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Adds a generic graphics driver that can be added to a devicetree which
populates graphics-related ACPI table. It will write the _DOD method
(Enumerate All Devices Attached to the Display Adapter) and a device
object for each device defined. The device may optionally have a
connected privacy screen which can be controlled with a _DSM.
Example:
chip drivers/generic/gfx
register "device_count" = "1"
register "device[0].name" = ""LCD""
register "device[0].addr" = "0x0400"
register "device[0].privacy.enabled" = "1"
register "device[0].privacy.detect_function" = ""\\_SB.PCI0.PVSC.GPVD""
register "device[0].privacy.status_function" = ""\\_SB.PCI0.PVSC.GPVX""
register "device[0].privacy.enable_function" = ""\\_SB.PCI0.PVSC.EPVX""
register "device[0].privacy.disable_function" = ""\\_SB.PCI0.PVSC.DPVX""
device generic 0 on end
end
ASL
Scope (\_SB.PCI0.GFX0)
{
Method (_DOD, 0, NotSerialized) // _DOD: Display Output Devices
{
Return (Package (0x01)
{
0x00000400
})
}
Device (LCD)
{
Name (_ADR, 0x0400) // _ADR: Address
Name (_STA, 0x0F) // _STA: Status
Method (_DSM, 4, Serialized) // _DSM: Device-Specific Method
{
ToBuffer (Arg0, Local0)
If ((Local0 == ToUUID ("c7033113-8720-4ceb-9090-9d52b3e52d73")))
{
ToInteger (Arg2, Local1)
If ((Local1 == Zero))
{
Local2 = \_SB.PCI0.PVSC.GPVD ()
If ((Local2 == One))
{
Return (Buffer (One)
{
0x0F
})
}
}
If ((Local1 == One))
{
ToBuffer (\_SB.PCI0.PVSC.GPVX (), Local2)
Return (Local2)
}
If ((Local1 == 0x02))
{
\_SB.PCI0.PVSC.EPVX ()
}
If ((Local1 == 0x03))
{
\_SB.PCI0.PVSC.DPVX ()
}
Return (Buffer (One)
{
0x00
})
}
Return (Buffer (One)
{
0x00
})
}
}
}
BUG=b:142237145
TEST=Added gfx to devicetree on sarien_cml and correct ASL in SSDT
Change-Id: Ida520dd7aad81ee7c1e5f2d0d3f5cc1a766d78a0
Signed-off-by: Mathew King <mathewk@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36041
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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