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ALSA: hda/hdmi: Consider ELD is invalid when no SAD is present 

There's a system that reports a bogus HDMI audio interface:
$ cat eld#2.0
monitor_present         1
eld_valid               1
monitor_name
connection_type         DisplayPort
eld_version             [0x2] CEA-861D or below
edid_version            [0x3] CEA-861-B, C or D
manufacture_id          0xe430
product_id              0x690
port_id                 0x0
support_hdcp            0
support_ai              0
audio_sync_delay        0
speakers                [0xffff] FL/FR LFE FC RL/RR RC FLC/FRC RLC/RRC FLW/FRW FLH/FRH TC FCH
sad_count               0

Since playing audio is not possible without SAD, also consider ELD is
invalid for this case.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Link: https://lore.kernel.org/r/20211202073338.1384768-1-kai.heng.feng@canonical.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Kai-Heng Feng 2021-12-02 15:33:35 +08:00 committed by Takashi Iwai
parent 8e7daf318d
commit ce9778b7a0
1 changed files with 1 additions and 1 deletions
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2
sound/pci/hda/patch_hdmi.c
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@ -1535,7 +1535,7 @@ static void update_eld(struct hda_codec *codec,
}
}
if (!eld->eld_valid || eld->eld_size <= 0) {
if (!eld->eld_valid || eld->eld_size <= 0 || eld->info.sad_count <= 0) {
eld->eld_valid = false;
eld->eld_size = 0;
}