[PATCH] davinci: vpif: add pm_runtime support

[Prabhakar lad]

From: Lad, Prabhakar <prabhakar.cse...@gmail.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.cse...@gmail.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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