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drm/amdgpu: fix xclk freq on CHIP_STONEY 

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@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Chia-I Wu 2023-06-01 14:48:08 -07:00 committed by Alex Deucher
parent 982b173a6c
commit b447b079cf
1 changed files with 9 additions and 2 deletions
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11
drivers/gpu/drm/amd/amdgpu/vi.c
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@ -542,8 +542,15 @@ static u32 vi_get_xclk(struct amdgpu_device *adev)
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))