On Fri, Mar 07, 2014 at 08:57:52AM -0800, Jesse Barnes wrote: > Some machines may have a broken VBT or no VBT at all, but we still want > to use SSC there. So check for it and keep it enabled if we see it > already on. Based on an earlier fix from Kristian. > > Reported-by: Kristian Høgsberg <hoegsberg@xxxxxxxxx> > Signed-off-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx> > --- > drivers/gpu/drm/i915/intel_display.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c > index 479de3b..d450ab6 100644 > --- a/drivers/gpu/drm/i915/intel_display.c > +++ b/drivers/gpu/drm/i915/intel_display.c > @@ -5806,6 +5806,10 @@ static void ironlake_init_pch_refclk(struct drm_device *dev) > */ > val = I915_READ(PCH_DREF_CONTROL); > > + /* Preserve SSC if the BIOS set it */ > + if (val & DREF_SSC1_ENABLE) > + i915.panel_use_ssc = 1; This definitely needs some debug output, and we need to make sure that the module option still overrides this. -Daniel > + > /* As we must carefully and slowly disable/enable each source in turn, > * compute the final state we want first and check if we need to > * make any changes at all. > -- > 1.8.4.2 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
