[ALSA] usb-audio - Fix the minimum period size per transfer mode

The minimal period size is 125us for high-speed mode while
1ms for full-speed mode.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 3 insertions, 1 deletions

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index b6d886373bb0..78efcffce8d1 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -1879,7 +1879,9 @@ static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substre
 
         /* set the period time minimum 1ms */
         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
-                                     1000 * MIN_PACKS_URB,
+                                     snd_usb_get_speed(subs->dev) == USB_SPEED_FULL ?
+                                     
+                                     1000 * MIN_PACKS_URB : 125 * MIN_PACKS_URB,
                                      /*(nrpacks * MAX_URBS) * 1000*/ UINT_MAX);
 
         if (check_hw_params_convention(subs)) {