From: Chia-I Wu <olvaffe@xxxxxxxxx>
commit b447b079cf3a9971ea4d31301e673f49612ccc18 upstream.
According to Alex, most APUs from that time seem to have the same issue
(vbios says 48Mhz, actual is 100Mhz). I only have a CHIP_STONEY so I
limit the fixup to CHIP_STONEY
Signed-off-by: Chia-I Wu <olvaffe@xxxxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/vi.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/amd/amdgpu/vi.c
+++ b/drivers/gpu/drm/amd/amdgpu/vi.c
@@ -542,8 +542,15 @@ static u32 vi_get_xclk(struct amdgpu_dev
u32 reference_clock = adev->clock.spll.reference_freq;
u32 tmp;
- if (adev->flags & AMD_IS_APU)
- return reference_clock;
+ if (adev->flags & AMD_IS_APU) {
+ switch (adev->asic_type) {
+ case CHIP_STONEY:
+ /* vbios says 48Mhz, but the actual freq is 100Mhz */
+ return 10000;
+ default:
+ return reference_clock;
+ }
+ }
tmp = RREG32_SMC(ixCG_CLKPIN_CNTL_2);
if (REG_GET_FIELD(tmp, CG_CLKPIN_CNTL_2, MUX_TCLK_TO_XCLK))
