RE: [PATCH -pm 1/2] SDRC: check for stuck DLL state machine and kick

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Hello Richard, 

On Fri, 19 Jun 2009, Woodruff, Richard wrote:

> > From: Paul Walmsley [mailto:paul@xxxxxxxxx]
> > Sent: Thursday, June 18, 2009 4:07 PM
> 
> > On Wed, 17 Jun 2009, Woodruff, Richard wrote:
> >
> > > I've only seen the condition along side of very aggressive SDRC_POWER
> > > settings.
> >
> > Could you send over the SDRC_POWER settings that cause this problem?
> 
> This is one pulled for a custom board:
> 
> # ./readmem 0x6d000070
> 0x000200AD

Thanks.

According to the 34xx TRM Table 11-178 this sets the following: (asterisks 
mark differences from the current linux-omap code base.)

  WAKEUPPROC = 0
* AUTOCOUNT = 0x200 
* SRFRONRESET = 1
  SRFRONIDLEREQ = 0
* CLKCTRL = 2
  EXTCLKDIS = 1
  PWDENA = 1
  PAGEPOLICY = 1

Looks like the significant difference is the use of CLKCTRL = 0x2 (+ 
AUTOCOUNT).  Maybe there is some SDRC bug related to CLKCTRL = 0x2 that 
causes this problem?  Perhaps the problem is partially related to PWDENA = 
1 and erratum 1.150?  Anyway, will do a test run here with this SDRC_POWER 
register value and see if the problem reproduces.


- Paul
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