Hi Alexandre, Am Freitag, den 19.04.2013, 13:37 +0200 schrieb Alexandre Belloni: > Hi, > > I'm having some issues with the i2c-mxs driver in 3.9. Marek already > pointed me to the patches from Lucas and that greatly improved the > situation. > > For the context, my board has three nau7802 adcs, connected to a gpio > i2c-muxer, connected to i2c1. > > Here is what I observe: > > On 3.9: > > # time cat /sys/bus/iio/devices/iio:device1/in_voltage0_raw > 2620 > real 0m 7.08s > user 0m 0.00s > sys 0m 0.02s > # time cat /sys/bus/iio/devices/iio:device1/in_voltage1_raw > 2623 > real 0m 6.07s > user 0m 0.01s > sys 0m 0.01s > # > Is this with or without my patches? Before introduction of the error handling in PIO code there were a lot of situations where the controller would signal an error, but the driver would go on as usual, so the next transaction wouldn't succeed and stop for a whole second until the timeout hits and resets the controller. Regards, Lucas -- Pengutronix e.K. | Lucas Stach | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-5076 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | -- 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
