On Mon 1 April 2013 08:36:50 Prabhakar lad wrote:
> From: Lad, Prabhakar <prabhakar.csengg@xxxxxxxxx>
>
> Add pm_runtime support to the TI Davinci VPIF driver.
>
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@xxxxxxxxx>
> Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
> Cc: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Cc: Sakari Ailus <sakari.ailus@xxxxxx>
> Cc: Sekhar Nori <nsekhar@xxxxxx>
> ---
> Changes for v2:
> 1: Removed use of clk API as pointed by Laurent and Sekhar.
>
> drivers/media/platform/davinci/vpif.c | 24 +++++++-----------------
> 1 files changed, 7 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
> index 28638a8..599cabb 100644
> --- a/drivers/media/platform/davinci/vpif.c
> +++ b/drivers/media/platform/davinci/vpif.c
> @@ -23,8 +23,8 @@
> #include <linux/spinlock.h>
> #include <linux/kernel.h>
> #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 +44,6 @@ static struct resource *res;
> spinlock_t vpif_lock;
>
> void __iomem *vpif_base;
> -struct clk *vpif_clk;
>
> /**
> * ch_params: video standard configuration parameters for vpif
> @@ -439,19 +438,15 @@ static int vpif_probe(struct platform_device *pdev)
> goto fail;
> }
>
> - vpif_clk = clk_get(&pdev->dev, "vpif");
> - if (IS_ERR(vpif_clk)) {
> - status = PTR_ERR(vpif_clk);
> - goto clk_fail;
> - }
> - clk_prepare_enable(vpif_clk);
> + pm_runtime_enable(&pdev->dev);
> + pm_runtime_resume(&pdev->dev);
> +
> + pm_runtime_get(&pdev->dev);
pm_runtime_get() calls pm_runtime_resume() if needed, so is the call to resume()
really necessary?
Regards,
Hans
>
> spin_lock_init(&vpif_lock);
> dev_info(&pdev->dev, "vpif probe success\n");
> return 0;
>
> -clk_fail:
> - iounmap(vpif_base);
> fail:
> release_mem_region(res->start, res_len);
> return status;
> @@ -459,11 +454,6 @@ 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 +462,13 @@ 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;
> }
>
>
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