drm/amdgpu: Fix resume failures when device is gone

Problem:
When device goes into suspend and unplugged during it
then all HW programming during resume fails leading
to a bad SW during pci remove handling which follows.
Because device is first resumed and only later removed
we cannot rely on drm_dev_enter/exit here.

Fix:
Use a flag we use for PCIe error recovery to avoid
accessing registres. This allows to successfully complete
pm resume sequence and finish pci remove.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index f18240f..15b27bc 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -1508,6 +1508,10 @@ static int amdgpu_pmops_resume(struct device *dev)
        struct amdgpu_device *adev = drm_to_adev(drm_dev);
        int r;
 
+       /* Avoids registers access if device is physically gone */
+       if (!pci_device_is_present(adev->pdev))
+               adev->no_hw_access = true;
+
        r = amdgpu_device_resume(drm_dev, true);
        if (amdgpu_acpi_is_s0ix_active(adev))
                adev->in_s0ix = false;