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>

diff --git a/sound/arm/aaci.c b/sound/arm/aaci.c
index 656e474..91acc9a 100644 (file)
--- 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;