Am Montag, den 05.01.2015, 10:12 -0200 schrieb Fabio Estevam: > Hi Lucas, > > On Mon, Jan 5, 2015 at 9:02 AM, Lucas Stach <l.stach@xxxxxxxxxxxxxx> wrote: > > Some controllers need to have external power supplied before toggling > > the internal PORT_POWER bit. > > > > Fixes: 11a7e5940514 (usb: ehci: add ehci_port_power interface) on i.MX51 > > where the controller would hang the machine when trying to enable PORT_POWER. > > I tested your patch and the hang does not happen anymore, but the USB > host port on my imx51-babbage is no longer functional: attaching a USB > thumb on the host port is not detected. > > If I apply the following patch then I am able to get USB host port > functional again: > http://lists.infradead.org/pipermail/linux-arm-kernel/2014-December/310705.html Urgh, I looked at this again and it's a complete mess. According to the schematics I have the "reg_usbh1_vbus" isn't a regulator, but a ULPI PHY reset GPIO. So the devicetree description is completely wrong here. Sorry to say, but git blame points to you. Marking the regulator as always-on may fix it for you, but that doesn't guarantee proper reset of the PHY if the bootloader already set it up. This really needs a separate PHY reset GPIO property to fix it properly, same thing as is done tegra20-usb-phy. Regards, Lucas -- Pengutronix e.K. | Lucas Stach | Industrial Linux Solutions | http://www.pengutronix.de/ | -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
