[Intel-gfx] [PATCH 0/2] drm: link status property and DP link training failure handling

Jani Nikula jani.nikula at intel.com
Thu Jan 19 09:18:15 UTC 2017

On Wed, 18 Jan 2017, Martin Peres <martin.peres at linux.intel.com> wrote:
> On 16/12/16 15:48, Daniel Vetter wrote:
>> On Fri, Dec 16, 2016 at 12:29:05PM +0200, Jani Nikula wrote:
>>> The two remaining patches from [1], rebased.
>>> BR,
>>> Jani.
>>> [1] http://mid.mail-archive.com/1480984058-552-1-git-send-email-manasi.d.navare@intel.com
>> Just for the record, I think the only thing missing here is the Xorg
>> review on the -modesetting patch. As soon as we have that I can vacuum
>> this up (probably best through drm-misc, but not sure).
> Hey Daniel,
> I tested again on Monday -modesetting with the patch from Jani to inject 
> faults and did manage to get both the link-status BAD and a lower 
> resolution got select dynamically when running KDE. For the latter, I 
> however needed the following patch: 
> https://patchwork.kernel.org/patch/9491869/
> Now, that being said, Jani's patch just prevents a new modeset to work, 
> it does not tear down the current mode. This may be the reason why I do 
> not manage to get a black screen after > 3 failures (and already a 
> 1024x768 resolution).
> I however need to do more testing when running without a DE (straight X 
> + twm and xterm). Indeed, when I hotplug my DP screen, it gets to the 
> native resolution automatically without me asking for it using xrandr. 
> Also, the mode that is set does not seem to go through 
> intel_dp_start_link_train (what the heck?), so I do not get any failure 
> and I cannot induce one :s

Huh, does your X + twm actually respond to hotplugs?


> Because of this, I am a little uneasy and cannot say for sure that my 
> patch for -modesetting is correct. I am hoping that Manasi will get a 
> good testing rig to validate everything from end-to-end. At the very 
> least, -modesetting seems to do a reasonable job.
> Sorry for keeping you out of the loop, but I was hoping to have a more 
> clear-cut GOOD/BAD, but I seem to be mostly at a road block. Manasi told 
> me it would help if I described it here, so here I am. I will continue 
> assisting Manasi in her validation work!
> Martin
> PS: My kernel tree is here: https://cgit.freedesktop.org/~mperes/linux
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Jani Nikula, Intel Open Source Technology Center

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