[Bug 97390] [Braswell] HDMI output not working on Insyde laptop board

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97390

Anisse Astier <anisse at astier.eu> changed:

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 Attachment #125868|0                           |1
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--- Comment #3 from Anisse Astier <anisse at astier.eu> ---
Created attachment 126098
  --> https://bugs.freedesktop.org/attachment.cgi?id=126098&action=edit
Patch to make the HDMI output work

With the attached patch the HDMI output now works.

So on this Insyde board, the HDMI is on PORTC, but the i2c uses gmbus
pin 5, which should be for PORTB. Which is why we can get the EDID if we
force-enable PORTB, but not the output.

With this patch PORTC will use gmbus pin 5, allowing the driver to get
the EDID. It's obviously just a hack/PoC.

Skylake has some information in the VBT to provide an alternate ddc pin,
but I don't know if Braswell/Cherryview has the same information. To be
continued...

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