path: root/sound
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authorPhilby John <pjohn@mvista.com>2010-03-26 21:37:51 +0530
committerTakashi Iwai <tiwai@suse.de>2010-04-13 09:46:55 +0200
commitb68b58fd6a341c2115ff5fb466fe9fc0b581980e (patch)
treeeaeaa1a7babed5ee4df999d99468eff79e68f2d1 /sound
parent29aac005ff4dc8a5f50b80f4e5c4f59b21c0fb50 (diff)
ALSA: aaci - Fix alignment faults on ARM Cortex introduced by commit 29a4f2d3
The commit 29a4f2d3 used writel() at offset 0x26 which is half-word aligned causing unaligned exceptions on a Cortex-A8. The original patch solved the "aaci-pl041 fpga:04: ac97 read back fail" issue on a soft reset. Reading from any arbitrary aaci register seems to solve this issue. Signed-off-by: Philby John <pjohn@mvista.com> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
1 files changed, 5 insertions, 2 deletions
diff --git a/sound/arm/aaci.c b/sound/arm/aaci.c
index 656e474dca4..91acc9a243e 100644
--- a/sound/arm/aaci.c
+++ b/sound/arm/aaci.c
@@ -863,7 +863,6 @@ static int __devinit aaci_probe_ac97(struct aaci *aaci)
struct snd_ac97 *ac97;
int ret;
- writel(0, aaci->base + AC97_POWERDOWN);
* Assert AACIRESET for 2us
@@ -1047,7 +1046,11 @@ static int __devinit aaci_probe(struct amba_device *dev, struct amba_id *id)
writel(0x1fff, aaci->base + AACI_INTCLR);
writel(aaci->maincr, aaci->base + AACI_MAINCR);
+ /*
+ * Fix: ac97 read back fail errors by reading
+ * from any arbitrary aaci register.
+ */
+ readl(aaci->base + AACI_CSCH1);
ret = aaci_probe_ac97(aaci);
if (ret)
goto out;