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Date: Thu, 18 Apr 2019 22:16:56 +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 5/7] mmc: meson-gx: avoid clock glitch when switching to DDR modes Hi Jerome, On Wed, Apr 17, 2019 at 10:44 PM 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> it seems that this patch breaks SD card on my Khadas VIM and Khadas VIM2. I used git bisect within this series to find that issue. applying your .dts patches on top doesn't fix it two boot logs attached: * kvim-broken.txt has patches 1-5 (= including this patch) applied * kvim-working.txt has only patches 1-4 (= excluding this patch) applied Regards Martin View attachment "kvim-broken.txt" of type "text/plain" (22112 bytes) View attachment "kvin-working.txt" of type "text/plain" (20594 bytes)
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