Messages in this thread Patch in this message | | | From | Krishna Kurapati <> | Subject | [PATCH v10 04/11] usb: dwc3: core: Skip setting event buffers for host only controllers | Date | Fri, 28 Jul 2023 04:03:00 +0530 |
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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
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