AMDGPU with 4.19.x kernel - cannot enable DPM

[Chris Rankin]

Yes, all 4.19.x kernels have been fine without the amdgpu.dpm=1 kernel
parameter. In fact, this is how I am running my kernel right now. With the
4.18.x series I did specify amdgpu.dpm=1 explicitly on the GRUB2 command
line, and I inherited this setting when I migrated to 4.19.

On Thu, 6 Dec 2018 at 15:53, Alex Deucher <alexdeucher at gmail.com> wrote:

> Does it work without amdgpu.dpm=1 on your kernel command line?  You
> don't need to specify it, it;s enabled by default.  The default dpm
> implementation changed so specifying dpm=1 will change the dpm
> implementation used by the driver.
>
> Alex
> On Thu, Dec 6, 2018 at 10:47 AM Alex Deucher <alexdeucher at gmail.com>
> wrote:
> >
> > I can't reproduce this.  Can you bisect?
> >
> > Alex
> > On Thu, Dec 6, 2018 at 8:38 AM Chris Rankin <rankincj at gmail.com> wrote:
> > >
> > > Hi,
> > >
> > > I'm still unable to enable DPM with my R7 360, AMDGPU driver, Linux
> 4.19.7 kernel. Dmesg log is attached, showing that it is correctly using
> PCIE gen2 speeds.
> > >
> > > Cheers,
> > > Chris
> > >
> > > On Sat, 24 Nov 2018 at 13:12, Chris Rankin <rankincj at gmail.com> wrote:
> > >>
> > >> Hi, thanks for the reply.
> > >>
> > >> That patch doesn't solve my issue, although it does mean that the DRM
> layer no longer tries to enable "gen 3" PCIE link speeds.
> > >> I have attached the dmesg output for a stock 4.19.4 kernel that also
> has your patch applied.
> > >>
> > >> Cheers,
> > >> Chris
> > >>
> > >> On Fri, 23 Nov 2018 at 20:25, Alex Deucher <alexdeucher at gmail.com>
> wrote:
> > >>>
> > >>> On Thu, Nov 22, 2018 at 7:23 PM Chris Rankin <rankincj at gmail.com>
> wrote:
> > >>> >
> > >>> > Hi,
> > >>> >
> > >>> > I have recently tried to use dpm=1 with the amdgpu driver for the
> 4.19.x kernel, but unfortunately the screen just went black. This is a
> regression from the 4.18.x kernel.
> > >>> >
> > >>> > I have attached the full dmesg log, but the relevant section look
> to be:
> > >>> >
> > >>> > [    8.958679] WARNING: CPU: 0 PID: 320 at
> drivers/gpu/drm/drm_mm.c:950 drm_mm_takedown+0x1f/0x30 [drm]
> > >>> > [    9.010509] Code: f6 c3 48 8d 41 c0 eb bb 0f 1f 00 66 66 66 66
> 90 48 8b 47 38 48 83 c7 38 48 39 c7 75 01 c3 48 c7 c7 a0 68 26 c0 e8 6b 4d
> e8 d9 <0f> 0b c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90
> > >>> > [    9.029395] RSP: 0018:ffffae0681e8f9e8 EFLAGS: 00010282
> > >>> > [    9.034681] RAX: 0000000000000000 RBX: ffff91febbb9f900 RCX:
> 0000000000000000
> > >>> > [    9.041875] RDX: ffff91fec3a1cf00 RSI: ffff91fec3a16868 RDI:
> ffff91fec3a16868
> > >>> > [    9.049068] RBP: ffff91feb92b29a0 R08: 0000000000000000 R09:
> ffff91fb800bb480
> > >>> > [    9.056260] R10: ffffffff9a4e7560 R11: ffffffff9b9b616d R12:
> ffff91feb92b2980
> > >>> > [    9.063454] R13: 0000000000000000 R14: 0000000000000170 R15:
> ffff91feb938aee0
> > >>> > [    9.070647] FS:  00007f71200ee180(0000)
> GS:ffff91fec3a00000(0000) knlGS:0000000000000000
> > >>> > [    9.078821] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > >>> > [    9.084625] CR2: 00007f8be0615020 CR3: 000000033b014000 CR4:
> 00000000000006f0
> > >>> >
> > >>>
> > >>> You may need this patch depending on your platform:
> > >>> https://patchwork.freedesktop.org/patch/259364/
> > >>>
> > >>> Alex
> > >>>
> > >>> > Cheers,
> > >>> > Chris
> > >>> >
> > >>> > _______________________________________________
> > >>> > dri-devel mailing list
> > >>> > dri-devel at lists.freedesktop.org
> > >>> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
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