[PATCH] drm/amd/pm: fix the wrong fan speed in fan1_input

Alex Deucher alexdeucher at gmail.com
Thu Oct 22 05:05:29 UTC 2020 

On Thu, Oct 22, 2020 at 1:01 AM Feng, Kenneth <Kenneth.Feng at amd.com> wrote:
>
> [AMD Official Use Only - Internal Distribution Only]
>
> Hi Alex,
> The speed is not 0 in the below scenario if the rpm is got from the metrics table on navi10.
> The possibility is that you were using an old firmware. The firmware on my system is 0x002a3e00
> Can you remember the version when you saw the problem?

SMC feature version: 0, firmware version: 0x002a3600

Alex

> Thanks.
> # echo 1 > devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00.0/hwmon/hwmon3/pwm1_enable
> # echo 125 > devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00.0/hwmon/hwmon3/pwm1
> # cat devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00.0/hwmon/hwmon3/pwm1
> 109
>
>
>
>
>
>
> -----Original Message-----
> From: Alex Deucher <alexdeucher at gmail.com>
> Sent: Thursday, October 22, 2020 11:28 AM
> To: Feng, Kenneth <Kenneth.Feng at amd.com>
> Cc: amd-gfx list <amd-gfx at lists.freedesktop.org>; Gao, Likun <Likun.Gao at amd.com>
> Subject: Re: [PATCH] drm/amd/pm: fix the wrong fan speed in fan1_input
>
> [CAUTION: External Email]
>
> On Wed, Oct 21, 2020 at 11:16 PM Feng, Kenneth <Kenneth.Feng at amd.com> wrote:
> >
> > [AMD Official Use Only - Internal Distribution Only]
> >
> > Hi Alex,
> > After reboot, It is also not read back correctly as below.
> > # echo 1 >
> > devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00.0
> > /hwmon/hwmon3/fan1_enable s# cat
> > devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00.0
> > /hwmon/hwmon3/fan1_input
> > 183105
> > # cat
> > devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00.0
> > /hwmon/hwmon3/fan1_enable
> > 1
> >
>
> What about if you manually set the speed.  E.g., # echo 1 > devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00.0/hwmon/hwmon3/fan1_enable
> # echo 800 > devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00.0/hwmon/hwmon3/fan1_target
> # cat devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00.0/hwmon/hwmon3/fan1_input
>
> The problem I ran into on navi1x was setting the fan speed manually resulted in 0 for the fan speed in the metrics table.  E.g.,
>
> # echo 1 > devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00.0/hwmon/hwmon3/pwm1_enable
> # echo 125 > devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00.0/hwmon/hwmon3/pwm1
> # cat devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00.0/hwmon/hwmon3/pwm
>
> See:
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.freedesktop.org%2Fdrm%2Famd%2F-%2Fissues%2F1164&data=04%7C01%7CKenneth.Feng%40amd.com%7Cfdef2561887a41322e2a08d8763a897b%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637389341097409110%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=M6EIZVH9vxUJw0d5eh%2B6VzYKQ0LEOwMRdAaEYzrU1d8%3D&reserved=0
>
> Alex
>
>
> >
> >
> > -----Original Message-----
> > From: Alex Deucher <alexdeucher at gmail.com>
> > Sent: Thursday, October 22, 2020 10:18 AM
> > To: Feng, Kenneth <Kenneth.Feng at amd.com>
> > Cc: amd-gfx list <amd-gfx at lists.freedesktop.org>; Gao, Likun
> > <Likun.Gao at amd.com>
> > Subject: Re: [PATCH] drm/amd/pm: fix the wrong fan speed in fan1_input
> >
> > [CAUTION: External Email]
> >
> > On Wed, Oct 21, 2020 at 9:30 PM Feng, Kenneth <Kenneth.Feng at amd.com> wrote:
> > >
> > > [AMD Official Use Only - Internal Distribution Only]
> > >
> > > Hi Alex,
> > > Navi10 also has this problem as below.
> > > # cat
> > > devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00
> > > .0
> > > /hwmon/hwmon3/fan1_input
> > > 1217
> > > # cat
> > > devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00
> > > .0
> > > /hwmon/hwmon3/fan1_enable
> > > 0
> > > # echo 1 >
> > > devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00
> > > .0
> > > /hwmon/hwmon3/fan1_enable # cat
> > > devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00
> > > .0
> > > /hwmon/hwmon3/fan1_enable
> > > 1
> > > s# cat
> > > devices/pci0000:00/0000:00:01.1/0000:02:00.0/0000:03:00.0/0000:04:00
> > > .0
> > > /hwmon/hwmon3/fan1_input
> > > 183105
> > >
> > > In AGM, the rpm is 1800.
> >
> > Does it read back correctly if you manually set the fan rpm first before reading it back?
> >
> > Alex
> >
> >
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: Feng, Kenneth
> > > Sent: Thursday, October 22, 2020 9:11 AM
> > > To: Alex Deucher <alexdeucher at gmail.com>
> > > Cc: amd-gfx list <amd-gfx at lists.freedesktop.org>; Gao, Likun
> > > <Likun.Gao at amd.com>
> > > Subject: RE: [PATCH] drm/amd/pm: fix the wrong fan speed in
> > > fan1_input
> > >
> > > [AMD Official Use Only - Internal Distribution Only]
> > >
> > > Hi Alex,
> > > Right, smu_v11_0_get_fan_speed_rpm() is not correct for sienna cichlid when it's in manual mode.
> > > An example is that in my system, the rpm is about 1800 in manual mode, confirmed with AGM and the internal smu fw scoreboard.
> > > But the fan1_input shows about 180000, which is way more than the real value.
> > > If you see the value from the metrics table is 0 on navi10, maybe it's the real rpm since we still have 0 rpm feature.
> > > I can double check the navi10.
> > > Thanks.
> > >
> > >
> > > -----Original Message-----
> > > From: Alex Deucher <alexdeucher at gmail.com>
> > > Sent: Thursday, October 22, 2020 2:47 AM
> > > To: Feng, Kenneth <Kenneth.Feng at amd.com>
> > > Cc: amd-gfx list <amd-gfx at lists.freedesktop.org>; Gao, Likun
> > > <Likun.Gao at amd.com>
> > > Subject: Re: [PATCH] drm/amd/pm: fix the wrong fan speed in
> > > fan1_input
> > >
> > > [CAUTION: External Email]
> > >
> > > On Wed, Oct 21, 2020 at 9:40 AM Alex Deucher <alexdeucher at gmail.com> wrote:
> > > >
> > > > On Wed, Oct 21, 2020 at 9:01 AM Alex Deucher <alexdeucher at gmail.com> wrote:
> > > > >
> > > > > On Wed, Oct 21, 2020 at 2:45 AM Kenneth Feng <kenneth.feng at amd.com> wrote:
> > > > > >
> > > > > > fix the wrong fan speed in fan1_input when the fan control mode is manual.
> > > > > > the fan speed value is not correct when we set manual mode to fan1_enalbe - 1.
> > > > > > since the fan speed in the metrics table always reflects the
> > > > > > real fan speed,we can fetch the fan speed for both auto and manual mode.
> > > > > >
> > > > > > Signed-off-by: Kenneth Feng <kenneth.feng at amd.com>
> > > > >
> > > > > NACK.  At least on the navi boards I have, the metrics table fan
> > > > > speed reads back 0 when the fan is in manual mode.  That's why I
> > > > > changed this in the first place.
> > > >
> > > > Nevermind, I was thinking about navi1x.  If this is working
> > > > correctly on sienna cichlid, please ignore me.
> > >
> > > That said, I don't see why the current code should not work.  Maybe a bug elsewhere?  Is smu_v11_0_get_fan_speed_rpm() incorrect for sienna cichlid?
> > >
> > > Alex
> > >
> > > >
> > > > Alex
> > > >
> > > >
> > > > >
> > > > > Alex
> > > > >
> > > > >
> > > > > > ---
> > > > > >  .../gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c   | 11 +++--------
> > > > > >  1 file changed, 3 insertions(+), 8 deletions(-)
> > > > > >
> > > > > > diff --git
> > > > > > a/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
> > > > > > b/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
> > > > > > index 496abc31b07e..27b6cade9ade 100644
> > > > > > --- a/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
> > > > > > +++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
> > > > > > @@ -1171,14 +1171,9 @@ static int sienna_cichlid_get_fan_speed_rpm(struct smu_context *smu,
> > > > > >         if (!speed)
> > > > > >                 return -EINVAL;
> > > > > >
> > > > > > -       switch (smu_v11_0_get_fan_control_mode(smu)) {
> > > > > > -       case AMD_FAN_CTRL_AUTO:
> > > > > > -               return sienna_cichlid_get_smu_metrics_data(smu,
> > > > > > -                                                          METRICS_CURR_FANSPEED,
> > > > > > -                                                          speed);
> > > > > > -       default:
> > > > > > -               return smu_v11_0_get_fan_speed_rpm(smu, speed);
> > > > > > -       }
> > > > > > +       return sienna_cichlid_get_smu_metrics_data(smu,
> > > > > > +                                               METRICS_CURR_FANSPEED,
> > > > > > +                                               speed);
> > > > > >  }
> > > > > >
> > > > > >  static int sienna_cichlid_get_fan_parameters(struct
> > > > > > smu_context
> > > > > > *smu)
> > > > > > --
> > > > > > 2.17.1
> > > > > >
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