[PATCH] drm/amdgpu: check scratch registers to see if we need post (v2)

[Alex Deucher]

Rather than checking the CONGIG_MEMSIZE register as that may
not be reliable on some APUs.

v2: The scratch register is only used on CIK+

Reviewed-by: Christian König <christian.koenig at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 63f4bed..8042a8a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -722,7 +722,12 @@ bool amdgpu_need_post(struct amdgpu_device *adev)
 		adev->has_hw_reset = false;
 		return true;
 	}
-	/* then check MEM_SIZE, in case the crtcs are off */
+
+	/* bios scratch used on CIK+ */
+	if (adev->asic_type >= CHIP_BONAIRE)
+		return amdgpu_atombios_scratch_need_asic_init(adev);
+
+	/* check MEM_SIZE for older asics */
 	reg = amdgpu_asic_get_config_memsize(adev);
 
 	if ((reg != 0) && (reg != 0xffffffff))
-- 
2.5.5