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usb: core: Enable xhci irq after starting controller

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There is a possibility of port change event triggering
xhci irq as soon as halt bit is cleared in xhci_start().
As a result before xhci state is changed from XHCI_STATE_HALTED
to 0 port change event keeps on generated until port status is
acknowledged. This does not allow xhci_start() to finish and handle
the port change event if irq is keep on getting fired on same core
where xhci_start() is running. Fix this issue by disabling irq before
starting controller and enable it back after clearing halt bit.

Change-Id: I798620f99a7ba522258455642e6e8091ebf2cd34
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
This commit is contained in:
Hemant Kumar 2017-03-17 14:02:00 -07:00 • committed by Jack Pham
commit 517f1673b8
1 changed files with 8 additions and 0 deletions
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8
drivers/usb/host/xhci.c
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@ -132,7 +132,13 @@ int xhci_start(struct xhci_hcd *xhci)
{
u32 temp;
int ret;
struct usb_hcd *hcd = xhci_to_hcd(xhci);
/*
* disable irq to avoid xhci_irq flooding due to unhandeled port
* change event in halt state, as soon as xhci_start clears halt bit
*/
disable_irq(hcd->irq);
temp = readl(&xhci->op_regs->command);
temp |= (CMD_RUN);
xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Turn on HC, cmd = 0x%x.",
@ -153,6 +159,8 @@ int xhci_start(struct xhci_hcd *xhci)
/* clear state flags. Including dying, halted or removing */
xhci->xhc_state = 0;
enable_irq(hcd->irq);
return ret;
}