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From:   Souptick Joarder <jrdr.linux@gmail.com>
Date:   Sat, 4 Aug 2018 20:02:30 +0530
Message-ID: <CAFqt6zYxV6K4oZUXVaYLifx3xqPxPs9v5-BmAOfm6hG04g6hvA@mail.gmail.com>
Subject: Re: [PATCH v3] gpu/drm/exynos: Convert drm_atomic_helper_suspend/resume()
To:     Marek Szyprowski <m.szyprowski@samsung.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
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On Fri, Aug 3, 2018 at 12:30 PM, Marek Szyprowski
<m.szyprowski@samsung.com> wrote:
> 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.

Ok, then v4 is the right candidate to go.

>
>> 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
>