linux-kernel - Re: [PATCH v1 1/5] drm/mediatek: mtk_dpi: Use switch in mtk_dpi_config_color

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Message-ID: <2b544b7f9ad1a15593a1bcc5655736d540edd92e.camel@mediatek.com>
Date: Tue, 22 Apr 2025 03:30:30 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
CC: Lewis Liao (廖柏鈞) <Lewis.Liao@...iatek.com>,
	Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>,
	Ives Chenjh (陳俊弘) <Ives.Chenjh@...iatek.com>,
	"simona@...ll.ch" <simona@...ll.ch>,
	TommyYL Chen (陳彥良) <TommyYL.Chen@...iatek.com>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"airlied@...il.com" <airlied@...il.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "p.zabel@...gutronix.de"
	<p.zabel@...gutronix.de>, "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"kernel@...labora.com" <kernel@...labora.com>
Subject: Re: [PATCH v1 1/5] drm/mediatek: mtk_dpi: Use switch in
 mtk_dpi_config_color_format()

On Wed, 2025-04-09 at 15:13 +0200, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until you have verified the sender or the content.
> 
> 
> In preparation for adding support for an additional color format,
> convert the format conditional in mtk_dpi_config_color_format()
> to a switch.
> This also makes the concept of RGB being the default color format
> a little more human readable.
> 
> This commit brings no functional differences.

Reviewed-by: CK Hu <ck.hu@...iatek.com>

> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 0fd13e6dd3f1..d735398e97f8 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -452,7 +452,8 @@ static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
>  {
>         mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
> 
> -       if (format == MTK_DPI_COLOR_FORMAT_YCBCR_422) {
> +       switch (format) {
> +       case MTK_DPI_COLOR_FORMAT_YCBCR_422:
>                 mtk_dpi_config_yuv422_enable(dpi, true);
>                 mtk_dpi_config_csc_enable(dpi, true);
> 
> @@ -463,11 +464,14 @@ static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
>                 mtk_dpi_mask(dpi, DPI_MATRIX_SET, dpi->mode.hdisplay <= 720 ?
>                              MATRIX_SEL_RGB_TO_BT601 : MATRIX_SEL_RGB_TO_JPEG,
>                              INT_MATRIX_SEL_MASK);
> -       } else {
> +               break;
> +       default:
> +       case MTK_DPI_COLOR_FORMAT_RGB:
>                 mtk_dpi_config_yuv422_enable(dpi, false);
>                 mtk_dpi_config_csc_enable(dpi, false);
>                 if (dpi->conf->swap_input_support)
>                         mtk_dpi_config_swap_input(dpi, false);
> +               break;
>         }
>  }
> 
> --
> 2.49.0
>