drm/amdgpu: Put enable gfx off feature to a delay thread

delay to enable gfx off feature to avoid gfx on/off frequently
suggested by Alex and Evan.

Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
index 1cdb26471a03..11d4d9f93b95 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
@@ -26,6 +26,9 @@
 #include "amdgpu.h"
 #include "amdgpu_gfx.h"
 
+/* 0.5 second timeout */
+#define GFX_OFF_DELAY_ENABLE         msecs_to_jiffies(500)
+
 /*
  * GPU scratch registers helpers function.
  */
@@ -360,6 +363,7 @@ void amdgpu_gfx_off_ctrl(struct amdgpu_device *adev, bool enable)
         if (!adev->powerplay.pp_funcs->set_powergating_by_smu)
                 return;
 
+
         mutex_lock(&adev->gfx.gfx_off_mutex);
 
         if (!enable)
@@ -368,11 +372,11 @@ void amdgpu_gfx_off_ctrl(struct amdgpu_device *adev, bool enable)
                 adev->gfx.gfx_off_req_count--;
 
         if (enable && !adev->gfx.gfx_off_state && !adev->gfx.gfx_off_req_count) {
-                if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, true))
-                        adev->gfx.gfx_off_state = true;
+                schedule_delayed_work(&adev->gfx.gfx_off_delay_work, GFX_OFF_DELAY_ENABLE);
         } else if (!enable && adev->gfx.gfx_off_state) {
                 if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, false))
                         adev->gfx.gfx_off_state = false;
         }
+
         mutex_unlock(&adev->gfx.gfx_off_mutex);
 }