mmc: meson-gx: avoid clock glitch when switching to DDR modes

Browse source

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@baylibre.com>
Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

...

This commit is contained in:

Jerome Brunet 2019-04-23 11:02:33 +02:00 • committed by Ulf Hansson

parent d5f758f2df

commit dc38ac8141

1 changed files with 43 additions and 30 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

73

drivers/mmc/host/meson-gx-mmc.c

View file