5.4-stable review patch. If anyone has any objections, please let me know.
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From: Krishna Kurapati quic_kriskura@quicinc.com
[ Upstream commit 89d7f962994604a3e3d480832788d06179abefc5 ]
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 Acked-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Reviewed-by: Johan Hovold johan+linaro@kernel.org Reviewed-by: Bjorn Andersson andersson@kernel.org Tested-by: Johan Hovold johan+linaro@kernel.org Link: https://lore.kernel.org/r/20240420044901.884098-4-quic_kriskura@quicinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 12e72e804278e..cbe475134b3c6 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -391,6 +391,13 @@ static void dwc3_free_event_buffers(struct dwc3 *dwc) static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned 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)) { @@ -412,6 +419,9 @@ 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), @@ -429,6 +439,9 @@ 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;