diff options
| author | Ulf Hansson <ulf.hansson@stericsson.com> | 2011-12-19 16:24:19 +0100 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2012-01-11 23:58:48 -0500 |
| commit | aa9df4fb2adcc73d36fa41e23059519be770aaa5 (patch) | |
| tree | 3e076fe70dcdd092a9d44084e09946e2036eefc2 | |
| parent | 7efab4f35740c63502e438886cf1e4aa3f3b800f (diff) | |
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 <ulf.hansson@stericsson.com>
Reviewed-by: Hanumath Prasad <hanumath.prasad@stericsson.com>
Reviewed-by: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Acked-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
| -rw-r--r-- | drivers/mmc/core/core.c | 6 | ||||
| -rw-r--r-- | include/linux/mmc/host.h | 1 |
2 files changed, 7 insertions, 0 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 22050525be8..be7569f3fb5 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) diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 742f0e102e1..031d865167a 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -247,6 +247,7 @@ struct mmc_host { #define MMC_CAP2_CACHE_CTRL (1 << 1) /* Allow cache control */ #define MMC_CAP2_POWEROFF_NOTIFY (1 << 2) /* Notify poweroff supported */ #define MMC_CAP2_NO_MULTI_READ (1 << 3) /* Multiblock reads don't work */ +#define MMC_CAP2_NO_SLEEP_CMD (1 << 4) /* Don't allow sleep command */ mmc_pm_flag_t pm_caps; /* supported pm features */ unsigned int power_notify_type; |