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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>
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1 changed files with 13 additions and 7 deletions
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@ -269,9 +269,10 @@ bool force_storage_d3(void)
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#define ACPI_QUIRK_SKIP_I2C_CLIENTS BIT(0)
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#define ACPI_QUIRK_UART1_SKIP BIT(1)
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#define ACPI_QUIRK_UART1_TTY_UART2_SKIP BIT(2)
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#define ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY BIT(3)
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#define ACPI_QUIRK_USE_ACPI_AC_AND_BATTERY BIT(4)
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#define ACPI_QUIRK_SKIP_GPIO_EVENT_HANDLERS BIT(5)
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#define ACPI_QUIRK_PNP_UART1_SKIP BIT(3)
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#define ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY BIT(4)
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#define ACPI_QUIRK_USE_ACPI_AC_AND_BATTERY BIT(5)
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#define ACPI_QUIRK_SKIP_GPIO_EVENT_HANDLERS BIT(6)
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static const struct dmi_system_id acpi_quirk_skip_dmi_ids[] = {
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/*
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@ -351,6 +352,7 @@ static const struct dmi_system_id acpi_quirk_skip_dmi_ids[] = {
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DMI_MATCH(DMI_BIOS_VERSION, "BLADE_21"),
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},
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.driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
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ACPI_QUIRK_PNP_UART1_SKIP |
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ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY),
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},
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{
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@ -449,14 +451,18 @@ static int acpi_dmi_skip_serdev_enumeration(struct device *controller_parent, bo
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if (ret)
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return 0;
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/* to not match on PNP enumerated debug UARTs */
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if (!dev_is_platform(controller_parent))
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return 0;
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dmi_id = dmi_first_match(acpi_quirk_skip_dmi_ids);
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if (dmi_id)
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quirks = (unsigned long)dmi_id->driver_data;
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if (!dev_is_platform(controller_parent)) {
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/* PNP enumerated UARTs */
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if ((quirks & ACPI_QUIRK_PNP_UART1_SKIP) && uid == 1)
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*skip = true;
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return 0;
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}
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if ((quirks & ACPI_QUIRK_UART1_SKIP) && uid == 1)
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*skip = true;
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