[U-Boot] OMAP3 i2c issues on IGEP, u-boot 2013.10

Nikita Kiryanov
2013-11-27T16:31:07Z

On 11/27/2013 06:10 PM, Thomas Petazzoni wrote:
> Dear Nikita Kiryanov,
>
> On Wed, 27 Nov 2013 17:52:31 +0200, Nikita Kiryanov wrote:
>
>> The zeroing of the cnt register also happens in other places in the
>> driver, and it is entirely possible that they should be removed for
>> OMAP3s as well.
>>
>> In my patch I removed it only for i2c_write() because the original
>> driver also zeroed the cnt register in I/O functions- except in
>> i2c_write(), and I decided to follow the original driver's lead.
>>
>> What happens if you remove all the lines that zero the cnt register?
>
> It works. I've removed all the writew(0, ...cnt register...), and then
> I've done at least 20 boots of the IGEP board, and all of them were
> successful.
>
> I've attached the ugly patch that comments out all of those cases. Of
> course, it's not a patch intended for merging, just to show which
> locations I've commented.
>
> Since I've absolutely no idea of the background for the problem, would
> you mind submitting a proper patch with a good explanation? I will be
> happy to test it, of course.

Sure. I'm about to leave office though, so I'll prepare it tomorrow.

>
> Thanks!
>
> Thomas
>

--
Regards,
Nikita.