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

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Date:	Wed, 30 Jan 2013 15:37:19 +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 3:29 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.

> Regards,
> Vaibhav

Regards

-- Pantelis

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