From f1395d825be59663913f88ddaf01cbfa6c46afa7 Mon Sep 17 00:00:00 2001 From: Nicola Corna Date: Sat, 5 Nov 2016 16:06:59 +0100 Subject: ec/lenovo/h8: Add USB Always On USB AO is the internal name for the dedicated charging port on ThinkPads when in S3 or lower. AOEN (bit 0) is internal name for enabling this feature while AOCF (bits 2 and 3) is the configuration field. According to Peter Stuge, AOCF can be configured in this way: 00 => AC S3 S4 S4 USB on, battery S3 USB on, battery S4 S5 off 11 => AC S3 S4 S4 USB on, battery S3 S4 S5 USB off 10, 01 => equivalent to 00 This commit also adds a new configuration field in the CMOS of the X220 and the X201 to activate this feature. It probably can be also added to all the ThinkPads that support this functionality. With this functionality USB devices are able to negotiate full power from the dedicated port (usually the yellow one) even in S3. Tested on a X201 and X220 with an Android smartphone: with this feature enabled it shows "Charging" when connected during S3, without it it shows "Charging slowly" (or it doesn't charge at all on the X201). For some reasons the "AC only" mode doesn't work, so it has been disabled. Change-Id: Ie1269a4357e2fbd608ad8b7b8262275914730f6e Signed-off-by: Nicola Corna Reviewed-on: https://review.coreboot.org/17252 Tested-by: build bot (Jenkins) Reviewed-by: Nico Huber --- src/ec/lenovo/h8/smm.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 src/ec/lenovo/h8/smm.c (limited to 'src/ec/lenovo/h8/smm.c') diff --git a/src/ec/lenovo/h8/smm.c b/src/ec/lenovo/h8/smm.c new file mode 100644 index 0000000000..31009a6926 --- /dev/null +++ b/src/ec/lenovo/h8/smm.c @@ -0,0 +1,35 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2016 Nicola Corna + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include + +#include "h8.h" + +void h8_usb_always_on(void) +{ + u8 val; + u8 reg; + + if (get_option(&val, "usb_always_on") != CB_SUCCESS) + val = 0; + + if (val) { + reg = ec_read(H8_USB_ALWAYS_ON); + reg &= ~H8_USB_ALWAYS_ON_AC_ONLY; + reg |= H8_USB_ALWAYS_ON_ENABLE; + ec_write(H8_USB_ALWAYS_ON, reg); + } +} -- cgit v1.2.3