[Meego-kernel] [PATCH 18/26] mmc: add runtime PM handlers

[Brouat, Claude]

>From 7f7a877143abc25a02879918a79d87c736268bb4 Mon Sep 17 00:00:00 2001
From: Denis Robert <denis.robert at intel.com>
Date: Wed, 20 Oct 2010 18:19:42 +0200
Subject: [PATCH 18/26] mmc: add runtime PM handlers

Add MMC runtime PM handlers, which call mmc_power_save_host
and mmc_power_restore_host in response to runtime_suspend and
runtime_resume events.

Runtime PM is still disabled by default, so this patch alone
has no immediate effect.

Signed-off-by: Ohad Ben-Cohen <ohad at wizery.com>
Signed-off-by: Denis Robert <denis.robert at intel.com>
Signed-off-by: Claude Brouat <claude.brouat at intel.com>
---
 drivers/mmc/core/bus.c |   37 +++++++++++++++++++++++++++++++++++++
 1 files changed, 37 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index 49d9dca..551eecc 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -14,6 +14,7 @@
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/slab.h>
+#include <linux/pm_runtime.h>

 #include <linux/mmc/card.h>
 #include <linux/mmc/host.h>
@@ -137,6 +138,41 @@ static int mmc_bus_resume(struct device *dev)
     return ret;
 }

+#ifdef CONFIG_PM_RUNTIME
+
+static int mmc_runtime_suspend(struct device *dev)
+{
+    struct mmc_card *card = dev_to_mmc_card(dev);
+
+    return mmc_power_save_host(card->host);
+}
+
+static int mmc_runtime_resume(struct device *dev)
+{
+    struct mmc_card *card = dev_to_mmc_card(dev);
+
+    return mmc_power_restore_host(card->host);
+}
+
+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
+
+#endif /* !CONFIG_PM_RUNTIME */
+
 static struct bus_type mmc_bus_type = {
     .name      = "mmc",
     .dev_attrs = mmc_dev_attrs,
@@ -146,6 +182,7 @@ static struct bus_type mmc_bus_type = {
     .remove         = mmc_bus_remove,
     .suspend   = mmc_bus_suspend,
     .resume         = mmc_bus_resume,
+    .pm        = MMC_PM_OPS_PTR,
 };

 int mmc_register_bus(void)
--
1.6.3.3




Claude BROUAT
UMG/MIPE/WSIV  System Integrator
Office:    +33 (0)1 72 21 04 54
mailto: mailto:claude.brouat at intel.com

Intel Corp. SAS
134, av du Général Eisenhower
BP 73586
31100 TOULOUSE
France



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