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FAILED: patch "[PATCH] usb: dwc2: Fix session request interrupt handler" failed to apply to 4.4-stable tree

PATCH [email protected] 1 participant 1 message May 10, 2021

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Stable branch USB DesignWare USB2 DRD IP driver
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The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 42b32b164acecd850edef010915a02418345a033 Mon Sep 17 00:00:00 2001
From: Artur Petrosyan <[email protected]>
Date: Thu, 8 Apr 2021 13:45:49 +0400
Subject: [PATCH] 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 21795c826a45 ("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] open here
Signed-off-by Greg Kroah-Hartman <[email protected]>
drivers/usb/dwc2/core_intr.c +8 -0
index 0a7f9330907f..8c0152b514be 100644
@@ -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);
 	}
 }