On Fri, 09 May 2014, Darren Hart <dvhart@xxxxxxxxxxxxxxx> wrote: > On 5/9/14, 5:41, "Jani Nikula" <jani.nikula@xxxxxxxxx> wrote: > >>Media force wake get hangs the machine when the system is booted without >>displays attached. The assumption is that (at least some versions of) >>the firmware has skipped some initialization in that case. >> >>Empirical evidence suggests we need to reset the media force wake >>request register in addition to the render one to avoid hangs. >> >>Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75895 >>Reported-by: Imre Deak <imre.deak@xxxxxxxxx> >>Reported-by: Darren Hart <dvhart@xxxxxxxxxxxxxxx> >>Cc: stable@xxxxxxxxxxxxxxx >>Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> > > Applied to 3.14.2 and tested on MinnowBoardMax A0 hardware (BayTrail-I, > Atom E3825). > > * With no display connected, the boot no longer hangs and DRM prints > sensible messages during boot: > [ 5.968837] [drm] GMBUS [i915 gmbus vga] timed out, falling back to bit > banging on pin 2 > [ 5.988037] i915 0000:00:02.0: No connectors reported connected with > modes > [ 5.995744] [drm] Cannot find any crtc or sizes - going 1024x768 > [ 6.004716] fbcon: inteldrmfb (fb0) is primary device > [ 6.013066] Console: switching to colour frame buffer device 128x48 > [ 6.034147] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device > [ 6.041168] i915 0000:00:02.0: registered panic notifier > [ 6.049820] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: > no) > [ 6.058788] acpi device:30: registered as cooling_device3 > [ 6.065111] input: Video Bus as > /devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:00/input/input4 > [ 6.075370] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on > minor 0 > > > * If a display is subsequently connected and X is restarted, it behaves as > expected. > > * Booting with a display connected continue to work as expected. > > Tested-by: Darren Hart <dvhart@xxxxxxxxxxxxxxx> > > Thank you very much Jani! Pushed to -fixes. Thanks for testing, Darren, and thanks for review, Mika. BR, Jani. > > -- > Darren Hart Open Source Technology Center > darren.hart@xxxxxxxxx Intel Corporation > > > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
