ENGR00261451-1 usb: host: purify platform resume handler

- If the device is on the port during the system suspend,
and the USB as system wakeup source is not enabled. We
don't need to put the PHY into low power mode again after
platform resume, since usb bus layer will handle it. If
auto suspend is supported, the bus layer will put the PHY
into low power mode.
- Passed below two conditions for use cases, delete the useless
handling code.
	1. Tested plug usb devices (high/full/low speed) during the system
	suspend when usb wakeup is not enabled.
	2. Tested unplug and replug usb devices (high/full/low speed) during
	the system suspended when usb wakeup is not enabled.

Signed-off-by: Peter Chen <peter.chen@freescale.com>

diff --git a/drivers/usb/host/ehci-arc.c b/drivers/usb/host/ehci-arc.c
index 59a2f4bd2a2036cbbdf7d12dd7a58a1b31653f27..8dd8c6e926d4af153cf1f83321f66c761561735b 100755 (executable)
--- a/drivers/usb/host/ehci-arc.c
+++ b/drivers/usb/host/ehci-arc.c
@@ -797,25 +797,14 @@ static int ehci_fsl_drv_resume(struct platform_device *pdev)
                        fsl_usb_clk_gate(hcd->self.controller->platform_data, true);
                        fsl_usb_lowpower_mode(pdata, false);
 
-                       usb_host_set_wakeup(hcd->self.controller, true);
-
-#ifndef NO_FIX_DISCONNECT_ISSUE
-                       /*Unplug&plug device during suspend without remote wakeup enabled
-                       For Low and full speed device, we should power on and power off
-                       the USB port to make sure USB internal state machine work well.
-                       */
                        tmp = ehci_readl(ehci, &ehci->regs->port_status[0]);
-                       if ((tmp & PORT_CONNECT) && !(tmp & PORT_SUSPEND) &&
-                               ((tmp & (0x3<<26)) != (0x2<<26))) {
-                                       printk(KERN_DEBUG "%s will do power off and power on port.\n", pdata->name);
-                                       ehci_writel(ehci, tmp & ~(PORT_RWC_BITS | PORT_POWER),
-                                               &ehci->regs->port_status[0]);
-                                       ehci_writel(ehci, tmp | PORT_POWER,
-                                               &ehci->regs->port_status[0]);
+                       if ((tmp & PORT_CONNECT) && !hcd->self.is_b_host) {
+                               set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+                       } else if (!(tmp & PORT_CONNECT)) {
+                               usb_host_set_wakeup(hcd->self.controller, true);
+                               fsl_usb_lowpower_mode(pdata, true);
+                               fsl_usb_clk_gate(hcd->self.controller->platform_data, false);
                        }
-#endif
-                       fsl_usb_lowpower_mode(pdata, true);
-                       fsl_usb_clk_gate(hcd->self.controller->platform_data, false);
                }
                enable_irq(hcd->irq);
                return 0;