[PATCH] drm/amd/display: Enable VM support only on APUs newer than CZ

[Harry Wentland]

On 2017-10-30 02:00 PM, Christian König wrote:
> Am 30.10.2017 um 18:41 schrieb Harry Wentland:
>> VM support is only available for CZ and newer APUs. Trying to
>> enable it for dGPU will blow up in DC.
>>
>> Signed-off-by: Harry Wentland <harry.wentland at amd.com>
>> Suggested-by: Alex Deucher <alexander.deucher at amd.com>
>> CC: Christian Koenig <christian.koenig at amd.com>
> 
> Ok, with me. But I think it would be cleaner if the backend can just handle this gracefully even when it is not supported by the hardware.
> 

Yes, I think we're all agreed on this. I just thought I'd send out something because it looked like it might be urgent. This is kind-of unplanned work for me and not on top of my list with everything else that's happening right now.

Harry

> Christian.
> 
>> ---
>>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> index 26f6d5e4c08c..332761f643f6 100644
>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> @@ -427,6 +427,10 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
>>           amdgpu_dm_initialize_fbc(adev);
>>       init_data.fbc_gpu_addr = adev->dm.compressor.gpu_addr;
>>   #endif
>> +
>> +    if (adev->flags & AMD_IS_APU && adev->asic_type >= CHIP_CARRIZO)
>> +        init_data.flags.gpu_vm_support = true;
>> +
>>       /* Display Core create. */
>>       adev->dm.dc = dc_create(&init_data);
>>   
> 
>