Dear Ben, > > On Thu, Mar 17, 2011 at 10:13 AM, <Bastian.Ruppert@xxxxxxxxxx> wrote: > > [...] > >> I wonder if there is YA hardware problem with i2c on the LogicPD > >> boards. I've noticed that when I don't have the UBI board connected > >> then I don't get the controller timeouts. > >> > > > > I have some effects here, too. > > We have a i2c repeater solded on our board (PCA9515AD). With this repeater > > > > i can reproduce the errer pretty fast. > > Without this repeater solded on, the mean time before failure is much > > higher. > > > > I can produce the error pretty fast with the ts_test tool. Without any > > userland > > tool using the touchscreen info or with the tool evtest, i can see the i2c > > > > action on the oscilloscope but it is hard to produce the error. > > What does this indicate to? > > Is it possible that userland can influence the kernel driver timing to > > promote > > the error? > > I don't think that userland can influence the kernel driver timing; > based on my understanding of the driver [1] polling occurs from the > moment the device is probe()'d. Are you modprob'ing the driver right > before ts_test? Where can I see the ts_test source? I have the driver build in. I have the ts_test source from here [2], but this [3] is a more official source. > > Best Regards, > Ben Gardiner > > [1] http://lxr.linux.no/linux+v2.6.38/drivers/input/touchscreen/tps6507x-ts.c > Cheers, Bastian. [2] https://github.com/kergoth/tslib/blob/master/tests/ts_test.c [3] http://tslib.sourcearchive.com/documentation/1.0-7build1/ts__test_8c-source.html -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
