[RFC PATCH 01/12] usb: xhci: simplify CMRT initialization logic

[Niklas Neronin <niklas.neronin@linux.intel.com>]

The function compliance_mode_recovery_timer_init() is called from
xhci_init() because the Compliance Mode Recovery Timer (CMRT) must be set
up before xhci_run() when the xhci driver is re-initialized.

To handle this case, the boolean flag 'comp_timer_running' was introduced
to track whether xhci_run() had already been called, ensuring that
xhci_resume() would not invoke compliance_mode_recovery_timer_init()
a second time.

This can be simplified by moving the 'done' label in xhci_resume() to
after the compliance_mode_recovery_timer_init() call. With this change,
the timer initialization runs only when the xhci driver has not been
re-initialized, making the 'comp_timer_running' flag unnecessary and
allowing it to be removed.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
---
 drivers/usb/host/xhci.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index b3ba16b9718c..fa3627dbe9a3 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1084,7 +1084,6 @@ int xhci_resume(struct xhci_hcd *xhci, bool power_lost, bool is_auto_resume)
 	u32			command, temp = 0;
 	struct usb_hcd		*hcd = xhci_to_hcd(xhci);
 	int			retval = 0;
-	bool			comp_timer_running = false;
 	bool			pending_portevent = false;
 	bool			suspended_usb3_devs = false;
 
@@ -1196,7 +1195,6 @@ int xhci_resume(struct xhci_hcd *xhci, bool power_lost, bool is_auto_resume)
 		retval = xhci_init(hcd);
 		if (retval)
 			return retval;
-		comp_timer_running = true;
 
 		xhci_dbg(xhci, "Start the primary HCD\n");
 		retval = xhci_run(hcd);
@@ -1265,16 +1263,16 @@ int xhci_resume(struct xhci_hcd *xhci, bool power_lost, bool is_auto_resume)
 			usb_hcd_resume_root_hub(hcd);
 		}
 	}
-done:
+
 	/*
 	 * If system is subject to the Quirk, Compliance Mode Timer needs to
 	 * be re-initialized Always after a system resume. Ports are subject
 	 * to suffer the Compliance Mode issue again. It doesn't matter if
 	 * ports have entered previously to U0 before system's suspension.
 	 */
-	if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && !comp_timer_running)
+	if (xhci->quirks & XHCI_COMP_MODE_QUIRK)
 		compliance_mode_recovery_timer_init(xhci);
-
+done:
 	if (xhci->quirks & XHCI_ASMEDIA_MODIFY_FLOWCONTROL)
 		usb_asmedia_modifyflowcontrol(to_pci_dev(hcd->self.controller));
 
-- 
2.50.1