Dear Fabio Estevam, > Hi Uwe, > > On 07/02/2013 03:11 PM, Uwe Kleine-König wrote: > > On Tue, Jul 02, 2013 at 01:01:00PM -0300, Fabio Estevam wrote: > >> According to mx23 erratum 2727: > >> > >> "2727 : I2C 9th Clock Pulse (ACK) not generated when RETAIN_CLOCK set. > >> > >> Description: > >> > >> When RETAIN_CLOCK is set, the ninth clock pulse (ACK) is not generated. > >> However, the SDA line is read at the proper timing interval. If > >> RETAIN_CLOCK is cleared, the ninth clock pulse is generated. > >> Also, the HW_I2C_VERSION register incorrectly states the version is 1.2. > >> It should be 1.3. > >> > >> Workaround: > >> HW_I2C_CTRL1[ACK_MODE] has default value of 0. It should be set to 1 to > >> enable the fix for this issue." > >> > >> It has also been noticed that mx28 needs to implement this fix in order > >> to have SMBus to work properly. > >> > >> Reported-by: Christoph Baumann <cb@xxxxxxx> > >> Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx> > > > > Did you see this making the driver handle some situations that caused > > failure before? > > No, I haven't. I saw the report from Christoph in the linux-arm-kernel > mailing list: > http://marc.info/?l=linux-arm-kernel&m=137277422127826&w=2 > > And thought it could be nice if we could get it fixed for mx23 and mx28. How/when does this error manifest on the scope/LA? Best regards, Marek Vasut -- 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
