4550eecbf7
Changes:
- Fix cameras not showing up (@djrscally)
- PR: https://github.com/linux-surface/kernel/pull/122
- Rebase onto v5.17.5
Links:
- kernel: 58e00c7367
59 lines
2 KiB
Diff
59 lines
2 KiB
Diff
From 1da1dd4313e7bf02c629804916e4219e177d4f5c Mon Sep 17 00:00:00 2001
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From: Maximilian Luz <luzmaximilian@gmail.com>
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Date: Tue, 8 Feb 2022 01:29:48 +0100
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Subject: [PATCH] ACPI: battery: Add "Not Charging" quirk for Microsoft Surface
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devices
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Microsoft Surface devices have a limiter that sets a fixed maximum
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charge capacity for the battery. When that maximum capacity has been
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reached, charging stops. In that case, _BST returns a battery state
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field with both "charging" and "discharging" bits cleared. The battery
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driver, however, returns "unknown" as status.
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This seems to be the same behavior as observed on the ThinkPads, so
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let's use the same quirk to handle that as well.
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Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
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Patchset: surface-battery
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---
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For what it's worth, I don't think the ACPI spec explicitly states that
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any of the status bits need to be set, or that there are only the
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"charging" and "discharging" states. As far as I can tell, ACPI only
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states:
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Notice that the Charging bit and the Discharging bit are mutually
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exclusive and must not both be set at the same time. Even in
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critical state, hardware should report the corresponding
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charging/discharging state.
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But that does not exclude the case that no bit is set. So, strictly
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going by spec, I don't think it's necessary to put all of this behind a
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quirk.
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---
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drivers/acpi/battery.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
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index dc208f5f5a1f..db2aa56c746a 100644
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--- a/drivers/acpi/battery.c
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+++ b/drivers/acpi/battery.c
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@@ -1152,6 +1152,14 @@ static const struct dmi_system_id bat_dmi_table[] __initconst = {
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DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad"),
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},
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},
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+ {
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+ .callback = battery_quirk_not_charging,
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+ .ident = "Microsoft Surface",
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+ .matches = {
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+ DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
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+ DMI_MATCH(DMI_PRODUCT_NAME, "Surface"),
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+ },
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+ },
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{
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/* Microsoft Surface Go 3 */
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.callback = battery_notification_delay_quirk,
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--
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2.36.0
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