On Fri, 18 Nov 2011 15:27:14 -0800 Keith Packard <keithp at keithp.com> wrote: > On Fri, 18 Nov 2011 14:48:39 -0800, Jesse Barnes <jbarnes at virtuousgeek.org> wrote: > > > So the ECOBUS reg *is* in the GT power well. Which means in order to > > read it we have to disable RC6 altogether, forcibly, using the 0xa090 > > reg, set up force wake, then re-enable RC6. > > Not surprising the ECOBUS is in the well; we really only need to read it > when rc6 is getting set up, so it'll be disabled at that point. > > But, unless I'm confused, ECOBUS doesn't have any useful information in > it anyways: > > # intel_reg_read 0xa090 > 0xA090 : 0x0 > # intel_reg_read 0xa080 > 0xA080 : 0x0 > Are you using the forcewaked tool to read it? bwidawsk at seagal ~/intel-gfx/drm-intel2 (forced-throttling|REBASE-i)$ sudo ../intel-gpu-tools/tools/intel_reg_read 0xa090 0xA090 : 0x88060000
