Not sure why you skirt around calling the thing by its name. It's
called LPE isn't it?
No. LPE aka SST is the path to the audio dsp subsystem.
This path to HDMI has nothing to do with the audio dsp. Not a single
gate is shared.
The why are the interrupt bits called LPE_somethingsomething?
And what generates the audio data then?
I don't think the HAS ever mentioned LPE, it's really unrelated to LPE.
LPE cannot even get the interrupts or access the registers.
The audio data is generated by the application, written to a ring buffer
and fetch by the DMA before they are inserted in the audio islands
In most Android implementations this driver is probed using a dedicated
ACPI _HID different from the LPEA one. For upstream and machines that
don't have this specific device in the BIOS we may piggyback on the LPEA
device to complete the probe (that's how it's done on Windows apparently).
Hmm. So it's a third audio controller or something? Just someone named
the display related bits as LPE just to confuse people on purpose?
it's really an interface to the display controller, not a new hardware
part. Everything called LPE should be renamed to avoid this confusion.
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