drm/amdgpu: During s0ix don't wait to signal GFXOFF

In the rare event when GFX IP suspend coincides with a s0ix entry, don't
schedule a delayed work, instead signal PMFW immediately to allow GFXOFF
entry. GFXOFF is a prerequisite for s0ix entry. PMFW needs to be
signaled about GFXOFF status before amd-pmc module passes OS HINT
to PMFW telling that everything is ready for a safe s0ix entry.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1712

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciell@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
index e7f06bd..1916ec8 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
@@ -31,6 +31,8 @@
 /* delay 0.1 second to enable gfx off feature */
 #define GFX_OFF_DELAY_ENABLE         msecs_to_jiffies(100)
 
+#define GFX_OFF_NO_DELAY 0
+
 /*
  * GPU GFX IP block helpers function.
  */
@@ -558,6 +560,8 @@ int amdgpu_gfx_enable_kcq(struct amdgpu_device *adev)
 
 void amdgpu_gfx_off_ctrl(struct amdgpu_device *adev, bool enable)
 {
+       unsigned long delay = GFX_OFF_DELAY_ENABLE;
+
        if (!(adev->pm.pp_feature & PP_GFXOFF_MASK))
                return;
 
@@ -573,8 +577,14 @@ void amdgpu_gfx_off_ctrl(struct amdgpu_device *adev, bool enable)
 
                adev->gfx.gfx_off_req_count--;
 
-               if (adev->gfx.gfx_off_req_count == 0 && !adev->gfx.gfx_off_state)
-                       schedule_delayed_work(&adev->gfx.gfx_off_delay_work, GFX_OFF_DELAY_ENABLE);
+               if (adev->gfx.gfx_off_req_count == 0 &&
+                   !adev->gfx.gfx_off_state) {
+                       /* If going to s2idle, no need to wait */
+                       if (adev->in_s0ix)
+                               delay = GFX_OFF_NO_DELAY;
+                       schedule_delayed_work(&adev->gfx.gfx_off_delay_work,
+                                             delay);
+               }
        } else {
                if (adev->gfx.gfx_off_req_count == 0) {
                        cancel_delayed_work_sync(&adev->gfx.gfx_off_delay_work);