linux-kernel - Re: [PATCH v13 11/14] drm/mediatek: dpi: Add YUV422 output support

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Message-ID: <98679256-5903-3923-dcaf-5a965174e049@collabora.com>
Date:   Tue, 21 Jun 2022 14:11:41 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Bo-Chen Chen <rex-bc.chen@...iatek.com>, chunkuang.hu@...nel.org,
        p.zabel@...gutronix.de, daniel@...ll.ch, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, matthias.bgg@...il.com,
        airlied@...ux.ie
Cc:     msp@...libre.com, granquet@...libre.com, jitao.shi@...iatek.com,
        wenst@...omium.org, ck.hu@...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 v13 11/14] drm/mediatek: dpi: Add YUV422 output support

Il 21/06/22 13:37, Bo-Chen Chen ha scritto:
> Dp_intf supports YUV422 as output format. In MT8195 Chrome project,
> YUV422 output format is used for 4K resolution.
> 
> To support this, it is also needed to support color format transfer.
> Color format transfer is a new feature for both dpi and dpintf of MT8195.
> 
> The input format could be RGB888 and output format for dp_intf should be
> YUV422. Therefore, we add a mtk_dpi_matrix_sel() helper to update the
> DPI_MATRIX_SET register depending on the color format.
> 
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
> ---
>   drivers/gpu/drm/mediatek/mtk_dpi.c      | 34 ++++++++++++++++++++++++-
>   drivers/gpu/drm/mediatek/mtk_dpi_regs.h |  3 +++
>   2 files changed, 36 insertions(+), 1 deletion(-)
> 

..snip..

> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> index 3a02fabe1662..65fce11316b7 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> @@ -217,4 +217,7 @@
>   
>   #define EDGE_SEL_EN			BIT(5)
>   #define H_FRE_2N			BIT(25)
> +
> +#define DPI_MATRIX_SET		0xB4
> +#define INT_MATRIX_SEL_MASK	(0x1F << 0)

Please, change INT_MATRIX_SEL_MASK: that's GENMASK(4, 0).

After that,

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

>   #endif /* __MTK_DPI_REGS_H */