RE: [PATCH] usb: host: xhci-rcar: Avoid long wait in xhci_reset()

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Hi Felipe,

> From: Felipe Balbi
> Sent: Thursday, April 21, 2016 7:05 PM
> 
> Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> writes:
> 
> > If kernel configuration is CONFIG_USB_XHCI_PLATFORM=y and
> > CONFIG_USB_XHCI_RCAR is not set, R-Car Gen2/3 will cause long wait
> > in xhci_reset() because such SoCs need specific initialization.
> 
> where is the delay coming from exactly ?

The delay is coming from the following code:

	ret = xhci_handshake(&xhci->op_regs->command,
			CMD_RESET, 0, 10 * 1000 * 1000);
	if (ret)
		return ret;

And, kernel log is the following:

[    1.565605] xhci-hcd ee000000.usb: xHCI Host Controller
[    1.570636] xhci-hcd ee000000.usb: new USB bus registered, assigned bus number 5
[   22.270160] xhci-hcd ee000000.usb: can't setup: -110
[   22.274931] xhci-hcd ee000000.usb: USB bus 5 deregistered
[   22.280158] xhci-hcd: probe of ee000000.usb failed with error -110

The timestamp is strange to me. But, logs of R-Car H3 (ES1.0) and R-Car H2 were the same.

Should I revise the commit log in detail?

Best regards,
Yoshihiro Shimoda

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