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authorUlf Hansson <ulf.hansson@stericsson.com>2011-12-19 16:24:19 +0100
committerChris Ball <cjb@laptop.org>2012-01-11 23:58:48 -0500
commitaa9df4fb2adcc73d36fa41e23059519be770aaa5 (patch)
tree3e076fe70dcdd092a9d44084e09946e2036eefc2 /drivers/mmc
parent7efab4f35740c63502e438886cf1e4aa3f3b800f (diff)
downloadop-kernel-dev-aa9df4fb2adcc73d36fa41e23059519be770aaa5.zip
op-kernel-dev-aa9df4fb2adcc73d36fa41e23059519be770aaa5.tar.gz
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>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/core/core.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 2205052..be7569f 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)
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