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Date: Tue, 5 Jul 2022 13:21:39 +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>,
<xinlei.lee@...iatek.com>, <liangxu.xu@...iatek.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 v15 13/16] drm/mediatek: dpi: Add YUV422 output support
Hi, Bo-Chen:
On Fri, 2022-07-01 at 11:58 +0800, Bo-Chen Chen wrote:
> Dp_intf supports YUV422 as output format. In MT8195 Chrome project,
> YUV422 output format is used for 4K resolution.
>
> To support this, it is also needed to support color format transfer.
> Color format transfer is a new feature for both dpi and dpintf of
> MT8195.
>
> The input format could be RGB888 and output format for dp_intf should
> be
> YUV422. Therefore, we 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>
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> ---
> drivers/gpu/drm/mediatek/mtk_dpi.c | 61 +++++++++++++++++++++
> ----
> drivers/gpu/drm/mediatek/mtk_dpi_regs.h | 6 +++
> 2 files changed, 59 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 3085033becbd..0a604bf68b1b 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -54,7 +54,8 @@ enum mtk_dpi_out_channel_swap {
> };
>
> enum mtk_dpi_out_color_format {
> - MTK_DPI_COLOR_FORMAT_RGB
> + MTK_DPI_COLOR_FORMAT_RGB,
> + MTK_DPI_COLOR_FORMAT_YCBCR_422
> };
>
> struct mtk_dpi {
> @@ -122,6 +123,7 @@ struct mtk_dpi_yc_limit {
> * @num_output_fmts: Quantity of supported output formats.
> * @is_ck_de_pol: Support CK/DE polarity.
> * @swap_input_support: Support input swap function.
> + * @color_fmt_trans_support: Enable color format transfer.
> * @dimension_mask: Mask used for HWIDTH, HPORCH, VSYNC_WIDTH and
> VSYNC_PORCH
> * (no shift).
> * @hvsize_mask: Mask of HSIZE and VSIZE mask (no shift).
> @@ -138,6 +140,7 @@ struct mtk_dpi_conf {
> u32 num_output_fmts;
> bool is_ck_de_pol;
> bool swap_input_support;
> + bool color_fmt_trans_support;
> u32 dimension_mask;
> u32 hvsize_mask;
> u32 channel_swap_shift;
> @@ -406,15 +409,54 @@ 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)
The format would only be MTK_DPI_COLOR_FORMAT_YCBCR_422, so drop the
parameter format.
> +{
> + u32 matrix_sel;
> +
> + if (!dpi->conf->color_fmt_trans_support) {
Only YUV format would call this function, and I think YUV support would
imply that color_fmt_trans_support is true. So drop
color_fmt_trans_support.
> + dev_info(dpi->dev, "matrix_sel is not supported.\n");
> + return;
> + }
> +
> + switch (format) {
> + case MTK_DPI_COLOR_FORMAT_YCBCR_422:
> + /*
> + * If height is smaller than 720, we need to use
> RGB_TO_BT601
> + * to transfer to yuv422. Otherwise, we use
> RGB_TO_JPEG.
> + */
> + if (dpi->mode.hdisplay <= 720)
> + matrix_sel = MATRIX_SEL_RGB_TO_BT601;
> + else
> + matrix_sel = MATRIX_SEL_RGB_TO_JPEG;
> + break;
> + default:
> + matrix_sel = MATRIX_SEL_RGB_TO_JPEG;
> + break;
> + }
> + mtk_dpi_mask(dpi, DPI_MATRIX_SET, matrix_sel,
> INT_MATRIX_SEL_MASK);
it seems that we could drop this function and write register as:
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);
> +}
> +
> static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
> enum mtk_dpi_out_color_format
> format)
> {
> - /* only support RGB888 */
> - 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);
> - mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
> + if (format == MTK_DPI_COLOR_FORMAT_YCBCR_422) {
> + 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)
This would never be true because only MT8195 support
MTK_DPI_COLOR_FORMAT_YCBCR_422 and swap_input_support of MT8195 is
false.
Regards,
CK
> + mtk_dpi_config_swap_input(dpi, true);
> + else
> + dev_warn(dpi->dev,
> + "Failed to swap input, hw is not
> supported.\n");
> + mtk_dpi_config_channel_swap(dpi,
> MTK_DPI_OUT_CHANNEL_SWAP_RGB);
> + } else {
> + 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);
> + mtk_dpi_config_channel_swap(dpi,
> MTK_DPI_OUT_CHANNEL_SWAP_RGB);
> + }
> }
>
> static void mtk_dpi_dual_edge(struct mtk_dpi *dpi)
> @@ -649,7 +691,10 @@ 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;
> + else
> + dpi->color_format = MTK_DPI_COLOR_FORMAT_RGB;
>
> return 0;
> }
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> index 3a02fabe1662..9ce300313f3e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
> @@ -217,4 +217,10 @@
>
> #define EDGE_SEL_EN BIT(5)
> #define H_FRE_2N BIT(25)
> +
> +#define DPI_MATRIX_SET 0xB4
> +#define INT_MATRIX_SEL_MASK GENMASK(4, 0)
> +#define MATRIX_SEL_RGB_TO_JPEG 0
> +#define MATRIX_SEL_RGB_TO_BT601 2
> +
> #endif /* __MTK_DPI_REGS_H */
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