On 11/17/2015 03:28 PM, Shubhrajyoti Datta wrote: > On Tue, Nov 17, 2015 at 1:04 PM, Lars-Peter Clausen <l...@metafoo.de> wrote: >> On 11/17/2015 06:17 AM, Shubhrajyoti Datta wrote: >>> On Mon, Nov 16, 2015 at 7:12 PM, Lars-Peter Clausen <l...@metafoo.de> wrote: >>>> Commit d701667bb331 ("i2c: xiic: Do not reset controller before every >>>> transfer") removed the reinitialization of the controller before the start >>>> of each transfer. Apparently this change is not safe to make and the commit >>>> results in random I2C bus failures. >>> >>> Which is the platform and the ip version that you saw the issue. >>> Did you see the issue with read and write as well? >> >> The IP version is the axi-iic v2.0 Revision 8. I've tested this on a few >> platforms, custom ones and standard ones and I could reproduce it on most. >> One of them was on the ZED board. The one where I couldn't reproduce it was >> the ZC706. But that doesn't necessarily mean it doesn't happen there, just >> that it is not triggered by the testcase. > All the boards having the same version of the ip is what I have understood. > > Thanks for the info I will try to reproduce the issue. > >> >> The problem is that it is random corruption, > Of registers?
To be honest I don't know if there is corruption during I2C write transfers, but there is definitely corruption during read transactions. - Lars -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html