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

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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: Junwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2017-06-30 17:26:47 -04:00
parent 833fa075b8
commit 70d17a25da
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@ -736,7 +736,12 @@ 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))