[PATCH 1/2] drm/amdgpu: skip to program GFXDEC registers for suspend abort

[Prike Liang]

In the suspend abort cases, the gfx power rail doesn't turn off so
some GFXDEC registers/CSB can't reset to default value and at this
moment reinitialize GFXDEC/CSB will result in an unexpected error.
So let skip those program sequence for the suspend abort case.

Signed-off-by: Prike Liang <prike.li...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h     | 2 ++
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 2 ++
 drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c   | 8 ++++++++
 3 files changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h 
b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index c5f3859fd682..312dfaec7b4a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1079,6 +1079,8 @@ struct amdgpu_device {
        bool                            in_s3;
        bool                            in_s4;
        bool                            in_s0ix;
+       /* indicate amdgpu suspension status */
+       bool                            suspend_complete;
 
        enum pp_mp1_state               mp1_state;
        struct amdgpu_doorbell_index doorbell_index;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 475bd59c9ac2..59254144916c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -2472,6 +2472,7 @@ static int amdgpu_pmops_suspend(struct device *dev)
        struct drm_device *drm_dev = dev_get_drvdata(dev);
        struct amdgpu_device *adev = drm_to_adev(drm_dev);
 
+       adev->suspend_complete = false;
        if (amdgpu_acpi_is_s0ix_active(adev))
                adev->in_s0ix = true;
        else if (amdgpu_acpi_is_s3_active(adev))
@@ -2486,6 +2487,7 @@ static int amdgpu_pmops_suspend_noirq(struct device *dev)
        struct drm_device *drm_dev = dev_get_drvdata(dev);
        struct amdgpu_device *adev = drm_to_adev(drm_dev);
 
+       adev->suspend_complete = true;
        if (amdgpu_acpi_should_gpu_reset(adev))
                return amdgpu_asic_reset(adev);
 
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c 
b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 57808be6e3ec..169d45268ef6 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -3034,6 +3034,14 @@ static int gfx_v9_0_cp_gfx_start(struct amdgpu_device 
*adev)
 
        gfx_v9_0_cp_gfx_enable(adev, true);
 
+       /* Now only limit the quirk on the APU gfx9 series and already
+        * confirmed that the APU gfx10/gfx11 needn't such update.
+        */
+       if (adev->flags & AMD_IS_APU &&
+                       adev->in_s3 && !adev->suspend_complete) {
+               DRM_INFO(" Will skip the CSB packet resubmit\n");
+               return 0;
+       }
        r = amdgpu_ring_alloc(ring, gfx_v9_0_get_csb_size(adev) + 4 + 3);
        if (r) {
                DRM_ERROR("amdgpu: cp failed to lock ring (%d).\n", r);
-- 
2.34.1