Re: [PATCH] backlight: pwm_bl: move suspend/resume entries fromplatform_driver to driver.pm

[Eric Miao]

On Thu, Dec 1, 2011 at 9:53 AM, Barry Song <Barry.Song@xxxxxxx> wrote:
> From: Xiangzhen Ye <Xiangzhen.Ye@xxxxxxx>
>
> At first, people are moving suspend/resume entries from platform_driver
> to driver.pm for many drivers.
> On the other hand, if we use swsusp to do hibernation for an embedded
> system using pwm_bl, in the process of preparing snapshot, backlight
> will be off and make lcd black screen. This gives bad user experiences.
> This patch will fix this issue as swsusp will go to call pm.freeze()
> but not platform_driver.suspend. we have no pm.freeze() for pwm_bl, so
> the lcd black screen will disappear.
>
> Signed-off-by: Xiangzhen Ye <Xiangzhen.Ye@xxxxxxx>
> Signed-off-by: Barry Song <Baohua.Song@xxxxxxx>

Acked-by: Eric Miao <eric.y.miao@xxxxxxxxx>

> ---
> Âdrivers/video/backlight/pwm_bl.c | Â 15 ++++++++++-----
> Â1 files changed, 10 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
> index 8b5b2a4..50f3134 100644
> --- a/drivers/video/backlight/pwm_bl.c
> +++ b/drivers/video/backlight/pwm_bl.c
> @@ -169,9 +169,9 @@ static int pwm_backlight_remove(struct platform_device *pdev)
> Â}
>
> Â#ifdef CONFIG_PM
> -static int pwm_backlight_suspend(struct platform_device *pdev,
> - Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Âpm_message_t state)
> +static int pwm_backlight_suspend(struct device *dev)
> Â{
> + Â Â Â struct platform_device *pdev = to_platform_device(dev);
> Â Â Â Âstruct backlight_device *bl = platform_get_drvdata(pdev);
> Â Â Â Âstruct pwm_bl_data *pb = dev_get_drvdata(&bl->dev);
>
> @@ -184,8 +184,9 @@ static int pwm_backlight_suspend(struct platform_device *pdev,
> Â Â Â Âreturn 0;
> Â}
>
> -static int pwm_backlight_resume(struct platform_device *pdev)
> +static int pwm_backlight_resume(struct device *dev)
> Â{
> + Â Â Â struct platform_device *pdev = to_platform_device(dev);
> Â Â Â Âstruct backlight_device *bl = platform_get_drvdata(pdev);
>
> Â Â Â Âbacklight_update_status(bl);
> @@ -196,15 +197,19 @@ static int pwm_backlight_resume(struct platform_device *pdev)
> Â#define pwm_backlight_resume  NULL
> Â#endif
>
> +static const struct dev_pm_ops pwm_backlight_pm_ops = {
> + Â Â Â .suspend = pwm_backlight_suspend,
> + Â Â Â .resume = pwm_backlight_resume,
> +};
> +
> Âstatic struct platform_driver pwm_backlight_driver = {
>    Â.driver     = {
>        Â.name  = "pwm-backlight",
> Â Â Â Â Â Â Â Â.owner Â= THIS_MODULE,
> +        .pm   = &pwm_backlight_pm_ops,
> Â Â Â Â},
>    Â.probe     Â= pwm_backlight_probe,
>    Â.remove     = pwm_backlight_remove,
> -    .suspend    Â= pwm_backlight_suspend,
> -    .resume     = pwm_backlight_resume,
> Â};
>
> Âstatic int __init pwm_backlight_init(void)
> --
> 1.7.1
>
>
>
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