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Subject: Re: [PATCH v3] gpu/drm/exynos: Convert
 drm_atomic_helper_suspend/resume()
To:     Souptick Joarder <jrdr.linux@gmail.com>
Cc:     Inki Dae <inki.dae@samsung.com>, jy0922.shim@samsung.com,
        sw0312.kim@samsung.com, Kyungmin Park <kyungmin.park@samsung.com>,
        airlied@linux.ie, kgene@kernel.org, krzk@kernel.org,
        Ajit Linux <ajitn.linux@gmail.com>,
        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:   Fri, 3 Aug 2018 09:00:08 +0200
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Hi,

On 2018-08-02 17:51, Souptick Joarder wrote:
> On Thu, Aug 2, 2018 at 7:08 PM, Marek Szyprowski
> <m.szyprowski@samsung.com> wrote:
>> 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.
> But in struct dev_pm_ops, it is still defined as
>
>                  int (*resume)(struct device *dev);
>
> I think, we need to correct the return type of
> exynos_drm_resume() to int.

Nope. After commit dc684af6fc8d ("drm/exynos: Suspend/resume display
pipeline as early/late as possible") exynos_drm_resume() is assigned
to .complete callback, which use 'void' return type, so for now no
more changes are needed.

> Although I posted v4.
>
>
>>>    }
>>>
>>>    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
>>
> --
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>

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