drm/mediatek: Add DSC support for mediatek-drm

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.

Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20220526102126.19756-2-jason-jh.lin@mediatek.com/
Signed-off-by: jason-jh.lin <jason-jh.lin@mediatek.com>
Acked-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
index 5d7504a..2af1641 100644 (file)
--- 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,
@@ -343,6 +387,7 @@ 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",
@@ -373,6 +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 1cbc633..238776b 100644 (file)
--- 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,