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Subject: Re: [PATCH v2] gpu/drm/exynos: Convert
 drm_atomic_helper_suspend/resume()
To:     Souptick Joarder <jrdr.linux@gmail.com>,
        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,
        Daniel Vetter <daniel@ffwll.ch>
Cc:     dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
        Ajit Linux <ajitn.linux@gmail.com>,
        Sabyasachi Gupta <sabyasachi.linux@gmail.com>,
        Brajeswar Ghosh <brajeswar.linux@gmail.com>
From:   Marek Szyprowski <m.szyprowski@samsung.com>
Date:   Thu, 2 Aug 2018 08:47:13 +0200
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Hi Souptick,

On 2018-08-02 08:25, Souptick Joarder wrote:
> On Thu, Jul 26, 2018 at 9:24 PM, Souptick Joarder <jrdr.linux@gmail.com> 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.
>>
>> Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
>> Signed-off-by: Ajit Negi <ajitn.linux@gmail.com>
>> ---
>> v2: Address Inki Dae's comment. Remove
>>      ret variable from both suspend/resume
>>      function.
>>
> Any further comment on this patch ?

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>

However you need to rebase onto current drm-next, because there have
been some changes, which prevent this patch from applying.

pm_runtime_suspended(dev) checks were useless and have been removed,
what simplifies suspend/resume functions even more. Now it is too
late for v4.19 merge window, so this patch will have to wait for
v4.20.

>>   drivers/gpu/drm/exynos/exynos_drm_drv.c   | 26 ++++----------------------
>>   drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 17 -----------------
>>   drivers/gpu/drm/exynos/exynos_drm_fbdev.h | 10 ----------
>>   3 files changed, 4 insertions(+), 49 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
>> index a81b4a5..46d28cd 100644
>> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
>> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
>> @@ -151,39 +151,21 @@ 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 (pm_runtime_suspended(dev) || !drm_dev)
>> +       if (pm_runtime_suspended(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 int exynos_drm_resume(struct device *dev)
>>   {
>>          struct drm_device *drm_dev = dev_get_drvdata(dev);
>> -       struct exynos_drm_private *private;
>>
>> -       if (pm_runtime_suspended(dev) || !drm_dev)
>> +       if (pm_runtime_suspended(dev))
>>                  return 0;
>>
>> -       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 0;
>> +       return drm_mode_config_helper_resume(drm_dev);
>>   }
>>   #endif
>>
>> 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
>> --
>> 1.9.1
>>
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>

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