On Mon, Apr 17, 2017 at 4:10 AM, Haibo Chen <haibo.chen@xxxxxxx> wrote: > 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. > > Tested-and-reported-by: Tim Harvey <tharvey@xxxxxxxxxxxxx> > Signed-off-by: Haibo Chen <haibo.chen@xxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx # v4.4+ Haibo, I believe for stable to know how far back this needs to be applied (to 4.4) you need to add something like the following in your commit log: This fixes DDR50 card support for IMX since DDR50 tuning was enabled from commit 9faac7b95ea4 (mmc: sdhci: enable tuning for DDR50) Regards, Tim