drm/amd/pm: update the LC_L1_INACTIVITY setting to address possible noise issue

It is proved that insufficient LC_L1_INACTIVITY setting can cause audio
noise on some platform. With the LC_L1_INACTIVITY increased to 4ms, the
issue can be resolved.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/nbio_v2_3.c b/drivers/gpu/drm/amd/amdgpu/nbio_v2_3.c
index 7ba47fc..4038455 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/nbio_v2_3.c
+++ b/drivers/gpu/drm/amd/amdgpu/nbio_v2_3.c
@@ -345,7 +345,7 @@ static void nbio_v2_3_init_registers(struct amdgpu_device *adev)
 }
 
 #define NAVI10_PCIE__LC_L0S_INACTIVITY_DEFAULT         0x00000000 // off by default, no gains over L1
-#define NAVI10_PCIE__LC_L1_INACTIVITY_DEFAULT          0x00000009 // 1=1us, 9=1ms
+#define NAVI10_PCIE__LC_L1_INACTIVITY_DEFAULT          0x0000000A // 1=1us, 9=1ms, 10=4ms
 #define NAVI10_PCIE__LC_L1_INACTIVITY_TBT_DEFAULT      0x0000000E // 400ms
 
 static void nbio_v2_3_enable_aspm(struct amdgpu_device *adev,