linux-kernel - Re: [PATCH 4/5] add cursor hotspot to drm

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Message-ID: <1464700153.5978.107.camel@redhat.com>
Date:	Tue, 31 May 2016 15:09:13 +0200
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:	dri-devel@...ts.freedesktop.org,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] add cursor hotspot to drm_framebuffer

On Di, 2016-05-31 at 15:36 +0300, Ville Syrjälä wrote:

> Why store it in the fb and not eg. the plane state?

Well, drm_plane_state is allocated by drm_atomic_helper_update_plane.

When sticking the hotspot into the the plane state we have to add hot_x
and hot_y parameters to drm_plane_funcs->update_plane() and cause quite
some churn all over the drm tree.

Or create a separate code path for cursor updates which uses a special
drm_atomic_helper_update_plane version, which doesn't look very
attractive too due to code duplication.

Sticking it into the drm_framebuffer instead looks like a reasonable
alternative.

I'm open to better suggestions.

cheers,
  Gerd