Timur Tabi <ti...@freescale.com> wrote on 10/09/2009 17:26:29:
>
> Joakim Tjernlund wrote:
>
> > Looking a bit harder at the table I don't understand some entries, where
> > does
> > the entries with dfsr != 1 come from? They don't look like any table in
> > AN2919
>
> They're all calculated. I entered the algorithm into a spreadsheet and
> determined every possible combination of DFSR and FDR. The values of DFSR==22
> are for frequencies that are normally not published.
This calculation does not seem to match AN2919.
Suppose one used only Table 7(almost what we have if you exclude dfsr!= 1)
Table 7 is valid for 1 <= dfsr <=5 so how about replacing the current dfsr
with:
#ifdef __PPC__
u8 dfsr;
dfsr = (5*(i2c_clk/1000))/(100000);
if (dfsr > 5)
dfsr = 5;
if (!dfsr)
dfsr = 1;
debug("i2c_clk:%d, dfsr:%d\n", i2c_clk, dfsr);
writeb(dfsr, &dev->dfsrr); /* set default filter */
#endif
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