[PATCH 2/2] drm/amdgpu/nbio7.4: add hw bug workaround for vega20

[Yang, Philip]

This series are verified on 4 Vega20 by: Philip Yang <Philip.Yang at amd.com>

On 2018-12-20 10:39 a.m., Kasiviswanathan, Harish wrote:
> This patch set Reviewed-by: Harish Kasiviswanathan
> <Harish.Kasiviswanathan at amd.com>
> 
> On 2018-12-19 6:09 p.m., Alex Deucher wrote:
>> Configure PCIE_CI_CNTL to work around a hw bug that affects
>> some multi-GPU compute workloads.
>>
>> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
>> ---
>>    drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c | 7 +++++++
>>    1 file changed, 7 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c b/drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c
>> index f8cee95d61cc..4cd31a276dcd 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c
>> @@ -31,6 +31,7 @@
>>    
>>    #define smnCPM_CONTROL                                                                                  0x11180460
>>    #define smnPCIE_CNTL2                                                                                   0x11180070
>> +#define smnPCIE_CI_CNTL                                                                                 0x11180080
>>    
>>    static u32 nbio_v7_4_get_rev_id(struct amdgpu_device *adev)
>>    {
>> @@ -222,7 +223,13 @@ static void nbio_v7_4_detect_hw_virt(struct amdgpu_device *adev)
>>    
>>    static void nbio_v7_4_init_registers(struct amdgpu_device *adev)
>>    {
>> +	uint32_t def, data;
>> +
>> +	def = data = RREG32_PCIE(smnPCIE_CI_CNTL);
>> +	data = REG_SET_FIELD(data, PCIE_CI_CNTL, CI_SLV_ORDERING_DIS, 1);
>>    
>> +	if (def != data)
>> +		WREG32_PCIE(smnPCIE_CI_CNTL, data);
>>    }
>>    
>>    const struct amdgpu_nbio_funcs nbio_v7_4_funcs = {
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