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

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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!