[alsa-devel] [PATCH] aaci: ARM1176 aaci-pl041 AC97 register read timeout

[Takashi Iwai]

At Tue, 13 Oct 2009 19:28:24 +0530,
Philby John wrote:
> 
> From: Philby John <pjohn at in.mvista.com>
> Date: Tue, 13 Oct 2009 16:30:22 +0530
> Subject: [PATCH] aaci: ARM1176 aaci-pl041 AC97 register read timeout
> 
> After a reboot on an ARM1176 which amounts to a softreset, it has been
> noted that the ALSA driver does not get registered and the probe fails
> with the error "aaci-pl041 fpga:04: ac97 read back fail". In the process
> of reading from a register the SL1TxBusy bit is set indicating that the
> transceiver is busy and remains so until the default timeout occurs.
> Set the Power down register 0x26 to an arbitrary value as specified in
> the PL041 manual (page: 3-18) so that AACISL1TX/AACISL2TX registers take
> their default state.
> 
> Signed-off-by: Philby John <pjohn at in.mvista.com>

Thanks, applied now.


Takashi

> ---
>  sound/arm/aaci.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/sound/arm/aaci.c b/sound/arm/aaci.c
> index 89096e8..98b6ffe 100644
> --- a/sound/arm/aaci.c
> +++ b/sound/arm/aaci.c
> @@ -937,6 +937,7 @@ 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
>  	 */
> -- 
> 1.6.3.3.MVISTA
> 
> 
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