linux-kernel - Re: [PATCH 14/23] drm: omapdrm: crtc: save framedone callback from dss

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Date:	Sat, 26 Mar 2016 19:03 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Sebastian Reichel <sre@...nel.org>
Cc:	Tony Lindgren <tony@...mide.com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	David Airlie <airlied@...ux.ie>, linux-omap@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/23] drm: omapdrm: crtc: save framedone callback from dss

Hi Sebastian,

Thank you for the patch.

On Tuesday 08 Mar 2016 17:39:46 Sebastian Reichel wrote:
> Save the framedone callback supplied by dss for later
> usage.

We already have too many callbacks in the driver, making the code difficult to 
understand. Wouldn't it be possible to cal directly from the omapdrm driver 
into the dss code without using callbacks ?

> Signed-off-by: Sebastian Reichel <sre@...nel.org>
> ---
>  drivers/gpu/drm/omapdrm/omap_crtc.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.c
> b/drivers/gpu/drm/omapdrm/omap_crtc.c index 094e89a2fa94..3ce7143e5a5f
> 100644
> --- a/drivers/gpu/drm/omapdrm/omap_crtc.c
> +++ b/drivers/gpu/drm/omapdrm/omap_crtc.c
> @@ -57,6 +57,9 @@ struct omap_crtc {
> 
>  	unsigned long state;
>  	wait_queue_head_t pending_wait;
> +
> +	void (*framedone_handler)(void *);
> +	void *framedone_handler_data;
>  };
> 
>  /*
> ---------------------------------------------------------------------------
> -- @@ -263,6 +266,17 @@ static int omap_crtc_dss_register_framedone(
>  		struct omap_overlay_manager *mgr,
>  		void (*handler)(void *), void *data)
>  {
> +	struct omap_crtc *omap_crtc = omap_crtcs[mgr->id];
> +	struct drm_device *dev = omap_crtc->base.dev;
> +
> +	if (omap_crtc->framedone_handler)
> +		return -EBUSY;
> +
> +	dev_dbg(dev->dev, "register framedone %s", omap_crtc->name);
> +
> +	omap_crtc->framedone_handler = handler;
> +	omap_crtc->framedone_handler_data = data;
> +
>  	return 0;
>  }
> 
> @@ -270,6 +284,16 @@ static void omap_crtc_dss_unregister_framedone(
>  		struct omap_overlay_manager *mgr,
>  		void (*handler)(void *), void *data)
>  {
> +	struct omap_crtc *omap_crtc = omap_crtcs[mgr->id];
> +	struct drm_device *dev = omap_crtc->base.dev;
> +
> +	dev_dbg(dev->dev, "unregister framedone %s", omap_crtc->name);
> +
> +	WARN_ON(omap_crtc->framedone_handler != handler);
> +	WARN_ON(omap_crtc->framedone_handler_data != data);
> +
> +	omap_crtc->framedone_handler = NULL;
> +	omap_crtc->framedone_handler_data = NULL;
>  }
> 
>  static const struct dss_mgr_ops mgr_ops = {

-- 
Regards,

Laurent Pinchart