diff options
| author | Tim Van Patten <timvp@google.com> | 2022-08-16 12:09:23 -0600 |
|---|---|---|
| committer | Martin L Roth <gaumless@gmail.com> | 2022-09-19 09:53:17 +0000 |
| commit | a90aebbf2a471b901bd1aa40e12e4f6a021b8ecc (patch) | |
| tree | bc89fd3e4af2ac4b9c2ec2a0eba6892268e8c2c1 /src/soc/amd/common/acpi | |
| parent | 2d9e96a5ab175e126929e8d2314227cdd441857f (diff) | |
soc/amd/acpi: Add low/no battery mode to DPTC
Update acpigen_write_alib_dptc() to support "low/no battery mode",
which throttles the SOC when there is no battery connected or the
battery charge is critically low.
This is in preparation for enabling this functionality for Mendocino.
BUG=b:217911928
TEST=Build zork
TEST=Boot nipperkin
TEST=Boot skyrim
Signed-off-by: Tim Van Patten <timvp@google.com>
Change-Id: Icea10a3876a29744ad8485be1557e184bcbfa397
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66804
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/soc/amd/common/acpi')
| -rw-r--r-- | src/soc/amd/common/acpi/dptc.asl | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/soc/amd/common/acpi/dptc.asl b/src/soc/amd/common/acpi/dptc.asl index 611024cb02..e97aade50c 100644 --- a/src/soc/amd/common/acpi/dptc.asl +++ b/src/soc/amd/common/acpi/dptc.asl @@ -1,6 +1,7 @@ /* SPDX-License-Identifier: GPL-2.0-only */ External(\_SB.DDEF, MethodObj) +External(\_SB.DTHL, MethodObj) External(\_SB.DTAB, MethodObj) Scope (\_SB) @@ -13,6 +14,17 @@ Scope (\_SB) Return (Zero) } + /* If _SB.DTHL is not present, then DPTC Tablet Mode is not enabled. + * Throttle the SOC if the battery is not present (BTEX), the battery level is critical + * (BFCR), or the battery is cutoff (BFCT). */ + If (CondRefOf (\_SB.DTHL) && + (!\_SB.PCI0.LPCB.EC0.BTEX || \_SB.PCI0.LPCB.EC0.BFCR || \_SB.PCI0.LPCB.EC0.BFCT)) + { + \_SB.DTHL() + Return (Zero) + } + + /* If _SB.DTAB is not present, then DPTC Tablet Mode is not enabled. */ If (CondRefOf (\_SB.DTAB) && (\_SB.PCI0.LPCB.EC0.TBMD == One)) { \_SB.DTAB() |