[PATCH v3 04/13] drm/msm/dpu: program master-slave encoders explicitly

[Jeykumar Sankaran]

Identify slave-master encoders and program them explicitly.

changes in v2:
	- none
changes in v3:
	- none

Change-Id: I0ebfada05bd7f8437f842ad860490a678aa8f4cd
Signed-off-by: Jeykumar Sankaran <jsanka at codeaurora.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 39 ++++++++++++++++++-----------
 1 file changed, 24 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 1b4de34..a0ced79 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -184,6 +184,7 @@ struct dpu_encoder_virt {
 	unsigned int num_phys_encs;
 	struct dpu_encoder_phys *phys_encs[MAX_PHYS_ENCODERS_PER_VIRTUAL];
 	struct dpu_encoder_phys *cur_master;
+	struct dpu_encoder_phys *cur_slave;
 	struct dpu_hw_pingpong *hw_pp[MAX_CHANNELS_PER_ENC];
 
 	bool intfs_swapped;
@@ -1153,6 +1154,7 @@ void dpu_encoder_virt_restore(struct drm_encoder *drm_enc)
 static void dpu_encoder_virt_enable(struct drm_encoder *drm_enc)
 {
 	struct dpu_encoder_virt *dpu_enc = NULL;
+	struct dpu_encoder_phys *phys  = NULL;
 	int i, ret = 0;
 	struct drm_display_mode *cur_mode = NULL;
 
@@ -1160,6 +1162,7 @@ static void dpu_encoder_virt_enable(struct drm_encoder *drm_enc)
 		DPU_ERROR("invalid encoder\n");
 		return;
 	}
+
 	dpu_enc = to_dpu_encoder_virt(drm_enc);
 	cur_mode = &dpu_enc->base.crtc->state->adjusted_mode;
 
@@ -1167,21 +1170,36 @@ static void dpu_encoder_virt_enable(struct drm_encoder *drm_enc)
 			     cur_mode->vdisplay);
 
 	dpu_enc->cur_master = NULL;
+	dpu_enc->cur_slave = NULL;
 	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
-		struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
+		phys = dpu_enc->phys_encs[i];
+
+		if (!phys || !phys->ops.is_master)
+			continue;
 
-		if (phys && phys->ops.is_master && phys->ops.is_master(phys)) {
-			DPU_DEBUG_ENC(dpu_enc, "master is now idx %d\n", i);
+		if (phys->ops.is_master(phys)) {
+			DPU_DEBUG_ENC(dpu_enc, "master is at idx %d\n", i);
 			dpu_enc->cur_master = phys;
-			break;
+		} else {
+			DPU_DEBUG_ENC(dpu_enc, "slave is at idx %d\n", i);
+			dpu_enc->cur_slave = phys;
 		}
 	}
 
 	if (!dpu_enc->cur_master) {
-		DPU_ERROR("virt encoder has no master! num_phys %d\n", i);
+		DPU_ERROR("virt encoder has no master identified\n");
 		return;
 	}
 
+	/* always enable slave encoder before master */
+	phys = dpu_enc->cur_slave;
+	if (phys && phys->ops.enable)
+		phys->ops.enable(phys);
+
+	phys = dpu_enc->cur_master;
+	if (phys && phys->ops.enable)
+		phys->ops.enable(phys);
+
 	ret = dpu_encoder_resource_control(drm_enc, DPU_ENC_RC_EVENT_KICKOFF);
 	if (ret) {
 		DPU_ERROR_ENC(dpu_enc, "dpu resource control failed: %d\n",
@@ -1190,25 +1208,16 @@ static void dpu_encoder_virt_enable(struct drm_encoder *drm_enc)
 	}
 
 	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
-		struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
-
+		phys = dpu_enc->phys_encs[i];
 		if (!phys)
 			continue;
 
-		if (phys != dpu_enc->cur_master) {
-			if (phys->ops.enable)
-				phys->ops.enable(phys);
-		}
-
 		if (dpu_enc->misr_enable && (dpu_enc->disp_info.capabilities &
 		     MSM_DISPLAY_CAP_VID_MODE) && phys->ops.setup_misr)
 			phys->ops.setup_misr(phys, true,
 						dpu_enc->misr_frame_count);
 	}
 
-	if (dpu_enc->cur_master->ops.enable)
-		dpu_enc->cur_master->ops.enable(dpu_enc->cur_master);
-
 	_dpu_encoder_virt_enable_helper(drm_enc);
 }
 
-- 
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