disp: msm: sde: null check for pp hw before encoder mode set

During encoder modeset, driver does not check for ping pong hw
before going through with mode set. This change updates the check
at the encoder mode set and adds a check at the encoder wait
for irq.

Change-Id: If27faa29ee29040808473e44994f42c36980a45e
Signed-off-by: Nilaan Gunabalachandran <ngunabal@codeaurora.org>

msm/sde/sde_encoder.c

@@ -381,7 +381,7 @@ int sde_encoder_helper_wait_for_irq(struct sde_encoder_phys *phys_enc,
 	u32 irq_status;
 	int ret, i;
 
-	if (!phys_enc || !wait_info || intr_idx >= INTR_IDX_MAX) {
+	if (!phys_enc || !phys_enc->hw_pp || !wait_info || intr_idx >= INTR_IDX_MAX) {
 		SDE_ERROR("invalid params\n");
 		return -EINVAL;
 	}
@@ -2529,10 +2529,10 @@ static void sde_encoder_virt_mode_set(struct drm_encoder *drm_enc,
 		struct sde_encoder_phys *phys = sde_enc->phys_encs[i];
 
 		if (phys) {
-			if (!sde_enc->hw_pp[i * num_pp_per_intf] &&
+			if (!sde_enc->hw_pp[i * num_pp_per_intf] ||
 				sde_enc->topology.num_intf) {
-				SDE_ERROR_ENC(sde_enc, "invalid hw_pp[%d]\n",
-						i * num_pp_per_intf);
+				SDE_ERROR_ENC(sde_enc, "invalid phys %d pp_per_intf %d num_intf %d",
+						i, num_pp_per_intf, sde_enc->topology.num_intf);
 				return;
 			}
 			phys->hw_pp = sde_enc->hw_pp[i * num_pp_per_intf];