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Date: Thu, 12 May 2011 19:11:04 +0200
From: Raffaele Recalcati <lamiaposta71@...il.com>
To: linux-pm@...ts.linux-foundation.org
Cc: davinci-linux-open-source@...ux.davincidsp.com,
linux-kernel@...r.kernel.org,
Davide Ciminaghi <ciminaghi@...dd.com>,
Raffaele Recalcati <raffaele.recalcati@...cino.it>
Subject: [PATCH 3/4] mmc: bus and block device drivers: support for pm_loss
From: Davide Ciminaghi <ciminaghi@...dd.com>
Signed-off-by: Davide Ciminaghi <ciminaghi@...dd.com>
Signed-off-by: Raffaele Recalcati <raffaele.recalcati@...cino.it>
---
drivers/mmc/card/block.c | 48 +++++++++++++++++++++++++++++++++++++++++++-
drivers/mmc/core/bus.c | 49 +++++++++++++++++++++++++++++++++++++++++----
2 files changed, 90 insertions(+), 7 deletions(-)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index bfc8a8a..c88afef 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -37,6 +37,9 @@
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>
+#include <linux/pm.h>
+#include <linux/pm_loss.h>
+
#include <asm/system.h>
#include <asm/uaccess.h>
@@ -755,14 +758,55 @@ static int mmc_blk_resume(struct mmc_card *card)
}
return 0;
}
-#else
+
+#ifdef CONFIG_PM_LOSS
+
+#define dev_to_mmc_card(d) container_of(d, struct mmc_card, dev)
+
+static int mmc_blk_power_changed(struct device *dev,
+ enum sys_power_state s)
+{
+ struct mmc_card *card = dev_to_mmc_card(dev);
+ struct mmc_blk_data *md = mmc_get_drvdata(card);
+
+ switch (s) {
+ case SYS_PWR_GOOD:
+ pr_debug_pm_loss("mmc_blk_power_changed(%d)\n", s);
+ mmc_blk_set_blksize(md, card);
+ mmc_queue_resume(&md->queue);
+ break;
+ case SYS_PWR_FAILING:
+ pr_debug_pm_loss("mmc_blk_power_changed(%d)\n", s);
+ mmc_queue_suspend(&md->queue);
+ break;
+ default:
+ BUG();
+ }
+ return 0;
+}
+
+static const struct dev_pm_ops mmc_blk_pm_ops = {
+ .power_changed = mmc_blk_power_changed,
+};
+
+#define MMC_BLK_DEV_PM_OPS_PTR (&mmc_blk_pm_ops)
+
+#else /* !CONFIG_PM_LOSS */
+
+#define MMC_BLK_DEV_PM_OPS_PTR NULL
+
+#endif /* !CONFIG_PM_LOSS */
+
+#else /* !CONFIG_PM */
#define mmc_blk_suspend NULL
#define mmc_blk_resume NULL
-#endif
+#define MMC_BLK_DEV_PM_OPS_PTR NULL
+#endif /* !CONFIG_PM */
static struct mmc_driver mmc_driver = {
.drv = {
.name = "mmcblk",
+ .pm = MMC_BLK_DEV_PM_OPS_PTR,
},
.probe = mmc_blk_probe,
.remove = mmc_blk_remove,
diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index 63667a8..548d3a9 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -19,6 +19,8 @@
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
+#include <linux/pm_loss.h>
+
#include "core.h"
#include "sdio_cis.h"
#include "bus.h"
@@ -163,19 +165,56 @@ static int mmc_runtime_idle(struct device *dev)
return pm_runtime_suspend(dev);
}
+#define MMC_PM_RUNTIME_OPS_INIT \
+.runtime_suspend = mmc_runtime_suspend, \
+.runtime_resume = mmc_runtime_resume, \
+.runtime_idle = mmc_runtime_idle,
+
+#else /* !CONFIG_PM_RUNTIME */
+
+#define MMC_PM_RUNTIME_OPS_INIT
+
+#endif /* !CONFIG_PM_RUNTIME */
+
+#ifdef CONFIG_PM_LOSS
+
+static int mmc_bus_power_changed(struct device *dev,
+ enum sys_power_state s)
+{
+ int ret = 0;
+
+ pr_debug_pm_loss("mmc_bus_power_changed()\n");
+
+ if (dev->driver && dev->driver->pm &&
+ dev->driver->pm->power_changed)
+ ret = dev->driver->pm->power_changed(dev, s);
+
+ return ret;
+}
+
+#define MMC_PM_LOSS_OPS_INIT \
+.power_changed = mmc_bus_power_changed,
+
+#else /* !CONFIG_PM_LOSS */
+
+#define MMC_PM_LOSS_OPS_INIT
+
+#endif /* !CONFIG_PM_LOSS */
+
+#if defined CONFIG_PM_RUNTIME || defined CONFIG_PM_LOSS
+
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,
+ MMC_PM_RUNTIME_OPS_INIT
+ MMC_PM_LOSS_OPS_INIT
};
#define MMC_PM_OPS_PTR (&mmc_bus_pm_ops)
-#else /* !CONFIG_PM_RUNTIME */
+#else /* !(CONFIG_PM_RUNTIME || CONFIG_PM_LOSS) */
#define MMC_PM_OPS_PTR NULL
-#endif /* !CONFIG_PM_RUNTIME */
+#endif /* !(CONFIG_PM_RUNTIME || CONFIG_PM_LOSS) */
static struct bus_type mmc_bus_type = {
.name = "mmc",
--
1.7.0.4
--
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