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Date: Sat, 4 Aug 2018 20:02:30 +0530
From: Souptick Joarder <jrdr.linux@...il.com>
To: Marek Szyprowski <m.szyprowski@...sung.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()
On Fri, Aug 3, 2018 at 12:30 PM, Marek Szyprowski
<m.szyprowski@...sung.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@...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.
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
>>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
>> the body of a message to majordomo@...r.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
>>
>
> Best regards
> --
> Marek Szyprowski, PhD
> Samsung R&D Institute Poland
>
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