Hi,
* Jean Delvare <[email protected]> [061204 09:49]:
> Hi Tony, all,
>
> On Thu, 10 Aug 2006 16:19:26 +0300, Tony Lindgren wrote:
> > * Jean Delvare <[email protected]> [060810 11:30]:
> > > I've now taken Komal's patch (#4). Here is a proposed patch which brings
> > > the prescaler computation formula in line with your comment and table
> > > above. It could be applied on top of Komal's patch unless it causes a
> > > problem on some of the OMAP systems. For XOR = 13 MHz, it changes the
> > > prescaler from 0 to 1. For XOR = 19.2 MHz it changes the prescaler from
> > > 2 to 1.
> >
> > OK cool. As far as I'm concerned, I'm fine with it too:
> > Signed-off-by: Tony Lindgren <[email protected]>
> >
> > > I don't have any hardware to test it, though. If it happens to be
> > > better to be slightly over 12 MHz than slightly below 7 MHz, the
> > > "> 12000000" condition below can be replaced with "> 14000000".
> >
> > Thanks, we'll test it on various omaps and let you know if it works.
>
> Any news on this? I still have this patch in my local tree. Should I
> push it into Linux 2.6.20?
>
> i2c: Fix OMAP clock prescaler to match the comment
>
> Signed-off-by: Tony Lindgren <[email protected]>
> Signed-off-by: Jean Delvare <[email protected]>
> ---
> drivers/i2c/busses/i2c-omap.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> --- linux-2.6.18-rc4.orig/drivers/i2c/busses/i2c-omap.c 2006-08-10 09:56:54.000000000 +0200
> +++ linux-2.6.18-rc4/drivers/i2c/busses/i2c-omap.c 2006-08-10 10:12:03.000000000 +0200
> @@ -231,8 +231,8 @@
> * 13 2 1
> * 19.2 2 1
> */
> - if (fclk_rate > 16000000)
> - psc = (fclk_rate + 8000000) / 12000000;
> + if (fclk_rate > 12000000)
> + psc = fclk_rate / 12000000;
> }
>
> /* Setup clock prescaler to obtain approx 12MHz I2C module clock: */
Sorry for the delay in replying. Yes, it's safe to push. When the original
code was done, the max limit of 12MHz was ignored.
Regards,
Tony
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