Daniel Vetter fba92150aa drm/i915: rip out early dp port write for gm45/ilk ... It's bogus. If I've followed the history of this piece of code correctly, i.e. the initial register write with the following vblank wait, this goes all the way back to the original enabling of DP support in commit a4fc5ed698 Author: Keith Packard <keithp@keithp.com> Date: Tue Apr 7 16:16:42 2009 -0700 drm/i915: Add Display Port support Unfortunately it seems to be nothing more than glorified duct-tape and sometimes actively harmful. Adam Jackson noticed this for CPT platforms with commit e85194641b Author: Adam Jackson <ajax@redhat.com> Date: Thu Jul 21 17:48:38 2011 -0400 drm/i915/dp: Don't turn CPT DP ports on too early Unfortunately this kept the code around for ilk and gm45. The specific failure case I'm seeing here is that after a dpms off/on cycle we have the bits from the last link training (hopefully successful link training) set in intel_dp->DP. This is requiered so that complete_link_train can enable the port with the right tuning values. Unfortunately writing these again to the disabled port at dpms on time kills the port somehow until it's disabled - dp link training fails in an endless loop without this patch on my mobile ilk and gm45. Cc: Chris Wilson <chris@chris-wilson.co.uk> Tested-by: Chris Wilson <chris@chris-wilson.co.uk> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=51493 Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>		2012-09-20 14:23:02 +02:00
..
drm	drm/i915: rip out early dp port write for gm45/ilk	2012-09-20 14:23:02 +02:00
stub	i915: select VIDEO_OUTPUT_CONTROL for ACPI_VIDEO	2011-04-13 09:10:25 +10:00
vga	vga_switcheroo: Don't require handler init callback	2012-08-17 17:34:41 -04:00
Makefile	gpu: Add Intel GMA500(Poulsbo) Stub Driver	2010-10-26 11:00:13 +10:00