[PATCH] drm/fb-helper: don't clobber output routing in setup_crtcs

[Daniel Vetter]

On Sun, Aug 12, 2012 at 06:15:48PM +0200, Daniel Vetter wrote:
> Yet again the too close relationship between the fb helper and the
> crtc helper code strikes. This time around the fb helper resets all
> encoder->crtc pointers to NULL before starting to set up it's own
> mode. Which is total bullocks, because this will clobber the existing
> output routing, which the new drm/i915 code depends upon to be
> absolutely correct.
> 
> The crtc helper itself doesn't really care about that, since it
> disables unused encoders in a rather roundabout way anyway.
> 
> Two places call drm_setup_crts:
> 
> - For the initial fb config. I've auditted all current drivers, and
>   they all allocate their encoders with kzalloc. So there's no need to
>   clear encoder->crtc once more.
> 
> - When processing hotplug events while showing the fb console. This
>   one is a bit more tricky, but both the crtc helper code and the new
>   drm/i915 modeset code disable encoders if their crtc is changed and
>   that encoder isn't part of the new config. Also, both disable any
>   disconnected outputs, too.
> 
>   Which only leaves encoders that are on, connected, but for some odd
>   reason the fb helper code doesn't want to use. That would be a bug
>   in the fb configuration selector, since it tries to light up as many
>   outputs as possible.
> 
> v2: Kill the now unused encoders variable.
> 
> Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
> Hi Dave,
> 
> This patch here is blocking the modeset-rework series, and I'd like to merge
> that as soon as possible. You've merged the other two prep patches already for
> 3.6, but this one here popped up later on in testing.
> 
> Can you please merge this into drm-next for 3.7 so that I can backmerge it, or
> smash your maintainer-ack onto it for merging through the intel tree?

Merged to drm-intel-next with Dave's irc-ack. Should show up in drm-next
in about 2 weeks ...
-Daniel
-- 
Daniel Vetter
Mail: daniel at ffwll.ch
Mobile: +41 (0)79 365 57 48