** Changed in: linux (Ubuntu Plucky)
Assignee: Ivan Hu (ivan.hu) => En-Wei Wu (rickywu)
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https://bugs.launchpad.net/bugs/2115478
Title:
[SRU] Add waiting latency for USB port resume
Status in HWE Next:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-6.14 package in Ubuntu:
Invalid
Status in linux source package in Noble:
Won't Fix
Status in linux-oem-6.14 source package in Noble:
Fix Released
Status in linux source package in Plucky:
New
Status in linux-oem-6.14 source package in Plucky:
Invalid
Status in linux source package in Questing:
Fix Released
Status in linux-oem-6.14 source package in Questing:
Invalid
Bug description:
[ Impact ]
On certain USB3 device topologies, the hub will enter runtime resume
before the down stream device to wake up. When a device is connect to
such hub, the hub will enter runtime resume before the device
generates any activities, making it not able to get detected.
[ Fix ]
========================= OEM-6.14 =======================================
Cherry-pick the following commit:
1. [PATCH v2] usb: hub: fix detection of high tier USB3 devices behind
suspended hubs[1]
========================= Plucky ============================
Cherry-pick the following commit:
1. usb: hub: fix detection of high tier USB3 devices behind suspended
hubs[1]
and backport the subsequent two commits, which fix an issue caused by
the commit above:
2. usb: hub: Fix flushing and scheduling of delayed work that tunes runtime pm
3. usb: hub: Fix flushing of delayed work used for post resume purposes
[ Test ]
1. Connect SD25TB5/WD25TB5 dock to SUT.
2. Connect USB3.0/3.1 sotarge to dock's USB port.
3. The USB storage should be recognized.
[ Where problems could occurs ]
This may increase resume latency for deeper USB device hierarchy.
[ Additional Information ]
[1] https://lore.kernel.org/linux-
usb/[email protected]/
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