Messages in this thread | | | Date | Mon, 23 Aug 2021 18:51:02 +0200 | From | Sebastian Andrzej Siewior <> | Subject | Re: [PATCH v2] usb: chipidea: local_irq_save/restore added for hw_ep_prime |
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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
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