RE: [PATCH 1/3] [OMAPZOOM] Lower i2c speed on bus 1 for LDP.

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I noticed that l-o updated divisors the other day.

It might be some sync'ing pulled in bad dividers?

Regards,
Richard W.


> -----Original Message-----
> From: linux-omap-owner@xxxxxxxxxxxxxxx [mailto:linux-omap-
> owner@xxxxxxxxxxxxxxx] On Behalf Of shekhar, chandra
> Sent: Wednesday, November 12, 2008 8:50 PM
> To: Curran, Dominic; linux-omap@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH 1/3] [OMAPZOOM] Lower i2c speed on bus 1 for LDP.
> 
> 
> ----- Original Message -----
> From: "Dominic Curran" <dcurran@xxxxxx>
> To: <linux-omap@xxxxxxxxxxxxxxx>
> Sent: Thursday, November 13, 2008 1:51 AM
> Subject: [PATCH 1/3] [OMAPZOOM] Lower i2c speed on bus 1 for LDP.
> 
> 
> > Resending patch with more descriptive comment.
> >
> > Lower i2c bus 1 speed to 400KHz for LDP.
> > At 2600KHz i2c reads from twl4030 keypad driver are returning
> > incorrect data. Reason unknown. Lowering bus speed as temporary
> > fix to get LDP keypad working.
> >
> > Signed-off-by: Dominic Curran <dcurran@xxxxxx>
> > ---
> > arch/arm/mach-omap2/board-ldp.c |    2 +-
> > 1 files changed, 1 insertions(+), 1 deletions(-)
> >
> > diff --git a/arch/arm/mach-omap2/board-ldp.c b/arch/arm/mach-
> omap2/board-ldp.c
> > index d889ce8..b2e8c9c 100755
> > --- a/arch/arm/mach-omap2/board-ldp.c
> > +++ b/arch/arm/mach-omap2/board-ldp.c
> > @@ -797,7 +797,7 @@ static struct i2c_board_info __initdata
> > ldp_i2c_boardinfo_2[] = {
> >
> > static int __init omap_i2c_init(void)
> > {
> > - omap_register_i2c_bus(1, 2600, ldp_i2c_boardinfo,
> > + omap_register_i2c_bus(1, 400, ldp_i2c_boardinfo,
> >  ARRAY_SIZE(ldp_i2c_boardinfo));
> 
> 
> Last time i checked we were getting few errors (returning incorrect
> values) even
> at 400k , and no error at 100k.
> Have you seen any at 400k?
> 
> 
> >  omap_register_i2c_bus(2, 100, ldp_i2c_boardinfo_2,
> >  ARRAY_SIZE(ldp_i2c_boardinfo_2));
> > --
> > 1.5.4.1
> >
> > --
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