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

[Deucher, Alexander]

[AMD Public Use]

Is the xclk really 25 Mhz or is there some divider for the fan stuff?  Changing the xclk value will affect other places where this is used.

Alex

________________________________
From: Chen, Guchun <Guchun.Chen at amd.com>
Sent: Tuesday, January 26, 2021 11:33 PM
To: Quan, Evan <Evan.Quan at amd.com>; Alex Deucher <alexdeucher at gmail.com>; amd-gfx at lists.freedesktop.org <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 Public Use]

In soc15_get_xclk, we have independent handling for CHIP_RAVEN case.

If (adev->asic_type == CHIP_RAVEN)
        return reference_clock / 4;

I am not sure if it's better to squash the patch into the asic specific function? Then we have one unified place to handle it.

Regards,
Guchun

-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Quan, Evan
Sent: Wednesday, January 27, 2021 11:46 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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