diff options
| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-05-22 21:41:25 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-10 00:32:59 +0900 |
| commit | 2d8666ac2e380052996fe9775e311fc8312a8d1c (patch) | |
| tree | 450e3cb39c9caaf25d4d5393e3dda35ad99fc546 /drivers | |
| parent | da94f65433119e4961748c8dc6f7603a3c53232b (diff) | |
drm/i915: wait for a vblank to pass after tv detect
commit bf2125e2f7e931b50a6c76ba0435ba001409ccbf upstream.
Otherwise the hw will get confused and result in a black screen.
This regression has been most likely introduce in
commit 974b93315b2213b74a42a87e8a9d4fc8c0dbe90c
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date: Sun Sep 5 00:44:20 2010 +0100
drm/i915/tv: Poll for DAC state change
That commit replace the first msleep(20) with a busy-loop, but failed
to keep the 2nd msleep around. Later on we've replaced all these
msleep(20) by proper vblanks.
For reference also see the commit in xf86-video-intel:
commit 1142be53eb8d2ee8a9b60ace5d49f0ba27332275
Author: Jesse Barnes <jbarnes@hobbes.lan>
Date: Mon Jun 9 08:52:59 2008 -0700
Fix TV programming: add vblank wait after TV_CTL writes
Fxies FDO bug #14000; we need to wait for vblank after
writing TV_CTL or following "DPMS on" calls may not actually enable the output.
v2: As suggested by Chris Wilson, add a small comment to ensure that
no one accidentally removes this vblank wait again - there really
seems to be no sane explanation for why we need it, but it is
required.
Launchpad: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/763688
Reported-and-Tested-by: Robert Lowery <rglowery@exemail.com.au>
Cc: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_tv.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c index f57b08bd8c6..2136e6bc893 100644 --- a/drivers/gpu/drm/i915/intel_tv.c +++ b/drivers/gpu/drm/i915/intel_tv.c @@ -1301,6 +1301,11 @@ intel_tv_detect_type (struct intel_tv *intel_tv, I915_WRITE(TV_DAC, save_tv_dac & ~TVDAC_STATE_CHG_EN); I915_WRITE(TV_CTL, save_tv_ctl); + POSTING_READ(TV_CTL); + + /* For unknown reasons the hw barfs if we don't do this vblank wait. */ + intel_wait_for_vblank(intel_tv->base.base.dev, + to_intel_crtc(intel_tv->base.base.crtc)->pipe); /* Restore interrupt config */ if (connector->polled & DRM_CONNECTOR_POLL_HPD) { |