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Date: Wed, 15 Jun 2016 08:25:34 +0530
From: Rajkumar Manoharan <rmanohar@codeaurora.org>
Subject: Re: Regression in qca99x0 on x86 platform (kernel: 4.7.0-rc1-wt-ath
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To: Ben Greear <greearb@candelatech.com>
Cc: nbd@openwrt.org, ath10k@lists.infradead.org, "Manoharan,
 Rajkumar" <rmanohar@qti.qualcomm.com>, "Valo, Kalle" <kvalo@qca.qualcomm.com>, nbd@nbd.name

On 2016-06-14 19:14, Ben Greear wrote:
> On 06/13/2016 11:21 PM, Rajkumar Manoharan wrote:
>> On 2016-06-02 23:22, Ben Greear wrote:
> 
>>> At the time, I bisected to this commit as well, but I decided to just
>>> live with it
>>> since it seemed it fixed some other bug and we had a work-around.  My
>>> understanding
>>> is that without the patch above, some ARM systems failed to work.
>>> 
>> Ben,
>> 
>> I posted a fix for the freeze issue 
>> (https://patchwork.kernel.org/patch/9175029/). Can you please give a 
>> try with VT-d disabled?
>> 
>> -Rajkumar
> 
> Yes, but it might be a bit.  I just ported my patches to 4.7, and will 
> add yours
> there.  We are mainly focussed on getting a stable 4.4+ out the door
> currently though.
> 
Thanks..

> Were you able to test on the ARM platform that originally had the 
> problem that
> Felix's patch was supposed to fix?
> 
I tested this patch on ARM platform. Unfortunately I did not observe 
original dma_alloc_coherent failures. Felix replaced dma_alloc_coherent 
by kmalloc + dma_map_single. I retained the logic as it is. Thee change 
is that host memory chuck size for target is limited by 256 KiB.

-Rajkumar

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