This is a note to let you know that I've just added the patch titled
usb: dwc2: Fix session request interrupt handler
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-dwc2-fix-session-request-interrupt-handler.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 42b32b164acecd850edef010915a02418345a033 Mon Sep 17 00:00:00 2001
From: Artur Petrosyan <Arthur.Petrosyan@xxxxxxxxxxxx>
Date: Thu, 8 Apr 2021 13:45:49 +0400
Subject: usb: dwc2: Fix session request interrupt handler
From: Artur Petrosyan <Arthur.Petrosyan@xxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Acked-by: Minas Harutyunyan <Minas.Harutyunyan@xxxxxxxxxxxx>
Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210408094550.75484A0094@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/dwc2/core_intr.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- 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);
}
}
Patches currently in stable-queue which might be from Arthur.Petrosyan@xxxxxxxxxxxx are
queue-4.19/usb-dwc2-fix-session-request-interrupt-handler.patch
