[PATCH 16/16] drm/amd/display: Fix s3 hang on resume.

[Harry Wentland]

From: Andrey Grodzovsky <Andrey.Grodzovsky at amd.com>

Avoid enabling CRTC_VERTICAL_INTERRUPT0 twice on resume.
It's enabled once from within manage_dm_interrupts in mode set
and another explicitly from amdgpu_dm_irq_resume_late.
Seems it lead to CRTC hang.

Change-Id: I7d7f29adb0f204fd6b1b2a9b36111cd2cf5bf820
Signed-off-by: Andrey Grodzovsky <Andrey.Grodzovsky at amd.com>
Acked-by: Harry Wentland <Harry.Wentland at amd.com>
Reviewed-by: Andrey Grodzovsky <Andrey.Grodzovsky at amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c     |  2 +-
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c | 16 +++++++++++-----
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.h |  2 +-
 3 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index b3a9a9058c4a..62be159b1ea5 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -581,7 +581,7 @@ int amdgpu_dm_display_resume(struct amdgpu_device *adev )
 
 	ret = drm_atomic_helper_resume(ddev, adev->dm.cached_state);
 
-	amdgpu_dm_irq_resume(adev);
+	amdgpu_dm_irq_resume_late(adev);
 
 	return ret;
 }
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
index 682e9c3ad8e5..4aee146a848f 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
@@ -504,8 +504,11 @@ int amdgpu_dm_irq_suspend(
 
 	DRM_DEBUG_KMS("DM_IRQ: suspend\n");
 
-	/* disable HW interrupt */
-	for (src = DC_IRQ_SOURCE_HPD1; src < DAL_IRQ_SOURCES_NUMBER; src++) {
+	/**
+	 * Disable HW interrupt  for HPD and HPDRX only since FLIP and VBLANK
+	 * will be disabled from manage_dm_interrupts on disable CRTC.
+	 */
+	for (src = DC_IRQ_SOURCE_HPD1; src < DC_IRQ_SOURCE_HPD6RX; src++) {
 		hnd_list_l = &adev->dm.irq_handler_list_low_tab[src].head;
 		hnd_list_h = &adev->dm.irq_handler_list_high_tab[src];
 		if (!list_empty(hnd_list_l) || !list_empty(hnd_list_h))
@@ -544,7 +547,7 @@ int amdgpu_dm_irq_resume_early(struct amdgpu_device *adev)
 	return 0;
 }
 
-int amdgpu_dm_irq_resume(struct amdgpu_device *adev)
+int amdgpu_dm_irq_resume_late(struct amdgpu_device *adev)
 {
 	int src;
 	struct list_head *hnd_list_h, *hnd_list_l;
@@ -554,8 +557,11 @@ int amdgpu_dm_irq_resume(struct amdgpu_device *adev)
 
 	DRM_DEBUG_KMS("DM_IRQ: resume\n");
 
-	/* re-enable HW interrupt */
-	for (src = DC_IRQ_SOURCE_HPD1; src < DAL_IRQ_SOURCES_NUMBER; src++) {
+	/**
+	 * Renable HW interrupt  for HPD and only since FLIP and VBLANK
+	 * will be enabled from manage_dm_interrupts on enable CRTC.
+	 */
+	for (src = DC_IRQ_SOURCE_HPD1; src < DC_IRQ_SOURCE_HPD6; src++) {
 		hnd_list_l = &adev->dm.irq_handler_list_low_tab[src].head;
 		hnd_list_h = &adev->dm.irq_handler_list_high_tab[src];
 		if (!list_empty(hnd_list_l) || !list_empty(hnd_list_h))
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.h
index 9339861c8897..9d3007634266 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.h
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.h
@@ -117,6 +117,6 @@ int amdgpu_dm_irq_suspend(struct amdgpu_device *adev);
  *
  */
 int amdgpu_dm_irq_resume_early(struct amdgpu_device *adev);
-int amdgpu_dm_irq_resume(struct amdgpu_device *adev);
+int amdgpu_dm_irq_resume_late(struct amdgpu_device *adev);
 
 #endif /* __AMDGPU_DM_IRQ_H__ */
-- 
2.11.0