From 2aad4b8d8960ff3190a2aede8b7cf69502a91e8f Mon Sep 17 00:00:00 2001 From: Krishna Kurapati Date: Sat, 20 Apr 2024 10:18:55 +0530 Subject: [PATCH] usb: dwc3: core: Skip setting event buffers for host only controllers [ 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 Signed-off-by: Krishna Kurapati Acked-by: Thinh Nguyen Reviewed-by: Johan Hovold Reviewed-by: Bjorn Andersson Tested-by: Johan Hovold Link: https://lore.kernel.org/r/20240420044901.884098-4-quic_kriskura@quicinc.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- 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 94bc7786a3c4..4964fa7419ef 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -506,6 +506,13 @@ 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)) { @@ -527,6 +534,9 @@ 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), @@ -544,6 +554,9 @@ 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;