From: Takashi Iwai Date: Wed, 2 May 2007 10:09:48 +0000 (+0200) Subject: [ALSA] usb-audio - Fix the minimum period size per transfer mode X-Git-Tag: v2.6.22-rc1~22^2~18 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6b9fa70a73e8627c2823ee95e7c55d77e0716f1c;p=linux-2.6 [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 Signed-off-by: Jaroslav Kysela --- diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c index b6d886373b..78efcffce8 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)) {