From e7fbff9e7622a00c2b53cb14df481916f0019742 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Fri, 16 Jan 2026 17:33:05 -0500 Subject: [PATCH] drm/amdgpu/soc21: fix xclk for APUs The reference clock is supposed to be 100Mhz, but it appears to actually be slightly lower (99.81Mhz). Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/14451 Reviewed-by: Jesse Zhang Signed-off-by: Alex Deucher (cherry picked from commit 637fee3954d4bd509ea9d95ad1780fc174489860) Cc: stable@vger.kernel.org --- drivers/gpu/drm/amd/amdgpu/soc21.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/soc21.c b/drivers/gpu/drm/amd/amdgpu/soc21.c index ad36c96478a8..25536d89635d 100644 --- a/drivers/gpu/drm/amd/amdgpu/soc21.c +++ b/drivers/gpu/drm/amd/amdgpu/soc21.c @@ -225,7 +225,13 @@ static u32 soc21_get_config_memsize(struct amdgpu_device *adev) static u32 soc21_get_xclk(struct amdgpu_device *adev) { - return adev->clock.spll.reference_freq; + u32 reference_clock = adev->clock.spll.reference_freq; + + /* reference clock is actually 99.81 Mhz rather than 100 Mhz */ + if ((adev->flags & AMD_IS_APU) && reference_clock == 10000) + return 9981; + + return reference_clock; } -- 2.47.3