linux-kernel - Re: [PATCH v12 12/14] drm/mediatek: dpi: Add YUV422 output support

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Message-ID: <d2a6c5044417e1ac8be9e6387951807e619162e8.camel@mediatek.com>
Date:   Tue, 21 Jun 2022 11:04:49 +0800
From:   CK Hu <ck.hu@...iatek.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>,
        <angelogioacchino.delregno@...labora.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 v12 12/14] drm/mediatek: dpi: Add YUV422 output support

Hi, Bo-Chen:

On Mon, 2022-06-20 at 20:10 +0800, Bo-Chen Chen wrote:
> Dp_intf supports YUV422 as output format. In MT8195 Chrome project,
> YUV422 output format is used for 4K resolution.

Move this patch before [1]. Otherwise, [1] would result in a bug.

[1] [v12,10/14] drm/mediatek: dpi: Add dpintf support

> 
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index f83ecb154457..fc76ccad0a82 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -692,7 +692,10 @@ static int mtk_dpi_bridge_atomic_check(struct
> drm_bridge *bridge,
>  	dpi->bit_num = MTK_DPI_OUT_BIT_NUM_8BITS;
>  	dpi->channel_swap = MTK_DPI_OUT_CHANNEL_SWAP_RGB;
>  	dpi->yc_map = MTK_DPI_OUT_YC_MAP_RGB;
> -	dpi->color_format = MTK_DPI_COLOR_FORMAT_RGB;
> +	if (out_bus_format == MEDIA_BUS_FMT_YUYV8_1X16)
> +		dpi->color_format =
> MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL;
> +	else
> +		dpi->color_format = MTK_DPI_COLOR_FORMAT_RGB;

If out_bus_format is MEDIA_BUS_FMT_YUV8_1X24, the color_format is
MTK_DPI_COLOR_FORMAT_RGB?

Regards,
CK

>  
>  	return 0;
>  }