disp: msm: sde: disable hw-fencing for commit before vm transition

This change disables hw-fencing for the last commit before
vm transition. This avoids configuration issues if hw-fencing is
disabled in the incoming VM.

Change-Id: I573b7d1665f8cef442168bd0ab83a4b2b6cebbb6
Signed-off-by: Christina Oliveira <quic_coliveir@quicinc.com>

msm/sde/sde_crtc.c

@@ -3855,6 +3855,8 @@ static bool _sde_crtc_wait_for_fences(struct drm_crtc *crtc)
 	bool input_hw_fences_enable;
 	struct sde_kms *sde_kms = _sde_crtc_get_kms(crtc);
 	int ret;
+	enum sde_crtc_vm_req vm_req;
+	bool disable_hw_fences = false;
 
 	SDE_DEBUG("\n");
 
@@ -3866,10 +3868,15 @@ static bool _sde_crtc_wait_for_fences(struct drm_crtc *crtc)
 
 	SDE_ATRACE_BEGIN("plane_wait_input_fence");
 
+	/* if this is the last frame on vm transition, disable hw fences */
+	vm_req = sde_crtc_get_property(to_sde_crtc_state(crtc->state), CRTC_PROP_VM_REQ_STATE);
+	if (vm_req == VM_REQ_RELEASE)
+		disable_hw_fences = true;
+
 	/* update ctl hw to wait for ipcc input signal before fetch */
 	if (test_bit(HW_FENCE_IN_FENCES_ENABLE, sde_crtc->hwfence_features_mask) &&
 			!sde_fence_update_input_hw_fence_signal(hw_ctl, sde_kms->debugfs_hw_fence,
-			sde_kms->hw_mdp))
+			sde_kms->hw_mdp, disable_hw_fences))
 		ipcc_input_signal_wait = true;
 
 	/* avoid hw-fences in first frame after timing engine enable */

msm/sde/sde_fence.c

@@ -469,7 +469,7 @@ static int _reset_hw_fence_timeline(struct sde_hw_ctl *hw_ctl, u32 flags)
 }
 
 int sde_fence_update_input_hw_fence_signal(struct sde_hw_ctl *hw_ctl, u32 debugfs_hw_fence,
-		struct sde_hw_mdp *hw_mdp)
+		struct sde_hw_mdp *hw_mdp, bool disable)
 {
 	struct sde_hw_fence_data *data;
 	u32 ipcc_signal_id;
@@ -486,6 +486,11 @@ int sde_fence_update_input_hw_fence_signal(struct sde_hw_ctl *hw_ctl, u32 debugf
 	ctl_id = hw_ctl->idx - CTL_0;
 	data = &hw_ctl->hwfence_data;
 
+	if (disable) {
+		hw_ctl->ops.hw_fence_ctrl(hw_ctl, false, false, 0);
+		return -EPERM;
+	}
+
 	if ((debugfs_hw_fence & SDE_INPUT_HW_FENCE_TIMESTAMP)
 			&& hw_mdp->ops.hw_fence_input_timestamp_ctrl)
 		hw_mdp->ops.hw_fence_input_timestamp_ctrl(hw_mdp, true, false);

msm/sde/sde_fence.h

@@ -192,11 +192,12 @@ int sde_fence_update_hw_fences_txq(struct sde_fence_context *ctx, bool vid_mode,
  * @ctl: hw ctl to update the input-fence and enable hw-fences
  * @debugfs_hw_fence: hw-fence timestamp debugfs value
  * @hw_mdp: pointer to hw_mdp to get timestamp registers
+ * @disable: bool to indicate if we should disable hw-fencing for this commit
  *
  * Returns: Zero on success, otherwise returns an error code.
  */
 int sde_fence_update_input_hw_fence_signal(struct sde_hw_ctl *ctl, u32 debugfs_hw_fence,
-	struct sde_hw_mdp *hw_mdp);
+	struct sde_hw_mdp *hw_mdp, bool disable);
 
 /**
  * sde_fence_deinit - deinit fence container

msm/sde/sde_hw_ctl.c

@@ -365,7 +365,12 @@ static inline void sde_hw_ctl_hw_fence_ctrl(struct sde_hw_ctl *ctx, bool sw_over
 	u32 val;
 
 	val = SDE_REG_READ(&ctx->hw, CTL_HW_FENCE_CTRL);
-	val |= (0x1 & mode) | (sw_override_set ? BIT(5) : 0) | (sw_override_clear ? BIT(4) : 0);
+	val |= (sw_override_set ? BIT(5) : 0) | (sw_override_clear ? BIT(4) : 0);
+	if (!mode)
+		val &= ~BIT(0);
+	else
+		val |= BIT(0);
+
 	SDE_REG_WRITE(&ctx->hw, CTL_HW_FENCE_CTRL, val);
 }