drm/i915: Disable trickle feed for gen2/3

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My 830 is unhappy with trickle feed enabled. The symptom is that
the image on the screen shifts a bit to right occasionally.

The BIOS initially disables trickle feed, but it gets reset during
suspend, so we need to re-disable it ourselves. Juse disable it
always.

Also disable it for all other gen2/3 platforms since we disable it
for all more recent platforms as well (until HSW that is). At least
my 855 doesn't seem to mind us doing this. I don't have gen3
hardware to test that.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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This commit is contained in:

Ville Syrjälä 2014-08-15 01:21:54 +03:00 • committed by Daniel Vetter

parent 9d53910580

commit 1038392b4d

2 changed files with 14 additions and 0 deletions

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4

drivers/gpu/drm/i915/i915_reg.h

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10

drivers/gpu/drm/i915/intel_pm.c

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