This patch has been backported to oem-6.14 by LP: #2082225. The reverted
patch didn't get backported to oem-6.14, so nothing to revert in
oem-6.14 either.
** Changed in: linux-oem-6.14 (Ubuntu)
Assignee: (unassigned) => Leo Lin (0xff07)
** Changed in: linux-oem-6.14 (Ubuntu Noble)
Assignee: (unassigned) => Leo Lin (0xff07)
** Changed in: linux-oem-6.14 (Ubuntu)
Status: New => Fix Committed
** Changed in: linux-oem-6.14 (Ubuntu Noble)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/2111875
Title:
[SRU] Fix resume issues on some PCI hotplug devices
Status in HWE Next:
New
Status in linux-oem-6.11 package in Ubuntu:
New
Status in linux-oem-6.14 package in Ubuntu:
Fix Committed
Status in linux-oem-6.11 source package in Noble:
Fix Committed
Status in linux-oem-6.14 source package in Noble:
Fix Committed
Bug description:
[ Impact ]
Since the introduction of the following patch:
UBUNTU: SAUCE: PCI: pciehp: Fix system hang during resume with
daisy-chained hotplug controllers
it has been observed that on some platforms with AMD Hawk Point
processor that the rtsx 525a SD card reader may fail to resume from
s2idle. When this happens, the kernel log will complain:
kernel: rtsx_pci 0000:02:00.0: Unable to change power state from D3hot to
D0, device inaccessible
kernel: PM: noirq resume of devices complete after 162.982 msecs
kernel: PM: early resume of devices complete after 2.181 msecs
kernel: rtsx_pci 0000:02:00.0: PM: dpm_run_callback(): pci_pm_resume
returns -110
kernel: rtsx_pci 0000:02:00.0: PM: failed to resume async: error -110
Meanwhile, another patch upstream:
e3260237aaad (PCI: pciehp: Avoid unnecessary device replacement
check)
fixed the same issue this SAUCE patch attempted to solve without this
side effect. This patch has landed in 6.15 kernel.
[ Fix ]
Revert the following patch:
UBUNTU: SAUCE: PCI: pciehp: Fix system hang during resume with
daisy-chained hotplug controllers
And replace it with:
e3260237aaad (PCI: pciehp: Avoid unnecessary device replacement
check)
[ Test ]
1. Suspend on platform with said SD card reader and resume. The rtsx_pci
suspend error message shouldn't appear
2. Perform the test described in LP: #2082225
(https://bugs.launchpad.net/bugs/2082225) on the same platform. It should pass
the test.
[ Where the problem could occur ]
This patch introduces differentiation between device replacement and
device disconnect during suspend. If for some reasons there are
devices that relies on spurious device replacement detection to
resume, then the resume may fail.
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