From: Anssi Hannula <anssi.hannula@iki.fi>
Date: Tue, 7 Dec 2010 16:41:35 +0000 (+0200)
Subject: ALSA: hda - Do not wrongly restrict min_channels based on ELD
X-Git-Tag: v2.6.36.3~147
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3b632852ce576c23709add22e753c849a786b0ed;p=karo-tx-linux.git

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

commit 4b0dbdb17f846a8887e5f7fbeea2deb0703236bd upstream.

Commit bbbe33900d1f3c 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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/sound/pci/hda/hda_eld.c b/sound/pci/hda/hda_eld.c
index 26c3ade73583..1c849902d7af 100644
--- a/sound/pci/hda/hda_eld.c
+++ b/sound/pci/hda/hda_eld.c
@@ -607,13 +607,10 @@ 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) {
@@ -641,7 +638,6 @@ 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);
 }
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index afd6022a96a7..4ab7c5c80838 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -779,7 +779,6 @@ 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;