From 08a0b717578ab03db99367e69bfe6a4a71918e2c Mon Sep 17 00:00:00 2001 From: Wan ZongShun Date: Wed, 2 Jun 2010 13:57:01 +0800 Subject: [PATCH] ASoC: nuc900: patch for modifing the ac97 delays to minimum This patch is to modify the ac97 delays to minimum, all these 1000 micro seconds delays seem over spec for the AC97 interface. I deleted some unnecessary delays here and changed the AC97 cold and warm reset delays from 1000us to 100us. Signed-off-by: Wan ZongShun Acked-by: Liam Girdwood Signed-off-by: Mark Brown --- sound/soc/nuc900/nuc900-ac97.c | 14 ++------------ 1 file changed, 2 insertions(+), 12 deletions(-) diff --git a/sound/soc/nuc900/nuc900-ac97.c b/sound/soc/nuc900/nuc900-ac97.c index b6e42c7eb9a3..caa7c901bc2e 100644 --- a/sound/soc/nuc900/nuc900-ac97.c +++ b/sound/soc/nuc900/nuc900-ac97.c @@ -147,7 +147,7 @@ static void nuc900_ac97_warm_reset(struct snd_ac97 *ac97) val |= AC_W_RES; AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val); - udelay(1000); + udelay(100); val = nuc900_checkready(); if (!!val) @@ -168,40 +168,30 @@ static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97) val |= ACTL_RESET_BIT; AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); - udelay(1000); - val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); val &= (~ACTL_RESET_BIT); AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); - udelay(1000); - /* reset AC-link interface */ val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); val |= AC_RESET; AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); - udelay(1000); - val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); val &= ~AC_RESET; AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); - udelay(1000); - /* cold reset AC 97 */ val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); val |= AC_C_RES; AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val); - udelay(1000); - val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); val &= (~AC_C_RES); AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val); - udelay(1000); + udelay(100); mutex_unlock(&ac97_mutex); -- 2.20.1