drm/i915/pch: Save/restore PCH_PORT_HOTPLUG across suspend

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At least on a Lenovo X220 the HPD bits of this are enabled at boot but
cleared after resume, which means plug interrupts stop working.

This also happens to fix DP displays re-lighting on resume.  I'm quite
certain that's an accident: the first DP link train inevitably fails on
that machine, and it's only serendipity that we're getting multiple plug
interrupts and the second train works.  But I shall take my victories
where I get them.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Tested-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

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Adam Jackson 2011-07-26 16:53:06 -04:00 • committed by Keith Packard

parent 291427f5fd

commit cda2bb78c2

2 changed files with 3 additions and 0 deletions

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1

drivers/gpu/drm/i915/i915_drv.h

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2

drivers/gpu/drm/i915/i915_suspend.c

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