[PATCH 1/2] drm/mxsfb: Call drm_crtc_vblank_on/off

[Daniel Vetter]

On Wed, May 27, 2020 at 11:47:56AM +0200, Daniel Vetter wrote:
> mxsfb has vblank support, is atomic, but doesn't call
> drm_crtc_vblank_on/off as it should. Not good.
> 
> With my next patch to add the drm_crtc_vblank_reset to helpers this
> means not even the very first crtc enabling will vblanks work anymore,
> since they'll just stay off forever.
> 
> Since mxsfb doesn't have any vblank waits of its own in the
> enable/disable flow, nor an enable/disable_vblank callback we can do
> the on/off as the first respectively last operation, and it should all
> work.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
> Cc: Marek Vasut <marex at denx.de>
> Cc: Stefan Agner <stefan at agner.ch>
> Cc: Shawn Guo <shawnguo at kernel.org>
> Cc: Sascha Hauer <s.hauer at pengutronix.de>
> Cc: Pengutronix Kernel Team <kernel at pengutronix.de>
> Cc: Fabio Estevam <festevam at gmail.com>
> Cc: NXP Linux Team <linux-imx at nxp.com>
> Cc: linux-arm-kernel at lists.infradead.org

Ping for some ack/review on this one here, it's holding up the subsystem
wide fix in patch 2.

Thanks, Daniel

> ---
>  drivers/gpu/drm/mxsfb/mxsfb_drv.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> index 497cf443a9af..1891cd6deb2f 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> @@ -124,6 +124,7 @@ static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe,
>  	drm_panel_prepare(mxsfb->panel);
>  	mxsfb_crtc_enable(mxsfb);
>  	drm_panel_enable(mxsfb->panel);
> +	drm_crtc_vblank_on(&pipe->crtc);
>  }
>  
>  static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe)
> @@ -133,6 +134,7 @@ static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe)
>  	struct drm_crtc *crtc = &pipe->crtc;
>  	struct drm_pending_vblank_event *event;
>  
> +	drm_crtc_vblank_off(&pipe->crtc);
>  	drm_panel_disable(mxsfb->panel);
>  	mxsfb_crtc_disable(mxsfb);
>  	drm_panel_unprepare(mxsfb->panel);
> -- 
> 2.26.2
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch