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Subject: Re: [PATCH v3] gpu/drm/exynos: Convert
 drm_atomic_helper_suspend/resume()
To:     Souptick Joarder <jrdr.linux@gmail.com>, inki.dae@samsung.com,
        jy0922.shim@samsung.com, sw0312.kim@samsung.com,
        kyungmin.park@samsung.com, airlied@linux.ie, kgene@kernel.org,
        krzk@kernel.org, ajitn.linux@gmail.com
Cc:     dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org
From:   Marek Szyprowski <m.szyprowski@samsung.com>
Date:   Thu, 2 Aug 2018 15:38:51 +0200
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References: <CGME20180802131924epcas4p105dc354b2ee651e70a5e777850222bc5@epcas4p1.samsung.com>
        <20180802132152.GA2833@jordon-HP-15-Notebook-PC>
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Hi,

On 2018-08-02 15:21, Souptick Joarder wrote:
> convert drm_atomic_helper_suspend/resume() to use
> drm_mode_config_helper_suspend/resume().
>
> exynos_drm_fbdev_suspend/resume can be removed
> as drm_mode_config_helper_suspend/resume has
> implement the same in generic way.
>
> Remove suspend_state from exynos_drm_private
> struct as it is no more useful.
>
> Signed-off-by: Ajit Negi <ajitn.linux@gmail.com>
> Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
> v2: Address Inki Dae's comment. Remove ret variable
>      from both suspend/resume function.
>
> v3: Tested by Marek. Updated the change log.
>
>   drivers/gpu/drm/exynos/exynos_drm_drv.c   | 26 ++------------------------
>   drivers/gpu/drm/exynos/exynos_drm_drv.h   |  1 -
>   drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 17 -----------------
>   drivers/gpu/drm/exynos/exynos_drm_fbdev.h | 10 ----------
>   4 files changed, 2 insertions(+), 52 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> index b599f74..d86dd81 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> @@ -149,37 +149,15 @@ static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file)
>   static int exynos_drm_suspend(struct device *dev)
>   {
>   	struct drm_device *drm_dev = dev_get_drvdata(dev);
> -	struct exynos_drm_private *private;
> -
> -	if (!drm_dev)
> -		return 0;
> -
> -	private = drm_dev->dev_private;
> -
> -	drm_kms_helper_poll_disable(drm_dev);
> -	exynos_drm_fbdev_suspend(drm_dev);
> -	private->suspend_state = drm_atomic_helper_suspend(drm_dev);
> -	if (IS_ERR(private->suspend_state)) {
> -		exynos_drm_fbdev_resume(drm_dev);
> -		drm_kms_helper_poll_enable(drm_dev);
> -		return PTR_ERR(private->suspend_state);
> -	}
>   
> -	return 0;
> +	return  drm_mode_config_helper_suspend(drm_dev);
>   }
>   
>   static void exynos_drm_resume(struct device *dev)
>   {
>   	struct drm_device *drm_dev = dev_get_drvdata(dev);
> -	struct exynos_drm_private *private;
> -
> -	if (!drm_dev)
> -		return;
>   
> -	private = drm_dev->dev_private;
> -	drm_atomic_helper_resume(drm_dev, private->suspend_state);
> -	exynos_drm_fbdev_resume(drm_dev);
> -	drm_kms_helper_poll_enable(drm_dev);
> +	return drm_mode_config_helper_resume(drm_dev);

exynos_drm_resume() now returns 'void', so to be strict with
c standard, the return statement should not be used here.

>   }
>   
>   static const struct dev_pm_ops exynos_drm_pm_ops = {
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
> index c737c4b..7349e7c 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
> @@ -195,7 +195,6 @@ struct drm_exynos_file_private {
>    */
>   struct exynos_drm_private {
>   	struct drm_fb_helper *fb_helper;
> -	struct drm_atomic_state *suspend_state;
>   
>   	struct device *g2d_dev;
>   	struct device *dma_dev;
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> index 132dd52..918dd2c 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> @@ -270,20 +270,3 @@ void exynos_drm_fbdev_fini(struct drm_device *dev)
>   	private->fb_helper = NULL;
>   }
>   
> -void exynos_drm_fbdev_suspend(struct drm_device *dev)
> -{
> -	struct exynos_drm_private *private = dev->dev_private;
> -
> -	console_lock();
> -	drm_fb_helper_set_suspend(private->fb_helper, 1);
> -	console_unlock();
> -}
> -
> -void exynos_drm_fbdev_resume(struct drm_device *dev)
> -{
> -	struct exynos_drm_private *private = dev->dev_private;
> -
> -	console_lock();
> -	drm_fb_helper_set_suspend(private->fb_helper, 0);
> -	console_unlock();
> -}
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.h b/drivers/gpu/drm/exynos/exynos_drm_fbdev.h
> index b338472..6840b6a 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.h
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.h
> @@ -19,8 +19,6 @@
>   
>   int exynos_drm_fbdev_init(struct drm_device *dev);
>   void exynos_drm_fbdev_fini(struct drm_device *dev);
> -void exynos_drm_fbdev_suspend(struct drm_device *drm);
> -void exynos_drm_fbdev_resume(struct drm_device *drm);
>   
>   #else
>   
> @@ -39,14 +37,6 @@ static inline void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
>   
>   #define exynos_drm_output_poll_changed (NULL)
>   
> -static inline void exynos_drm_fbdev_suspend(struct drm_device *drm)
> -{
> -}
> -
> -static inline void exynos_drm_fbdev_resume(struct drm_device *drm)
> -{
> -}
> -
>   #endif
>   
>   #endif

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland