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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BAT][SKL] *ERROR* failed to enable link training"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101144#c31">Comment # 31</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [BAT][SKL] *ERROR* failed to enable link training"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101144">bug 101144</a>
from <span class="vcard"><a class="email" href="mailto:manasi.d.navare@intel.com" title="Manasi <manasi.d.navare@intel.com>"> <span class="fn">Manasi</span></a>
</span></b>
<pre>(In reply to Ville Syrjala from <a href="show_bug.cgi?id=101144#c16">comment #16</a>)
<span class="quote">> One peculiar thing see in some of the logs at least is a double long HPD
> when we turn on the panel. I wonder if there's some kind of transient glitch
> on the VDD line or something that causes to panel to do some kind of
> off->on->off->on transition.
>
> To get some more debug information maybe someone could hack up a test patch
> that checks the state of the HPD pin in a few places during the modeset; Eg.
> just after the panel supposedly powered on and just before starting link
> training, and maybe in a few places in between.
>
> What kind of machine is this? I'm wondering of the panel power delays might
> be off somehow, eg. the power cycle delay might be too short and the panel
> doesn't like it if we power it back up too soon...</span >
Hi Ville,
I want to add the check for HPD live status after the intel_edp_panel_on() call
in intel_ddi_pre_enable_dp() and right before intel_dp_start_link_train().
I am looking at the register PORT_HOTPLUG_STAT in the bspec that gives the live
status. But it does not have a bit for Port A, how do I check the live status
for Port A?</pre>
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