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ALSA: hda - Always allow basic audio irrespective of ELD info 

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

However, according to CEA-861-D no SAD is needed for basic audio
(32/44.1/48kHz stereo 16-bit audio), which is instead indicated with a
basic audio flag in the CEA EDID Extension.

The flag is not present in ELD. However, as all audio capable sinks are
required to support basic audio, we can assume it to be always
available.

Fix allowed audio formats with sinks that have SADs (Short Audio
Descriptors) which do not completely overlap with the basic audio
formats (there are no reports of affected devices so far) by always
assuming that basic audio is supported.

Reported-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
Cc: stable@kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Anssi Hannula 2010-12-07 20:56:19 +02:00 committed by Takashi Iwai
parent 4b0dbdb17f
commit 3dc8642903
1 changed files with 7 additions and 9 deletions
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16
sound/pci/hda/hda_eld.c
View File

@ -598,21 +598,19 @@ void hdmi_eld_update_pcm_info(struct hdmi_eld *eld, struct hda_pcm_stream *pcm,
{
int i;
pcm->rates = 0;
pcm->formats = 0;
pcm->maxbps = 0;
pcm->channels_max = 0;
/* assume basic audio support (the basic audio flag is not in ELD;
* however, all audio capable sinks are required to support basic
* audio) */
pcm->rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000;
pcm->formats = SNDRV_PCM_FMTBIT_S16_LE;
pcm->maxbps = 16;
pcm->channels_max = 2;
for (i = 0; i < eld->sad_count; i++) {
struct cea_sad *a = &eld->sad[i];
pcm->rates |= a->rates;
if (a->channels > pcm->channels_max)
pcm->channels_max = a->channels;
if (a->format == AUDIO_CODING_TYPE_LPCM) {
if (a->sample_bits & AC_SUPPCM_BITS_16) {
pcm->formats |= SNDRV_PCM_FMTBIT_S16_LE;
if (pcm->maxbps < 16)
pcm->maxbps = 16;
}
if (a->sample_bits & AC_SUPPCM_BITS_20) {
pcm->formats |= SNDRV_PCM_FMTBIT_S32_LE;
if (pcm->maxbps < 20)