linux-kernel - [PATCH] davinci: vpif: add pm

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Message-Id: <1364460632-21697-1-git-send-email-prabhakar.csengg@gmail.com>
Date:	Thu, 28 Mar 2013 14:20:32 +0530
From:	Prabhakar lad <prabhakar.csengg@...il.com>
To:	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	LMML <linux-media@...r.kernel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Sakari Ailus <sakari.ailus@....fi>,
	"Lad, Prabhakar" <prabhakar.csengg@...il.com>
Subject: [PATCH] davinci: vpif: add pm_runtime support

From: Lad, Prabhakar <prabhakar.csengg@...il.com>

Add pm_runtime support to the TI Davinci VPIF driver.
Along side this patch replaces clk_get() with devm_clk_get()
to simplify the error handling.

Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
---
 drivers/media/platform/davinci/vpif.c |   21 +++++++++++----------
 1 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
index 28638a8..7d14625 100644
--- a/drivers/media/platform/davinci/vpif.c
+++ b/drivers/media/platform/davinci/vpif.c
@@ -25,6 +25,7 @@
 #include <linux/io.h>
 #include <linux/clk.h>
 #include <linux/err.h>
+#include <linux/pm_runtime.h>
 #include <linux/v4l2-dv-timings.h>
 
 #include <mach/hardware.h>
@@ -44,7 +45,6 @@ static struct resource	*res;
 spinlock_t vpif_lock;
 
 void __iomem *vpif_base;
-struct clk *vpif_clk;
 
 /**
  * ch_params: video standard configuration parameters for vpif
@@ -421,6 +421,7 @@ EXPORT_SYMBOL(vpif_channel_getfid);
 
 static int vpif_probe(struct platform_device *pdev)
 {
+	struct clk *vpif_clk;
 	int status = 0;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -439,12 +440,17 @@ static int vpif_probe(struct platform_device *pdev)
 		goto fail;
 	}
 
-	vpif_clk = clk_get(&pdev->dev, "vpif");
+	vpif_clk = devm_clk_get(&pdev->dev, "vpif");
 	if (IS_ERR(vpif_clk)) {
 		status = PTR_ERR(vpif_clk);
 		goto clk_fail;
 	}
-	clk_prepare_enable(vpif_clk);
+	clk_put(vpif_clk);
+
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_resume(&pdev->dev);
+
+	pm_runtime_get(&pdev->dev);
 
 	spin_lock_init(&vpif_lock);
 	dev_info(&pdev->dev, "vpif probe success\n");
@@ -459,11 +465,6 @@ fail:
 
 static int vpif_remove(struct platform_device *pdev)
 {
-	if (vpif_clk) {
-		clk_disable_unprepare(vpif_clk);
-		clk_put(vpif_clk);
-	}
-
 	iounmap(vpif_base);
 	release_mem_region(res->start, res_len);
 	return 0;
@@ -472,13 +473,13 @@ static int vpif_remove(struct platform_device *pdev)
 #ifdef CONFIG_PM
 static int vpif_suspend(struct device *dev)
 {
-	clk_disable_unprepare(vpif_clk);
+	pm_runtime_put(dev);
 	return 0;
 }
 
 static int vpif_resume(struct device *dev)
 {
-	clk_prepare_enable(vpif_clk);
+	pm_runtime_get(dev);
 	return 0;
 }
 
-- 
1.7.4.1

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