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| author | Wan ZongShun <mcuos.com@gmail.com> | 2010-06-02 14:02:33 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-06-02 11:47:06 +0100 |
| commit | 8dfb0c78157e14387f49fa7ab425e65a93b2fee2 (patch) | |
| tree | 939e5783b304ae5b9489783e23ba33bc05a8bd3c /sound/soc/nuc900 | |
| parent | 018334c045c95793ab58948fe1f63282459c4f8d (diff) | |
| download | linux-8dfb0c78157e14387f49fa7ab425e65a93b2fee2.tar.gz linux-8dfb0c78157e14387f49fa7ab425e65a93b2fee2.tar.bz2 linux-8dfb0c78157e14387f49fa7ab425e65a93b2fee2.zip | |
ASoC: nuc900: fix a wait loop bug
The current implement meant ACTL_ACCON was only accessed once when read or write
proceeding, which is not right, if so,we have to wait the 'timeout=0x10000' to end
every times.
We need to polling the bit AC_R_FINISH and AC_W_FINISH of ACTL_ACCON
register to identify whether read or write is finished or not,so I make
the patch to fix the issue.
Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc/nuc900')
| -rw-r--r-- | sound/soc/nuc900/nuc900-ac97.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/sound/soc/nuc900/nuc900-ac97.c b/sound/soc/nuc900/nuc900-ac97.c index e1634a2f1701..c49a7934a7b2 100644 --- a/sound/soc/nuc900/nuc900-ac97.c +++ b/sound/soc/nuc900/nuc900-ac97.c @@ -66,9 +66,8 @@ static unsigned short nuc900_ac97_read(struct snd_ac97 *ac97, udelay(100); /* polling the AC_R_FINISH */ - val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); - val &= AC_R_FINISH; - while (!val && timeout--) + while (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_R_FINISH) + && timeout--) mdelay(1); if (!timeout) { @@ -121,9 +120,8 @@ static void nuc900_ac97_write(struct snd_ac97 *ac97, unsigned short reg, udelay(100); /* polling the AC_W_FINISH */ - tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); - tmp &= AC_W_FINISH; - while (tmp && timeout--) + while ((AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_W_FINISH) + && timeout--) mdelay(1); if (!timeout) |