[PATCH] pxa2xx/cpufreq: Fix DRI computation

[Robert Jarzmik]

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.
>
> NOTE: The CPU type is checked only once, so the code is a little bit faster now.
>
> Signed-off-by: Marek Vasut <marek.vasut at gmail.com>
> ---
>  arch/arm/mach-pxa/cpufreq-pxa2xx.c |   33 +++++++++++++++++++++++++++++----
>  1 files changed, 29 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm/mach-pxa/cpufreq-pxa2xx.c b/arch/arm/mach-pxa/cpufreq-pxa2xx.c
> index 9e4d981..5373db0 100644
> --- a/arch/arm/mach-pxa/cpufreq-pxa2xx.c
> +++ b/arch/arm/mach-pxa/cpufreq-pxa2xx.c
> @@ -251,17 +251,42 @@ static void init_sdram_rows(void)
>  	if (mdcnfg & (MDCNFG_DE0 | MDCNFG_DE1))
>  		drac0 = MDCNFG_DRAC0(mdcnfg);
>  
> -	sdram_rows = 1 << (11 + max(drac0, drac2));
> +	sdram_rows = 11 + max(drac0, drac2);
I don't think that's correct.