| Message ID | 20230727223307.8096-5-quic_kriskura@quicinc.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add multiport support for DWC3 controllers | expand |
On Fri, Jul 28, 2023, Krishna Kurapati wrote: > On some SoC's like SA8295P where the tertiary controller is host-only > capable, GEVTADDRHI/LO, GEVTSIZ, GEVTCOUNT registers are not accessible. > Trying to access them leads to a crash. > > For DRD/Peripheral supported controllers, event buffer setup is done > again in gadget_pullup. Skip setup or cleanup of event buffers if > controller is host-only capable. > > Suggested-by: Johan Hovold <johan@kernel.org> > Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com> > --- > drivers/usb/dwc3/core.c | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > index edc79ce70588..0aa58600a566 100644 > --- a/drivers/usb/dwc3/core.c > +++ b/drivers/usb/dwc3/core.c > @@ -486,6 +486,13 @@ static void dwc3_free_event_buffers(struct dwc3 *dwc) > static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned int length) > { > struct dwc3_event_buffer *evt; > + unsigned int hw_mode; > + > + hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); > + if (hw_mode == DWC3_GHWPARAMS0_MODE_HOST) { > + dwc->ev_buf = NULL; > + return 0; > + } > > evt = dwc3_alloc_one_event_buffer(dwc, length); > if (IS_ERR(evt)) { > @@ -507,6 +514,9 @@ int dwc3_event_buffers_setup(struct dwc3 *dwc) > { > struct dwc3_event_buffer *evt; > > + if (!dwc->ev_buf) > + return 0; > + > evt = dwc->ev_buf; > evt->lpos = 0; > dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(0), > @@ -524,6 +534,9 @@ void dwc3_event_buffers_cleanup(struct dwc3 *dwc) > { > struct dwc3_event_buffer *evt; > > + if (!dwc->ev_buf) > + return; > + > evt = dwc->ev_buf; > > evt->lpos = 0; > -- > 2.40.0 > Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com> Thanks, Thinh
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index edc79ce70588..0aa58600a566 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -486,6 +486,13 @@ static void dwc3_free_event_buffers(struct dwc3 *dwc) static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned int length) { struct dwc3_event_buffer *evt; + unsigned int hw_mode; + + hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); + if (hw_mode == DWC3_GHWPARAMS0_MODE_HOST) { + dwc->ev_buf = NULL; + return 0; + } evt = dwc3_alloc_one_event_buffer(dwc, length); if (IS_ERR(evt)) { @@ -507,6 +514,9 @@ int dwc3_event_buffers_setup(struct dwc3 *dwc) { struct dwc3_event_buffer *evt; + if (!dwc->ev_buf) + return 0; + evt = dwc->ev_buf; evt->lpos = 0; dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(0), @@ -524,6 +534,9 @@ void dwc3_event_buffers_cleanup(struct dwc3 *dwc) { struct dwc3_event_buffer *evt; + if (!dwc->ev_buf) + return; + evt = dwc->ev_buf; evt->lpos = 0;
On some SoC's like SA8295P where the tertiary controller is host-only capable, GEVTADDRHI/LO, GEVTSIZ, GEVTCOUNT registers are not accessible. Trying to access them leads to a crash. For DRD/Peripheral supported controllers, event buffer setup is done again in gadget_pullup. Skip setup or cleanup of event buffers if controller is host-only capable. Suggested-by: Johan Hovold <johan@kernel.org> Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com> --- drivers/usb/dwc3/core.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)