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Some Surface Book 2 and 3 models have a discrete GPU (dGPU) that is hot-pluggable. On those devices, the dGPU is contained in the base, which can be separated from the tablet part (containing CPU and touchscreen) while the device is running. It (in general) is presented as/behaves like a standard PCIe hot-plug capable device, however, this device can also be put into D3cold. In D3cold, the device itself is turned off and can thus not submit any standard PCIe hot-plug events. To properly detect hot-(un)plugging while the dGPU is in D3cold, out-of-band signaling is required. Without this, the device state will only get updated during the next bus-check, eg. via a manually issued lspci call. This commit adds a driver to handle out-of-band PCIe hot-(un)plug events on Microsoft Surface devices. On those devices, said events can be detected via GPIO interrupts, which are then forwarded to the corresponding ACPI DSM calls by this driver. The DSM then takes care of issuing the appropriate bus-/device-check, causing the PCI core to properly pick up the device change. Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com> Link: https://lore.kernel.org/r/20210205012657.1951753-1-luzmaximilian@gmail.com Signed-off-by: Hans de Goede <hdegoede@redhat.com>
117 lines
4.2 KiB
Plaintext
117 lines
4.2 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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#
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# Microsoft Surface Platform-Specific Drivers
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#
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menuconfig SURFACE_PLATFORMS
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bool "Microsoft Surface Platform-Specific Device Drivers"
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depends on ACPI
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default y
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help
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Say Y here to get to see options for platform-specific device drivers
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for Microsoft Surface devices. This option alone does not add any
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kernel code.
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If you say N, all options in this submenu will be skipped and disabled.
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if SURFACE_PLATFORMS
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config SURFACE3_WMI
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tristate "Surface 3 WMI Driver"
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depends on ACPI_WMI
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depends on DMI
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depends on INPUT
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depends on SPI
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help
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Say Y here if you have a Surface 3.
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To compile this driver as a module, choose M here: the module will
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be called surface3-wmi.
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config SURFACE_3_BUTTON
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tristate "Power/home/volume buttons driver for Microsoft Surface 3 tablet"
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depends on KEYBOARD_GPIO && I2C
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help
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This driver handles the power/home/volume buttons on the Microsoft Surface 3 tablet.
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config SURFACE_3_POWER_OPREGION
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tristate "Surface 3 battery platform operation region support"
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depends on I2C
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help
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This driver provides support for ACPI operation
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region of the Surface 3 battery platform driver.
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config SURFACE_ACPI_NOTIFY
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tristate "Surface ACPI Notify Driver"
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depends on SURFACE_AGGREGATOR
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help
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Surface ACPI Notify (SAN) driver for Microsoft Surface devices.
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This driver provides support for the ACPI interface (called SAN) of
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the Surface System Aggregator Module (SSAM) EC. This interface is used
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on 5th- and 6th-generation Microsoft Surface devices (including
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Surface Pro 5 and 6, Surface Book 2, Surface Laptops 1 and 2, and in
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reduced functionality on the Surface Laptop 3) to execute SSAM
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requests directly from ACPI code, as well as receive SSAM events and
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turn them into ACPI notifications. It essentially acts as a
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translation layer between the SSAM controller and ACPI.
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Specifically, this driver may be needed for battery status reporting,
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thermal sensor access, and real-time clock information, depending on
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the Surface device in question.
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config SURFACE_AGGREGATOR_CDEV
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tristate "Surface System Aggregator Module User-Space Interface"
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depends on SURFACE_AGGREGATOR
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help
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Provides a misc-device interface to the Surface System Aggregator
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Module (SSAM) controller.
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This option provides a module (called surface_aggregator_cdev), that,
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when loaded, will add a client device (and its respective driver) to
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the SSAM controller. Said client device manages a misc-device
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interface (/dev/surface/aggregator), which can be used by user-space
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tools to directly communicate with the SSAM EC by sending requests and
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receiving the corresponding responses.
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The provided interface is intended for debugging and development only,
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and should not be used otherwise.
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config SURFACE_GPE
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tristate "Surface GPE/Lid Support Driver"
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depends on DMI
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help
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This driver marks the GPEs related to the ACPI lid device found on
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Microsoft Surface devices as wakeup sources and prepares them
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accordingly. It is required on those devices to allow wake-ups from
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suspend by opening the lid.
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config SURFACE_HOTPLUG
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tristate "Surface Hot-Plug Driver"
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depends on GPIOLIB
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help
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Driver for out-of-band hot-plug event signaling on Microsoft Surface
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devices with hot-pluggable PCIe cards.
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This driver is used on Surface Book (2 and 3) devices with a
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hot-pluggable discrete GPU (dGPU). When not in use, the dGPU on those
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devices can enter D3cold, which prevents in-band (standard) PCIe
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hot-plug signaling. Thus, without this driver, detaching the base
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containing the dGPU will not correctly update the state of the
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corresponding PCIe device if it is in D3cold. This driver adds support
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for out-of-band hot-plug notifications, ensuring that the device state
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is properly updated even when the device in question is in D3cold.
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Select M or Y here, if you want to (fully) support hot-plugging of
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dGPU devices on the Surface Book 2 and/or 3 during D3cold.
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config SURFACE_PRO3_BUTTON
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tristate "Power/home/volume buttons driver for Microsoft Surface Pro 3/4 tablet"
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depends on INPUT
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help
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This driver handles the power/home/volume buttons on the Microsoft Surface Pro 3/4 tablet.
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source "drivers/platform/surface/aggregator/Kconfig"
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endif # SURFACE_PLATFORMS
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