diff mbox series

[4.19,111/425] usb: dwc2: Fix session request interrupt handler

Message ID 20210520092135.097811695@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH May 20, 2021, 9:18 a.m. UTC 
From: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>

commit 42b32b164acecd850edef010915a02418345a033 upstream.

According to programming guide in host mode, port
power must be turned on in session request
interrupt handlers.

Fixes: 21795c826a45 ("usb: dwc2: exit hibernation on session request")
Cc: <stable@vger.kernel.org>
Acked-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210408094550.75484A0094@mailhost.synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/usb/dwc2/core_intr.c |    8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

--- a/drivers/usb/dwc2/core_intr.c
+++ b/drivers/usb/dwc2/core_intr.c
@@ -312,6 +312,7 @@  static void dwc2_handle_conn_id_status_c
 static void dwc2_handle_session_req_intr(struct dwc2_hsotg *hsotg)
 {
 	int ret;
+	u32 hprt0;
 
 	/* Clear interrupt */
 	dwc2_writel(hsotg, GINTSTS_SESSREQINT, GINTSTS);
@@ -332,6 +333,13 @@  static void dwc2_handle_session_req_intr
 		 * established
 		 */
 		dwc2_hsotg_disconnect(hsotg);
+	} else {
+		/* Turn on the port power bit. */
+		hprt0 = dwc2_read_hprt0(hsotg);
+		hprt0 |= HPRT0_PWR;
+		dwc2_writel(hsotg, hprt0, HPRT0);
+		/* Connect hcd after port power is set. */
+		dwc2_hcd_connect(hsotg);
 	}
 }