ALSA: hda - document the ELD proc interface

Describe what ELD proc interface provides and how to fix incorrect values.

Signed-off-by: Wu Fengguang <wfg@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/Documentation/sound/alsa/Procfile.txt b/Documentation/sound/alsa/Procfile.txt
index f738b296440a55a3a3cc86b0f0039bff1c2d2067..bba2dbb79d81c10d71bbc5b0879f6d3745d1543d 100644 (file)
--- a/Documentation/sound/alsa/Procfile.txt
+++ b/Documentation/sound/alsa/Procfile.txt
@@ -153,6 +153,16 @@ card*/codec#*
        Shows the general codec information and the attribute of each
        widget node.
 
+card*/eld#*
+       Available for HDMI or DisplayPort interfaces.
+       Shows ELD(EDID Like Data) info retrieved from the attached HDMI sink,
+       and describes its audio capabilities and configurations.
+
+       Some ELD fields may be modified by doing `echo name hex_value > eld#*`.
+       Only do this if you are sure the HDMI sink provided value is wrong.
+       And if that makes your HDMI audio work, please report to us so that we
+       can fix it in future kernel releases.
+
 
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