diff options
| author | Thinh Nguyen <Thinh.Nguyen@synopsys.com> | 2019-10-23 19:15:43 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-15 10:39:19 +0100 |
| commit | 5b738211fb59e114727381d07c647a77c0010996 (patch) | |
| tree | a3d63ce667cf15b11ee4ad2e21555e1e4035d27d /drivers/usb/dwc3/gadget.h | |
| parent | 704a940d551c9946bce3fdd661e00a6370c40522 (diff) | |
usb: dwc3: gadget: Don't send unintended link state change
DCTL.ULSTCHNGREQ is a write-only field. When doing a read-modify-write
to DCTL, the driver must make sure that there's no unintended link state
change request from whatever is read from DCTL.ULSTCHNGREQ. Set link
state change to no-action when the driver writes to DCTL.
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/dwc3/gadget.h')
| -rw-r--r-- | drivers/usb/dwc3/gadget.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/gadget.h b/drivers/usb/dwc3/gadget.h index 5faf4d1249e0..fbc7d8013f0b 100644 --- a/drivers/usb/dwc3/gadget.h +++ b/drivers/usb/dwc3/gadget.h @@ -127,4 +127,18 @@ static inline void dwc3_gadget_ep_get_transfer_index(struct dwc3_ep *dep) dep->resource_index = DWC3_DEPCMD_GET_RSC_IDX(res_id); } +/** + * dwc3_gadget_dctl_write_safe - write to DCTL safe from link state change + * @dwc: pointer to our context structure + * @value: value to write to DCTL + * + * Use this function when doing read-modify-write to DCTL. It will not + * send link state change request. + */ +static inline void dwc3_gadget_dctl_write_safe(struct dwc3 *dwc, u32 value) +{ + value &= ~DWC3_DCTL_ULSTCHNGREQ_MASK; + dwc3_writel(dwc->regs, DWC3_DCTL, value); +} + #endif /* __DRIVERS_USB_DWC3_GADGET_H */ |