On 2021-08-20 14:15:55 [+0900], Jeaho Hwang wrote: > So we protect irqs inside hw_ep_priming not to make error cases and > also add a timeout inside the hw_ep_set_halt loop for a walkaround. > The timeout patch is submitted to linux-usb. > ( https://marc.info/?l=linux-usb&m=162918269024007&w=2 ) > > We withdrew this patch since we don't know if disabling irq is the > best solution to solve the problem and udc would work fine with > hw_ep_set_halt walkaround even though hw_ep_prime fails. > But we are still trying to find out the cause of this symptom so We'd > so appreciate it if RT or USB experts share some ideas or ways to > report somewhere. Xilinx doesn't provide any support without their > official kernel :( The UDC driver sometimes drops the lock and acquires it again. On UP it would not matter but on SMP/RT the other may acquire lock and do something with the HW. One thing that you could check if there is any HW access in between which would affect the behaviour. > Thanks for the discussion Sebastian. > > Jeaho Hwang. Sebastian
