> -----Original Message----- > From: linux-mmc-owner@xxxxxxxxxxxxxxx [mailto:linux-mmc- > owner@xxxxxxxxxxxxxxx] On Behalf Of Ulf Hansson > Sent: Thursday, December 15, 2011 3:06 PM > To: linux-mmc@xxxxxxxxxxxxxxx; Chris Ball > Cc: Per Forlin; Ulf Hansson; Johan Rudholm; Lee Jones > Subject: [PATCH V2] mmc: core: Add option to prevent eMMC sleep command > > Host may now use MMC_CAP2_NOSLEEP to disable the use of > eMMC sleep/awake command. > > This option can be used when you platform have 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. > > Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxxxxxx> > Reviewed-by: Hanumath Prasad <hanumath.prasad@xxxxxxxxxxxxxx> > Reviewed-by: Srinidhi Kasagar <srinidhi.kasagar@xxxxxxxxxxxxxx> > --- > > Changes in v2: > - Added some motivation to why this patch is wanted in the > commit message. > > --- > drivers/mmc/core/core.c | 6 ++++++ > 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 a2aa860..5a1ce37 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_NOSLEEP) > + 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_NOSLEEP) > + 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 9a03d03..d07fb27 100644 > --- a/include/linux/mmc/host.h > +++ b/include/linux/mmc/host.h > @@ -242,6 +242,7 @@ 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_NOSLEEP (1 << 4) /* Don't allow sleep command Can we rename this CAP to something like "MMC_CAP2_NO_MMC_SLEEP_CMD" to make it more specific? > */ > > mmc_pm_flag_t pm_caps; /* supported pm features */ > unsigned int power_notify_type; > -- > 1.7.5.4 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
