Am Freitag, 16. Februar 2018, 13:09:53 CET schrieb Enric Balletbo i Serra: > From: William wu <wulf@xxxxxxxxxxxxxx> > > We have forced usb3 to work in usb2 only mode in firmware by setting > usb3tousb2_en (bit3 of GRF_USB3PHY0/1_CON0) to 1, and setting > host_u3_port_disable (bit0 of GRF_USB3OTG0/1_CON1) to 1 and host_u3_port > (bit15~12 of GRF_USB3OTG0/1_CON1) to 0. So we need to re-enable usb3 > host. > > Note that the RK3399 TRM suggests that we should keep the whole usb3 > controller in reset for the duration of the Type-C PHY initialization. > However, it's hard to assert the reset in the current framework of > reset. And according to the TRM, it doesn't require that we should > clear the usb3tousb2 bit before pipe ready. So let's enable the usb3 > host after pipe ready to avoid the Type-C PHY initialization failure. > > Signed-off-by: William wu <wulf@xxxxxxxxxxxxxx> > Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx> Reviewed-by: Heiko Stuebner <heiko@xxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
