[PATCH 13/13] drm: bridge/dw_hdmi-ahb-audio: parse ELD from HDMI driver

Mark Brown broonie at kernel.org
Wed May 27 04:43:33 PDT 2015

On Wed, May 27, 2015 at 12:43:08PM +0200, Daniel Vetter wrote:

> Just curious questions really, I probably don't understand what's exactly
> going on. But I do think that we need a more formal way for drm/snd to
> talk to each another (i915 is growing quite a few hairy things in that
> area outside of eld atm). Problems we have are around shared power wells

Yes, I agree strongly with this - I've been asking for a while for more
code sharing and common code in this path, the helpers in here are
really good from that point of view and I'm very pleased we've got them

> and clocks (x86 doesn't help here without all the dt goodness). But
> there's also stuff like figuring out the right dividers for a given
> audio/video clock. eld and hotplug is still done in hw, but I've heard
> noises that we need to have a sw approach too on some platforms at least.

That seems to be the case, yes - FWIW quite a few of the embedded
systems are basically connecting a standard S/PDIF or I2S output to a
HDMI encoder chip or IP block so the audio controller knows nothing of
HDMI directly.
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