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/*++
Copyright (c) 1999 - 2014, Intel Corporation. All rights reserved
SPDX-License-Identifier: BSD-2-Clause-Patent
Module Name:
IgdOGBDA.ASL
Abstract:
IGD OpRegion/Software SCI Reference Code for the Baytrail Family.
This file contains Get BIOS Data Area funciton support for
the Integrated Graphics Device (IGD) OpRegion/Software SCI mechanism.
--*/
Method (GBDA, 0, Serialized)
{
// Supported calls: Sub-function 0
If (LEqual(GESF, 0))
{
//<TODO> Update implementation specific supported calls. Reference
// code is set to Intel's validated implementation.
Store(0x0000279, PARM)
Store(Zero, GESF) // Clear the exit parameter
Return(SUCC) // Success
}
// Requested callbacks: Sub-function 1
If (LEqual(GESF, 1))
{
//<TODO> Update implementation specific system BIOS requested call
// back functions. Call back functions are where the driver calls the
// system BIOS at function indicated event.
Store(0x00000240, PARM)
Store(Zero, GESF) // Clear the exit parameter
Return(SUCC) // Success
}
// Get Boot display Preferences: Sub-function 4
If (LEqual(GESF, 4))
{
//<TODO> Update the implementation specific Get Boot Display
// Preferences function.
And(PARM, 0xEFFF0000, PARM) // PARM[30:16] = Boot device ports
And(PARM, ShiftLeft(DeRefOf(Index(DBTB, IBTT)), 16), PARM)
Or(IBTT, PARM, PARM) // PARM[7:0] = Boot device type
Store(Zero, GESF) // Clear the exit parameter
Return(SUCC) // Success
}
// Panel details: Sub-function 5
If (LEqual(GESF, 5))
{
//<TODO> Update the implementation specific Get Panel Details
// function.
Store(IPSC, PARM) // Report the scaling setting
Or(PARM, ShiftLeft(IPAT, 8), PARM)
Add(PARM, 0x100, PARM) // Adjust panel type, 0 = VBT default
Or(PARM, ShiftLeft(LIDS, 16), PARM) // Report the lid state
Add(PARM, 0x10000, PARM) // Adjust the lid state, 0 = Unknown
Or(PARM, ShiftLeft(IBLC, 18), PARM) // Report the BLC setting
Or(PARM, ShiftLeft(IBIA, 20), PARM) // Report the BIA setting
Store(Zero, GESF)
Return(SUCC)
}
// TV-standard/Video-connector: Sub-function 6
If (LEqual(GESF, 6))
{
//<TODO> Update the implementation specific Get
// TV-standard/Video-connectorPanel function.
Store(ITVF, PARM)
Or(PARM, ShiftLeft(ITVM, 4), PARM)
Store(Zero, GESF)
Return(SUCC)
}
// Internal graphics: Sub-function 7
If (LEqual(GESF, 7))
{
Store(GIVD, PARM) // PARM[0] - VGA mode(1=VGA)
Xor(PARM, 1, PARM) // Invert the VGA mode polarity
Or(PARM, ShiftLeft(GMFN, 1), PARM) // PARM[1] - # IGD PCI functions-1
// PARM[3:2] - Reserved
// PARM[4] - IGD D3 support(0=cold)
// PARM[10:5] - Reserved
Or(PARM, ShiftLeft(3, 11), PARM) // PARM[12:11] - DVMT mode(11b = 5.0)
//
// Report DVMT 5.0 Total Graphics memory size.
//
Or(PARM, ShiftLeft(IDMS, 17), PARM) // Bits 20:17 are for Gfx total memory size
// If the "Set Internal Graphics" call is supported, the modified
// settings flag must be programmed per the specification. This means
// that the flag must be set to indicate that system BIOS requests
// these settings. Once "Set Internal Graphics" is called, the
// modified settings flag must be cleared on all subsequent calls to
// this function.
// Report the graphics frequency based on DISPLAY_CLOCK_FREQUENCY_ENCODING [MMADR+0x20C8]
Or(ShiftLeft(Derefof(Index(CDCT, \_SB.PCI0.GFX0.MCHK.DCFE)), 21),PARM, PARM)
Store(1, GESF) // Set the modified settings flag
Return(SUCC)
}
// Spread spectrum clocks: Sub-function 10
If (LEqual(GESF, 10))
{
Store(0, PARM) // Assume SSC is disabled
If(ISSC)
{
Or(PARM, 3, PARM) // If SSC enabled, return SSC1+Enabled
}
Store(0, GESF) // Set the modified settings flag
Return(SUCC) // Success
}
// A call to a reserved "Get BIOS data" function was received.
Store(Zero, GESF) // Clear the exit parameter
Return(CRIT) // Reserved, "Critical failure"
}
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