[PATCH] pxa2xx/cpufreq: Fix DRI computation

[Marek Vasut]

Dne Po 7. června 2010 21:41:37 Robert Jarzmik napsal(a):
> Marek Vasut <marek.vasut at gmail.com> writes:
> > The DRI field was incorrectly computed, causing various hangs and weird
> > behaviour on PXA2xx machines. This patch introduces the DRI computation
> > according to the PXA255 (January 2004) and PXA270 (MV-S301039-00 Rev. A)
> > datasheets.
> 
> Hi Marek,
> 
> I'll help a bit in the review here, but I need a few days.
> 
> Meanwhile, I began the review and I have a question : did you check
> MDCNFG_DRAC0() and MDCNFG_DRAC2() definitions ? As I check my TRM, it
> should be, according to my manual :
> + #define MDCNFG_DRAC2(mdcnfg) (((mdcnfg) >> 19) & 0x3)
> + #define MDCNFG_DRAC0(mdcnfg) (((mdcnfg) >> 3) & 0x3)
> - #define MDCNFG_DRAC2(mdcnfg) (((mdcnfg) >> 21) & 0x3)
> - #define MDCNFG_DRAC0(mdcnfg) (((mdcnfg) >> 5) & 0x3)
> 
> While I was checking the calculation, that rows calculation doesn't fit.
> Hence I wonder if init_sdram_rows() will be correct.
> I'll send a full review soon, don't be too quick with V2 please.

Robert, this is actually a good catch, I'll try with this change, maybe it'll 
stop hanging finally.

Thanks!
> 
> Cheers.
> 
> --
> Robert