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

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Date:	Wed, 30 Jan 2013 13:47:45 +0000
From:	"Bedia, Vaibhav" <vaibhav.bedia@...com>
To:	Pantelis Antoniou <panto@...oniou-consulting.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 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?

Regards,
Vaibhav
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