[coreboot-gerrit] Change in coreboot[master]: drivers/gfx: Add generic graphics with SSDT generator

[Mathew King (Code Review)]

Hello Rajat Jain, Duncan Laurie, build bot (Jenkins), Patrick Georgi, Martin Roth,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/36041

to look at the new patch set (#7).

Change subject: drivers/gfx: Add generic graphics with SSDT generator
......................................................................

drivers/gfx: Add generic graphics with SSDT generator

This change 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 
---
A src/drivers/generic/gfx/Kconfig
A src/drivers/generic/gfx/Makefile.inc
A src/drivers/generic/gfx/chip.h
A src/drivers/generic/gfx/gfx.c
4 files changed, 172 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/41/36041/7