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UPSTREAM: usb: dwc3: core: Skip setting event buffers for host only controllers

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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>
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>

(cherry picked from commit 89d7f96299
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master)
Bug: 363901338
Bug: 233985973
Change-Id: I66bccca575b3524b8e446f38b154d2434335a65d
Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
(cherry picked from commit f6b99539f84bb4c327e041fcd12d78544ef09bf5)
This commit is contained in:
Krishna Kurapati 2024-04-20 10:18:55 +05:30 committed by Treehugger Robot
parent 921a6d1cc4
commit cf502a22fe
1 changed files with 13 additions and 0 deletions
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13
drivers/usb/dwc3/core.c
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@ -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;