• Ohad Ben-Cohen's avatar
    mmc: do not switch to 1-bit mode if not required · 6b93d01f
    Ohad Ben-Cohen authored
    6b5eda36 followed SDIO spec part E1 section 8, which states that
    in case SDIO interrupts are being used to wake up a suspended host,
    then it is required to switch to 1-bit mode before stopping the clock.
    
    Before switching to 1-bit mode (or back to 4-bit mode on resume),
    make sure that SDIO interrupts are really being used to wake the host.
    
    This is helpful for devices which have an external irq line (e.g.
    wl1271), and do not use SDIO interrupts to wake up the host.
    
    In this case, switching to 1-bit mode (and back to 4-bit mode on resume)
    is not necessary.
    Reported-by: default avatarEliad Peller <eliad@wizery.com>
    Signed-off-by: default avatarOhad Ben-Cohen <ohad@wizery.com>
    Signed-off-by: default avatarChris Ball <cjb@laptop.org>
    6b93d01f
sdio.c 17.2 KB