ARM: dts: rmobile: Increase off-on delay on the SD Vcc regulator
authorMarek Vasut <marek.vasut+renesas@gmail.com>
Mon, 18 Mar 2019 02:20:31 +0000 (03:20 +0100)
committerMarek Vasut <marex@denx.de>
Mon, 25 Mar 2019 19:26:53 +0000 (20:26 +0100)
commitc49d0ac38a76c39f9556638bc9128b0969cb1536
tree85e5ed49a46c6056e9999f334323c8931d7da0c6
parentcfb3e102c4bdf96a41cbd3eeb1d3a9a56c69c46c
ARM: dts: rmobile: Increase off-on delay on the SD Vcc regulator

An ADATA 16GB Industrial MLC card has so much capacitance on the Vcc
pin that the usual toggling of regulator to power the card off and on
is insufficient. When the card is calibrated into UHS SDR104 mode, it
will remain in that mode across the power cycle and subsequent attempt
to communicate with the card will fail.

The test with this card is to insert it into an SDHI slot and perform
"mmc dev 0 ; mmc dev 0", where the second "mmc dev 0" will fail.

Fix this problem by increasing the off-on delay from 0 to 20 mS.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
arch/arm/dts/r8a7795-h3ulcb-u-boot.dts
arch/arm/dts/r8a7795-salvator-x-u-boot.dts
arch/arm/dts/r8a7796-m3ulcb-u-boot.dts
arch/arm/dts/r8a7796-salvator-x-u-boot.dts
arch/arm/dts/r8a77965-salvator-x-u-boot.dts
arch/arm/dts/r8a77990-ebisu-u-boot.dts