linux-kernel - Re: [PATCH] cpsw: Fix interrupt storm among other things

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Message-Id: <60C298DC-2DE8-4A44-B00C-E3B09ABE701E@antoniou-consulting.com>
Date:	Wed, 30 Jan 2013 15:51:30 +0200
From:	Pantelis Antoniou <panto@...oniou-consulting.com>
To:	"Bedia, Vaibhav" <vaibhav.bedia@...com>
Cc:	"N, Mugunthan V" <mugunthanvnm@...com>,
	Richard Cochran <richardcochran@...il.com>,
	"Porter, Matt" <mporter@...com>,
	"Maupin, Chase" <chase.maupin@...com>,
	"Kridner, Jason" <jdk@...com>, Tony Lindgren <tony@...mide.com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpsw: Fix interrupt storm among other things

Hi Vaibhav,

On Jan 30, 2013, at 3:47 PM, Bedia, Vaibhav wrote:

> Hi Antoniou,
> 
> On Wed, Jan 30, 2013 at 19:07:19, Pantelis Antoniou wrote:
>> Hi Vaibhav,
>> 
>> On Jan 30, 2013, at 3:29 PM, Bedia, Vaibhav wrote:
>> 
>>> On Wed, Jan 30, 2013 at 18:14:30, Pantelis Antoniou wrote:
>>>> Hi Vaibhav,
>>>> 
>>>> On Jan 30, 2013, at 2:38 PM, Bedia, Vaibhav wrote:
>>>> 
>>>>> On Wed, Jan 30, 2013 at 16:38:50, Pantelis Antoniou wrote:
>>>>> [...]
>>>>>> 
>>>>>> TBH I haven't found a simple way to print out the silicon revision number.
>>>>>> Anyone on the list know a quick and dirty method? 
>>>>>> 
>>>>> 
>>>>> You can dump the DEVICE_ID register @ 0x44e10600.
>>>>> Bits 31:28 should be 0 for PG1.0 and 1 for PG2.0.
>>>>> 
>>>> 
>>>> Thanks this works perfectly:
>>>> 
>>>> original-bone:
>>>> root@...glebone:~# devmem2 0x44e10600 w
>>>> Read at address  0x44E10600 (0xb6ff4600): 0x0B94402E
>>>> 
>>>> bone-black:
>>>> root@...glebone:~# devmem2 0x44e10600 w
>>>> Read at address  0x44E10600 (0xb6fcc600): 0x1B94402E
>>>> 
>>> 
>>> I just re-read the mail-chain and I am confused here.
>>> So the patch in question is meant for Bone-A4 which has
>>> PG1.0?
>>> 
>> 
>> It is a general bug fix. The problem was discovered only on 
>> the bone black which has PG2.0 silicon. The driver has been
>> tested and it works on the original bone with PG1.0 as well.
>> 
> 
> But Mugunthan mentioned that he doesn't see this on an EVM
> with PG2.0 silicon... is there any board dependency here?
> 

I don't know, but I doubt it. How about we wait for Mugunthan to
send us what are the DEVICE_ID contents for his board.

> Regards,
> Vaibhav

Regards

-- Pantelis

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