Hi Alex, Before all... Have a nice holidays! Happy new year!! - Okay, so it looks like sometimes the driver is able to enter graphical mode with the Polaris card, but most of the time it fails before with: [ 49.762704] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, signaled seq=2, emitted seq=3 - This is something that is happening sporadically but in a less intensive way in 4.17, 4.18 and 4.19 kernels, so this is actually not a regression, but rather an existent issue, which maybe the patch "drm/amdgpu/gfx_v8_0: Reorder the gfx, kiq and kcq ring tests sequence" solves. I tried to backport it to 4.20, but had no improvement. Need to try with the git version, or rc1. - This hang happens after the console is displayed in the screen, but before switching to graphical mode with X. - However if X is entered then the driver is stable and can be used for long periods. Regards, Luís Mendes On Tue, Dec 18, 2018 at 11:16 PM Luís Mendes <luis.p.mendes@xxxxxxxxx> wrote: > > 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@xxxxxxxxx> wrote: > > > > On Tue, Dec 18, 2018 at 8:58 AM Luís Mendes <luis.p.mendes@xxxxxxxxx> 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 > > > _______________________________________________ > > > amd-gfx mailing list > > > amd-gfx@xxxxxxxxxxxxxxxxxxxxx > > > https://lists.freedesktop.org/mailman/listinfo/amd-gfx _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
