linux-kernel - Re: [PATCH v12,2/3] drm: mediatek: Set dpi format in mmsys

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Date:   Thu, 20 Oct 2022 12:40:22 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     xinlei.lee@...iatek.com
Cc:     matthias.bgg@...il.com, rex-bc.chen@...iatek.com,
        angelogioacchino.delregno@...labora.com, jason-jh.lin@...iatek.com,
        chunkuang.hu@...nel.org, p.zabel@...gutronix.de, airlied@...ux.ie,
        daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        Jitao Shi <jitao.shi@...iatek.com>
Subject: Re: [PATCH v12,2/3] drm: mediatek: Set dpi format in mmsys

On Wed, Oct 19, 2022 at 10:52:15AM +0800, xinlei.lee@...iatek.com wrote:
[..]
> @@ -134,6 +137,7 @@ struct mtk_dpi_yc_limit {
>   * @yuv422_en_bit: Enable bit of yuv422.
>   * @csc_enable_bit: Enable bit of CSC.
>   * @pixels_per_iter: Quantity of transferred pixels per iteration.
> + * @edge_cfg_in_mmsys: If the edge configuration for DPI's output needs to be set in MMSYS.

As Angelo suggested previously, this could be written slightly shorter as 

  * @edge_cfg_in_mmsys: Edge configuration for DPI output has to be set in MMSYS.

>   */
[..]
> @@ -448,8 +453,12 @@ static void mtk_dpi_dual_edge(struct mtk_dpi *dpi)
>  		mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING,
>  			     dpi->output_fmt == MEDIA_BUS_FMT_RGB888_2X12_LE ?
>  			     EDGE_SEL : 0, EDGE_SEL);
> +		if (dpi->conf->edge_cfg_in_mmsys)
> +			mtk_mmsys_ddp_dpi_fmt_config(dpi->mmsys_dev, MTK_DPI_RGB888_DDR_CON);
>  	} else {
>  		mtk_dpi_mask(dpi, DPI_DDR_SETTING, DDR_EN | DDR_4PHASE, 0);
> +		if (dpi->conf->edge_cfg_in_mmsys)
> +			mtk_mmsys_ddp_dpi_fmt_config(dpi->mmsys_dev, MTK_DPI_RGB888_SDR_CON);

I know this isn't one of the formats supported by MT8186, but since we're using
platform-agnostic formats now... This else branch in theory could also run for a
format like MEDIA_BUS_FMT_YUYV8_1X16. Would it make sense to set
MTK_DPI_RGB888_SDR_CON in that case?

Thanks,
Nícolas

>  	}
[..]