On 16/02/17 17:16, Tony Lindgren wrote: > * Roger Quadros <rogerq@xxxxxx> [170216 05:44]: >> +Chanwoo >> >> On 15/02/17 23:36, Tony Lindgren wrote: >>> * Tony Lindgren <tony@xxxxxxxxxxx> [170215 13:01]: >>>> * Roger Quadros <rogerq@xxxxxx> [170214 01:44]: >>>>> You can enable dwc3 trace events. >>>>> >>>>> cd /sys/kernel/debug/tracing >>>>> echo 1 > events/dwc3/enable >>>>> echo 0 > events/dwc3/dwc3_readl/enable >>>>> echo 0 > events/dwc3/dwc3_writel/enable >>>>> echo 1 > free_buffer >>>>> echo 2048 > buffer_size_kb >>>> >>>> For me the issue was I had to change my sysfs scripts to start doing >>>> echo -n instead of just echo. Things are working for me now with Linux >>>> next. >>> >>> Then in host mode after connecting a device, I see the following warnings >>> with Linux next and lockdep enabled if host mode is forced with >>> dr_mode = "host": > > BTW is dr_mode = "host" still needed or is the role switching close to > working now? dual-role is still under review. https://lkml.org/lkml/2017/2/16/254 I haven't tested it on omap5-uevm. Will keep it in mind. > >>> CONFIG_DEBUG_LOCKDEP=y >>> CONFIG_DEBUG_ATOMIC_SLEEP=y >> >> Looks like extcon is calling the notifiers while atomic. (spinlocks held, IRQs disabled?) >> Does this needs to be fixed at extcon layer or dwc3-omap should >> execute the mailbox in a workqueue? > > Sounds like changing it in extcon might break unknown other drivers :) OK. -- cheers, -roger -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
