drm/radeon: add driver option to disable uvd block.

Quite few suspend/hibernation bugs are related to this block. Add
an option to disable those as a work around.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon.h

@@ -113,6 +113,7 @@ extern int radeon_bapm;
 extern int radeon_backlight;
 extern int radeon_auxch;
 extern int radeon_mst;
+extern int radeon_uvd;
 
 /*
  * Copy from radeon_drv.h so we don't have to include both and have conflicting

drivers/gpu/drm/radeon/radeon_asic.c

@@ -2696,6 +2696,9 @@ int radeon_asic_init(struct radeon_device *rdev)
 		rdev->asic->pm.set_memory_clock = NULL;
 	}
 
+	if (!radeon_uvd)
+		rdev->has_uvd = false;
+
 	return 0;
 }
 

drivers/gpu/drm/radeon/radeon_drv.c

@@ -196,6 +196,7 @@ int radeon_bapm = -1;
 int radeon_backlight = -1;
 int radeon_auxch = -1;
 int radeon_mst = 0;
+int radeon_uvd = 1;
 
 MODULE_PARM_DESC(no_wb, "Disable AGP writeback for scratch registers");
 module_param_named(no_wb, radeon_no_wb, int, 0444);
@@ -287,6 +288,9 @@ module_param_named(auxch, radeon_auxch, int, 0444);
 MODULE_PARM_DESC(mst, "DisplayPort MST experimental support (1 = enable, 0 = disable)");
 module_param_named(mst, radeon_mst, int, 0444);
 
+MODULE_PARM_DESC(uvd, "uvd enable/disable uvd support (1 = enable, 0 = disable)");
+module_param_named(uvd, radeon_uvd, int, 0444);
+
 static struct pci_device_id pciidlist[] = {
 	radeon_PCI_IDS
 };