If DSC is enabled, the only case is with 2 DSC engines so far. More
usage case will be added, such as 4 DSC in 4:4:2 topoplogy.
So get real number of DSCs to decide whether DSC merge is needed.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h    | 2 ++
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 5 +++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
index b26d5fe40c721..5260e2440f059 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
@@ -202,6 +202,7 @@ struct dpu_crtc {
  * @mixers        : List of active mixers
  * @num_ctls      : Number of ctl paths in use
  * @hw_ctls       : List of active ctl paths
+ * @num_dscs      : Number of DSCs in use
  * @crc_source    : CRC source
  * @crc_frame_skip_count: Number of frames skipped before getting CRC
  */
@@ -223,6 +224,7 @@ struct dpu_crtc_state {
 	u32 num_ctls;
 	struct dpu_hw_ctl *hw_ctls[CRTC_DUAL_MIXERS];
 
+	u32 num_dscs;
 	enum dpu_crtc_crc_source crc_source;
 	int crc_frame_skip_count;
 };
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 6bdd9c21ff3ed..39700b13e92f3 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -548,14 +548,14 @@ bool dpu_encoder_use_dsc_merge(struct drm_encoder *drm_enc)
 {
 	struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
 	int i, intf_count = 0, num_dsc = 0;
+	struct dpu_crtc_state *cstate = to_dpu_crtc_state(drm_enc->crtc->state);
 
 	for (i = 0; i < MAX_PHYS_ENCODERS_PER_VIRTUAL; i++)
 		if (dpu_enc->phys_encs[i])
 			intf_count++;
 
-	/* See dpu_encoder_get_topology, we only support 2:2:1 topology */
 	if (dpu_enc->dsc)
-		num_dsc = 2;
+		num_dsc = cstate->num_dscs;
 
 	return (num_dsc > 0) && (num_dsc > intf_count);
 }
@@ -1169,6 +1169,7 @@ static void dpu_encoder_virt_atomic_mode_set(struct drm_encoder *drm_enc,
 		cstate->mixers[i].hw_dspp = to_dpu_hw_dspp(hw_dspp[i]);
 	}
 
+	cstate->num_dscs = num_dsc;
 	cstate->num_mixers = num_lm;
 
 	dpu_enc->connector = conn_state->connector;

-- 
2.34.1