Re: [PATCH V2]mmc: remove MMC bus legacy suspend/resume method

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On 04/05/2012 09:51 AM, Chuanxiao Dong wrote:
MMC bus is using legacy suspend/resume method, which is not compatible if
runtime pm callbacks are used. In this scenario, MMC bus suspend/resume
callbacks cannot be called when system entering S3. So change to use the new
defined dev_pm_ops for system sleeping mode

Signed-off-by: Chuanxiao Dong<chuanxiao.dong@xxxxxxxxx>
---
Changes in v2:
	use SET_SYSTEM_SLEEP_PM_OPS to define sleep callbacks as Rafael
	suggested

  drivers/mmc/card/block.c |    2 +-
  drivers/mmc/core/bus.c   |   26 ++++++++++++--------------
  include/linux/mmc/card.h |    2 +-
  3 files changed, 14 insertions(+), 16 deletions(-)

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index f2020d3..3582c03 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1826,7 +1826,7 @@ static void mmc_blk_remove(struct mmc_card *card)
  }

  #ifdef CONFIG_PM
-static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
+static int mmc_blk_suspend(struct mmc_card *card)
  {
  	struct mmc_blk_data *part_md;
  	struct mmc_blk_data *md = mmc_get_drvdata(card);
diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index 5d011a3..d44f0d9 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -122,14 +122,14 @@ static int mmc_bus_remove(struct device *dev)
  	return 0;
  }

-static int mmc_bus_suspend(struct device *dev, pm_message_t state)
+static int mmc_bus_suspend(struct device *dev)
  {
  	struct mmc_driver *drv = to_mmc_driver(dev->driver);
  	struct mmc_card *card = mmc_dev_to_card(dev);
  	int ret = 0;

  	if (dev->driver&&  drv->suspend)
-		ret = drv->suspend(card, state);
+		ret = drv->suspend(card);
  	return ret;
  }

@@ -165,20 +165,20 @@ static int mmc_runtime_idle(struct device *dev)
  	return pm_runtime_suspend(dev);
  }

-static const struct dev_pm_ops mmc_bus_pm_ops = {
-	.runtime_suspend	= mmc_runtime_suspend,
-	.runtime_resume		= mmc_runtime_resume,
-	.runtime_idle		= mmc_runtime_idle,
-};
-
-#define MMC_PM_OPS_PTR	(&mmc_bus_pm_ops)
-
  #else /* !CONFIG_PM_RUNTIME */

-#define MMC_PM_OPS_PTR	NULL
+#define mmc_runtime_suspend	NULL
+#define mmc_runtime_resume	NULL
+#define mmc_runtime_idle	NULL

You do not have to set these functions to NULL, the use of SET_RUNTIME_PM_OPS will fix that when !CONFIG_PM_RUNTIME


  #endif /* !CONFIG_PM_RUNTIME */

+static const struct dev_pm_ops mmc_bus_pm_ops = {
+	SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume,
+			mmc_runtime_idle)
+	SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
+};
+
  static struct bus_type mmc_bus_type = {
  	.name		= "mmc",
  	.dev_attrs	= mmc_dev_attrs,
@@ -186,9 +186,7 @@ static struct bus_type mmc_bus_type = {
  	.uevent		= mmc_bus_uevent,
  	.probe		= mmc_bus_probe,
  	.remove		= mmc_bus_remove,
-	.suspend	= mmc_bus_suspend,
-	.resume		= mmc_bus_resume,
-	.pm		= MMC_PM_OPS_PTR,
+	.pm		=&mmc_bus_pm_ops,
  };

  int mmc_register_bus(void)
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 1a1ca71..c984c9a 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -480,7 +480,7 @@ struct mmc_driver {
  	struct device_driver drv;
  	int (*probe)(struct mmc_card *);
  	void (*remove)(struct mmc_card *);
-	int (*suspend)(struct mmc_card *, pm_message_t);
+	int (*suspend)(struct mmc_card *);
  	int (*resume)(struct mmc_card *);
  };


Otherwise looks good!

Kind regards
Ulf Hansson
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