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Date:   Tue, 31 Jul 2018 11:34:40 +0100
From:   Liviu Dudau <liviu.dudau@arm.com>
To:     Souptick Joarder <jrdr.linux@gmail.com>
Cc:     brian.starkey@arm.com, malidp@foss.arm.com, airlied@linux.ie,
        gustavo@padovan.org, maarten.lankhorst@linux.intel.com,
        seanpaul@chromium.org, laurent.pinchart@ideasonboard.com,
        ajitn.linux@gmail.com, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org
Subject: Re: [PATCH] drm: Convert drm_atomic_helper_suspend/resume()
Message-ID: <20180731103440.GD17455@e110455-lin.cambridge.arm.com>
References: <20180730190137.GA25420@jordon-HP-15-Notebook-PC>
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User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
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Hi Souptick,

On Tue, Jul 31, 2018 at 12:31:37AM +0530, Souptick Joarder wrote:
> convert drm_atomic_helper_suspend/resume() to use
> drm_mode_config_helper_suspend/resume().
> 
> With this conversion, drm_fbdev_cma_set_suspend_unlocked()
> will left with no consumer. So this function can be removed.
> 
> Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
> Signed-off-by: Ajit Negi <ajitn.linux@gmail.com>
> ---
>  drivers/gpu/drm/arm/hdlcd_drv.c       | 26 ++------------------------
>  drivers/gpu/drm/drm_fb_cma_helper.c   | 18 ------------------
>  drivers/gpu/drm/rcar-du/rcar_du_drv.c | 21 ++-------------------
>  include/drm/drm_fb_cma_helper.h       |  2 --
>  4 files changed, 4 insertions(+), 63 deletions(-)
> 
> diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
> index feaa8bc..4e617e0 100644
> --- a/drivers/gpu/drm/arm/hdlcd_drv.c
> +++ b/drivers/gpu/drm/arm/hdlcd_drv.c
> @@ -427,37 +427,15 @@ static int hdlcd_remove(struct platform_device *pdev)
>  static int __maybe_unused hdlcd_pm_suspend(struct device *dev)
>  {
>  	struct drm_device *drm = dev_get_drvdata(dev);
> -	struct hdlcd_drm_private *hdlcd = drm ? drm->dev_private : NULL;
>  
> -	if (!hdlcd)
> -		return 0;
> -
> -	drm_kms_helper_poll_disable(drm);
> -	drm_fbdev_cma_set_suspend_unlocked(hdlcd->fbdev, 1);
> -
> -	hdlcd->state = drm_atomic_helper_suspend(drm);
> -	if (IS_ERR(hdlcd->state)) {
> -		drm_fbdev_cma_set_suspend_unlocked(hdlcd->fbdev, 0);
> -		drm_kms_helper_poll_enable(drm);
> -		return PTR_ERR(hdlcd->state);
> -	}
> -
> -	return 0;
> +	return drm_mode_config_helper_suspend(drm);
>  }
>  
>  static int __maybe_unused hdlcd_pm_resume(struct device *dev)
>  {
>  	struct drm_device *drm = dev_get_drvdata(dev);
> -	struct hdlcd_drm_private *hdlcd = drm ? drm->dev_private : NULL;
> -
> -	if (!hdlcd)
> -		return 0;
>  
> -	drm_atomic_helper_resume(drm, hdlcd->state);
> -	drm_fbdev_cma_set_suspend_unlocked(hdlcd->fbdev, 0);
> -	drm_kms_helper_poll_enable(drm);
> -
> -	return 0;
> +	return drm_mode_config_helper_resume(drm);
>  }

This patch is similar to the one Noralf Trønnes submitted, and his is
also cleaning up the state variable in hdlcd_drm_private. The patch has
been queued as commit f69d9686e5d9 in git://linux-arm.org/linux-ld.git
for-upstream/hdlcd and I will send a pull request today for it.

Best regards,
Liviu

>  
>  static SIMPLE_DEV_PM_OPS(hdlcd_pm_ops, hdlcd_pm_suspend, hdlcd_pm_resume);
> diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c
> index 186d00a..f604a84 100644
> --- a/drivers/gpu/drm/drm_fb_cma_helper.c
> +++ b/drivers/gpu/drm/drm_fb_cma_helper.c
> @@ -529,21 +529,3 @@ void drm_fbdev_cma_set_suspend(struct drm_fbdev_cma *fbdev_cma, bool state)
>  		drm_fb_helper_set_suspend(&fbdev_cma->fb_helper, state);
>  }
>  EXPORT_SYMBOL(drm_fbdev_cma_set_suspend);
> -
> -/**
> - * drm_fbdev_cma_set_suspend_unlocked - wrapper around
> - *                                      drm_fb_helper_set_suspend_unlocked
> - * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
> - * @state: desired state, zero to resume, non-zero to suspend
> - *
> - * Calls drm_fb_helper_set_suspend, which is a wrapper around
> - * fb_set_suspend implemented by fbdev core.
> - */
> -void drm_fbdev_cma_set_suspend_unlocked(struct drm_fbdev_cma *fbdev_cma,
> -					bool state)
> -{
> -	if (fbdev_cma)
> -		drm_fb_helper_set_suspend_unlocked(&fbdev_cma->fb_helper,
> -						   state);
> -}
> -EXPORT_SYMBOL(drm_fbdev_cma_set_suspend_unlocked);
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> index 02aee6c..288220f 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> @@ -357,32 +357,15 @@ static void rcar_du_lastclose(struct drm_device *dev)
>  static int rcar_du_pm_suspend(struct device *dev)
>  {
>  	struct rcar_du_device *rcdu = dev_get_drvdata(dev);
> -	struct drm_atomic_state *state;
>  
> -	drm_kms_helper_poll_disable(rcdu->ddev);
> -	drm_fbdev_cma_set_suspend_unlocked(rcdu->fbdev, true);
> -
> -	state = drm_atomic_helper_suspend(rcdu->ddev);
> -	if (IS_ERR(state)) {
> -		drm_fbdev_cma_set_suspend_unlocked(rcdu->fbdev, false);
> -		drm_kms_helper_poll_enable(rcdu->ddev);
> -		return PTR_ERR(state);
> -	}
> -
> -	rcdu->suspend_state = state;
> -
> -	return 0;
> +	return drm_mode_config_helper_suspend(rcdu->ddev);
>  }
>  
>  static int rcar_du_pm_resume(struct device *dev)
>  {
>  	struct rcar_du_device *rcdu = dev_get_drvdata(dev);
>  
> -	drm_atomic_helper_resume(rcdu->ddev, rcdu->suspend_state);
> -	drm_fbdev_cma_set_suspend_unlocked(rcdu->fbdev, false);
> -	drm_kms_helper_poll_enable(rcdu->ddev);
> -
> -	return 0;
> +	return drm_mode_config_helper_resume(rcdu->ddev);
>  }
>  #endif
>  
> diff --git a/include/drm/drm_fb_cma_helper.h b/include/drm/drm_fb_cma_helper.h
> index d532f88a..15c4569 100644
> --- a/include/drm/drm_fb_cma_helper.h
> +++ b/include/drm/drm_fb_cma_helper.h
> @@ -33,8 +33,6 @@ struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
>  void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_cma);
>  void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma);
>  void drm_fbdev_cma_set_suspend(struct drm_fbdev_cma *fbdev_cma, bool state);
> -void drm_fbdev_cma_set_suspend_unlocked(struct drm_fbdev_cma *fbdev_cma,
> -					bool state);
>  
>  struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
>  	unsigned int plane);
> -- 
> 1.9.1
> 

-- 
====================
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| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
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