From: Darren Hart <dvhart@linux.intel.com>
To: Jani Nikula <jani.nikula@intel.com>,
intel-gfx@lists.freedesktop.org, Imre Deak <imre.deak@intel.com>
Subject: Re: [PATCH] drm/i915/vlv: reset VLV media force wake request register
Date: Fri, 09 May 2014 11:09:58 -0700 [thread overview]
Message-ID: <CF926724.8E6CE%dvhart@linux.intel.com> (raw)
In-Reply-To: <1399639278-30941-1-git-send-email-jani.nikula@intel.com>
On 5/9/14, 5:41, "Jani Nikula" <jani.nikula@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@intel.com>
>Reported-by: Darren Hart <dvhart@linux.intel.com>
>Cc: stable@vger.kernel.org
>Signed-off-by: Jani Nikula <jani.nikula@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@linux.intel.com>
Thank you very much Jani!
--
Darren Hart Open Source Technology Center
darren.hart@intel.com Intel Corporation
next prev parent reply other threads:[~2014-05-09 18:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-09 12:41 [PATCH] drm/i915/vlv: reset VLV media force wake request register Jani Nikula
2014-05-09 13:34 ` Mika Kuoppala
2014-05-09 18:09 ` Darren Hart [this message]
2014-05-09 18:54 ` Jani Nikula
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CF926724.8E6CE%dvhart@linux.intel.com \
--to=dvhart@linux.intel.com \
--cc=imre.deak@intel.com \
--cc=intel-gfx@lists.freedesktop.org \
--cc=jani.nikula@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox