[Intel-gfx] [PATCH] drm/i915: re-init modeset hw state after gpu reset
chris at chris-wilson.co.uk
Tue Apr 10 16:10:23 CEST 2012
On Tue, 10 Apr 2012 15:50:11 +0200, Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
> After a gpu reset we need to re-init some of the hw state we only
> initialize when modeset is enabled, like rc6, hw contexts or render/GT
> core clock gating and workaround register settings.
> Note that this patch has a small change in the resume code:
> - rc6 on gen6+ is only restored for the modeset case (for more
> consistency with other callsites). This is no problem because recent
> kernels refuse to load drm/i915 without kms on gen6+
> - rc6/emon on ilk is only restored for the modeset case. This is no
> problem because rc6 is disabled by default on ilk, and ums on ilk
> has never really been a supported option outside of horrible rhel
> v2: Chris Wilson noticed that we not only fail to restore the clock
> gating settings after gpu reset.
> v3: Move the call to modeset_init_hw in _reset out of the
> struct_mutext protected area - other callers don't hold it, too.
> Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
I don't think it makes the locking any worse than it already is, but it
is becoming more and more suspect.
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
Chris Wilson, Intel Open Source Technology Centre
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