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ALSA: hda/hdmi: add keep-alive support for ADL-P and DG2
Implement HDA keep alive (KAE) support for Intel display codecs. When no audio stream is active, the display codec will provide a continuous clock and a valid but silent audio stream to any connected HDMI/DP receiver. Without this, upon starting a new playback stream, initial samples may be lost as many receivers require time to initialize for new clock. This is a new feature in Intel AlderLake-P display codec implementation and replaces the Intel i915 silent-stream extension that has been used on older hardware. Main benefit of the new method is that codec no longer needs to be kept in D0 power state. This patch depends on commit 112a87c ("drm/i915/display: program audio CDCLK-TS for keepalives"). [ a minor coding-style fix by tiwai ] Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Jyri Sarha <jyri.sarha@intel.com> Link: https://lore.kernel.org/r/20220216172405.3994959-1-kai.vehmanen@linux.intel.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
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