[Bug 89008] [BYT] No HDMI hotplugging

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89008

Egbert Eich <eich at pdx.freedesktop.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |eich at pdx.freedesktop.org,
                   |                            |imre.deak at intel.com,
                   |                            |ville.syrjala at linux.intel.c
                   |                            |om

--- Comment #9 from Egbert Eich <eich at pdx.freedesktop.org> ---
(In reply to Jani Nikula from comment #8)
> Ville on #intel-gfx:
> 
>  22:40        vsyrjala   j4ni: hotplug needs disp2d well on byt. if there
> are 
>                          no active display we turn off the power well. also 
>                          most display regs are in the power well which
> explains 
>                          the 0xffffffff

Indeed, I was able to bisect this back to commit
77961eb984c7e5394bd29cc7be2ab0bf0cc7e7b1.

This begs the question if the disp2d power wells need to be disabled quite as
aggressively: maybe there is only a subset needed for hotplug which can stay
enabled.
The same is true for the display interrupts: HPD may be one of them.

I do understand that it is important to power down the chip as much as possible
whenever feasable for ultra mobile use cases. However a lot of Baytrail chips
are used in TCs or other desktop like devices which are connected to the mains
- at least my system with 8086:0f31 is.

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