drm/amd/display: Let drm_crtc_vblank_on/off manage interrupts

[Why]
We manage interrupts for CRTCs in two places:
1. In manage_dm_interrupts(), when CRTC get enabled or disabled
2. When drm_vblank_get/put() starts or kills the vblank counter, calling
   into amdgpu_dm_crtc_set_vblank()

The interrupts managed by these twp places should be identical.

[How]
Since manage_dm_interrupts() already use drm_crtc_vblank_on/off(), just
move all CRTC interrupt management into amdgpu_dm_crtc_set_vblank().

This has the added benefit of disabling all CRTC and HUBP interrupts
when there are no vblank requestors.

Note that there is a TODO item - unchanged from when it was first
introduced - to properly identify the HUBP instance from the OTG
instance, rather than just assume direct mapping.

Signed-off-by: Leo Li <[email protected]>
Reviewed-by: Aurabindo Pillai <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Rodrigo Siqueira <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: leo-sunli1

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -8246,42 +8246,10 @@ static void manage_dm_interrupts(struct amdgpu_device *adev,
 				 struct amdgpu_crtc *acrtc,
 				 bool enable)
 {
-	/*
-	 * We have no guarantee that the frontend index maps to the same
-	 * backend index - some even map to more than one.
-	 *
-	 * TODO: Use a different interrupt or check DC itself for the mapping.
-	 */
-	int irq_type =
-		amdgpu_display_crtc_idx_to_irq_type(
-			adev,
-			acrtc->crtc_id);
-
-	if (enable) {
+	if (enable)
 		drm_crtc_vblank_on(&acrtc->base);
-		amdgpu_irq_get(
-			adev,
-			&adev->pageflip_irq,
-			irq_type);
-#if defined(CONFIG_DRM_AMD_SECURE_DISPLAY)
-		amdgpu_irq_get(
-			adev,
-			&adev->vline0_irq,
-			irq_type);
-#endif
-	} else {
-#if defined(CONFIG_DRM_AMD_SECURE_DISPLAY)
-		amdgpu_irq_put(
-			adev,
-			&adev->vline0_irq,
-			irq_type);
-#endif
-		amdgpu_irq_put(
-			adev,
-			&adev->pageflip_irq,
-			irq_type);
+	else
 		drm_crtc_vblank_off(&acrtc->base);
-	}
 }
 
 static void dm_update_pflip_irq_state(struct amdgpu_device *adev,

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c

@@ -286,11 +286,14 @@ static inline int amdgpu_dm_crtc_set_vblank(struct drm_crtc *crtc, bool enable)
 	struct dm_crtc_state *acrtc_state = to_dm_crtc_state(crtc->state);
 	struct amdgpu_display_manager *dm = &adev->dm;
 	struct vblank_control_work *work;
+	int irq_type;
 	int rc = 0;
 
 	if (acrtc->otg_inst == -1)
 		goto skip;
 
+	irq_type = amdgpu_display_crtc_idx_to_irq_type(adev, acrtc->crtc_id);
+
 	if (enable) {
 		/* vblank irq on -> Only need vupdate irq in vrr mode */
 		if (amdgpu_dm_crtc_vrr_active(acrtc_state))
@@ -303,13 +306,52 @@ static inline int amdgpu_dm_crtc_set_vblank(struct drm_crtc *crtc, bool enable)
 	if (rc)
 		return rc;
 
-	rc = (enable)
-		? amdgpu_irq_get(adev, &adev->crtc_irq, acrtc->crtc_id)
-		: amdgpu_irq_put(adev, &adev->crtc_irq, acrtc->crtc_id);
+	/* crtc vblank or vstartup interrupt */
+	if (enable) {
+		rc = amdgpu_irq_get(adev, &adev->crtc_irq, irq_type);
+		drm_dbg_vbl(crtc->dev, "Get crtc_irq ret=%d\n", rc);
+	} else {
+		rc = amdgpu_irq_put(adev, &adev->crtc_irq, irq_type);
+		drm_dbg_vbl(crtc->dev, "Put crtc_irq ret=%d\n", rc);
+	}
 
 	if (rc)
 		return rc;
 
+	/*
+	 * hubp surface flip interrupt
+	 *
+	 * We have no guarantee that the frontend index maps to the same
+	 * backend index - some even map to more than one.
+	 *
+	 * TODO: Use a different interrupt or check DC itself for the mapping.
+	 */
+	if (enable) {
+		rc = amdgpu_irq_get(adev, &adev->pageflip_irq, irq_type);
+		drm_dbg_vbl(crtc->dev, "Get pageflip_irq ret=%d\n", rc);
+	} else {
+		rc = amdgpu_irq_put(adev, &adev->pageflip_irq, irq_type);
+		drm_dbg_vbl(crtc->dev, "Put pageflip_irq ret=%d\n", rc);
+	}
+
+	if (rc)
+		return rc;
+
+#if defined(CONFIG_DRM_AMD_SECURE_DISPLAY)
+	/* crtc vline0 interrupt, only available on DCN+ */
+	if (amdgpu_ip_version(adev, DCE_HWIP, 0) != 0) {
+		if (enable) {
+			rc = amdgpu_irq_get(adev, &adev->vline0_irq, irq_type);
+			drm_dbg_vbl(crtc->dev, "Get vline0_irq ret=%d\n", rc);
+		} else {
+			rc = amdgpu_irq_put(adev, &adev->vline0_irq, irq_type);
+			drm_dbg_vbl(crtc->dev, "Put vline0_irq ret=%d\n", rc);
+		}
+
+		if (rc)
+			return rc;
+	}
+#endif
 skip:
 	if (amdgpu_in_reset(adev))
 		return 0;