• Ohad Ben-Cohen's avatar
    mmc: sdio: fix runtime PM anomalies by introducing MMC_CAP_POWER_OFF_CARD · ed919b01
    Ohad Ben-Cohen authored
    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: default avatarDaniel Drake <dsd@laptop.org>
    Reported-and-tested-by: default avatarArnd Hannemann <arnd@arndnet.de>
    Signed-off-by: default avatarOhad Ben-Cohen <ohad@wizery.com>
    Signed-off-by: default avatarChris Ball <cjb@laptop.org>
    ed919b01
sdio_bus.c 8.22 KB