From aa9df4fb2adcc73d36fa41e23059519be770aaa5 Mon Sep 17 00:00:00 2001 From: Ulf Hansson Date: Mon, 19 Dec 2011 16:24:19 +0100 Subject: mmc: core: Add option to prevent eMMC sleep command Host may now use MMC_CAP2_NO_SLEEP_CMD to disable the use of eMMC sleep/awake command. This option can be used when your platform has a buggy kernel crash dump software, which is supposed to store the dump on the eMMC, but is not able to wake up the eMMC from sleep state. In particular, failures have been seen with u-boot; even if it is fixed there, platforms will be slow to update their bootloader binaries. Signed-off-by: Ulf Hansson Reviewed-by: Hanumath Prasad Reviewed-by: Srinidhi Kasagar Acked-by: Subhash Jadavani Signed-off-by: Chris Ball --- drivers/mmc/core/core.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/mmc') diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 22050525be84..be7569f3fb56 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -2246,6 +2246,9 @@ int mmc_card_awake(struct mmc_host *host) { int err = -ENOSYS; + if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD) + return 0; + mmc_bus_get(host); if (host->bus_ops && !host->bus_dead && host->bus_ops->awake) @@ -2261,6 +2264,9 @@ int mmc_card_sleep(struct mmc_host *host) { int err = -ENOSYS; + if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD) + return 0; + mmc_bus_get(host); if (host->bus_ops && !host->bus_dead && host->bus_ops->sleep) -- cgit v1.2.3