On Mon, 25 Jan 2021, Mark Jonas wrote: > Hi, > > I also intended to send a cover-letter but it was somehow lost on the > way. Here it is: > > On an NXP i.MX6 Solo processor we are running an application which > makes use of real-time threads (SCHED_RR). In combination with a > DA9063 we experienced (rare) random shut-downs and reboots. We found > that the issue was caused by a combination of the (default) DA9063 > SMBus mode and non-atomic I2C transactions of the i.MX6 I2C driver. > Because a transaction could be idle for longer than the SMBus clock > time-out due to a real-time thread the DA9063 would time-out and > receive the second half of the transaction as an unintended message. > > The solution we are giving to review in this patch is to allow using > the I2C mode of the DA9063. We kindly ask for feedback and eventually > hope for an integration to the mainline. > > Because we are on a vendor kernel we were not able to test this patch > on the current mainline kernel. Though, we tested a (very similar) > patch on our (close to mainline) Linux 4.14 and 5.4 vendor kernels. This is the 3rd cover-letter I've received now! :) -- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog
