linux-kernel - Re: [PATCH] drm/rcar-du: Convert drm_atomic_helper

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Date:   Sat, 28 Jul 2018 23:20:05 +0530
From:   Vaishali Thakkar <vthakkar@...shalithakkar.in>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        airlied@...ux.ie, ajitn.linux@...il.com,
        dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH] drm/rcar-du: Convert drm_atomic_helper_suspend/resume()

On Sat, Jul 28, 2018 at 9:10 PM, Souptick Joarder <jrdr.linux@...il.com> wrote:
> convert drm_atomic_helper_suspend/resume() to use
> drm_mode_config_helper_suspend/resume().

Hi Souptick,

Thanks for your patch.

> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
> Signed-off-by: Ajit Negi <ajitn.linux@...il.com>
> ---
>  drivers/gpu/drm/rcar-du/rcar_du_drv.c | 21 ++-------------------
>  1 file changed, 2 insertions(+), 19 deletions(-)
>
> 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);

I don't think we can use drm_mode_config_helper_(suspend/resume)
API here as this file uses CMA functions. And from git grep it seems that
there are very few drivers using it at the moment, so not sure if introducing
new API functions similar to  drm_mode_config will make sense or not.

Thanks.

> -               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
>
> --
> 1.9.1
>