From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu, 26 Mar 2015 21:18:40 +0000 (+0100)
Subject: drm/atomic-helpers: Properly avoid full modeset dance
X-Git-Tag: omap-for-v4.2/o2_dc~72^2~19^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4218a32f55fc71983e4c1c6e5b98b28db8226b3b;p=pandora-kernel.git

drm/atomic-helpers: Properly avoid full modeset dance

Legacy setCrtc has a nice fastpath for just updating the frontbuffer
when the output routing doesn't change. Which I of course tried to
keep working, except that I fumbled the job: The helpers correctly
compute ->mode_changed, CRTC updates get correctly skipped but
connector functions are called unconditionally.

Fix this.

v2: For the disable sided connector->state->crtc might be NULL.
Instead look at the old_connector_state->crtc, but still use the new
crtc state for that old crtc. Reported by Thierry.

Reported-and-Tested-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk> (v1)
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk> (v1)
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
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