On Tue, Jan 28, 2014 at 09:57:57AM +0200, Jani Nikula wrote: > On Thu, 19 Dec 2013, Paulo Zanoni <przanoni@xxxxxxxxx> wrote: > > From: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx> > > > > Because we already do the wait in software: see > > ironlake_wait_backlight_on and ironlake_edp_wait_backlight_off. > > > > For the "backlight on" delay, even BSpec says we need to program 0x1 > > to PP_ON_DELAYS 12:0. > > > > For the "backlight off" delay, if we don't do the same thing, when we > > call ironlake_wait_panel_off we'll end up waiting for the it again. > > > > On my machine the off delay is 200ms, so we save this amount of time > > whenever we disable the panel (e.g, suspend). > > Whoa. This appears to fix an eDP black screen with 24->18 bpp dithering: > > https://bugs.freedesktop.org/show_bug.cgi?id=73567#c21 I dunno whether I should cry or laugh ... Problem is that I don't really see a way to port just this patch to 3.14. So we need the entire series, which is a bit much imo. At least until we have more users scaling our walls. -Daniel -- 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
