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pxa2xx-ac97: switch AC unit to correct state before probing

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If AC97 unit is in partially enabled state, early request_irq can trigger
IRQ storm or even full hang up. Workaround this by forcibly switching ACLINK off
at the start of the probe.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Dmitry Baryshkov 2009-01-05 12:58:06 +03:00 committed by Mark Brown
parent 05d5e991a7
commit 7961233688
1 changed files with 16 additions and 9 deletions
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25
sound/arm/pxa2xx-ac97-lib.c
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@ -321,10 +321,6 @@ int __devinit pxa2xx_ac97_hw_probe(struct platform_device *dev)
{
int ret;
ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, 0, "AC97", NULL);
if (ret < 0)
goto err;
if (cpu_is_pxa25x() || cpu_is_pxa27x()) {
pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
@ -339,7 +335,7 @@ int __devinit pxa2xx_ac97_hw_probe(struct platform_device *dev)
if (IS_ERR(ac97conf_clk)) {
ret = PTR_ERR(ac97conf_clk);
ac97conf_clk = NULL;
goto err_irq;
goto err_conf;
}
}
@ -347,19 +343,30 @@ int __devinit pxa2xx_ac97_hw_probe(struct platform_device *dev)
if (IS_ERR(ac97_clk)) {
ret = PTR_ERR(ac97_clk);
ac97_clk = NULL;
goto err_irq;
goto err_clk;
}
return clk_enable(ac97_clk);
ret = clk_enable(ac97_clk);
if (ret)
goto err_clk2;
ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL);
if (ret < 0)
goto err_irq;
return 0;
err_irq:
GCR |= GCR_ACLINK_OFF;
err_clk2:
clk_put(ac97_clk);
ac97_clk = NULL;
err_clk:
if (ac97conf_clk) {
clk_put(ac97conf_clk);
ac97conf_clk = NULL;
}
free_irq(IRQ_AC97, NULL);
err:
err_conf:
return ret;
}
EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_probe);