linux_dsm_epyc7002/drivers/mmc
Daniel Drake 8ed765aac3 mmc: dt: add no-1-8-v device tree flag
The OLPC XO-1.75 laptop includes a SDHCI controller which is 1.8v
capable, and it truthfully reports so in its capabilities. This
alternate voltage is used for driving new "UHS-I" SD cards at their
full speed.

However, what the controller doesn't know is that the motherboard
physically doesn't have a 1.8v supply available, so attempting to
switch to the 1.8v level will result in a situation that cannot be
recovered from without physically replugging the SD card.

Add a device tree flag that can be used on systems like these,
and hook it up to the equivalent SDHCI quirk.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Reviewed-by: Philip Rakity <prakity@nvidia.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
2012-12-06 13:55:05 -05:00
..
card mmc: card: Add RPMB support in IOCTL interface 2012-12-06 13:54:49 -05:00
core mmc: sdio: Add empty bus-level suspend/resume callbacks 2012-12-06 13:55:04 -05:00
host mmc: dt: add no-1-8-v device tree flag 2012-12-06 13:55:05 -05:00
Kconfig mmc: explicitly mention SDIO support in Kconfig 2008-10-12 11:04:36 +02:00
Makefile mmc: sdhci-pci: add platform data 2012-01-11 23:58:47 -05:00