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 <san@google.com>

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 1d8e84a..0d4e316 100644 (file)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1054,6 +1054,30 @@ 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.
@@ -1711,6 +1735,9 @@ 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);
@@ -1753,6 +1780,12 @@ 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 (!(host->pm_flags & MMC_PM_KEEP_POWER)) {
                        mmc_power_up(host);

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index ba8ca98..01a858f 100644 (file)
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -227,6 +227,10 @@ struct mmc_host {
        const struct mmc_bus_ops *bus_ops;      /* current bus driver */
        unsigned int            bus_refs;       /* reference counter */
 
+       unsigned int            bus_resume_flags;
+#define MMC_BUSRESUME_MANUAL_RESUME    (1 << 0)
+#define MMC_BUSRESUME_NEEDS_RESUME     (1 << 1)
+
        unsigned int            sdio_irqs;
        struct task_struct      *sdio_irq_thread;
        atomic_t                sdio_irq_thread_abort;
@@ -278,6 +282,17 @@ static inline void *mmc_priv(struct mmc_host *host)
 #define mmc_dev(x)     ((x)->parent)
 #define mmc_classdev(x)        (&(x)->class_dev)
 #define mmc_hostname(x)        (dev_name(&(x)->class_dev))
+#define mmc_bus_needs_resume(host) ((host)->bus_resume_flags & MMC_BUSRESUME_NEEDS_RESUME)
+
+static inline void mmc_set_bus_resume_policy(struct mmc_host *host, int manual)
+{
+       if (manual)
+               host->bus_resume_flags |= MMC_BUSRESUME_MANUAL_RESUME;
+       else
+               host->bus_resume_flags &= ~MMC_BUSRESUME_MANUAL_RESUME;
+}
+
+extern int mmc_resume_bus(struct mmc_host *host);
 
 extern int mmc_suspend_host(struct mmc_host *);
 extern int mmc_resume_host(struct mmc_host *);