[Bug 70511] t440p haswell hdmi no sound

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=70511

--- Comment #15 from Mengdong Lin <mengdong.lin at intel.com> ---
Hi Jani,

I feel the the DDI mode for pipe B in the audio dump is abnormal. Could you
help to clarify why gfx driver configure its mode to "HDMI mode", not "DP SST
mode"?

Pipe B DDI Function Control
PIPE DDI Function Enable                [0x1]
PIPE DDI selection                    [0x1] Digital Port B
PIPE DDI Mode                         [0x0] HDMI mode
BITS per color                        [0x0]

Martin's machine use pipe B for port B (mini-DP). 
Although he uses Mini-DP / HDMI converter on port B, I think for Haswell
display HW or gfx driver, the pipe should still be configured in DP mode. Is my
understanding right?

The audio enabling code in i915 driver depends on the mode to program N value
for DP or HDMI output.

Thanks
Mengdong

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