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Re-write the UAO handling code as it had stopped working (#171)
(the flag was not getting read from the RTC properly in SMM)
Remove the SMM code as it's not needed (but EC flag won't be set
upon entering S3 now)
Set the EC flags on boot the same way other flags are set
Document bitwise operators for clarity
Propagate changes to other Thinkpads
(updated X201 to have 2 bits for the flag as it only had 1)
Per Nicola Corna's previous commits, 0x0d is set for "AC only"
"AC only" does exhibit different behaviour - the USB port is
turned on a few seconds after entering S3, rather than < 1 sec,
regardless of AC status
Tested on X220
Change-Id: If812cd1ef8fb1a24d7fadbe834f574b40cbcd56a
Signed-off-by: Nathaniel Roach <nroach44@gmail.com>
Reviewed-on: https://review.coreboot.org/c/29565
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
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Add support for UAO AC only mode.
Needs tests on all platforms.
Change-Id: Ib52aab427ff687b00129024cde65b78060d21e32
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/20450
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
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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 <nicola@corna.info>
Reviewed-on: https://review.coreboot.org/17252
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>
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