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authorUlf Hansson <ulf.hansson@linaro.org>2013-10-10 14:20:05 +0200
committerChris Ball <cjb@laptop.org>2013-10-30 20:28:42 -0400
commit0cb403a227774f60f6f52137ca3618805498c4e6 (patch)
tree2d78049251a16d39fee319a8486649af293b4ba6 /drivers/mmc
parent0cc81a8c6442e43618ff245948bfaa14fdf7938b (diff)
mmc: core: Improve runtime PM support during suspend/resume for sd/mmc
The card device is considered as in-active after it has been suspended. To prevent any further runtime PM requests in suspend state, we then disable runtime PM. After the card device has been resumed, we shall consider it as active, like we also do after a probe sequence. When resumed, we can safely enable runtime PM again. This will make sure the PM core can request the card device to go to in-active state after a resume has been completed. Previously we had to wait for new pm_runtime_get->pm_runtime_put cycle to be executed. Additionally, once a resume has been carried out, update the last busy mark. At the moment this will have no effect but if the PM core will respect autosuspend enabled devices, when it directly triggers a runtime_suspend from a runtime_idle, it will mean the card device will be scheduled for a delayed runtime_suspend instead of done immediately. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/core/mmc.c38
-rw-r--r--drivers/mmc/core/sd.c45
2 files changed, 66 insertions, 17 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index b22eff80a95e..7f5dc26865de 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -13,6 +13,7 @@
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/stat.h>
+#include <linux/pm_runtime.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
@@ -1510,20 +1511,26 @@ out:
}
/*
- * Suspend callback from host.
+ * Suspend callback
*/
static int mmc_suspend(struct mmc_host *host)
{
- return _mmc_suspend(host, true);
+ int err;
+
+ err = _mmc_suspend(host, true);
+ if (!err) {
+ pm_runtime_disable(&host->card->dev);
+ pm_runtime_set_suspended(&host->card->dev);
+ }
+
+ return err;
}
/*
- * Resume callback from host.
- *
* This function tries to determine if the same card is still present
* and, if so, restore all state to it.
*/
-static int mmc_resume(struct mmc_host *host)
+static int _mmc_resume(struct mmc_host *host)
{
int err = 0;
@@ -1557,7 +1564,7 @@ static int mmc_shutdown(struct mmc_host *host)
*/
if (mmc_can_poweroff_notify(host->card) &&
!(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
- err = mmc_resume(host);
+ err = _mmc_resume(host);
if (!err)
err = _mmc_suspend(host, false);
@@ -1566,6 +1573,21 @@ static int mmc_shutdown(struct mmc_host *host)
}
/*
+ * Callback for resume.
+ */
+static int mmc_resume(struct mmc_host *host)
+{
+ int err;
+
+ err = _mmc_resume(host);
+ pm_runtime_set_active(&host->card->dev);
+ pm_runtime_mark_last_busy(&host->card->dev);
+ pm_runtime_enable(&host->card->dev);
+
+ return err;
+}
+
+/*
* Callback for runtime_suspend.
*/
static int mmc_runtime_suspend(struct mmc_host *host)
@@ -1575,7 +1597,7 @@ static int mmc_runtime_suspend(struct mmc_host *host)
if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
return 0;
- err = mmc_suspend(host);
+ err = _mmc_suspend(host, true);
if (err)
pr_err("%s: error %d doing aggessive suspend\n",
mmc_hostname(host), err);
@@ -1593,7 +1615,7 @@ static int mmc_runtime_resume(struct mmc_host *host)
if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
return 0;
- err = mmc_resume(host);
+ err = _mmc_resume(host);
if (err)
pr_err("%s: error %d doing aggessive resume\n",
mmc_hostname(host), err);
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 7b2854009e39..447fa8e9f322 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -13,6 +13,7 @@
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/stat.h>
+#include <linux/pm_runtime.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
@@ -1067,10 +1068,7 @@ static void mmc_sd_detect(struct mmc_host *host)
}
}
-/*
- * Suspend callback from host.
- */
-static int mmc_sd_suspend(struct mmc_host *host)
+static int _mmc_sd_suspend(struct mmc_host *host)
{
int err = 0;
@@ -1096,12 +1094,26 @@ out:
}
/*
- * Resume callback from host.
- *
+ * Callback for suspend
+ */
+static int mmc_sd_suspend(struct mmc_host *host)
+{
+ int err;
+
+ err = _mmc_sd_suspend(host);
+ if (!err) {
+ pm_runtime_disable(&host->card->dev);
+ pm_runtime_set_suspended(&host->card->dev);
+ }
+
+ return err;
+}
+
+/*
* This function tries to determine if the same card is still present
* and, if so, restore all state to it.
*/
-static int mmc_sd_resume(struct mmc_host *host)
+static int _mmc_sd_resume(struct mmc_host *host)
{
int err = 0;
@@ -1123,6 +1135,21 @@ out:
}
/*
+ * Callback for resume
+ */
+static int mmc_sd_resume(struct mmc_host *host)
+{
+ int err;
+
+ err = _mmc_sd_resume(host);
+ pm_runtime_set_active(&host->card->dev);
+ pm_runtime_mark_last_busy(&host->card->dev);
+ pm_runtime_enable(&host->card->dev);
+
+ return err;
+}
+
+/*
* Callback for runtime_suspend.
*/
static int mmc_sd_runtime_suspend(struct mmc_host *host)
@@ -1132,7 +1159,7 @@ static int mmc_sd_runtime_suspend(struct mmc_host *host)
if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
return 0;
- err = mmc_sd_suspend(host);
+ err = _mmc_sd_suspend(host);
if (err)
pr_err("%s: error %d doing aggessive suspend\n",
mmc_hostname(host), err);
@@ -1150,7 +1177,7 @@ static int mmc_sd_runtime_resume(struct mmc_host *host)
if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
return 0;
- err = mmc_sd_resume(host);
+ err = _mmc_sd_resume(host);
if (err)
pr_err("%s: error %d doing aggessive resume\n",
mmc_hostname(host), err);