From: Takashi Iwai <tiwai@suse.de>
Date: Wed, 2 May 2007 10:09:48 +0000 (+0200)
Subject: [ALSA] usb-audio - Fix the minimum period size per transfer mode
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6b9fa70a73e8627c2823ee95e7c55d77e0716f1c;p=linux.git

[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>
---

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index b6d886373bb00..78efcffce8d1e 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)) {