[Bug 100047] [IGT] [SKL/GLK/APL/BSW/IVB/KBL/HSW /BYT] kms_sysfs_edid_timing test assertion failure

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100047

--- Comment #19 from Clinton Taylor <clinton.a.taylor at intel.com> ---
Theoretical maximum speed of an HDMI 2 block edid read is about 40ms. The
current WARNING threshold of 10ms per probe is absolutely incorrect since the
tool doesn't separate disconnected connectors from ones that actually have
EDID. 

The 50ms Max Threshold as stated in the tests is really close to the required
per connector of an HDMI 2 block EDID read. Any large excursions like the
original bug post of 267ms should actually be flagged as a failure. 

I plan on submitting a patch for 95ms which is a little (~10%) above the
maximum measured on SKL for a 4 block EDID read using LSPCON. This should be a
valid margin of error.

Measured on a scope and my SKL NUC using LSPCON HDMI port:

DVI EDID 1 block 21.5ms tool reports 27.25 max

HDMI EDID 2 block 41ms tool reports 46.85 max

HDMI EDID 4 Block 82ms tools reports 87.69 max

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