linux-kernel - Re: [PATCH v9 16/22] drm/meditek: dpi: Add matrix

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Date:   Mon, 28 Mar 2022 16:49:36 +0800
From:   Rex-BC Chen <rex-bc.chen@...iatek.com>
To:     Guillaume Ranquet <granquet@...libre.com>, <airlied@...ux.ie>,
        <angelogioacchino.delregno@...labora.com>,
        <chunfeng.yun@...iatek.com>, <chunkuang.hu@...nel.org>,
        <ck.hu@...iatek.com>, <daniel@...ll.ch>, <deller@....de>,
        <jitao.shi@...iatek.com>, <kishon@...com>, <krzk+dt@...nel.org>,
        <maarten.lankhorst@...ux.intel.com>, <matthias.bgg@...il.com>,
        <mripard@...nel.org>, <p.zabel@...gutronix.de>,
        <robh+dt@...nel.org>, <tzimmermann@...e.de>, <vkoul@...nel.org>
CC:     <devicetree@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-fbdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-phy@...ts.infradead.org>, <markyacoub@...gle.com>
Subject: Re: [PATCH v9 16/22] drm/meditek: dpi: Add matrix_sel helper

On Mon, 2022-03-28 at 00:39 +0200, Guillaume Ranquet wrote:
> 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>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 8198d3cf23ac..82f97c687652 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -385,6 +385,25 @@ static void mtk_dpi_config_disable_edge(struct
> mtk_dpi *dpi)
>  		mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, 0,
> EDGE_SEL_EN);
>  }
>  
> +static void mtk_dpi_matrix_sel(struct mtk_dpi *dpi, enum
> mtk_dpi_out_color_format format)
> +{
> +	u32 matrix_sel = 0;
> +
> +	switch (format) {
> +	case MTK_DPI_COLOR_FORMAT_YCBCR_422:
> +	case MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL:
> +	case MTK_DPI_COLOR_FORMAT_YCBCR_444:
> +	case MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL:
> +	case MTK_DPI_COLOR_FORMAT_XV_YCC:
> +		if (dpi->mode.hdisplay <= 720)
> +			matrix_sel = 0x2;
> +		break;
> +	default:
> +		break;
> +	}
> +	mtk_dpi_mask(dpi, DPI_MATRIX_SET, matrix_sel,
> INT_MATRIX_SEL_MASK);
> +}
> +
>  static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
>  					enum mtk_dpi_out_color_format
> format)
>  {
> @@ -392,6 +411,7 @@ static void mtk_dpi_config_color_format(struct
> mtk_dpi *dpi,
>  	    (format == MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL)) {
>  		mtk_dpi_config_yuv422_enable(dpi, false);
>  		mtk_dpi_config_csc_enable(dpi, true);
> +		mtk_dpi_matrix_sel(dpi, format);
>  		if (dpi->conf->swap_input_support)
>  			mtk_dpi_config_swap_input(dpi, false);
>  		mtk_dpi_config_channel_swap(dpi,
> MTK_DPI_OUT_CHANNEL_SWAP_BGR);
> @@ -399,6 +419,7 @@ static void mtk_dpi_config_color_format(struct
> mtk_dpi *dpi,
>  		   (format == MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL)) {
>  		mtk_dpi_config_yuv422_enable(dpi, true);
>  		mtk_dpi_config_csc_enable(dpi, true);
> +		mtk_dpi_matrix_sel(dpi, format);
>  		if (dpi->conf->swap_input_support)
>  			mtk_dpi_config_swap_input(dpi, true);
>  		mtk_dpi_config_channel_swap(dpi,
> MTK_DPI_OUT_CHANNEL_SWAP_RGB);

Hello Guillaume,

Thanks for your patch.
I have one question:
Do this setting affect the dpi for previous SoCs?
(8183, 8192, or 8186)
If we can confirm the original register setting for this offset in
8183/8192/8186, I think we can clarify this question.

BRs,
Rex