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Date:   Sun, 31 Oct 2021 03:01:09 +0000
From:   Ken Moffat <zarniwhoop@ntlworld.com>
To:     Alex Deucher <alexander.deucher@amd.com>,
        Yifan Zhang <yifan1.zhang@amd.com>,
        James Zhu <James.Zhu@amd.com>
Cc:     Felix Kuehling <Felix.Kuehling@amd.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: amdgpu hang on picasso
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On Sat, Oct 30, 2021 at 07:52:28PM +0100, Ken Moffat wrote:
> When I tried 5.15-rc7 on my picasso APU (Ryzen 5 3400G), trying to
> run 'startx' (I'm using X11 and logging in to a tty) the output
> messages from X11 stopped after a few lines (normally, the desktop
> shows before I can read anything) and keyboard/mouse were
> inoperative - had to use Magic SysRQ to sync and reboot.
> 
> The log showed
> Oct 28 03:02:21 deluxe klogd: [   31.347235] amdgpu 0000:09:00.0: amdgpu: failed to write reg 28b4 wait reg 28c6
> Oct 28 03:02:34 deluxe klogd: [   44.280185] amdgpu 0000:09:00.0: amdgpu: failed to write reg 1a6f4 wait reg 1a706
> 
> I started bisecting after confireming that linus' tree with head at
> f25a5481af12 still showed the problem.  That identified the
> following commit, which reverts cleanly and allows Xorg to start:
> 
> commit 714d9e4574d54596973ee3b0624ee4a16264d700
> Author: Yifan Zhang <yifan1.zhang@amd.com>
> Date:   Tue Sep 28 15:42:35 2021 +0800
> 
>     drm/amdgpu: init iommu after amdkfd device init
>     
>     This patch is to fix clinfo failure in Raven/Picasso:
>     
>     Number of platforms: 1
>       Platform Profile: FULL_PROFILE
>       Platform Version: OpenCL 2.2 AMD-APP (3364.0)
>       Platform Name: AMD Accelerated Parallel Processing
>       Platform Vendor: Advanced Micro Devices, Inc.
>       Platform Extensions: cl_khr_icd cl_amd_event_callback
>     
>       Platform Name: AMD Accelerated Parallel Processing Number of devices: 0
>     
>     Signed-off-by: Yifan Zhang <yifan1.zhang@amd.com>
>     Reviewed-by: James Zhu <James.Zhu@amd.com>
>     Tested-by: James Zhu <James.Zhu@amd.com>
>     Acked-by: Felix Kuehling <Felix.Kuehling@amd.com>
>     Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
> 
>  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> I've got a laptop with raven, I'll try to find time to test it that
> also shows he problem in the next few days.
> 
The laptop (AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx) works
fine without reverting that patch, only the picasso has the problem.

ĸen
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