From: Thinh Nguyen Thinh.Nguyen@synopsys.com
commit c560e76319a94a3b9285bc426c609903408e4826 upstream.
The START_TRANSFER command needs to be executed while in ON/U0 link state (with an exception during register initialization). Don't use dwc->link_state to check this since the driver only tracks the link state when the link state change interrupt is enabled. Check the link state from DSTS register instead.
Note that often the host already brings the device out of low power before it sends/requests the next transfer. So, the user won't see any issue when the device starts transfer then. This issue is more noticeable in cases when the device delays starting transfer, which can happen during delayed control status after the host put the device in low power.
Fixes: 799e9dc82968 ("usb: dwc3: gadget: conditionally disable Link State change events") Cc: stable@vger.kernel.org Acked-by: Felipe Balbi balbi@kernel.org Signed-off-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Link: https://lore.kernel.org/r/bcefaa9ecbc3e1936858c0baa14de6612960e909.161888422... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/dwc3/gadget.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-)
--- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -308,13 +308,12 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ }
if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) { - int needs_wakeup; + int link_state;
- needs_wakeup = (dwc->link_state == DWC3_LINK_STATE_U1 || - dwc->link_state == DWC3_LINK_STATE_U2 || - dwc->link_state == DWC3_LINK_STATE_U3); - - if (unlikely(needs_wakeup)) { + link_state = dwc3_gadget_get_link_state(dwc); + if (link_state == DWC3_LINK_STATE_U1 || + link_state == DWC3_LINK_STATE_U2 || + link_state == DWC3_LINK_STATE_U3) { ret = __dwc3_gadget_wakeup(dwc); dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n", ret); @@ -1975,6 +1974,8 @@ static int __dwc3_gadget_wakeup(struct d case DWC3_LINK_STATE_RESET: case DWC3_LINK_STATE_RX_DET: /* in HS, means Early Suspend */ case DWC3_LINK_STATE_U3: /* in HS, means SUSPEND */ + case DWC3_LINK_STATE_U2: /* in HS, means Sleep (L1) */ + case DWC3_LINK_STATE_U1: case DWC3_LINK_STATE_RESUME: break; default: