drm/msm/dpu: Set DATA_COMPRESS on command mode for DCE/DSC 1.2

Add a DPU INTF op to set the DCE_DATA_COMPRESS bit to enable the
DCE/DSC 1.2 datapath

Note: For now, this op is called for command mode encoders only. Changes to
set DATA_COMPRESS for video mode encoders will be posted along with DSC
v1.2 support for DP.

Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Patchwork: https://patchwork.freedesktop.org/patch/541966/
Link: https://lore.kernel.org/r/20230405-add-dsc-support-v6-4-95eab864d1b6@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Author: Jessica Zhang

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

@@ -67,6 +67,9 @@ static void _dpu_encoder_phys_cmd_update_intf_cfg(
 		phys_enc->hw_intf->ops.bind_pingpong_blk(
 				phys_enc->hw_intf,
 				phys_enc->hw_pp->idx);
+
+	if (intf_cfg.dsc != 0 && phys_enc->hw_intf->ops.enable_compression)
+		phys_enc->hw_intf->ops.enable_compression(phys_enc->hw_intf);
 }
 
 static void dpu_encoder_phys_cmd_pp_tx_done_irq(void *arg, int irq_idx)

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

@@ -91,6 +91,7 @@
 
 #define INTF_CFG2_DATABUS_WIDEN	BIT(0)
 #define INTF_CFG2_DATA_HCTL_EN	BIT(4)
+#define INTF_CFG2_DCE_DATA_COMPRESS     BIT(12)
 
 
 static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
@@ -512,6 +513,15 @@ static void dpu_hw_intf_disable_autorefresh(struct dpu_hw_intf *intf,
 
 }
 
+static void dpu_hw_intf_enable_compression(struct dpu_hw_intf *ctx)
+{
+	u32 intf_cfg2 = DPU_REG_READ(&ctx->hw, INTF_CONFIG2);
+
+	intf_cfg2 |= INTF_CFG2_DCE_DATA_COMPRESS;
+
+	DPU_REG_WRITE(&ctx->hw, INTF_CONFIG2, intf_cfg2);
+}
+
 static void _setup_intf_ops(struct dpu_hw_intf_ops *ops,
 		unsigned long cap)
 {
@@ -532,6 +542,9 @@ static void _setup_intf_ops(struct dpu_hw_intf_ops *ops,
 		ops->vsync_sel = dpu_hw_intf_vsync_sel;
 		ops->disable_autorefresh = dpu_hw_intf_disable_autorefresh;
 	}
+
+	if (cap & BIT(DPU_INTF_DATA_COMPRESS))
+		ops->enable_compression = dpu_hw_intf_enable_compression;
 }
 
 struct dpu_hw_intf *dpu_hw_intf_init(const struct dpu_intf_cfg *cfg,

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

@@ -70,6 +70,7 @@ struct intf_status {
  * @get_autorefresh:            Retrieve autorefresh config from hardware
  *                              Return: 0 on success, -ETIMEDOUT on timeout
  * @vsync_sel:                  Select vsync signal for tear-effect configuration
+ * @enable_compression:         Enable data compression
  */
 struct dpu_hw_intf_ops {
 	void (*setup_timing_gen)(struct dpu_hw_intf *intf,
@@ -106,6 +107,8 @@ struct dpu_hw_intf_ops {
 	 * Disable autorefresh if enabled
 	 */
 	void (*disable_autorefresh)(struct dpu_hw_intf *intf, uint32_t encoder_id, u16 vdisplay);
+
+	void (*enable_compression)(struct dpu_hw_intf *intf);
 };
 
 struct dpu_hw_intf {