mmc: sdhci-esdhc-imx: increase the pad I/O drive strength for DDR50 card
authorHaibo Chen <haibo.chen@nxp.com>
Wed, 19 Apr 2017 02:53:51 +0000 (10:53 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 30 Apr 2017 03:49:13 +0000 (05:49 +0200)
commitdf5024c30a27fd1f6ddde9915e773e4fcad48377
tree85c81ddb938d703112d55d8a6d7f4875b1187014
parent53d2524d3cc8ccf7d8119bf4e643846c3c4f4562
mmc: sdhci-esdhc-imx: increase the pad I/O drive strength for DDR50 card

commit 9f327845358d3dd0d8a5a7a5436b0aa5c432e757 upstream.

Currently for DDR50 card, it need tuning in default. We meet tuning fail
issue for DDR50 card and some data CRC error when DDR50 sd card works.

This is because the default pad I/O drive strength can't make sure DDR50
card work stable. So increase the pad I/O drive strength for DDR50 card,
and use pins_100mhz.

This fixes DDR50 card support for IMX since DDR50 tuning was enabled from
commit 9faac7b95ea4 ("mmc: sdhci: enable tuning for DDR50")

Tested-and-reported-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Acked-by: Dong Aisheng <aisheng.dong@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/mmc/host/sdhci-esdhc-imx.c