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usb: mtu3: allow system suspend during active gadget connection

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When operating in gadget mode connected to a USB host, system suspend
fails with -EBUSY because active peripheral connections block suspend
entry.

Fix this by restricting the -EBUSY check to runtime autosuspend
(PMSG_IS_AUTO). For system suspend (!PMSG_IS_AUTO), perform soft
disconnect to disconnect from the bus and allow MAC sleep.

Fixes: 427c66422e ("usb: mtu3: support suspend/resume for device mode")
Signed-off-by: Fei Shao <fshao@chromium.org>
Link: https://patch.msgid.link/20260626082218.2750459-2-fshao@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fei Shao 2026-06-26 16:21:51 +08:00 committed by Greg Kroah-Hartman
parent ff14cf71c8
commit e69027c253
1 changed files with 10 additions and 1 deletions
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11
drivers/usb/mtu3/mtu3_core.c
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@ -1037,9 +1037,14 @@ int ssusb_gadget_suspend(struct ssusb_mtk *ssusb, pm_message_t msg)
if (!mtu->gadget_driver)
return 0;
if (mtu->connected)
/* Prevent runtime suspend when active connection exists */
if (mtu->connected && PMSG_IS_AUTO(msg))
return -EBUSY;
/* Perform soft disconnect for system suspend */
if (mtu->softconnect && !PMSG_IS_AUTO(msg))
mtu3_dev_on_off(mtu, 0);
mtu3_dev_suspend(mtu);
synchronize_irq(mtu->irq);
@ -1055,5 +1060,9 @@ int ssusb_gadget_resume(struct ssusb_mtk *ssusb, pm_message_t msg)
mtu3_dev_resume(mtu);
/* Restore soft connect for system resume */
if (mtu->softconnect && !PMSG_IS_AUTO(msg))
mtu3_dev_on_off(mtu, 1);
return 0;
}