linux-kernel - Re: [PATCH v2 17/26] drm: rcar-du: Remove #ifdef guards for PM related functions

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Message-ID: <Y4Zg9yg7KP0yCPIL@pendragon.ideasonboard.com>
Date:   Tue, 29 Nov 2022 21:43:51 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH v2 17/26] drm: rcar-du: Remove #ifdef guards for PM
 related functions

Hi Paul,

Thank you for the patch.

On Tue, Nov 29, 2022 at 07:19:33PM +0000, Paul Cercueil wrote:
> Use the DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr() macros to handle
> the .suspend/.resume callbacks.
> 
> These macros allow the suspend and resume functions to be automatically
> dropped by the compiler when CONFIG_SUSPEND is disabled, without having
> to use #ifdef guards.
> 
> This has the advantage of always compiling these functions in,
> independently of any Kconfig option. Thanks to that, bugs and other
> regressions are subsequently easier to catch.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>

Will you get this whole series merged in one go in drm-misc, or do you
expect me to take this patch in my tree ? I'd prefer the first option if
possible (less work for me :-)).

> ---
> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> Cc: linux-renesas-soc@...r.kernel.org
> ---
>  drivers/gpu/drm/rcar-du/rcar_du_drv.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> index d003e8d9e7a2..eeec1e02446f 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> @@ -599,7 +599,6 @@ static const struct drm_driver rcar_du_driver = {
>   * Power management
>   */
>  
> -#ifdef CONFIG_PM_SLEEP
>  static int rcar_du_pm_suspend(struct device *dev)
>  {
>  	struct rcar_du_device *rcdu = dev_get_drvdata(dev);
> @@ -613,11 +612,9 @@ static int rcar_du_pm_resume(struct device *dev)
>  
>  	return drm_mode_config_helper_resume(&rcdu->ddev);
>  }
> -#endif
>  
> -static const struct dev_pm_ops rcar_du_pm_ops = {
> -	SET_SYSTEM_SLEEP_PM_OPS(rcar_du_pm_suspend, rcar_du_pm_resume)
> -};
> +static DEFINE_SIMPLE_DEV_PM_OPS(rcar_du_pm_ops,
> +				rcar_du_pm_suspend, rcar_du_pm_resume);
>  
>  /* -----------------------------------------------------------------------------
>   * Platform driver
> @@ -712,7 +709,7 @@ static struct platform_driver rcar_du_platform_driver = {
>  	.shutdown	= rcar_du_shutdown,
>  	.driver		= {
>  		.name	= "rcar-du",
> -		.pm	= &rcar_du_pm_ops,
> +		.pm	= pm_sleep_ptr(&rcar_du_pm_ops),
>  		.of_match_table = rcar_du_of_table,
>  	},
>  };

-- 
Regards,

Laurent Pinchart