MMC host need to power ungate host each time before sending a request and try to power gate host each time after the request is done.
MMC host has a sysfs interface to let user specify the auto suspended delay. Each slot of the host controller can have a different delay for runtime suspended. Signed-off-by: Chuanxiao Dong <[email protected]> --- drivers/mmc/core/core.c | 15 +++++++++++++++ drivers/mmc/core/host.c | 21 +++++++++++++++++++++ 2 files changed, 36 insertions(+), 0 deletions(-) diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 6625c05..e296c5a 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -133,6 +133,9 @@ void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) mrq->done(mrq); mmc_host_clk_gate(host); + + /* put the host after using */ + pm_runtime_put(&host->class_dev); } } @@ -150,6 +153,12 @@ mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) mmc_hostname(host), mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags); + /* + * Before touch any of host controller registers, + * driver should make sure the host is powered up + */ + pm_runtime_get_sync(&host->class_dev); + if (mrq->data) { pr_debug("%s: blksz %d blocks %d flags %08x " "tsac %d ms nsac %d\n", @@ -1522,6 +1531,9 @@ void mmc_rescan(struct work_struct *work) if (host->rescan_disable) return; + /* power up host controller first */ + pm_runtime_get_sync(&host->class_dev); + mmc_bus_get(host); /* @@ -1564,6 +1576,9 @@ void mmc_rescan(struct work_struct *work) mmc_release_host(host); out: + /* power off host controller */ + pm_runtime_put(&host->class_dev); + if (host->caps & MMC_CAP_NEEDS_POLL) mmc_schedule_delayed_work(&host->detect, HZ); } diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index b3ac6c5..a27b811 100644 --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -19,6 +19,7 @@ #include <linux/leds.h> #include <linux/slab.h> #include <linux/suspend.h> +#include <linux/pm_runtime.h> #include <linux/mmc/host.h> #include <linux/mmc/card.h> @@ -28,6 +29,14 @@ #define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev) +static const struct dev_pm_ops host_pm = { + SET_RUNTIME_PM_OPS( + pm_generic_runtime_suspend, + pm_generic_runtime_resume, + pm_generic_runtime_idle + ) +}; + static void mmc_host_classdev_release(struct device *dev) { struct mmc_host *host = cls_dev_to_mmc_host(dev); @@ -37,6 +46,7 @@ static void mmc_host_classdev_release(struct device *dev) static struct class mmc_host_class = { .name = "mmc_host", .dev_release = mmc_host_classdev_release, + .pm = &host_pm, }; int mmc_register_host_class(void) @@ -334,6 +344,15 @@ int mmc_add_host(struct mmc_host *host) if (err) return err; + /* enable runtime pm */ + err = pm_runtime_set_active(&host->class_dev); + if (err) + pr_err("err is %d when active mmc host\n", err); + else { + pm_runtime_enable(&host->class_dev); + pm_runtime_set_autosuspend_delay(&host->class_dev, 100); + } + #ifdef CONFIG_DEBUG_FS mmc_add_host_debugfs(host); #endif @@ -363,6 +382,8 @@ void mmc_remove_host(struct mmc_host *host) mmc_remove_host_debugfs(host); #endif + pm_runtime_disable(&host->class_dev); + device_del(&host->class_dev); led_trigger_unregister_simple(host->led); -- 1.6.6.1 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
