linux-kernel - Re: [PATCH v2 5/7] mmc: meson-gx: avoid clock glitch when switching to DDR modes

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]

Message-ID: <CAFBinCAoXx2H14GEth9HkDPjbdB=XEkL8KNcFY6vUwH+YV9Aiw@mail.gmail.com>
Date:   Sat, 27 Apr 2019 22:03:28 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Jerome Brunet <jbrunet@...libre.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        linux-amlogic@...ts.infradead.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/7] mmc: meson-gx: avoid clock glitch when switching
 to DDR modes

On Tue, Apr 23, 2019 at 11:03 AM Jerome Brunet <jbrunet@...libre.com> wrote:
>
> Activating DDR in the Amlogic mmc controller, among other things, will
> divide the output clock by 2. So by activating it with clock on, we are
> creating a glitch on the output.
>
> Instead, let's deal with DDR when the clock output is off, when setting
> the clock.
>
> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
[boot-tested on Khadas VIM and no obvious regressions could be seen]
Tested-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>

thank you for fixing this issue from v1!