diff options
| author | Ohad Ben-Cohen <ohad@wizery.com> | 2010-11-19 09:29:09 +0200 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2010-11-19 17:07:01 -0500 |
| commit | ed919b0125b26dcc052e44836f66e7e1f5c49c7e (patch) | |
| tree | 10abd2b197488ee2c75e693e9422668481e5e4ce /include/linux/mmc/host.h | |
| parent | 4d0812c37f2f6cf6fc7ca086b5a5e572cbbe7f6d (diff) | |
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 'include/linux/mmc/host.h')
| -rw-r--r-- | include/linux/mmc/host.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 6d87f68ce4b6..30f6fad99a58 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -168,6 +168,7 @@ struct mmc_host { /* DDR mode at 1.8V */ #define MMC_CAP_1_2V_DDR (1 << 12) /* can support */ /* DDR mode at 1.2V */ +#define MMC_CAP_POWER_OFF_CARD (1 << 13) /* Can power off after boot */ mmc_pm_flag_t pm_caps; /* supported pm features */ |