linux-kernel - [PATCH v5 4/4] ata: ahci_platform: runtime resume the device before use

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Message-ID: <1390228888-5537-5-git-send-email-rogerq@ti.com>
Date:	Mon, 20 Jan 2014 16:41:28 +0200
From:	Roger Quadros <rogerq@...com>
To:	<tj@...nel.org>
CC:	<sergei.shtylyov@...entembedded.com>, <kishon@...com>,
	<b.zolnierkie@...sung.com>, <hdegoede@...hat.com>, <arnd@...db.de>,
	<linux-ide@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>, Roger Quadros <rogerq@...com>,
	Balaji T K <balajitk@...com>
Subject: [PATCH v5 4/4] ata: ahci_platform: runtime resume the device before use

On OMAP platforms the device needs to be runtime resumed before
it can be accessed. The OMAP HWMOD framework takes care of
enabling the module and its resources based on the
device's runtime PM state.

In this patch we runtime resume during .probe() and runtime suspend
during .remove() (i.e. ahci_host_stop()).

We also update the runtime PM state during .resume().

Signed-off-by: Roger Quadros <rogerq@...com>
Signed-off-by: Balaji T K <balajitk@...com>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
---
 drivers/ata/ahci_platform.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index 580567f..b3a48bb 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -23,6 +23,7 @@
 #include <linux/platform_device.h>
 #include <linux/libata.h>
 #include <linux/ahci_platform.h>
+#include <linux/pm_runtime.h>
 #include "ahci.h"
 
 static void ahci_host_stop(struct ata_host *host);
@@ -142,6 +143,9 @@ static int ahci_probe(struct platform_device *pdev)
 		}
 	}
 
+	pm_runtime_enable(dev);
+	pm_runtime_get_sync(dev);
+
 	hpriv->phy = devm_phy_get(dev, "sata-phy");
 	if (IS_ERR(hpriv->phy)) {
 		rc = PTR_ERR(hpriv->phy);
@@ -285,6 +289,9 @@ static void ahci_host_stop(struct ata_host *host)
 		clk_disable_unprepare(hpriv->clk);
 		clk_put(hpriv->clk);
 	}
+
+	pm_runtime_put_sync(dev);
+	pm_runtime_disable(dev);
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -356,6 +363,11 @@ static int ahci_resume(struct device *dev)
 
 	ata_host_resume(host);
 
+	/* We resumed so update PM runtime state */
+	pm_runtime_disable(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
 	return 0;
 
 disable_unprepare_clk:
-- 
1.8.3.2

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