linux-kernel - Re: [PATCH v3 2/4] drm/mxsfb: Add pm_runtime calls to pipe

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Date:   Tue, 07 Aug 2018 20:32:06 +0200
From:   Stefan Agner <stefan@...er.ch>
To:     Leonard Crestez <leonard.crestez@....com>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Marek Vasut <marex@...x.de>, Shawn Guo <shawnguo@...nel.org>,
        Fabio Estevam <fabio.estevam@....com>,
        Robert Chiras <robert.chiras@....com>,
        Mirela Rabulea <mirela.rabulea@....com>,
        Anson Huang <Anson.Huang@....com>,
        dri-devel@...ts.freedesktop.org,
        Dong Aisheng <aisheng.dong@....com>, linux-imx@....com,
        kernel@...gutronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/4] drm/mxsfb: Add pm_runtime calls to
 pipe_enable/disable

On 06.08.2018 21:31, Leonard Crestez wrote:
> Adding lcdif nodes to a power domain currently results in
> black/corrupted screens or hangs because power is not correctly enabled
> when required.
> 
> Ensure power is on when display is active by adding
> pm_runtime_get/put_sync to mxsfb_pipe_enable/disable.
> 
> Signed-off-by: Leonard Crestez <leonard.crestez@....com>

Reviewed-by: Stefan Agner <stefan@...er.ch>

> ---
>  drivers/gpu/drm/mxsfb/mxsfb_drv.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> index ffe5137ccaf8..68d79f5dc0d3 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> @@ -101,23 +101,27 @@ static const struct drm_mode_config_funcs
> mxsfb_mode_config_funcs = {
>  static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe,
>  			      struct drm_crtc_state *crtc_state,
>  			      struct drm_plane_state *plane_state)
>  {
>  	struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
> +	struct drm_device *drm = pipe->plane.dev;
>  
> +	pm_runtime_get_sync(drm->dev);
>  	drm_panel_prepare(mxsfb->panel);
>  	mxsfb_crtc_enable(mxsfb);
>  	drm_panel_enable(mxsfb->panel);
>  }
>  
>  static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe)
>  {
>  	struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
> +	struct drm_device *drm = pipe->plane.dev;
>  
>  	drm_panel_disable(mxsfb->panel);
>  	mxsfb_crtc_disable(mxsfb);
>  	drm_panel_unprepare(mxsfb->panel);
> +	pm_runtime_put_sync(drm->dev);
>  }
>  
>  static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe,
>  			      struct drm_plane_state *plane_state)
>  {