ALSA: atmel/ac97c: using software reset instead hardware reset if not available

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/atmel/ac97c.c b/sound/atmel/ac97c.c
index 6e5adde..73516f6 100644
--- a/sound/atmel/ac97c.c
+++ b/sound/atmel/ac97c.c
@@ -899,6 +899,10 @@
 		/* AC97 v2.2 specifications says minimum 1 us. */
 		udelay(2);
 		gpio_set_value(chip->reset_pin, 1);
+	} else {
+		ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA);
+		udelay(2);
+		ac97c_writel(chip, MR, AC97C_MR_ENA);
 	}
 }