drm/msm/dpu: separate DSC flush update out of interface

Currently DSC flushing happens during interface configuration at
dpu_hw_ctl_intf_cfg_v1(). Separate DSC flush away from
dpu_hw_ctl_intf_cfg_v1() by adding dpu_hw_ctl_update_pending_flush_dsc_v1()
to handle both per-DSC engine and DSC flush bits at same time to make it
consistent with the location of flush programming of other DPU sub-blocks.

Changes in v10:
-- rewording commit text
-- pass ctl directly instead of dpu_enc to dsc_pipe_cfg()
-- ctx->pending_dsc_flush_mask = 0;

Changes in v11:
-- add Fixes tag

Changes in v12:
-- move dsc parameter to next line at dpu_encoder_dsc_pipe_cfg()

Changes in v14:
-- Fixes tag had been move to 1st patch of this series
Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Patchwork: https://patchwork.freedesktop.org/patch/539506/
Link: https://lore.kernel.org/r/1685036458-22683-9-git-send-email-quic_khsieh@quicinc.comSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c

@@ -1834,7 +1834,8 @@ dpu_encoder_dsc_initial_line_calc(struct drm_dsc_config *dsc,
 	return DIV_ROUND_UP(total_pixels, dsc->slice_width);
 }
 
-static void dpu_encoder_dsc_pipe_cfg(struct dpu_hw_dsc *hw_dsc,
+static void dpu_encoder_dsc_pipe_cfg(struct dpu_hw_ctl *ctl,
+				     struct dpu_hw_dsc *hw_dsc,
 				     struct dpu_hw_pingpong *hw_pp,
 				     struct drm_dsc_config *dsc,
 				     u32 common_mode,
@@ -1854,6 +1855,9 @@ static void dpu_encoder_dsc_pipe_cfg(struct dpu_hw_dsc *hw_dsc,
 
 	if (hw_pp->ops.enable_dsc)
 		hw_pp->ops.enable_dsc(hw_pp);
+
+	if (ctl->ops.update_pending_flush_dsc)
+		ctl->ops.update_pending_flush_dsc(ctl, hw_dsc->idx);
 }
 
 static void dpu_encoder_prep_dsc(struct dpu_encoder_virt *dpu_enc,
@@ -1861,6 +1865,7 @@ static void dpu_encoder_prep_dsc(struct dpu_encoder_virt *dpu_enc,
 {
 	/* coding only for 2LM, 2enc, 1 dsc config */
 	struct dpu_encoder_phys *enc_master = dpu_enc->cur_master;
+	struct dpu_hw_ctl *ctl = enc_master->hw_ctl;
 	struct dpu_hw_dsc *hw_dsc[MAX_CHANNELS_PER_ENC];
 	struct dpu_hw_pingpong *hw_pp[MAX_CHANNELS_PER_ENC];
 	int this_frame_slices;
@@ -1898,7 +1903,8 @@ static void dpu_encoder_prep_dsc(struct dpu_encoder_virt *dpu_enc,
 	initial_lines = dpu_encoder_dsc_initial_line_calc(dsc, enc_ip_w);
 
 	for (i = 0; i < MAX_CHANNELS_PER_ENC; i++)
-		dpu_encoder_dsc_pipe_cfg(hw_dsc[i], hw_pp[i], dsc, dsc_common_mode, initial_lines);
+		dpu_encoder_dsc_pipe_cfg(ctl, hw_dsc[i], hw_pp[i],
+					 dsc, dsc_common_mode, initial_lines);
 }
 
 void dpu_encoder_prepare_for_kickoff(struct drm_encoder *drm_enc)

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c

@@ -103,6 +103,7 @@ static inline void dpu_hw_ctl_clear_pending_flush(struct dpu_hw_ctl *ctx)
 	ctx->pending_intf_flush_mask = 0;
 	ctx->pending_wb_flush_mask = 0;
 	ctx->pending_merge_3d_flush_mask = 0;
+	ctx->pending_dsc_flush_mask = 0;
 
 	memset(ctx->pending_dspp_flush_mask, 0,
 		sizeof(ctx->pending_dspp_flush_mask));
@@ -142,6 +143,11 @@ static inline void dpu_hw_ctl_trigger_flush_v1(struct dpu_hw_ctl *ctx)
 				CTL_DSPP_n_FLUSH(dspp - DSPP_0),
 				ctx->pending_dspp_flush_mask[dspp - DSPP_0]);
 		}
+
+	if (ctx->pending_flush_mask & BIT(DSC_IDX))
+		DPU_REG_WRITE(&ctx->hw, CTL_DSC_FLUSH,
+			      ctx->pending_dsc_flush_mask);
+
 	DPU_REG_WRITE(&ctx->hw, CTL_FLUSH, ctx->pending_flush_mask);
 }
 
@@ -288,6 +294,13 @@ static void dpu_hw_ctl_update_pending_flush_merge_3d_v1(struct dpu_hw_ctl *ctx,
 	ctx->pending_flush_mask |= BIT(MERGE_3D_IDX);
 }
 
+static void dpu_hw_ctl_update_pending_flush_dsc_v1(struct dpu_hw_ctl *ctx,
+						   enum dpu_dsc dsc_num)
+{
+	ctx->pending_dsc_flush_mask |= BIT(dsc_num - DSC_0);
+	ctx->pending_flush_mask |= BIT(DSC_IDX);
+}
+
 static void dpu_hw_ctl_update_pending_flush_dspp(struct dpu_hw_ctl *ctx,
 	enum dpu_dspp dspp, u32 dspp_sub_blk)
 {
@@ -499,9 +512,6 @@ static void dpu_hw_ctl_intf_cfg_v1(struct dpu_hw_ctl *ctx,
 	if ((test_bit(DPU_CTL_VM_CFG, &ctx->caps->features)))
 		mode_sel = CTL_DEFAULT_GROUP_ID  << 28;
 
-	if (cfg->dsc)
-		DPU_REG_WRITE(&ctx->hw, CTL_DSC_FLUSH, cfg->dsc);
-
 	if (cfg->intf_mode_sel == DPU_CTL_MODE_SEL_CMD)
 		mode_sel |= BIT(17);
 
@@ -521,10 +531,9 @@ static void dpu_hw_ctl_intf_cfg_v1(struct dpu_hw_ctl *ctx,
 	if (cfg->merge_3d)
 		DPU_REG_WRITE(c, CTL_MERGE_3D_ACTIVE,
 			      BIT(cfg->merge_3d - MERGE_3D_0));
-	if (cfg->dsc) {
-		DPU_REG_WRITE(&ctx->hw, CTL_FLUSH, BIT(DSC_IDX));
+
+	if (cfg->dsc)
 		DPU_REG_WRITE(c, CTL_DSC_ACTIVE, cfg->dsc);
-	}
 }
 
 static void dpu_hw_ctl_intf_cfg(struct dpu_hw_ctl *ctx,
@@ -627,6 +636,8 @@ static void _setup_ctl_ops(struct dpu_hw_ctl_ops *ops,
 		ops->update_pending_flush_merge_3d =
 			dpu_hw_ctl_update_pending_flush_merge_3d_v1;
 		ops->update_pending_flush_wb = dpu_hw_ctl_update_pending_flush_wb_v1;
+		ops->update_pending_flush_dsc =
+			dpu_hw_ctl_update_pending_flush_dsc_v1;
 	} else {
 		ops->trigger_flush = dpu_hw_ctl_trigger_flush;
 		ops->setup_intf_cfg = dpu_hw_ctl_intf_cfg;

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h

@@ -157,6 +157,15 @@ struct dpu_hw_ctl_ops {
 	void (*update_pending_flush_dspp)(struct dpu_hw_ctl *ctx,
 		enum dpu_dspp blk, u32 dspp_sub_blk);
 
+	/**
+	 * OR in the given flushbits to the cached pending_(dsc_)flush_mask
+	 * No effect on hardware
+	 * @ctx: ctl path ctx pointer
+	 * @blk: interface block index
+	 */
+	void (*update_pending_flush_dsc)(struct dpu_hw_ctl *ctx,
+					 enum dpu_dsc blk);
+
 	/**
 	 * Write the value of the pending_flush_mask to hardware
 	 * @ctx       : ctl path ctx pointer
@@ -229,6 +238,7 @@ struct dpu_hw_ctl_ops {
  * @pending_flush_mask: storage for pending ctl_flush managed via ops
  * @pending_intf_flush_mask: pending INTF flush
  * @pending_wb_flush_mask: pending WB flush
+ * @pending_dsc_flush_mask: pending DSC flush
  * @ops: operation list
  */
 struct dpu_hw_ctl {
@@ -245,6 +255,7 @@ struct dpu_hw_ctl {
 	u32 pending_wb_flush_mask;
 	u32 pending_merge_3d_flush_mask;
 	u32 pending_dspp_flush_mask[DSPP_MAX - DSPP_0];
+	u32 pending_dsc_flush_mask;
 
 	/* ops */
 	struct dpu_hw_ctl_ops ops;