[RESEND v17 5/7] drm/mediatek: add DSC support for mediatek-drm

jason-jh.lin
2022-04-07T03:10:41Z

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@mediatek.com>
Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Acked-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
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 f543d3eb9439..b3d26a05741f 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_DITHER0] = { 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 ad267bb8fc9b..763725fe72b3 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