From: Artur Petrosyan Arthur.Petrosyan@synopsys.com
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@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 --- 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); } }