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| author | Ohad Ben-Cohen <ohad@wizery.com> | 2010-11-19 08:29:09 +0100 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2010-11-19 23:07:01 +0100 |
| commit | ed919b0125b26dcc052e44836f66e7e1f5c49c7e (patch) | |
| tree | 10abd2b197488ee2c75e693e9422668481e5e4ce /kernel/tracepoint.c | |
| parent | mmc: sdio: fix nasty oops in mmc_sdio_detect (diff) | |
| download | linux-ed919b0125b26dcc052e44836f66e7e1f5c49c7e.tar.xz linux-ed919b0125b26dcc052e44836f66e7e1f5c49c7e.zip | |
mmc: sdio: fix runtime PM anomalies by introducing MMC_CAP_POWER_OFF_CARD
Some board/card/host configurations are not capable of powering off the
card after boot.
To support such configurations, and to allow smoother transition to
runtime PM behavior, MMC_CAP_POWER_OFF_CARD is added, so hosts need to
explicitly indicate whether it's OK to power off their cards after boot.
SDIO core will enable runtime PM for a card only if that cap is set.
As a result, the card will be powered down after boot, and will only
be powered up again when a driver is loaded (and then it's up to the
driver to decide whether power will be kept or not).
This will prevent sdio_bus_probe() failures with setups that do not
support powering off the card.
Reported-and-tested-by: Daniel Drake <dsd@laptop.org>
Reported-and-tested-by: Arnd Hannemann <arnd@arndnet.de>
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'kernel/tracepoint.c')
0 files changed, 0 insertions, 0 deletions