[PATCH] drm/amdgpu/pm/smu11: fix static fan speed readback

[Lazar, Lijo]

[AMD Public Use]

As crystal clock is not guaranteed to be 100M always, it's better to hardcode to 25M.

Thanks,
Lijo 

-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Quan, Evan
Sent: Wednesday, January 27, 2021 9:16 AM
To: Alex Deucher <alexdeucher at gmail.com>; amd-gfx at lists.freedesktop.org
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>
Subject: RE: [PATCH] drm/amdgpu/pm/smu11: fix static fan speed readback

[AMD Official Use Only - Internal Distribution Only]

[AMD Official Use Only - Internal Distribution Only]

Actually after switching to retrieve fan speed from metrics table always, this API is not used any more.
Maybe we can just drop it. Either way the patch is reviewed-by: Evan Quan <evan.quan at amd.com>

BR
Evan
-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Alex Deucher
Sent: Wednesday, January 27, 2021 2:17 AM
To: amd-gfx at lists.freedesktop.org
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>
Subject: [PATCH] drm/amdgpu/pm/smu11: fix static fan speed readback

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 at amd.com>
---
 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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