Regression with kernel 4.20 on armhf

[Luís Mendes]

Hi Alex,

I am already using drm_arch_can_wc_memory() set to false.
I will try to bisect...

Regards,
Luís

On Tue, Dec 18, 2018 at 7:03 PM Alex Deucher <alexdeucher at gmail.com> wrote:
>
> On Tue, Dec 18, 2018 at 8:58 AM Luís Mendes <luis.p.mendes at gmail.com> wrote:
> >
> > Hi Christian,
> >
> > I've been using a Sapphire RX 550 and a Sapphire RX 460 on a custom
> > armhf board that runs well with Linux 4.19.9 at least, but now
> > starting with Linux kernel 4.20, I'm having a gpu hang, right after
> > the console being displayed, but before entering in graphical mode,
> > when starting X session.
> > I'm only reporting this now, because there was a PCI commit for mvebu
> > that also entered for linux-4.20 that caused a kernel oops during
> > pci_map_rom call in amdgpu initialization code. I've reverted that
> > patch, but now amdgpu is hanging.
>
> It would be useful if you could bisect.  This is the first I've heard
> of amdgpu working on an ARM board without write combining (WC)
> disabled.  You might check to see if disabling WC helps.  Return false
> in drm_arch_can_wc_memory().
>
> Alex
>
> >
> >
> > [   24.801861] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx
> > timeout, signaled seq=2, emitted seq=3
> >
> > 02:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
> > [AMD/ATI] Baffin [Polaris11] (rev ff) (prog-if 00 [VGA controller])
> >     Subsystem: Sapphire Technology Limited Baffin [Radeon RX 560]
> >     Flags: bus master, fast devsel, latency 0, IRQ 51
> >     Memory at d0000000 (64-bit, prefetchable) [size=256M]
> >     Memory at e0000000 (64-bit, prefetchable) [size=2M]
> >     I/O ports at 10000 [size=256]
> >     Memory at e0200000 (32-bit, non-prefetchable) [size=256K]
> >     Expansion ROM at e0240000 [disabled] [size=128K]
> >     Capabilities: <access denied>
> >     Kernel driver in use: amdgpu
> >     Kernel modules: amdgpu
> >
> > dmesg follows in attachment.
> >
> > Regards,
> > Luís
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