linux-kernel - Re: [PATCH v12 02/14] drm/mediatek: dpi: Add support for quantization range

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Date:   Tue, 21 Jun 2022 09:40:24 +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 02/14] drm/mediatek: dpi: Add support for
 quantization range

Hi, Bo-Chen:

On Mon, 2022-06-20 at 20:10 +0800, Bo-Chen Chen wrote:
> For RGB colorimetry, CTA-861 support both limited and full range data
> when receiving video with RGB color space.
> We use drm_default_rgb_quant_range() to determine the correct
> setting.

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

> 
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 34 ++++++++++++++++++--------
> ----
>  1 file changed, 21 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index e61cd67b978f..21ad5623b568 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -235,16 +235,30 @@ static void mtk_dpi_config_fb_size(struct
> mtk_dpi *dpi, u32 width, u32 height)
>  	mtk_dpi_mask(dpi, DPI_SIZE, height << VSIZE, VSIZE_MASK);
>  }
>  
> -static void mtk_dpi_config_channel_limit(struct mtk_dpi *dpi,
> -					 struct mtk_dpi_yc_limit
> *limit)
> +static void mtk_dpi_config_channel_limit(struct mtk_dpi *dpi)
>  {
> -	mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_bottom << Y_LIMINT_BOT,
> +	struct mtk_dpi_yc_limit limit;
> +
> +	if (drm_default_rgb_quant_range(&dpi->mode) ==
> +	    HDMI_QUANTIZATION_RANGE_LIMITED) {
> +		limit.y_bottom = 0x10;
> +		limit.y_top = 0xfe0;
> +		limit.c_bottom = 0x10;
> +		limit.c_top = 0xfe0;
> +	} else {
> +		limit.y_bottom = 0;
> +		limit.y_top = 0xfff;
> +		limit.c_bottom = 0;
> +		limit.c_top = 0xfff;
> +	}
> +
> +	mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit.y_bottom << Y_LIMINT_BOT,
>  		     Y_LIMINT_BOT_MASK);
> -	mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_top << Y_LIMINT_TOP,
> +	mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit.y_top << Y_LIMINT_TOP,
>  		     Y_LIMINT_TOP_MASK);
> -	mtk_dpi_mask(dpi, DPI_C_LIMIT, limit->c_bottom << C_LIMIT_BOT,
> +	mtk_dpi_mask(dpi, DPI_C_LIMIT, limit.c_bottom << C_LIMIT_BOT,
>  		     C_LIMIT_BOT_MASK);
> -	mtk_dpi_mask(dpi, DPI_C_LIMIT, limit->c_top << C_LIMIT_TOP,
> +	mtk_dpi_mask(dpi, DPI_C_LIMIT, limit.c_top << C_LIMIT_TOP,
>  		     C_LIMIT_TOP_MASK);
>  }
>  
> @@ -449,7 +463,6 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
>  static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
>  				    struct drm_display_mode *mode)
>  {
> -	struct mtk_dpi_yc_limit limit;
>  	struct mtk_dpi_polarities dpi_pol;
>  	struct mtk_dpi_sync_param hsync;
>  	struct mtk_dpi_sync_param vsync_lodd = { 0 };
> @@ -484,11 +497,6 @@ static int mtk_dpi_set_display_mode(struct
> mtk_dpi *dpi,
>  	dev_dbg(dpi->dev, "Got  PLL %lu Hz, pixel clock %lu Hz\n",
>  		pll_rate, vm.pixelclock);
>  
> -	limit.c_bottom = 0x0010;
> -	limit.c_top = 0x0FE0;
> -	limit.y_bottom = 0x0010;
> -	limit.y_top = 0x0FE0;
> -
>  	dpi_pol.ck_pol = MTK_DPI_POLARITY_FALLING;
>  	dpi_pol.de_pol = MTK_DPI_POLARITY_RISING;
>  	dpi_pol.hsync_pol = vm.flags & DISPLAY_FLAGS_HSYNC_HIGH ?
> @@ -536,7 +544,7 @@ static int mtk_dpi_set_display_mode(struct
> mtk_dpi *dpi,
>  	else
>  		mtk_dpi_config_fb_size(dpi, vm.hactive, vm.vactive);
>  
> -	mtk_dpi_config_channel_limit(dpi, &limit);
> +	mtk_dpi_config_channel_limit(dpi);
>  	mtk_dpi_config_bit_num(dpi, dpi->bit_num);
>  	mtk_dpi_config_channel_swap(dpi, dpi->channel_swap);
>  	mtk_dpi_config_yc_map(dpi, dpi->yc_map);