linux-kernel - Re: ath9k ARM build error with v3.13-8330-g4ba9920

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Date:	Mon, 27 Jan 2014 10:10:25 -0500
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Sujith Manoharan <sujith@...jith.org>
Cc:	"John W. Linville" <linville@...driver.com>,
	ath9k-devel@...ema.h4ckr.net, netdev <netdev@...r.kernel.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: ath9k ARM build error with v3.13-8330-g4ba9920

On Sun, Jan 26, 2014 at 8:50 PM, Sujith Manoharan <sujith@...jith.org> wrote:
> Josh Boyer wrote:
>> adds a udelay(10000) call to the ath9k driver.  This will cause a
>> build error on various ARM configs because the value passed to udelay
>> is too large:
>>
>> ERROR: "__bad_udelay" [drivers/net/wireless/ath/ath9k/ath9k_hw.ko] undefined!
>> make[1]: *** [__modpost] Error 1
>> make: *** [modules] Error 2
>>
>> Is the 10000 microsecond udelay really required?  I believe the limit
>> on ARM is 2000.  Perhaps something else could be done in this case?
>
> The delay is a workaround for a HW issue. Does this patch fix the problem ?

It fixes the build error, yes.  I don't have actual HW to test, but
the driver compiles on ARM now with the same config as before.
Thanks!

josh

>
> diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
> index fbf43c0..11eab9f 100644
> --- a/drivers/net/wireless/ath/ath9k/hw.c
> +++ b/drivers/net/wireless/ath/ath9k/hw.c
> @@ -1316,7 +1316,7 @@ static bool ath9k_hw_set_reset(struct ath_hw *ah, int type)
>         if (AR_SREV_9300_20_OR_LATER(ah))
>                 udelay(50);
>         else if (AR_SREV_9100(ah))
> -               udelay(10000);
> +               mdelay(10);
>         else
>                 udelay(100);
>
> @@ -2051,9 +2051,8 @@ static bool ath9k_hw_set_power_awake(struct ath_hw *ah)
>
>         REG_SET_BIT(ah, AR_RTC_FORCE_WAKE,
>                     AR_RTC_FORCE_WAKE_EN);
> -
>         if (AR_SREV_9100(ah))
> -               udelay(10000);
> +               mdelay(10);
>         else
>                 udelay(50);
>
>
> Sujith
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