linux-kernel - Re: [PATCH] drm/msm/a6xx: Remove unneeded GBIF unhalt

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 5 Feb 2020 12:41:32 -0800
From:   John Stultz <john.stultz@...aro.org>
To:     Jordan Crouse <jcrouse@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        freedreno@...ts.freedesktop.org,
        Sharat Masetty <smasetty@...eaurora.org>,
        lkml <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Sean Paul <sean@...rly.run>
Subject: Re: [PATCH] drm/msm/a6xx: Remove unneeded GBIF unhalt

On Tue, Feb 4, 2020 at 9:42 AM Jordan Crouse <jcrouse@...eaurora.org> wrote:
>
> Commit e812744c5f95 ("drm: msm: a6xx: Add support for A618") added a
> universal GBIF un-halt into a6xx_start(). This can cause problems for
> a630 targets which do not use GBIF and might have access protection
> enabled on the region now occupied by the GBIF registers.
>
> But it turns out that we didn't need to unhalt the GBIF in this path
> since the stop function already takes care of that after executing a flush
> but before turning off the headswitch. We should be confident that the
> GBIF is open for business when we restart the hardware.
>
> Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>

Sorry, yesterday got busy with other things and I didn't get around to
testing your patch, but I have tested earlier with my own patch which
is identical:
  https://git.linaro.org/people/john.stultz/android-dev.git/commit/?h=dev/db845c-mainline-WIP&id=4e6a2e84dd77fe74faa1a6b797eb0ee7bf11ffd7

So, I think I can safely add:
Tested-by: John Stultz <john.stultz@...aro.org>

Thanks so much for the quick turnaround on this!
-john