[Intel-gfx] [PATCH] Poll for HDMI disconnects.

[Stuart Abercrombie]

> My docs here say that the SDE_ISR reg contains what we want - high
> level irq bit when the hpd line is enabled. I admit, I haven't tested
> this ...

I'm looking at 2.1.1 in this
http://intellinuxgraphics.org/documentation/SNB/IHD_OS_Vol3_Part3.pdf.
 All it has relating to hotplug in SDEIIR are D, C and B versions of
this:

"The ISR is an active high level representing the DIgital Port B
hotplug line when the Digital Port B hotplug detect input is enabled.
The unmasked IIR is set on either a short or long pulse detection
status in the Digital Port Hot Plug Control Register."

The SHOTPLUG_CTL description in 2.1.6 says DP_B_HPD_Status "reflects
the hot plug detect status on the digital port B... When either a long
or short pulse is detected, one of these bits will set.  These bits
are ORed together to go in the main ISR hotplug register bit."

Based on this description, and observed behavior, it looks as if these
registers only tell you about pulses/interrupt sources, not the line
state.

Am I missing something?

Stuart