5.4-stable review patch. If anyone has any objections, please let me know.
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From: Stefan Wahren wahrenst@gmx.net
commit a8d3e4a734599c7d0f6735f8db8a812e503395dd upstream.
On Rasperry Pis without onboard USB hub the power cycle during power connect init only disable the port but never enabled it again:
usb usb1-port1: attempt power cycle
The port relevant part in dwc2_hcd_hub_control() is skipped in case port_connect_status = 0 under the assumption the core is or will be soon in device mode. But this assumption is wrong, because after ClearPortFeature USB_PORT_FEAT_POWER the port_connect_status will also be 0 and SetPortFeature (incl. USB_PORT_FEAT_POWER) will be a no-op.
Fix the behavior of dwc2_hcd_hub_control() by replacing the port_connect_status check with dwc2_is_device_mode().
Link: https://github.com/raspberrypi/linux/issues/6247 Fixes: 7359d482eb4d ("staging: HCD files for the DWC2 driver") Signed-off-by: Stefan Wahren wahrenst@gmx.net Link: https://lore.kernel.org/r/20241202001631.75473-3-wahrenst@gmx.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/dwc2/hcd.c | 16 ++++++---------- 1 file changed, 6 insertions(+), 10 deletions(-)
--- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -3544,11 +3544,9 @@ static int dwc2_hcd_hub_control(struct d port_status |= USB_PORT_STAT_C_OVERCURRENT << 16; }
- if (!hsotg->flags.b.port_connect_status) { + if (dwc2_is_device_mode(hsotg)) { /* - * The port is disconnected, which means the core is - * either in device mode or it soon will be. Just - * return 0's for the remainder of the port status + * Just return 0's for the remainder of the port status * since the port register can't be read if the core * is in device mode. */ @@ -3618,13 +3616,11 @@ static int dwc2_hcd_hub_control(struct d if (wvalue != USB_PORT_FEAT_TEST && (!windex || windex > 1)) goto error;
- if (!hsotg->flags.b.port_connect_status) { + if (dwc2_is_device_mode(hsotg)) { /* - * The port is disconnected, which means the core is - * either in device mode or it soon will be. Just - * return without doing anything since the port - * register can't be written if the core is in device - * mode. + * Just return 0's for the remainder of the port status + * since the port register can't be read if the core + * is in device mode. */ break; }