commit c382a5da5cda3e0d8a8f2e8809460285d0a7c1cb
author Eliot Blennerhassett <eblennerhassett@audioscience.com> Thu Dec 22 13:38:33 2011 +1300
committer Takashi Iwai <tiwai@suse.de> Thu Dec 22 08:12:58 2011 +0100
tree fbfb3208ad1b616d9103330237117bd52c85f91e
parent 40818b6242513676c8adf30811fb7877b02005fb

ALSA: asihpi - Low latency mode stream has fixed channel count.

Unlike other streams which support 1..max channels,

Signed-off-by: Eliot Blennerhassett <eblennerhassett@audioscience.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/asihpi/asihpi.c

diff --git a/sound/pci/asihpi/asihpi.c b/sound/pci/asihpi/asihpi.c
index 1ba50e3..44e6ef3 100644
--- a/sound/pci/asihpi/asihpi.c
+++ b/sound/pci/asihpi/asihpi.c
@@ -135,6 +135,8 @@
 	u16 update_interval_frames;
 	u16 in_max_chans;
 	u16 out_max_chans;
+	u16 in_min_chans;
+	u16 out_min_chans;
 };
 
 /* Per stream data */
@@ -968,8 +970,6 @@
 }
 
 static struct snd_pcm_hardware snd_card_asihpi_playback = {
-	.channels_min = 1,
-	.channels_max = 2,
 	.buffer_bytes_max = BUFFER_BYTES_MAX,
 	.period_bytes_min = PERIOD_BYTES_MIN,
 	.period_bytes_max = BUFFER_BYTES_MAX / PERIODS_MIN,
@@ -1013,6 +1013,7 @@
 	runtime->private_free = snd_card_asihpi_runtime_free;
 
 	snd_card_asihpi_playback.channels_max = card->out_max_chans;
+	snd_card_asihpi_playback.channels_min = card->out_min_chans;
 	/*?snd_card_asihpi_playback.period_bytes_min =
 	card->out_max_chans * 4096; */
 
@@ -1150,8 +1151,6 @@
 
 
 static struct snd_pcm_hardware snd_card_asihpi_capture = {
-	.channels_min = 1,
-	.channels_max = 2,
 	.buffer_bytes_max = BUFFER_BYTES_MAX,
 	.period_bytes_min = PERIOD_BYTES_MIN,
 	.period_bytes_max = BUFFER_BYTES_MAX / PERIODS_MIN,
@@ -1193,6 +1192,7 @@
 	runtime->private_free = snd_card_asihpi_runtime_free;
 
 	snd_card_asihpi_capture.channels_max = card->in_max_chans;
+	snd_card_asihpi_capture.channels_min = card->in_min_chans;
 	snd_card_asihpi_capture_format(card, dpcm->h_stream,
 				       &snd_card_asihpi_capture);
 	snd_card_asihpi_pcm_samplerates(card,  &snd_card_asihpi_capture);
@@ -2883,6 +2883,15 @@
 		asihpi->out_max_chans = 2;
 	}
 
+	if (asihpi->out_max_chans > 2) { /* assume LL mode */
+		asihpi->out_min_chans = asihpi->out_max_chans;
+		asihpi->in_min_chans = asihpi->in_max_chans;
+		asihpi->support_grouping = 0;
+	} else {
+		asihpi->out_min_chans = 1;
+		asihpi->in_min_chans = 1;
+	}
+
 	snd_printk(KERN_INFO "has dma:%d, grouping:%d, mrx:%d\n",
 			asihpi->can_dma,
 			asihpi->support_grouping,