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

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Message-Id: <20210408094550.75484A0094@mailhost.synopsys.com>
Date:   Thu, 08 Apr 2021 13:45:49 +0400
From:   Artur Petrosyan <Arthur.Petrosyan@...opsys.com>
To:     John Youn <John.Youn@...opsys.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mian Yousaf Kaukab <yousaf.kaukab@...el.com>,
        Gregory Herrero <gregory.herrero@...el.com>
Cc:     Artur Petrosyan <Arthur.Petrosyan@...opsys.com>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        <stable@...r.kernel.org>, Robert Baldyga <r.baldyga@...sung.com>
Subject: [PATCH v3 11/14] 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.

Cc: <stable@...r.kernel.org>
Fixes: 21795c826a45 ("usb: dwc2: exit hibernation on session request")
Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@...opsys.com>
Acked-by: Minas Harutyunyan <Minas.Harutyunyan@...opsys.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