Revert "usb: dwc3: don't reset device side if dwc3 was configured as host-only"

commit afe28cd686aeb77e8d9140d50fb1cf06a7ecb731 upstream.

This reverts commit e835c0a4e23c38531dcee5ef77e8d1cf462658c7.

Don't omit soft-reset. During initialization, the driver may need to
perform a soft reset to ensure the phy is ready when the controller
updates the GCTL.PRTCAPDIR or other settings by issuing phy soft-reset.
Many platforms often have access to DCTL register for soft-reset despite
being host-only. If there are actual reported issues from the platforms
that don't expose DCTL registers, then we will need to revisit (perhaps
to teach dwc3 to perform xhci's soft-reset USBCMD.HCRST).

Cc:  <stable@vger.kernel.org>
Fixes: e835c0a4e23c ("usb: dwc3: don't reset device side if dwc3 was configured as host-only")
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/7668ab11a48f260820825274976eb41fec7f54d1.1703282469.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index d9b9bd2..b73b79f 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -277,9 +277,9 @@ int dwc3_core_soft_reset(struct dwc3 *dwc)
        /*
         * We're resetting only the device side because, if we're in host mode,
         * XHCI driver will reset the host block. If dwc3 was configured for
-        * host-only mode or current role is host, then we can return early.
+        * host-only mode, then we can return early.
         */
-       if (dwc->dr_mode == USB_DR_MODE_HOST || dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST)
+       if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST)
                return 0;
 
        reg = dwc3_readl(dwc->regs, DWC3_DCTL);