usb: dwc2: Fix session request interrupt handler

According to programming guide in host mode, port power must be turned on in session request interrupt handlers. Fixes: 21795c8 ("usb: dwc2: exit hibernation on session request") Cc: <[email protected]> Acked-by: Minas Harutyunyan <[email protected]> Signed-off-by: Artur Petrosyan <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]>
intel-lab-lkp · Apr 9, 2021 · 42b32b1 · 42b32b1
1 parent 75f43ac
commit 42b32b1
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/drivers/usb/dwc2/core_intr.c b/drivers/usb/dwc2/core_intr.c
@@ -307,6 +307,7 @@ static void dwc2_handle_conn_id_status_change_intr(struct dwc2_hsotg *hsotg)
 static void dwc2_handle_session_req_intr(struct dwc2_hsotg *hsotg)
 {
 	int ret;
+	u32 hprt0;
 
 	/* Clear interrupt */
 	dwc2_writel(hsotg, GINTSTS_SESSREQINT, GINTSTS);
@@ -328,6 +329,13 @@ static void dwc2_handle_session_req_intr(struct dwc2_hsotg *hsotg)
 		 * 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);
 	}
 }