> From: linux-usb-ow...@vger.kernel.org > [mailto:linux-usb-ow...@vger.kernel.org] On Behalf Of John Crispin > Sent: Friday, October 10, 2014 10:27 AM > > We need this for dwc2 to work on older ralink SoC like the rt3052. > > Signed-off-by: John Crispin <blo...@openwrt.org> > --- > drivers/usb/dwc2/hcd.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c > index 4d918ed..8b5f966 100644 > --- a/drivers/usb/dwc2/hcd.c > +++ b/drivers/usb/dwc2/hcd.c > @@ -47,6 +47,7 @@ > #include <linux/io.h> > #include <linux/slab.h> > #include <linux/usb.h> > +#include <linux/reset.h> > > #include <linux/usb/hcd.h> > #include <linux/usb/ch11.h> > @@ -2764,6 +2765,11 @@ int dwc2_hcd_init(struct dwc2_hsotg *hsotg, int irq, > > dev_dbg(hsotg->dev, "DWC OTG HCD INIT\n"); > > + /* reset the device if a reset controller is present */ > + retval = device_reset_optional(hsotg->dev); > + if (retval && retval != -ENOSYS) > + return retval; > + > /* Detect config values from hardware */ > retval = dwc2_get_hwparams(hsotg); >
Hmm. Can you explain this a bit more? I'm not familiar with the reset control API. But I see that there is currently no user of device_reset_optional() in the kernel. Looks like drivers typically call devm_reset_control_get() in their probe functions, then save the returned pointer and call it later to do the reset. I wonder why dwc2 would be the only driver not to do it that way? -- Paul -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
