Hi, Jason:
jason-jh.lin <jason-jh.lin@xxxxxxxxxxxx> 於 2021年8月19日 週四 上午10:23寫道：
>
> DSC is designed for real-time systems with real-time compression,
> transmission, decompression and display.
> The DSC standard is a specification of the algorithms used for
> compressing and decompressing image display streams, including
> the specification of the syntax and semantics of the compressed
> video bit stream.
>
Reviewed-by: Chun-Kuang Hu <chunkuang.hu@xxxxxxxxxx>
> Signed-off-by: jason-jh.lin <jason-jh.lin@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 46 +++++++++++++++++++++
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 1 +
> 2 files changed, 47 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 28bc42fd0b8a..929630a6d832 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -45,6 +45,12 @@
> #define DITHER_LSB_ERR_SHIFT_G(x) (((x) & 0x7) << 12)
> #define DITHER_ADD_LSHIFT_G(x) (((x) & 0x7) << 4)
>
> +#define DISP_REG_DSC_CON 0x0000
> +#define DSC_EN BIT(0)
> +#define DSC_DUAL_INOUT BIT(2)
> +#define DSC_BYPASS BIT(4)
> +#define DSC_UFOE_SEL BIT(16)
> +
> #define DISP_REG_OD_EN 0x0000
> #define DISP_REG_OD_CFG 0x0020
> #define OD_RELAYMODE BIT(0)
> @@ -211,6 +217,35 @@ static void mtk_dither_set(struct device *dev, unsigned int bpc,
> DISP_DITHERING, cmdq_pkt);
> }
>
> +static void mtk_dsc_config(struct device *dev, unsigned int w,
> + unsigned int h, unsigned int vrefresh,
> + unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
> +{
> + struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
> +
> + /* dsc bypass mode */
> + mtk_ddp_write_mask(cmdq_pkt, DSC_BYPASS, &priv->cmdq_reg, priv->regs,
> + DISP_REG_DSC_CON, DSC_BYPASS);
> + mtk_ddp_write_mask(cmdq_pkt, DSC_UFOE_SEL, &priv->cmdq_reg, priv->regs,
> + DISP_REG_DSC_CON, DSC_UFOE_SEL);
> + mtk_ddp_write_mask(cmdq_pkt, DSC_DUAL_INOUT, &priv->cmdq_reg, priv->regs,
> + DISP_REG_DSC_CON, DSC_DUAL_INOUT);
> +}
> +
> +static void mtk_dsc_start(struct device *dev)
> +{
> + struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
> +
> + writel_relaxed(DSC_EN, &priv->regs + DISP_REG_DSC_CON);
> +}
> +
> +static void mtk_dsc_stop(struct device *dev)
> +{
> + struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
> +
> + writel_relaxed(0x0, priv->regs + DISP_REG_DSC_CON);
> +}
> +
> static void mtk_od_config(struct device *dev, unsigned int w,
> unsigned int h, unsigned int vrefresh,
> unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
> @@ -274,6 +309,14 @@ static const struct mtk_ddp_comp_funcs ddp_dpi = {
> .stop = mtk_dpi_stop,
> };
>
> +static const struct mtk_ddp_comp_funcs ddp_dsc = {
> + .clk_enable = mtk_ddp_clk_enable,
> + .clk_disable = mtk_ddp_clk_disable,
> + .config = mtk_dsc_config,
> + .start = mtk_dsc_start,
> + .stop = mtk_dsc_stop,
> +};
> +
> static const struct mtk_ddp_comp_funcs ddp_dsi = {
> .start = mtk_dsi_ddp_start,
> .stop = mtk_dsi_ddp_stop,
> @@ -335,6 +378,7 @@ static const char * const mtk_ddp_comp_stem[MTK_DDP_COMP_TYPE_MAX] = {
> [MTK_DISP_CCORR] = "ccorr",
> [MTK_DISP_COLOR] = "color",
> [MTK_DISP_DITHER] = "dither",
> + [MTK_DISP_DSC] = "dsc",
> [MTK_DISP_GAMMA] = "gamma",
> [MTK_DISP_MUTEX] = "mutex",
> [MTK_DISP_OD] = "od",
> @@ -364,6 +408,8 @@ static const struct mtk_ddp_comp_match mtk_ddp_matches[DDP_COMPONENT_ID_MAX] = {
> [DDP_COMPONENT_DITHER] = { MTK_DISP_DITHER, 0, &ddp_dither },
> [DDP_COMPONENT_DPI0] = { MTK_DPI, 0, &ddp_dpi },
> [DDP_COMPONENT_DPI1] = { MTK_DPI, 1, &ddp_dpi },
> + [DDP_COMPONENT_DSC0] = { MTK_DISP_DSC, 0, &ddp_dsc },
> + [DDP_COMPONENT_DSC1] = { MTK_DISP_DSC, 1, &ddp_dsc },
> [DDP_COMPONENT_DSI0] = { MTK_DSI, 0, &ddp_dsi },
> [DDP_COMPONENT_DSI1] = { MTK_DSI, 1, &ddp_dsi },
> [DDP_COMPONENT_DSI2] = { MTK_DSI, 2, &ddp_dsi },
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> index d317b944df66..560be6bc9d0e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -23,6 +23,7 @@ enum mtk_ddp_comp_type {
> MTK_DISP_CCORR,
> MTK_DISP_COLOR,
> MTK_DISP_DITHER,
> + MTK_DISP_DSC,
> MTK_DISP_GAMMA,
> MTK_DISP_MUTEX,
> MTK_DISP_OD,
> --
> 2.18.0
>
