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Date:   Tue, 7 Aug 2018 14:17:34 -0400 (EDT)
From:   Mikulas Patocka <mpatocka@redhat.com>
To:     Ard Biesheuvel <ard.biesheuvel@linaro.org>
cc:     Marcin Wojtas <mw@semihalf.com>,
        Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
        Joao Pinto <Joao.Pinto@synopsys.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        linux-pci <linux-pci@vger.kernel.org>,
        Will Deacon <will.deacon@arm.com>,
        Russell King - ARM Linux <linux@armlinux.org.uk>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Matt Sealey <neko@bakuhatsu.net>,
        Jingoo Han <jingoohan1@gmail.com>,
        Robin Murphy <robin.murphy@arm.com>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: framebuffer corruption due to overlapping stp instructions on
 arm64
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On Tue, 7 Aug 2018, Ard Biesheuvel wrote:

> On 7 August 2018 at 19:39, Mikulas Patocka <mpatocka@redhat.com> wrote:
> >
> >
> > On Tue, 7 Aug 2018, Marcin Wojtas wrote:
> >
> >> Ard, Mikulas,
> >>
> >> After some self-caused setup issues I was able to run the test on my
> >> MacchiatoBin with the kernel v4.18-rc8. It's been running for 1h+ now,
> >> loading the CPU to 100% and no single error event...
> >>
> >> I built the binary file with:
> >> gcc-linaro-7.2.1-2017.11-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-gcc -O2
> >>
> >> Maybe it's the older firmware issue?
> >
> > I have downloaded and built the firmware recently (it has timestamp Jul 30
> > 2018).
> >
> > Do you still have your firmware file "flash-image.bin" that you used, so
> > that I could try it?
> >
> >> Please send the full bootlog with
> >> the very first line after reset. My board rev is v1.3 and I use
> >> mainline UEFI (newest edk2 + edk2-platforms) + newest publicly
> >> available ARM-TF and earliest firmware for this board.
> >>
> >> Best regards,
> >> Marcin
> >
> 
> Mikulas,
> 
> Is the issue reproducible with an nvidia card + nouveau driver as well ?
> 
> Given the screen corruption i see with radeon even on other arm
> systems, i'd like to ensure that this is a platform bug not a driver
> bug.

I see the same memcpy-to-framebuffer corruption on Radeon HD 6450 and 
nVidia Quadro NVS 285.

3D acceleration on nVidia is slow, but it doesn't have visible glitches.

Mikulas