[PATCH v3 11/14] usb: dwc2: Fix session request interrupt handler

[Artur Petrosyan]

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

Cc: <sta...@vger.kernel.org>
Fixes: 21795c826a45 ("usb: dwc2: exit hibernation on session request")
Signed-off-by: Artur Petrosyan <arthur.petros...@synopsys.com>
Acked-by: Minas Harutyunyan <minas.harutyun...@synopsys.com>
---
 drivers/usb/dwc2/core_intr.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/usb/dwc2/core_intr.c b/drivers/usb/dwc2/core_intr.c
index 0a7f9330907f..8c0152b514be 100644
--- 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);
        }
 }
 
-- 
2.25.1