[PATCH v11 14/16] drm/mediatek: add DSC support for mediatek-drm

[Chun-Kuang Hu]

Hi, Jason:

jason-jh.lin <jason-jh.lin at mediatek.com> 於 2021年9月21日 週二 下午11:52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 at kernel.org>

>
> Signed-off-by: jason-jh.lin <jason-jh.lin at mediatek.com>
> ---
> rebase on series [1]
>
> [1] drm/mediatek: add support for mediatek SOC MT8192
> - https://patchwork.kernel.org/project/linux-mediatek/list/?series=529489
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 47 +++++++++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h |  1 +
>  2 files changed, 48 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 23c03e550658..ce6c90b9edef 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -40,6 +40,12 @@
>  #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)
> @@ -181,6 +187,36 @@ 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);
> +
> +       /* write with mask to reserve the value set in mtk_dsc_config */
> +       mtk_ddp_write_mask(NULL, DSC_EN, &priv->cmdq_reg, priv->regs, DISP_REG_DSC_CON, DSC_EN);
> +}
> +
> +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)
> @@ -270,6 +306,14 @@ 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,
> @@ -339,6 +383,7 @@ 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",
> @@ -369,6 +414,8 @@ 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 4c6a98662305..5e6ff12f16ad 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
>