From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pavel Roskin <proski@gnu.org>
Date: Tue, 02 Mar 2010 23:33:39 -0500
Subject: [ath9k-devel] trouble with DWA-552 and ath9k
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To: ath9k-devel@lists.ath9k.org

On Mon, 2010-03-01 at 19:55 -0500, Brian Walker wrote:

> Just used setpci -v -d *:* latency_timer=b0 to set the latency of all 
> devices to 176, did a modprobe ath9k and an ifconfig wlan0 up. System 
> didn't crash, but still getting:
> 
> ath: Failed to stop TX DMA in 100 msec after killing last frame
> ath: Unable to stop TxDMA. Reset HAL!
> ath: timeout (100000 us) on reg 0x7000: 0xffffffff & 0x00000003 != 
> 0x00000000

I'm afraid the only sure way to set PCI latency is from BIOS.

-- 
Regards,
Pavel Roskin