Messages in this thread | | | Date | Tue, 16 May 2023 19:58:10 +0530 | Subject | Re: [PATCH v8 4/9] usb: dwc3: core: Skip setting event buffers for host only controllers | From | Krishna Kurapati PSSNV <> |
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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,
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