Re: [PATCH 4.14 105/136] usb/ehci-platform: Set PM runtime as active on resume

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On Fri, Jul 17, 2020 at 05:17:23PM +0100, Qais Yousef wrote:
Hi Eugeniu

On 07/09/20 09:00, Eugeniu Rosca wrote:
Hello everyone,

Cc: linux-renesas-soc
Cc: linux-pm

[...]

After integrating v4.14.186 commit 5410d158ca2a50 ("usb/ehci-platform:
Set PM runtime as active on resume") into downstream v4.14.x, we started
to consistently experience below panic [1] on every second s2ram of
R-Car H3 Salvator-X Renesas reference board.

After some investigations, we concluded the following:
 - the issue does not exist in vanilla v5.8-rc4+
 - [bisecting shows that] the panic on v4.14.186 is caused by the lack
   of v5.6-rc1 commit 987351e1ea7772 ("phy: core: Add consumer device
   link support"). Getting evidence for that is easy. Reverting
   987351e1ea7772 in vanilla leads to a similar backtrace [2].

Questions:
 - Backporting 987351e1ea7772 ("phy: core: Add consumer device
   link support") to v4.14.187 looks challenging enough, so probably not
   worth it. Anybody to contradict this?
 - Assuming no plans to backport the missing mainline commit to v4.14.x,
   should the following three v4.14.186 commits be reverted on v4.14.x?
   * baef809ea497a4 ("usb/ohci-platform: Fix a warning when hibernating")
   * 9f33eff4958885 ("usb/xhci-plat: Set PM runtime as active on resume")
   * 5410d158ca2a50 ("usb/ehci-platform: Set PM runtime as active on resume")

Thanks for investigating this.

Alan, Greg, do you have any ideas?

I've reverted these 3 commits from 5.4 and earlier, thank you for
investigating this issue.

--
Thanks,
Sasha



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