a90aebbf2a
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>
38 lines
1.0 KiB
Plaintext
38 lines
1.0 KiB
Plaintext
/* SPDX-License-Identifier: GPL-2.0-only */
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External(\_SB.DDEF, MethodObj)
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External(\_SB.DTHL, MethodObj)
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External(\_SB.DTAB, MethodObj)
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Scope (\_SB)
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{
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Method (DPTC, 0, Serialized)
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{
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/* If _SB.DDEF is not present, DPTC is not enabled so return early. */
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If (!CondRefOf (\_SB.DDEF))
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{
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Return (Zero)
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}
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/* If _SB.DTHL is not present, then DPTC Tablet Mode is not enabled.
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* Throttle the SOC if the battery is not present (BTEX), the battery level is critical
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* (BFCR), or the battery is cutoff (BFCT). */
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If (CondRefOf (\_SB.DTHL) &&
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(!\_SB.PCI0.LPCB.EC0.BTEX || \_SB.PCI0.LPCB.EC0.BFCR || \_SB.PCI0.LPCB.EC0.BFCT))
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{
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\_SB.DTHL()
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Return (Zero)
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}
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/* If _SB.DTAB is not present, then DPTC Tablet Mode is not enabled. */
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If (CondRefOf (\_SB.DTAB) && (\_SB.PCI0.LPCB.EC0.TBMD == One))
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{
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\_SB.DTAB()
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Return (Zero)
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}
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\_SB.DDEF()
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Return (Zero)
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}
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}
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