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ALSA: hda - Do not wrongly restrict min_channels based on ELD 

Commit bbbe33900d added functionality to restrict PCM parameters
based on ELD info (derived from EDID data) of the audio sink.

However, it wrongly assumes that the bits 0-2 of the first byte of
CEA Short Audio Descriptors mean a supported number of channels. In
reality, they mean the maximum number of channels (as per CEA-861-D
7.5.2). This means that the channel count can only be used to restrict
max_channels, not min_channels.

Restricting min_channels causes us to deny opening the device in stereo
mode if the sink only has SADs that declare larger numbers of channels
(like Primare SP32 AV Processor does).

Fix that by not restricting min_channels based on ELD information.

Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
Reported-by: Jean-Yves Avenard <jyavenard@gmail.com>
Tested-by: Jean-Yves Avenard <jyavenard@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Anssi Hannula 2010-12-07 18:41:35 +02:00 committed by Takashi Iwai
parent dd5a089edf
commit 4b0dbdb17f
2 changed files with 0 additions and 5 deletions
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4
sound/pci/hda/hda_eld.c
View File

@ -601,13 +601,10 @@ void hdmi_eld_update_pcm_info(struct hdmi_eld *eld, struct hda_pcm_stream *pcm,
pcm->rates = 0;
pcm->formats = 0;
pcm->maxbps = 0;
pcm->channels_min = -1;
pcm->channels_max = 0;
for (i = 0; i < eld->sad_count; i++) {
struct cea_sad *a = &eld->sad[i];
pcm->rates |= a->rates;
if (a->channels < pcm->channels_min)
pcm->channels_min = a->channels;
if (a->channels > pcm->channels_max)
pcm->channels_max = a->channels;
if (a->format == AUDIO_CODING_TYPE_LPCM) {
@ -635,7 +632,6 @@ void hdmi_eld_update_pcm_info(struct hdmi_eld *eld, struct hda_pcm_stream *pcm,
/* restrict the parameters by the values the codec provides */
pcm->rates &= codec_pars->rates;
pcm->formats &= codec_pars->formats;
pcm->channels_min = max(pcm->channels_min, codec_pars->channels_min);
pcm->channels_max = min(pcm->channels_max, codec_pars->channels_max);
pcm->maxbps = min(pcm->maxbps, codec_pars->maxbps);
}

1
sound/pci/hda/patch_hdmi.c
View File

@ -834,7 +834,6 @@ static int hdmi_pcm_open(struct hda_pcm_stream *hinfo,
return -ENODEV;
} else {
/* fallback to the codec default */
hinfo->channels_min = codec_pars->channels_min;
hinfo->channels_max = codec_pars->channels_max;
hinfo->rates = codec_pars->rates;
hinfo->formats = codec_pars->formats;