Re: [PATCH RFC 2/2] usb: dwc3: rockchip: Keep the host bus across suspend-to-idle on RK3588

[sashiko-bot@kernel.org]

> From: Arun Iyengar <aiyengar1990@gmail.com>
> 
> On RK3588 nothing powers the USB3 controllers down in suspend-to-idle:
> this glue has no system sleep work of its own, the controllers are
> either in PD_USB, which has GENPD_FLAG_ACTIVE_WAKEUP and so stays on for
> a device on the awake path, or (USB3OTG2) in no power domain at all.
> Tearing the core down there only ends the power sessions of the
> suspended devices: on an Orange Pi 5 a SanDisk Extreme drive and a card
> reader behind a USB3 hub are disconnected and enumerated again after
> every resume, which kills a filesystem mounted on them.
> 
> Set keep_host_bus_in_s2idle for RK3588, so the core keeps the suspended
> bus in suspend-to-idle. RK3576 is left as it is: its second controller
> is in PD_PHP, which is switched off in suspend-to-idle.
> 
> Signed-off-by: Arun Iyengar <aiyengar1990@gmail.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261112-dwc3-s2idle-optin-v1-0-842e3f8413d0@gmail.com?part=2