[PATCH 2/7] drm/i915: Fixup Oops in the pipe config computation

[Daniel Vetter <daniel.vetter@ffwll.ch>]

Yet again our current confusion between doing the modeset globally,
but only having the new parameters for one crtc at a time.

This time things blew up when restoring modes in the switchless resume
code - intel_modeset_affected_pipes figured out that pipe 2 should
be restored, but since pipe 1 was disabled there was no mode nor fb
when trying to restore the first crtc.

Hilarity ensued and broke resume on my i945gme machine since the
pipe_config_set_bpp added in

commit 4e53c2e010e531b4a014692199e978482d471c7e
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Mar 27 00:44:58 2013 +0100

    drm/i915: precompute pipe bpp before touching the hw

fell over the lack of an fb.

Fix this mess by now by justing shunting all the cool new global
modeset logic in intel_modeset_affected_pipes.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/i915/intel_display.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f60493b..58c6bb6 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7629,6 +7629,10 @@ intel_modeset_affected_pipes(struct drm_crtc *crtc, unsigned *modeset_pipes,
 	/* ... and mask these out. */
 	*modeset_pipes &= ~(*disable_pipes);
 	*prepare_pipes &= ~(*disable_pipes);
+
+	/* HACK: We don't (yet) fully support global modesets. */
+	*modeset_pipes &= 1 << intel_crtc->pipe;
+	*prepare_pipes &= 1 << intel_crtc->pipe;
 }
 
 static bool intel_crtc_in_use(struct drm_crtc *crtc)
-- 
1.7.10.4