen@...iatek.com>,
        Singo Chang <singo.chang@...iatek.com>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v3 5/9] drm/mediatek: Add gamma support different lut_bits
 for other SoC

Il 11/09/22 17:37, Jason-JH.Lin ha scritto:
> Add lut_bits in gamma driver data for each SoC and adjust the usage
> of lut_bits in mtk_drm_gamma_set_common().
> 
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> ---
>   drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 36 ++++++++++++++++-------
>   1 file changed, 25 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> index e69d0b205b9a..155fb5d94d79 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> @@ -25,11 +25,14 @@
>   
>   #define LUT_10BIT_MASK				0x03ff
>   #define LUT_SIZE_DEFAULT			512 /* for setting gamma lut from AAL */
> +#define LUT_BITS_DEFAULT			10
> +#define LUT_INPUT_BITS				16 /* input lut bit from application */
>   
>   struct mtk_disp_gamma_data {
>   	bool has_dither;
>   	bool lut_diff;
>   	u16 lut_size;
> +	u8 lut_bits;
>   };
>   
>   /*
> @@ -72,17 +75,23 @@ void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crt
>   	struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
>   	bool lut_diff = false;
>   	u16 lut_size = LUT_SIZE_DEFAULT;
> +	u8 lut_bits = LUT_BITS_DEFAULT;

Please fix this double assignment like shown in the comment for patch [4/9].

Thanks,
Angelo