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

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Date:	Wed, 30 Jan 2013 15:55:18 +0200
From:	Pantelis Antoniou <panto@...oniou-consulting.com>
To:	Mugunthan V N <mugunthanvnm@...com>
Cc:	"Bedia, Vaibhav" <vaibhav.bedia@...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 Mugunthan,

On Jan 30, 2013, at 3:53 PM, Mugunthan V N wrote:

> On 1/30/2013 7:21 PM, Pantelis Antoniou wrote:
>> 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
>> 
> This is the device ID which i have
> 
> [root@...go /]# devmem 0x44e10600
> 0x1B94402E
> 

No clue what's the difference of the black with the EVM, and why this happens.
The fix is valid anyway.

> Regards
> Mugunthan V N

Regards

-- Pantelis

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