i2c 2 issues on omap3430

i2c 2 issues on omap3430

[naveen krishna ch]

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Hi,
    I am facing some i2c issues on omap3430 with linux 2.6.24 kernel.

    My device is a slave sitting on I2C2 of OMAP3430.

    I am observing the following,
     1) Sometimes i get "i2c_omap.2: controller timed out"

                   i2c_omap.2: No acknowledmentif i use i2c 2 at 100khz
        and i dont find them when i run at 400khz.

     2) Sometimes the i2c write and read succeeds but data received is junk.

     3) The I2C reads are not consistent. with same image if i boot
several times

        The readed values keep variying.

      I am not sure what could be the problem. The mux settings seems okay.

     The client creation seems fine. Can any one suggest me the exact
     i2c bus registration steps. right now i only have


omap_register_i2c_bus(1, CONFIG_I2C_OMAP34XX_HS_BUS1, NULL, 0);

in the board file. and

MUX configurations in the

arch/arm/plat-omap/i2c.c
arch/arm/mach-omap2/mux.c
include/asm/arch/mux.h

files

     Am i missing something?

     Please advice,


-- 
Thanks,
(: Naveen Krishna Ch :)

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Re: [i2c] i2c 2 issues on omap3430

[Felipe Balbi]

Hi,

On Mon, Aug 25, 2008 at 10:18 AM, naveen krishna ch
<naveenkrishna.ch@gmail.com> wrote:
>
>
> Hi,
>     I am facing some i2c issues on omap3430 with linux 2.6.24 kernel.
>
>     My device is a slave sitting on I2C2 of OMAP3430.
>
>     I am observing the following,
>
>      1) Sometimes i get "i2c_omap.2: controller timed out"
>
>                    i2c_omap.2: No acknowledmentif i use i2c 2 at 100khz
>         and i dont find them when i run at 400khz.
>
>      2) Sometimes the i2c write and read succeeds but data received is junk.
>
>      3) The I2C reads are not consistent. with same image if i boot several
> times

I think most of this (if not all of them) are fixed in current
linux-omap git tree.
Could you try that out and report if the same error appears on linux-omap
HEAD ?

Care to keep linux-omap@vger.kernel.org on the loop

>
>
>         The readed values keep variying.
>
>       I am not sure what could be the problem. The mux settings seems okay.
>
>      The client creation seems fine. Can any one suggest me the exact
>      i2c bus registration steps. right now i only have
>
>
>
> omap_register_i2c_bus(1, CONFIG_I2C_OMAP34XX_HS_BUS1, NULL, 0);
>
> in the board file. and
>
> MUX configurations in the
>
> arch/arm/plat-omap/i2c.c
> arch/arm/mach-omap2/mux.c
> include/asm/arch/mux.h
>
>
>
> files
>
>      Am i missing something?
>
>      Please advice,




-- 
Best Regards,

Felipe Balbi
felipebalbi@users.sourceforge.net

Re: i2c 2 issues on omap3430

[Nishanth Menon]

Hi Naveen,

naveen krishna ch said the following on 08/25/2008 02:18 AM:
>     My device is a slave sitting on I2C2 of OMAP3430.
>
>     I am observing the following,
>
>      1) Sometimes i get "i2c_omap.2: controller timed out" 
>
>                    i2c_omap.2: No acknowledmentif i use i2c 2 at 100khz
>         and i dont find them when i run at 400khz.
>   
Please see the discussion here:
http://groups.google.com/group/beagleboard/browse_thread/thread/ff79a14907cc8805/2dc9d0e5f08c9247?#2dc9d0e5f08c9247

You could also discuss this on linux-omap on vger mailing list.

Regards,
Nishanth Menon

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Re: i2c 2 issues on omap3430

[naveen krishna ch]

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>
> Hi,

         I am working on a touch pad driver which uses i2c reads and writes
to the touch pad registers. But, i observe the i2c reads are not consistent.
when i try to read the Manufacturer information i get some junk values. when
i try resetting all the register and read those values i get some other
unexpected values.

I feel like its a serious OMAP3 I2C-2 timing issue.

         But with same uImage some times i get correct values.

Do any one know what i am missing on. and how to debug this issue.


Thankfull for your suggestions.

>
>


(: Naveen Krishna Ch :)

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Re: i2c 2 issues on omap3430

[Nishanth Menon]

Naveen,
On Mon, Aug 25, 2008 at 8:09 AM, naveen krishna ch
<naveenkrishna.ch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> Do any one know what i am missing on. and how to debug this issue.
please see response from Felipe here:
http://www.mail-archive.com/linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org/msg03383.html
Regards,
Nishanth Menon

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