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Date: Fri, 3 Aug 2018 09:00:08 +0200
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: Souptick Joarder <jrdr.linux@...il.com>
Cc: Inki Dae <inki.dae@...sung.com>, jy0922.shim@...sung.com,
sw0312.kim@...sung.com, Kyungmin Park <kyungmin.park@...sung.com>,
airlied@...ux.ie, kgene@...nel.org, krzk@...nel.org,
Ajit Linux <ajitn.linux@...il.com>,
dri-devel@...ts.freedesktop.org,
linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] gpu/drm/exynos: Convert
drm_atomic_helper_suspend/resume()
Hi,
On 2018-08-02 17:51, Souptick Joarder wrote:
> On Thu, Aug 2, 2018 at 7:08 PM, Marek Szyprowski
> <m.szyprowski@...sung.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@...il.com>
>>> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
>>> Tested-by: Marek Szyprowski <m.szyprowski@...sung.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
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