linux-kernel - [PATCH v2] usb: ohci-at91: Fix the unhandle interrupt when resume

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Message-Id: <20230625161553.11073-1-aarongt.shen@gmail.com>
Date:   Mon, 26 Jun 2023 00:15:53 +0800
From:   Guiting Shen <aarongt.shen@...il.com>
To:     stern@...land.harvard.edu, gregkh@...uxfoundation.org,
        nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com,
        claudiu.beznea@...rochip.com
Cc:     linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Guiting Shen <aarongt.shen@...il.com>
Subject: [PATCH v2] usb: ohci-at91: Fix the unhandle interrupt when resume

The ohci_hcd_at91_drv_suspend() sets ohci->rh_state to OHCI_RH_HALTED when
suspend which will let the ohci_irq() skip the interrupt after resume. And
nobody to handle this interrupt.

According to the comment in ohci_hcd_at91_drv_suspend(), it need to reset
when resume from suspend(MEM) to fix.

Signed-off-by: Guiting Shen <aarongt.shen@...il.com>
---
 drivers/usb/host/ohci-at91.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index b9ce8d80f20b..1a0356d9ea15 100644
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -672,7 +672,12 @@ ohci_hcd_at91_drv_resume(struct device *dev)
 	else
 		at91_start_clock(ohci_at91);
 
-	ohci_resume(hcd, false);
+	/*
+	 * need to reset according to the comment of suspend routine,
+	 * otherwise the ohci_irq would skip the interrupt if ohci_state
+	 * was OHCI_RH_HALTED.
+	 */
+	ohci_resume(hcd, !ohci_at91->wakeup);
 
 	return 0;
 }
-- 
2.25.1