On Sun, 14 Oct 2012 19:10:38 -0700, Jesse Barnes <jbarnes at virtuousgeek.org> wrote: > The BIOS shouldn't be touching this memory across suspend/resume, so > just leave it alone. This saves us ~50ms on resume on my T420. > > Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org> > --- > drivers/gpu/drm/i915/i915_drv.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c > index 824e3c8..95e2b8b 100644 > --- a/drivers/gpu/drm/i915/i915_drv.c > +++ b/drivers/gpu/drm/i915/i915_drv.c > @@ -119,6 +119,10 @@ module_param_named(i915_enable_ppgtt, i915_enable_ppgtt, int, 0600); > MODULE_PARM_DESC(i915_enable_ppgtt, > "Enable PPGTT (default: true)"); > > +int i915_needs_gtt_restore __read_mostly = 0; > +module_param_named(gtt_restore, i915_needs_gtt_restore, int, 0600); > +MODULE_PARM_DESC(gtt_restore, "Rewrite GTT on resume (default: false)"); Wrong way around. This code exists purely because KMS resume was broken on a number of machines without reinitialising the GTT, ergo this is a regression. -Chris -- Chris Wilson, Intel Open Source Technology Centre
