From cf46d2411731e8491054e595bc3eefa0d37ce5ee Mon Sep 17 00:00:00 2001
From: Ulf Hansson <ulf.hansson@linaro.org>
Date: Mon, 10 Jun 2013 17:03:37 +0200
Subject: [PATCH] mmc: core: Validate suspend prerequisites for SDIO at
SUSPEND_PREPARE
This patch moves the validation for all the suspend prerequisites to be
done at SUSPEND_PREPARE notification. Previously in the SDIO case parts
of the validation was done from mmc_suspend_host.
This patch invents a new pre_suspend bus_ops callback and implements it
for SDIO. Returning an error code from it, will mean at SUSPEND_PREPARE
notification, the card will be removed before proceeding with the
suspend sequence.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
---
drivers/mmc/core/core.c | 25 ++++++++-----------------
drivers/mmc/core/core.h | 1 +
drivers/mmc/core/sdio.c | 27 +++++++++++++++++++++++----
3 files changed, 32 insertions(+), 21 deletions(-)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index e182ad8a33ac..8ba57a4b2a1c 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2695,22 +2695,6 @@ int mmc_suspend_host(struct mmc_host *host)
if (host->bus_ops && !host->bus_dead) {
if (host->bus_ops->suspend)
err = host->bus_ops->suspend(host);
-
- if (err == -ENOSYS || !host->bus_ops->resume) {
- /*
- * We simply "remove" the card in this case.
- * It will be redetected on resume. (Calling
- * bus_ops->remove() with a claimed host can
- * deadlock.)
- */
- host->bus_ops->remove(host);
- mmc_claim_host(host);
- mmc_detach_bus(host);
- mmc_power_off(host);
- mmc_release_host(host);
- host->pm_flags = 0;
- err = 0;
- }
}
mmc_bus_put(host);
@@ -2779,6 +2763,7 @@ int mmc_pm_notify(struct notifier_block *notify_block,
struct mmc_host *host = container_of(
notify_block, struct mmc_host, pm_notify);
unsigned long flags;
+ int err = 0;
switch (mode) {
case PM_HIBERNATION_PREPARE:
@@ -2793,7 +2778,13 @@ int mmc_pm_notify(struct notifier_block *notify_block,
if (cancel_delayed_work_sync(&host->detect))
wake_unlock(&host->detect_wake_lock);
- if (!host->bus_ops || host->bus_ops->suspend)
+ if (!host->bus_ops)
+ break;
+
+ /* Validate prerequisites for suspend */
+ if (host->bus_ops->pre_suspend)
+ err = host->bus_ops->pre_suspend(host);
+ if (!err && host->bus_ops->suspend)
break;
/* Calling bus_ops->remove() with a claimed host can deadlock */
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index 52a3650307af..79f37cfc373b 100644
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -18,6 +18,7 @@
struct mmc_bus_ops {
void (*remove)(struct mmc_host *);
void (*detect)(struct mmc_host *);
+ int (*pre_suspend)(struct mmc_host *);
int (*suspend)(struct mmc_host *);
int (*resume)(struct mmc_host *);
int (*runtime_suspend)(struct mmc_host *);
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 6c51bf05ca76..d710ed580f6f 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -931,11 +931,11 @@ out:
}
/*
- * SDIO suspend. We need to suspend all functions separately.
+ * SDIO pre_suspend. We need to suspend all functions separately.
* Therefore all registered functions must have drivers with suspend
* and resume methods. Failing that we simply remove the whole card.
*/
-static int mmc_sdio_suspend(struct mmc_host *host)
+static int mmc_sdio_pre_suspend(struct mmc_host *host)
{
int i, err = 0;
@@ -946,8 +946,26 @@ static int mmc_sdio_suspend(struct mmc_host *host)
if (!pmops || !pmops->suspend || !pmops->resume) {
/* force removal of entire card in that case */
err = -ENOSYS;
- } else
- err = pmops->suspend(&func->dev);
+ break;
+ }
+ }
+ }
+
+ return err;
+}
+
+/*
+ * SDIO suspend. Suspend all functions separately.
+ */
+static int mmc_sdio_suspend(struct mmc_host *host)
+{
+ int i, err = 0;
+
+ for (i = 0; i < host->card->sdio_funcs; i++) {
+ struct sdio_func *func = host->card->sdio_func[i];
+ if (func && sdio_func_present(func) && func->dev.driver) {
+ const struct dev_pm_ops *pmops = func->dev.driver->pm;
+ err = pmops->suspend(&func->dev);
if (err)
break;
}
@@ -1097,6 +1115,7 @@ static int mmc_sdio_runtime_resume(struct mmc_host *host)
static const struct mmc_bus_ops mmc_sdio_ops = {
.remove = mmc_sdio_remove,
.detect = mmc_sdio_detect,
+ .pre_suspend = mmc_sdio_pre_suspend,
.suspend = mmc_sdio_suspend,
.resume = mmc_sdio_resume,
.runtime_suspend = mmc_sdio_runtime_suspend,
--
2.34.1