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[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>
This commit is contained in:
Takashi Iwai 2007-05-02 12:09:48 +02:00 committed by Jaroslav Kysela
parent 27fe0f4b98
commit 6b9fa70a73
1 changed files with 3 additions and 1 deletions
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4
sound/usb/usbaudio.c
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@ -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)) {