/** @file
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This file contains the device definition of the System Agent
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ACPI reference code.
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Currently defines the device objects for the
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System Agent IPU device
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Copyright (c) 2019 Intel Corporation. All rights reserved. <BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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//
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// Device IPUA is the IPU AVStream virtual device and it appears under GFX0
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//
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Scope (\_SB.PCI0.GFX0)
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{
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Device(IPUA) // IPU AVStream virtual device name
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{
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/*
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The identifier for this device (Same as in
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_DOD above). This is required so GFX driver can
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associate a matching device ID for the AVStream
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driver and provide it to PnP (this device ID
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should appear in the INF file of the AVStream
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driver).
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*/
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Name(_ADR, 0x00003480)
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/*
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The following is a technique that may be used (per OEM needs) to prevent
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the load of the camera device in one of the following cases:
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- Camera device is fused out
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- If the platform setup requires that in a secured boot the camera device
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should not be enabled
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*/
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Method (_STA, 0, NotSerialized) {
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If(LEqual(IPTP,1)){ // IGFX need report IPU AVStream virtual device as GFX0 child
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Return (0xF)
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} Else { // IGFX should NOT report IPU AVStream virtual device as GFX0 child
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Return (0x0)
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}
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}
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} // End SKC0
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} // end I.G.D
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Scope(\_SB.PCI0.IPU0)
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{
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//----------------------------------------------------------------------------------------
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// Intel Proprietary Passing LTR information from BIOS to IPU Driver. DSM Method
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//
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// Method(_DSM, 0x4, Serialized, 0, {IntObj, BuffObj}, {BuffObj, IntObj, IntObj, PkgObj})
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// Arguments:
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// Arg0: GUID: "9A9E6AB4-E3FC-475D-AD1C-C4789E4CFE90"
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// Arg1: Integer Revision Level (Current revision is 0)
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// Arg2: Integer Function Index
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// 0x1 - return UINT 32bit LTR values
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// 0x2 - return UINT 32bit Fill Time
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//
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//-----------------------------------------------------------------------------------------
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Method (_DSM, 4, NotSerialized) { // _DSM: Device-Specific Method
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If (LEqual(Arg0, ToUUID("9A9E6AB4-E3FC-475D-AD1C-C4789E4CFE90")))
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{
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// Function 0 : Query Function
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If (LEqual(Arg2, 0))
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{
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// Revision 0
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If (LEqual(Arg1, 0)) // The current revision is 0
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{
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Return(Buffer() { 0x07 }) // There are 2 function defined other than Query.
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} Else {
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Return(0) // Revision mismatch
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}
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}
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// Function 1 : Return UINT 32bit LTR values
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If(LEqual(Arg2, 1))
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{
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Return(0x64503C19)
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}
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// Function 2 : Return UINT 32bit Fill Time
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If(LEqual(Arg2, 2))
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{
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Return(0xFFF0783C)
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}
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}
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Return(0) // Function number or GUID mismatch but normal return.
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}
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}
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