linux-kernel - [PATCH v3] usb: ohci-at91: Fix the unhandle interrupt when resume

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Date:   Mon, 26 Jun 2023 23:27:13 +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 v3] 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 by setting "hibernated" argument of
ohci_resume().

Signed-off-by: Guiting Shen <aarongt.shen@...il.com>
---
 drivers/usb/host/ohci-at91.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index 533537ef3c21..360680769494 100644
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -673,7 +673,13 @@ ohci_hcd_at91_drv_resume(struct device *dev)
 	else
 		at91_start_clock(ohci_at91);
 
-	ohci_resume(hcd, false);
+	/*
+	 * According to the comment in ohci_hcd_at91_drv_suspend()
+	 * we need to do a reset if the 48Mhz clock was stopped,
+	 * that is, if ohci_at91->wakeup is clear. Tell ohci_resume()
+	 * to reset in this case by setting its "hibernated" flag.
+	 */
+	ohci_resume(hcd, !ohci_at91->wakeup);
 
 	return 0;
 }
-- 
2.25.1