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usb: gadget: aspeed: Fix EP0 stall handling 

When stalling EP0, we need to wait for an ACK interrupt,
otherwise we may get out of sync on the next setup packet
data phase. Also we need to ignore the direction when
processing that interrupt as the HW reports a potential
mismatch.

Implement this by adding a stall state to EP0. This fixes
some reported issues with mass storage and some hosts.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Benjamin Herrenschmidt 2019-07-26 15:05:32 +10:00 committed by Felipe Balbi
parent d042c35eb8
commit 7e420cef90
2 changed files with 33 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
drivers/usb/gadget/udc/aspeed-vhub/ep0.c
View File

@ -105,18 +105,20 @@ void ast_vhub_ep0_handle_setup(struct ast_vhub_ep *ep)
(crq.bRequestType & USB_DIR_IN) ? "in" : "out",
ep->ep0.state);
/* Check our state, cancel pending requests if needed */
if (ep->ep0.state != ep0_state_token) {
/*
* Check our state, cancel pending requests if needed
*
* Note: Under some circumstances, we can get a new setup
* packet while waiting for the stall ack, just accept it.
*
* In any case, a SETUP packet in wrong state should have
* reset the HW state machine, so let's just log, nuke
* requests, move on.
*/
if (ep->ep0.state != ep0_state_token &&
ep->ep0.state != ep0_state_stall) {
EPDBG(ep, "wrong state\n");
ast_vhub_nuke(ep, -EIO);
/*
* Accept the packet regardless, this seems to happen
* when stalling a SETUP packet that has an OUT data
* phase.
*/
ast_vhub_nuke(ep, 0);
goto stall;
}
/* Calculate next state for EP0 */
@ -165,7 +167,7 @@ void ast_vhub_ep0_handle_setup(struct ast_vhub_ep *ep)
stall:
EPDBG(ep, "stalling\n");
writel(VHUB_EP0_CTRL_STALL, ep->ep0.ctlstat);
ep->ep0.state = ep0_state_status;
ep->ep0.state = ep0_state_stall;
ep->ep0.dir_in = false;
return;
@ -299,8 +301,8 @@ void ast_vhub_ep0_handle_ack(struct ast_vhub_ep *ep, bool in_ack)
if ((ep->ep0.dir_in && (stat & VHUB_EP0_TX_BUFF_RDY)) ||
(!ep->ep0.dir_in && (stat & VHUB_EP0_RX_BUFF_RDY)) ||
(ep->ep0.dir_in != in_ack)) {
/* In that case, ignore interrupt */
dev_warn(dev, "irq state mismatch");
stall = true;
break;
}
/*
@ -335,12 +337,22 @@ void ast_vhub_ep0_handle_ack(struct ast_vhub_ep *ep, bool in_ack)
dev_warn(dev, "status direction mismatch\n");
stall = true;
}
break;
case ep0_state_stall:
/*
* There shouldn't be any request left, but nuke just in case
* otherwise the stale request will block subsequent ones
*/
ast_vhub_nuke(ep, -EIO);
break;
}
/* Reset to token state */
ep->ep0.state = ep0_state_token;
if (stall)
/* Reset to token state or stall */
if (stall) {
writel(VHUB_EP0_CTRL_STALL, ep->ep0.ctlstat);
ep->ep0.state = ep0_state_stall;
} else
ep->ep0.state = ep0_state_token;
}
static int ast_vhub_ep0_queue(struct usb_ep* u_ep, struct usb_request *u_req,
@ -390,8 +402,12 @@ static int ast_vhub_ep0_queue(struct usb_ep* u_ep, struct usb_request *u_req,
spin_lock_irqsave(&vhub->lock, flags);
/* EP0 can only support a single request at a time */
if (!list_empty(&ep->queue) || ep->ep0.state == ep0_state_token) {
if (!list_empty(&ep->queue) ||
ep->ep0.state == ep0_state_token ||
ep->ep0.state == ep0_state_stall) {
dev_warn(dev, "EP0: Request in wrong state\n");
EPVDBG(ep, "EP0: list_empty=%d state=%d\n",
list_empty(&ep->queue), ep->ep0.state);
spin_unlock_irqrestore(&vhub->lock, flags);
return -EBUSY;
}

1
drivers/usb/gadget/udc/aspeed-vhub/vhub.h
View File

@ -257,6 +257,7 @@ enum ep0_state {
ep0_state_token,
ep0_state_data,
ep0_state_status,
ep0_state_stall,
};
/*