[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>
git-mirror · May 11, 2007 · 6b9fa70 · 6b9fa70
1 parent 27fe0f4
commit 6b9fa70
Showing 1 changed file with 3 additions and 1 deletion.
diff --git 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)) {