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authorOhad Ben-Cohen <ohad@wizery.com>2010-11-19 09:29:09 +0200
committerChris Ball <cjb@laptop.org>2010-11-19 17:07:01 -0500
commited919b0125b26dcc052e44836f66e7e1f5c49c7e (patch)
tree10abd2b197488ee2c75e693e9422668481e5e4ce /include
parent4d0812c37f2f6cf6fc7ca086b5a5e572cbbe7f6d (diff)
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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')
-rw-r--r--include/linux/mmc/host.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 6d87f68ce4b..30f6fad99a5 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 */