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Commit 08a0b717 authored by Wan ZongShun's avatar Wan ZongShun Committed by Mark Brown
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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: default avatarWan ZongShun <mcuos.com@gmail.com>
Acked-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 0dc3b442

sound/soc/nuc900/nuc900-ac97.c

+2 −12
Original line number Diff line number Diff line
@@ -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);