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drm/amdgpu: fix NAK-G generation during PCI-e link width switch

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A lot of NAK-G being generated when link widht switching is happening.
WA for this issue is to program the SPC to 4 symbols per clock during
bootup when the native PCIE width is x4.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Evan Quan
2021-05-25 12:08:53 +08:00
committed by Alex Deucher
parent 9c26ddb1c5
commit 5a5da8ae95
3 changed files with 32 additions and 0 deletions
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drivers/gpu/drm/amd/amdgpu/amdgpu_nbio.h
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@@ -93,6 +93,7 @@ struct amdgpu_nbio_funcs {
void (*enable_aspm)(struct amdgpu_device *adev,
bool enable);
void (*program_aspm)(struct amdgpu_device *adev);
void (*apply_lc_spc_mode_wa)(struct amdgpu_device *adev);
};
struct amdgpu_nbio {