CHROMIUM: video: tegra: Implement tegra_dc_hdmi_set_audio_sample_rate

CHROMIUM: video: tegra: Implement tegra_dc_hdmi_set_audio_sample_rate

The SPDIF audio driver needs to inform the HDMI driver of the currently
active audio sample rate, so that the HDMI controller can be correctly
configured for that rate. Add a function to allow this.

There is a single SPDIF controller, which is routed to both display
controllers. Hence, iterate over all HDMI controllers when implementing
this functionality.

Signed-off-by: Stephen Warren <swarren@nvidia.com>;

BUG=
TEST=

[Stephen Warren, 2011-03-04 21:27:31]

This series of patches implements audio-over-HDMI support:

http://codereview.chromium.org/6625021
http://codereview.chromium.org/6623022
http://codereview.chromium.org/6626025
http://codereview.chromium.org/6632011
http://codereview.chromium.org/6624031
http://codereview.chromium.org/6624032
http://codereview.chromium.org/6623023
http://codereview.chromium.org/6625022

The series requires two other series to be merged first:
* My series to backport upstream ASoC into ChromeOS
  (strictly necessary in all likelihood)
* Robert's series to rework the dc driver
  (perhaps not required; some small amount of merging may be required
  in order to merge this first though)

[Olof Johansson, 2011-03-07 03:41:53]

Thanks, applied.