ALSA: hda/hdmi: add keep-alive support for ADL-P and DG2

[linux-2.6-microblaze.git] / sound / pci / hda / Kconfig

diff --git a/sound/pci/hda/Kconfig b/sound/pci/hda/Kconfig
index febe1c2..9f6c99c 100644 (file)
--- a/sound/pci/hda/Kconfig
+++ b/sound/pci/hda/Kconfig
@@ -285,15 +285,16 @@ config SND_HDA_INTEL_HDMI_SILENT_STREAM
        bool "Enable Silent Stream always for HDMI"
        depends on SND_HDA_INTEL
        help
-         Intel hardware has a feature called 'silent stream', that
-         keeps external HDMI receiver's analog circuitry powered on
-         avoiding 2-3 sec silence during playback start. This mechanism
-         relies on setting channel_id as 0xf, sending info packet and
-         preventing codec D3 entry (increasing  platform static power
-         consumption when HDMI receiver is plugged-in). 2-3 sec silence
-         at the playback start is expected whenever there is format change.
-         (default is 2 channel format).
-         Say Y to enable Silent Stream feature.
+         Say Y to enable HD-Audio Keep Alive (KAE) aka Silent Stream
+         for HDMI on hardware that supports the feature.
+
+         When enabled, the HDMI/DisplayPort codec will continue to provide
+         a continuous clock and a valid but silent data stream to
+         any connected external receiver. This allows to avoid gaps
+         at start of playback. Many receivers require multiple seconds
+         to start playing audio after the clock has been stopped.
+         This feature can impact power consumption as resources
+         are kept reserved both at transmitter and receiver.
 
 endif