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| author | Hans de Goede <hdegoede@redhat.com> | 2024-04-06 16:56:25 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2024-04-08 17:50:47 +0300 |
| commit | d8f20383a2fc3a3844b08a4999cf0e81164a0e56 (patch) | |
| tree | 9e87fe57c253fa30d487e265919279c628e5db86 /arch/x86/include | |
| parent | bfd1a492b56082034cdf560d66c26b3b636fad18 (diff) | |
| download | linux-d8f20383a2fc3a3844b08a4999cf0e81164a0e56.tar.xz | |
ACPI: x86: Add PNP_UART1_SKIP quirk for Lenovo Blade2 tablets
The x86 Android tablets on which quirks to skip looking for a matching
UartSerialBus resource and instead unconditionally create a serial bus
device (serdev) are necessary there are 2 sorts of serialports:
ACPI enumerated highspeed designware UARTs, these are the ones which
typcially need to be skipped since they need a serdev for the attached
BT HCI.
A PNP enumerated UART which is part of the PCU. So far the existing
quirks have ignored this. But on the Lenovo Yoga Tablet 2 Pro 1380
models this is used for a custom fastcharging protocol. There is
a Micro USB switch which can switch the USB data lines to this uart
and then a 600 baud protocol is used to configure the charger for
a voltage higher then 5V.
Add a new ACPI_QUIRK_PNP_UART1_SKIP quirk type and set this for
the existing entry for the Lenovo Yoga Tablet 2 830 / 1050 models.
Note this will lead to unnecessarily also creating a serdev for
the PCU UART on the 830 / 1050 which don't need this, but the UART
is not used otherwise there so that is not a problem.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'arch/x86/include')
0 files changed, 0 insertions, 0 deletions