The xclk needs to be divided by 4.
Fixes: acab02c1af43d3 ("drm/amdgpu/pm/smu11: Fix fan set speed bug")
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c
index 147efe12973c..36dac106ed4b 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c
@@ -1245,7 +1245,11 @@ int smu_v11_0_get_fan_speed_rpm(struct smu_context *smu,
if (!tach_period)
return -EINVAL;
- crystal_clock_freq = amdgpu_asic_get_xclk(adev);
+ /*
+ * crystal_clock_freq div by 4 is required since the fan control
+ * module refers to 25MHz
+ */
+ crystal_clock_freq = amdgpu_asic_get_xclk(adev) / 4;
tmp64 = (uint64_t)crystal_clock_freq * 60 * 10000;
do_div(tmp64, (tach_period * 8));
--
2.29.2
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