[Intel-gfx] [PATCH] drm/i915/vlv: reset VLV media force wake request register
Darren Hart
dvhart at linux.intel.com
Fri May 9 20:09:58 CEST 2014
On 5/9/14, 5:41, "Jani Nikula" <jani.nikula at intel.com> 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 at intel.com>
>Reported-by: Darren Hart <dvhart at linux.intel.com>
>Cc: stable at vger.kernel.org
>Signed-off-by: Jani Nikula <jani.nikula at intel.com>
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 at linux.intel.com>
Thank you very much Jani!
--
Darren Hart Open Source Technology Center
darren.hart at intel.com Intel Corporation
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