| Message ID | 20230514054917.21318-5-quic_kriskura@quicinc.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add multiport support for DWC3 controllers | expand |
On Sun, May 14, 2023 at 11:19:12AM +0530, Krishna Kurapati wrote: > On some SoC's like SA8295P where the tertiary controller is host-only Please add "Qualcomm" before SA8295P. > capable, GEVTADDRHI/LO, GEVTSIZ, GEVTCOUNT registers are not accessible. > Trying to setup them up during core_init leads to a crash. s/setup/access/ (or "write to"?) and presumably this is a problem beyond core_init, so I would suggest dropping "up during core_init" from the sentence. > > 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. > With that, this looks reasonable to me. Reviewed-by: Bjorn Andersson <andersson@kernel.org> Regards, Bjorn > Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com> > --- > drivers/usb/dwc3/core.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > index e983aef1fb93..46192d08d1b6 100644 > --- a/drivers/usb/dwc3/core.c > +++ b/drivers/usb/dwc3/core.c > @@ -505,6 +505,11 @@ static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned int length) > int dwc3_event_buffers_setup(struct dwc3 *dwc) > { > struct dwc3_event_buffer *evt; > + unsigned int hw_mode; > + > + hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); > + if (hw_mode == DWC3_GHWPARAMS0_MODE_HOST) > + return 0; > > evt = dwc->ev_buf; > evt->lpos = 0; > @@ -522,6 +527,11 @@ int dwc3_event_buffers_setup(struct dwc3 *dwc) > void dwc3_event_buffers_cleanup(struct dwc3 *dwc) > { > struct dwc3_event_buffer *evt; > + unsigned int hw_mode; > + > + hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); > + if (hw_mode == DWC3_GHWPARAMS0_MODE_HOST) > + return; > > evt = dwc->ev_buf; > > -- > 2.40.0 >
On Sun, May 14, 2023 at 11:19:12AM +0530, 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 setup them up during core_init 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. > > Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com> > --- > drivers/usb/dwc3/core.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > index e983aef1fb93..46192d08d1b6 100644 > --- a/drivers/usb/dwc3/core.c > +++ b/drivers/usb/dwc3/core.c > @@ -505,6 +505,11 @@ static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned int length) > int dwc3_event_buffers_setup(struct dwc3 *dwc) > { > struct dwc3_event_buffer *evt; > + unsigned int hw_mode; > + > + hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); > + if (hw_mode == DWC3_GHWPARAMS0_MODE_HOST) > + return 0; > > evt = dwc->ev_buf; How about adding this check to dwc3_alloc_event_buffers() instead as there should be no need to allocate buffer that you never use? Then you can just check dwc->ev_buf here and elsewhere. Johan
On 5/16/2023 5:47 PM, Johan Hovold wrote: > On Sun, May 14, 2023 at 11:19:12AM +0530, 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 setup them up during core_init 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. >> >> Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com> >> --- >> drivers/usb/dwc3/core.c | 10 ++++++++++ >> 1 file changed, 10 insertions(+) >> >> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c >> index e983aef1fb93..46192d08d1b6 100644 >> --- a/drivers/usb/dwc3/core.c >> +++ b/drivers/usb/dwc3/core.c >> @@ -505,6 +505,11 @@ static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned int length) >> int dwc3_event_buffers_setup(struct dwc3 *dwc) >> { >> struct dwc3_event_buffer *evt; >> + unsigned int hw_mode; >> + >> + hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); >> + if (hw_mode == DWC3_GHWPARAMS0_MODE_HOST) >> + return 0; >> >> evt = dwc->ev_buf; > > How about adding this check to dwc3_alloc_event_buffers() instead as > there should be no need to allocate buffer that you never use? > > Then you can just check dwc->ev_buf here and elsewhere. > Thanks for this idea. We can save 4096 bytes from being allocated this way. Will get this in next version. Regards, Krishna,
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index e983aef1fb93..46192d08d1b6 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -505,6 +505,11 @@ static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned int length) int dwc3_event_buffers_setup(struct dwc3 *dwc) { struct dwc3_event_buffer *evt; + unsigned int hw_mode; + + hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); + if (hw_mode == DWC3_GHWPARAMS0_MODE_HOST) + return 0; evt = dwc->ev_buf; evt->lpos = 0; @@ -522,6 +527,11 @@ int dwc3_event_buffers_setup(struct dwc3 *dwc) void dwc3_event_buffers_cleanup(struct dwc3 *dwc) { struct dwc3_event_buffer *evt; + unsigned int hw_mode; + + hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0); + if (hw_mode == DWC3_GHWPARAMS0_MODE_HOST) + return; evt = dwc->ev_buf;
On some SoC's like SA8295P where the tertiary controller is host-only capable, GEVTADDRHI/LO, GEVTSIZ, GEVTCOUNT registers are not accessible. Trying to setup them up during core_init 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. Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com> --- drivers/usb/dwc3/core.c | 10 ++++++++++ 1 file changed, 10 insertions(+)