From 10797cfdbb14c6c1a95775c49a1fd940f216391b Mon Sep 17 00:00:00 2001 From: San Mehat Date: Thu, 30 Jul 2009 07:55:28 -0700 Subject: mmc: core: Add deferred bus resume policy. A card driver can now specify that the underlying bus should *not* auto-resume with the rest of the system. This is useful for reducing resume latency as well as saving power when the card driver is not using the bus. In the future, we'll add support for manual suspend Signed-off-by: San Mehat --- drivers/mmc/core/core.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) (limited to 'drivers/mmc') diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index e01daef..14242c5 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -1097,6 +1097,30 @@ static inline void mmc_bus_put(struct mmc_host *host) spin_unlock_irqrestore(&host->lock, flags); } +int mmc_resume_bus(struct mmc_host *host) +{ + if (!mmc_bus_needs_resume(host)) + return -EINVAL; + + printk("%s: Starting deferred resume\n", mmc_hostname(host)); + host->bus_resume_flags &= ~MMC_BUSRESUME_NEEDS_RESUME; + mmc_bus_get(host); + if (host->bus_ops && !host->bus_dead) { + mmc_power_up(host); + BUG_ON(!host->bus_ops->resume); + host->bus_ops->resume(host); + } + + if (host->bus_ops->detect && !host->bus_dead) + host->bus_ops->detect(host); + + mmc_bus_put(host); + printk("%s: Deferred resume completed\n", mmc_hostname(host)); + return 0; +} + +EXPORT_SYMBOL(mmc_resume_bus); + /* * Assign a mmc bus handler to a host. Only one bus handler may control a * host at any given time. @@ -1761,6 +1785,9 @@ int mmc_suspend_host(struct mmc_host *host) { int err = 0; + if (mmc_bus_needs_resume(host)) + return 0; + if (host->caps & MMC_CAP_DISABLE) cancel_delayed_work(&host->disable); cancel_delayed_work(&host->detect); @@ -1803,6 +1830,12 @@ int mmc_resume_host(struct mmc_host *host) int err = 0; mmc_bus_get(host); + if (host->bus_resume_flags & MMC_BUSRESUME_MANUAL_RESUME) { + host->bus_resume_flags |= MMC_BUSRESUME_NEEDS_RESUME; + mmc_bus_put(host); + return 0; + } + if (host->bus_ops && !host->bus_dead) { if (!mmc_card_keep_power(host)) { mmc_power_up(host); -- cgit v1.1