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usb: dwc3: gadget: WARN on no-resource status

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If the driver issued START_TRANSFER and received a no-resource status,
then generally there are a few reasons for this:

1) The driver did not allocate resource for the endpoint during
power-on-reset initialization.

2) The transfer resource was reset. At this moment, we don't do this in
the driver, but it occurs when the driver issues START_CONFIG cmd to ep0
with resource index=2.

3) The driver issues the START_TRANSFER command to an already started
endpoint. Usually, this is because the END_TRANSFER command hasn't
completed yet.

Print out a warning to help debug this issue in the driver.

Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Git-commit: f7ac582effc6ee416eb51e0c3e55836aaf7231ac
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Change-Id: I6d996d4102cb5023700024e0ba6a33cd021e38b8
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
This commit is contained in:
Thinh Nguyen 2020-03-29 16:13:16 -07:00 • committed by Gerrit - the friendly Code Review server
commit 71dd6c4d07
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/dwc3/gadget.c
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@ -433,6 +433,8 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
ret = 0;
break;
case DEPEVT_TRANSFER_NO_RESOURCE:
dev_WARN(dwc->dev, "No resource for %s\n",
dep->name);
ret = -EINVAL;
break;
case DEPEVT_TRANSFER_BUS_EXPIRY: