ALSA: snd-atmel-ac97c: set correct size for buffer hardware parameter

This patch will set a proper maximum bytes for the buffer, which is:
channels * bytes per sample * maximum periods * maximum bytes per period.

It also sets the minimum periods to 6, a value chosen from testing, with
a minimum of 6 periods the system has good time to fill in new audio
data without skipping.

Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/atmel/ac97c.c b/sound/atmel/ac97c.c
index 4e8f66d..c9bc345 100644 (file)
--- a/sound/atmel/ac97c.c
+++ b/sound/atmel/ac97c.c
@@ -151,10 +151,10 @@ static struct snd_pcm_hardware atmel_ac97c_hw = {
        .rate_max               = 48000,
        .channels_min           = 1,
        .channels_max           = 2,
        .rate_max               = 48000,
        .channels_min           = 1,
        .channels_max           = 2,

-       .buffer_bytes_max       = 64 * 4096,
+       .buffer_bytes_max       = 2 * 2 * 64 * 2048,

        .period_bytes_min       = 4096,
        .period_bytes_max       = 4096,
        .period_bytes_min       = 4096,
        .period_bytes_max       = 4096,

-       .periods_min            = 4,
+       .periods_min            = 6,

        .periods_max            = 64,
 };
 
        .periods_max            = 64,
 };