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UPSTREAM: usb: dwc3: Wait for EndXfer command completion

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DWC3 programming guide mentions that when operating in USB2.0 speeds,
if GUSB2PHYCFG[6] or GUSB2PHYCFG[8] is set, it must be cleared prior
to issuing commands and may be set again  after the command completes.
But currently while issuing EndXfer command without CmdIOC set, we
wait for 1ms after GUSB2PHYCFG is restored. This results in cases
where EndXfer command doesn't get completed and causes SMMU faults
since requests are unmapped afterwards. Hence restore GUSB2PHYCFG
after waiting for EndXfer command completion.

Cc: stable@vger.kernel.org
Fixes: 1d26ba0944d3 ("usb: dwc3: Wait unconditionally after issuing EndXfer command")
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20240924093208.2524531-1-quic_prashk@quicinc.com
Signed-off-by: Prashanth K <quic_prashk@quicinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Git-commit: c96e31252110a84dcc44412e8a7b456b33c3e298
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git.

Change-Id: I4015b2190d984ffa10e89348cd375ab355e28531
Signed-off-by: Prashanth K <prashanth.k@oss.qualcomm.com>
Signed-off-by: Akash Kumar <akakum@qti.qualcomm.com>
This commit is contained in:
Prashanth K 2025-09-10 14:52:27 +05:30 • committed by Akash Kumar
commit 537b227223
1 changed files with 4 additions and 3 deletions
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7
drivers/usb/dwc3/gadget.c
View file

@ -491,6 +491,10 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
dwc3_gadget_ep_get_transfer_index(dep);
}
if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_ENDTRANSFER &&
!(cmd & DWC3_DEPCMD_CMDIOC))
mdelay(1);
if (saved_config) {
reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
reg |= saved_config;
@ -3705,9 +3709,6 @@ int dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force, bool interrupt)
else
dep->flags |= DWC3_EP_END_TRANSFER_PENDING;
if (dwc3_is_usb31(dwc) || dwc->revision < DWC3_REVISION_310A)
udelay(100);
return ret;
}
EXPORT_SYMBOL(dwc3_stop_active_transfer);