Hi Greg, Sure just sent the new patch v3. Patch applies cleanly on my end. So wondering what I am missing. Just in case if you are still noticing merge conflicts. Here is the git log of my local tree: 633198cd2945b7 (HEAD -> usb-next-1) usb: typec: tcpm: Migrate workqueue to RT priority for processing events fa56dd9152ef95 (origin/usb-next) Merge tag 'usb-serial-5.9-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial into usb-next 25252919a1050e xhci: dbgtty: Make some functions static b0e02550346e67 xhci: dbc: Make function xhci_dbc_ring_alloc() static ca6377900974c3 Revert "usb: dwc2: override PHY input signals with usb role switch support" 09df709cb5aeb2 Revert "usb: dwc2: don't use ID/Vbus detection if usb-role-switch on STM32MP15 SoCs" 17a82716587e9d USB: iowarrior: fix up report size handling for some devices e98ba8cc3f8a89 Merge tag 'usb-for-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next c97793089b11f7 Merge 5.8-rc7 into usb-next 92ed301919932f (tag: v5.8-rc7, origin/usb-linus, origin/main) Linux 5.8-rc7 Was comparing against https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git/log/?h=usb-next Thanks, Badhri On Wed, Jul 29, 2020 at 7:53 AM Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > On Thu, Jul 23, 2020 at 07:05:51PM -0700, Badhri Jagan Sridharan wrote: > > "tReceiverResponse 15 ms Section 6.6.2 > > The receiver of a Message requiring a response Shall respond > > within tReceiverResponse in order to ensure that the > > sender’s SenderResponseTimer does not expire." > > > > When the cpu complex is busy running other lower priority > > work items, TCPM's work queue sometimes does not get scheduled > > on time to meet the above requirement from the spec. > > Moving to kthread_work apis to run with real time priority. > > Just lower than the default threaded irq priority, > > MAX_USER_RT_PRIO/2 + 1. (Higher number implies lower priority). > > > > Further, as observed in 1ff688209e2e, moving to hrtimers to > > overcome scheduling latency while scheduling the delayed work. > > > > TCPM has three work streams: > > 1. tcpm_state_machine > > 2. vdm_state_machine > > 3. event_work > > > > tcpm_state_machine and vdm_state_machine both schedule work in > > future i.e. delayed. Hence each of them have a corresponding > > hrtimer, tcpm_state_machine_timer & vdm_state_machine_timer. > > > > When work is queued right away kthread_queue_work is used. > > Else, the relevant timer is programmed and made to queue > > the kthread_work upon timer expiry. > > > > kthread_create_worker only creates one kthread worker thread, > > hence single threadedness of workqueue is retained. > > > > Signed-off-by: Badhri Jagan Sridharan <badhri@xxxxxxxxxx> > > This doesn't apply against my usb-next branch at all. > > Can you rebase and resend? > > Remember to collect the reviewed-by tags as well when you do so. > > thanks, > > greg k-h
