Re: [RFC PATCH 1/6] drm/msm/dpu1: Implement DSC binding to PP block for CTL V1

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On 12/13/2022 3:22 PM, Marijn Suijten wrote:
All V1 CTL blocks (active CTLs) explicitly bind the pixel output from a
DSC block to a PINGPONG block by setting the PINGPONG idx in a DSC
hardware register.

Signed-off-by: Marijn Suijten <marijn.suijten@xxxxxxxxxxxxxx>
Reviewed-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
---
  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c   |  3 +++
  .../gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h    |  9 +++++++
  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c    | 27 +++++++++++++++++++
  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h    |  4 +++
  4 files changed, 43 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 9c6817b5a194..c17ac85eb447 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -1830,6 +1830,9 @@ static void dpu_encoder_dsc_pipe_cfg(struct dpu_hw_dsc *hw_dsc,
  	if (hw_pp->ops.setup_dsc)
  		hw_pp->ops.setup_dsc(hw_pp);
+ if (hw_dsc->ops.dsc_bind_pingpong_blk)
+		hw_dsc->ops.dsc_bind_pingpong_blk(hw_dsc, true, hw_pp->idx);
+
  	if (hw_pp->ops.enable_dsc)
  		hw_pp->ops.enable_dsc(hw_pp);
  }
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
index c160dae95a69..96f849907aa2 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
@@ -268,6 +268,15 @@ enum {
  	DPU_VBIF_MAX
  };
+/**
+ * DSC features
+ * @DPU_DSC_OUTPUT_CTRL       Configure which PINGPONG block gets
+ *                            the pixel output from this DSC.
+ */
+enum {
+	DPU_DSC_OUTPUT_CTRL = 0x1,
+};
+
  /**
   * MACRO DPU_HW_BLK_INFO - information of HW blocks inside DPU
   * @name:              string name for debug purposes
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c
index 3662df698dae..619926da1441 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c
@@ -29,6 +29,8 @@
  #define DSC_RANGE_MAX_QP                0x0B0
  #define DSC_RANGE_BPG_OFFSET            0x0EC
+#define DSC_CTL(m) (0x1800 - 0x3FC * (m - DSC_0))
+
  static void dpu_hw_dsc_disable(struct dpu_hw_dsc *dsc)
  {
  	struct dpu_hw_blk_reg_map *c = &dsc->hw;
@@ -150,6 +152,29 @@ static void dpu_hw_dsc_config_thresh(struct dpu_hw_dsc *hw_dsc,
  	}
  }
+static void dpu_hw_dsc_bind_pingpong_blk(
+		struct dpu_hw_dsc *hw_dsc,
+		bool enable,
+		const enum dpu_pingpong pp)
+{
+	struct dpu_hw_blk_reg_map *c = &hw_dsc->hw;
+	int mux_cfg = 0xF;
+	u32 dsc_ctl_offset;
+
+	dsc_ctl_offset = DSC_CTL(hw_dsc->idx);
+
+	if (enable)
+		mux_cfg = (pp - PINGPONG_0) & 0x7;
+
+	DRM_DEBUG_KMS("%s dsc:%d %s pp:%d\n",
+			enable ? "Binding" : "Unbinding",
+			hw_dsc->idx - DSC_0,
+			enable ? "to" : "from",
+			pp - PINGPONG_0);
+
+	DPU_REG_WRITE(c, dsc_ctl_offset, mux_cfg);
+}
+
  static struct dpu_dsc_cfg *_dsc_offset(enum dpu_dsc dsc,
  				       const struct dpu_mdss_cfg *m,
  				       void __iomem *addr,
@@ -174,6 +199,8 @@ static void _setup_dsc_ops(struct dpu_hw_dsc_ops *ops,
  	ops->dsc_disable = dpu_hw_dsc_disable;
  	ops->dsc_config = dpu_hw_dsc_config;
  	ops->dsc_config_thresh = dpu_hw_dsc_config_thresh;
+	if (cap & BIT(DPU_DSC_OUTPUT_CTRL))
+		ops->dsc_bind_pingpong_blk = dpu_hw_dsc_bind_pingpong_blk;
  };
struct dpu_hw_dsc *dpu_hw_dsc_init(enum dpu_dsc idx, void __iomem *addr,
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h
index c0b77fe1a696..ae9b5db53d7f 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h
@@ -42,6 +42,10 @@ struct dpu_hw_dsc_ops {
  	 */
  	void (*dsc_config_thresh)(struct dpu_hw_dsc *hw_dsc,
  				  struct drm_dsc_config *dsc);
+
+	void (*dsc_bind_pingpong_blk)(struct dpu_hw_dsc *hw_dsc,
+				  bool enable,
+				  enum dpu_pingpong pp);
  };
struct dpu_hw_dsc {



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