The patch below does not apply to the 4.9-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 stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 42b32b164acecd850edef010915a02418345a033 Mon Sep 17 00:00:00 2001
From: Artur Petrosyan Arthur.Petrosyan@synopsys.com 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: stable@vger.kernel.org Acked-by: Minas Harutyunyan Minas.Harutyunyan@synopsys.com Signed-off-by: Artur Petrosyan Arthur.Petrosyan@synopsys.com Link: https://lore.kernel.org/r/20210408094550.75484A0094@mailhost.synopsys.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
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); } }