[ALSA] snd_usb_caiaq: make high sample rates work with A8DJ

This patch for snd_usb_caiaq makes sample rates higher dann 48KHz work
with devices which have more than 2 stereo input/output pairs.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 6 insertions, 2 deletions

diff --git a/sound/usb/caiaq/caiaq-audio.c b/sound/usb/caiaq/caiaq-audio.c
index ebf32818a16..24970a5c888 100644
--- a/sound/usb/caiaq/caiaq-audio.c
+++ b/sound/usb/caiaq/caiaq-audio.c
@@ -39,7 +39,8 @@
 #define BYTES_PER_SAMPLE        3
 #define BYTES_PER_SAMPLE_USB    4
 #define MAX_BUFFER_SIZE         (128*1024)
-                                 
+#define MAX_ENDPOINT_SIZE       512
+
 #define ENDPOINT_CAPTURE        2
 #define ENDPOINT_PLAYBACK       6
 
@@ -221,7 +222,10 @@ static int snd_usb_caiaq_pcm_prepare(struct snd_pcm_substream *substream)
         
         bpp = ((runtime->rate / 8000) + CLOCK_DRIFT_TOLERANCE)
                 * bytes_per_sample * CHANNELS_PER_STREAM * dev->n_streams;
-        
+
+        if (bpp > MAX_ENDPOINT_SIZE)
+                bpp = MAX_ENDPOINT_SIZE;
+
         ret = snd_usb_caiaq_set_audio_params(dev, runtime->rate,
                                              runtime->sample_bits, bpp);
         if (ret)