Messages in this thread | | | Subject | Re: [PATCH v2] ARM: dts: imx51-zii-rdu1: Make sure SD1_WP is low | From | Nikita Yushchenko <> | Date | Thu, 31 May 2018 12:12:59 +0300 |
| |
> Make sure that MX51_PAD_GPIO1_1 does not remain configure as > ALT0/SD1_WP (it is out of reset). This is needed because of external > pull-up resistor attached to that pad that, when left unchanged, will > drive SD1_WP high preventing eSDHC1/eMMC from working correctly. > > To fix that add a pinmux configuration line configureing the pad to > function as a GPIO. While we are at it, add a corresponding > output-high GPIO hog in an effort to minimize current consumption. > > Cc: Nikita Yushchenko <nikita.yoush@cogentembedded.com> > Cc: Shawn Guo <shawnguo@kernel.org> > Cc: Fabio Estevam <fabio.estevam@nxp.com> > Cc: Lucas Stach <l.stach@pengutronix.de> > Cc: Chris Healy <cphealy@gmail.com> > Cc: Rob Herring <robh+dt@kernel.org> > Cc: linux-arm-kernel@lists.infradead.org > Cc: devicetree@vger.kernel.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Tested-By: Nikita Yushchenko <nikita.yoush@cogentembedded.com
Tested on 8.9'' RDU1. Without this patch, eMMC does not work, get
[ 40.801367] mmc0: Timeout waiting for hardware interrupt. [ 40.806789] mmc0: sdhci: ============ SDHCI REGISTER DUMP =========== ... <dump follows>
With this patch, eMMC works correctly.
Nikita
| |