[PATCH v5 5/6] drm/mediatek: add DSC support for mt8195

[Chun-Kuang Hu]

Hi, Jason:

jason-jh.lin <jason-jh.lin at mediatek.com> 於 2021年7月30日 週五 上午1:07寫道：
>
> Add DSC into mtk_drm_ddp_comp to support for mt8195.
>
> 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.
>
> Signed-off-by: jason-jh.lin <jason-jh.lin at mediatek.com>
> ---
> This patch is base on [1]
>
> [1]add mt8195 SoC DRM binding
> - https://patchwork.kernel.org/project/linux-mediatek/list/?series=519597
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 46 +++++++++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h |  1 +
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c      |  2 +
>  3 files changed, 49 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 75bc00e17fc4..6f4a9b8c9914 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -65,6 +65,12 @@
>  #define DITHER_ADD_LSHIFT_G(x)                 (((x) & 0x7) << 4)
>  #define DITHER_ADD_RSHIFT_G(x)                 (((x) & 0x7) << 0)
>
> +#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)
> +
>  struct mtk_ddp_comp_dev {
>         struct clk *clk;
>         void __iomem *regs;
> @@ -246,6 +252,35 @@ static void mtk_dither_stop(struct device *dev)
>         writel_relaxed(0x0, priv->regs + DISP_DITHER_EN);
>  }
>
> +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 const struct mtk_ddp_comp_funcs ddp_aal = {
>         .clk_enable = mtk_ddp_clk_enable,
>         .clk_disable = mtk_ddp_clk_disable,
> @@ -284,6 +319,14 @@ 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,
> @@ -356,6 +399,7 @@ static const char * const mtk_ddp_comp_stem[MTK_DDP_COMP_TYPE_MAX] = {
>         [MTK_DISP_MUTEX] = "mutex",
>         [MTK_DISP_OD] = "od",
>         [MTK_DISP_BLS] = "bls",
> +       [MTK_DISP_DSC] = "dsc",

Would you please send a patch to make alphabetic order then apply this patch?

>  };
>
>  struct mtk_ddp_comp_match {
> @@ -374,6 +418,8 @@ 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 bb914d976cf5..661fb620e266 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -34,6 +34,7 @@ enum mtk_ddp_comp_type {
>         MTK_DISP_MUTEX,
>         MTK_DISP_OD,
>         MTK_DISP_BLS,
> +       MTK_DISP_DSC,

Ditto.

>         MTK_DDP_COMP_TYPE_MAX,
>  };
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index d6f6d1bdad85..0f6bb4bdc58a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -446,6 +446,8 @@ static const struct of_device_id mtk_ddp_comp_dt_ids[] = {
>           .data = (void *)MTK_DISP_GAMMA, },
>         { .compatible = "mediatek,mt8183-disp-dither",
>           .data = (void *)MTK_DISP_DITHER },
> +       { .compatible = "mediatek,mt8195-disp-dsc",
> +         .data = (void *)MTK_DISP_DSC },

I would like you move this patch before the patch "add mediatek-drm of
vdosys0 support for mt8195" and move this part into that patch.

Regards,
Chun-Kuang.

>         { .compatible = "mediatek,mt8173-disp-ufoe",
>           .data = (void *)MTK_DISP_UFOE },
>         { .compatible = "mediatek,mt2701-dsi",
> --
> 2.18.0
>