linux-kernel - Re: [4.4-rc1][Regression] drm/i915: Check live status before reading edid

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Date:	Wed, 2 Mar 2016 16:58:32 -0500
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	Jani Nikula <jani.nikula@...ux.intel.com>, sonika.jindal@...el.com
Cc:	shashank.sharma@...el.com, rodrigo.vivi@...el.com,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	David Airlie <airlied@...ux.ie>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [4.4-rc1][Regression] drm/i915: Check live status before reading
 edid

On 02/29/2016 04:33 AM, Jani Nikula wrote:
> On Wed, 24 Feb 2016, Joseph Salisbury <joseph.salisbury@...onical.com> wrote:
>> Hi Sonika,
>>
>> A kernel bug report was opened against Ubuntu [0].  After a kernel
>> bisect, it was found that reverting the following commit resolved this bug:
>>
>> commit 237ed86c693d8a8e4db476976aeb30df4deac74b
>> Author: Sonika Jindal <sonika.jindal@...el.com>
>> Date:   Tue Sep 15 09:44:20 2015 +0530
>>
>>     drm/i915: Check live status before reading edid
>>
>>
>>
>> The regression was introduced as of v4.4-rc1.
>>
>> I was hoping to get your feedback, since you are the patch author.  Do
>> think increasing the number of tries in intel_hdmi_detect() is worth
>> trying?  Do you think gathering any additional data will help diagnose
>> this issue, or would it be best to submit a revert request?
Thanks for the info.  I will have all of these commits tested.


> There are at least the following commits claiming to fix issues in the
> above commit. Please make sure you have them.
>
> BR,
> Jani.
>
>
> commit 8d409cb3e8a24196be7271defafd4638f3e0b514
> Author: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> Date:   Wed Feb 10 19:59:05 2016 +0200
>
>     drm/i915: Fix hpd live status bits for g4x
>
> commit 3d8acd1f667b45c531401c8f0c2033072e32a05d
> Author: Gary Wang <gary.c.wang@...el.com>
> Date:   Wed Dec 23 16:11:35 2015 +0800
>
>     drm/i915: increase the tries for HDMI hotplug live status checking
>
> commit 97f9010af05c15e0b7e6b4ef6ff8cb0ebb7e7715
> Author: Daniel Vetter <daniel.vetter@...ll.ch>
> Date:   Fri Dec 11 19:44:15 2015 +0100
>
>     drm/i915: mdelay(10) considered harmful
>
> commit 0f5a9be15797f78c9a34e432f26c796165b6e49a
> Author: Imre Deak <imre.deak@...el.com>
> Date:   Fri Nov 27 18:55:29 2015 +0200
>
>     drm/i915: take a power domain reference while checking the HDMI live status
>
>
>
>