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drivers/intel/gma/acpi: Reduce display switching stubs 

_DCS, _DGS and _DSS are required by specification. However,
we never implemented them properly, and no OS driver com-
plained yet. So we stub them out and keep the traditional
behavior in case an OS driver checks for their existence.

The old implementations also only returned static values as
there never was any write to their GNVS variables. The TRAP()
that was called in one place is actually implemented by some
ThinkPad's SMI handler as docking event. However, as the call
precedes these SMI handlers in coreboot history, it's most
likely an accident.

Change-Id: Ib0b9fcdd58df254d3b2290900e3bc206a7abd92d
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39726
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
This commit is contained in:
Nico Huber 2020-03-21 18:40:03 +01:00 committed by Patrick Georgi
parent cc85ce0aa0
commit e98f6af77b
15 changed files with 28 additions and 99 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
src/drivers/intel/gma/acpi.c
View File

@ -102,39 +102,38 @@ drivers_intel_gma_displays_ssdt_generate(const struct i915_gpu_controller_info *
}
/*
Method(_DCS, 0)
{
Return (^^XDCS(<device number>))
}
* _DCS, _DGS and _DSS are required by specification. However,
* we never implemented them properly, and no OS driver com-
* plained yet. So we stub them out and keep the traditional
* behavior in case an OS driver checks for their existence.
*/
/*
Method(_DCS, 0)
{
Return (0x1d)
}
*/
acpigen_write_method("_DCS", 0);
acpigen_emit_byte(0xa4); /* ReturnOp. */
acpigen_emit_namestring("^^XDCS");
acpigen_write_byte(i);
acpigen_write_return_integer(0x1d);
acpigen_pop_len();
/*
Method(_DGS, 0)
{
Return (^^XDGS(<device number>))
}
Method(_DGS, 0)
{
Return (0)
}
*/
acpigen_write_method("_DGS", 0);
acpigen_emit_byte(0xa4); /* ReturnOp. */
acpigen_emit_namestring("^^XDGS");
acpigen_write_byte(i);
acpigen_write_return_integer(0);
acpigen_pop_len();
/*
Method(_DSS, 1)
{
^^XDSS(0x5a, Arg0)
}
Method(_DSS, 1)
{
}
*/
acpigen_write_method("_DSS", 1);
acpigen_emit_namestring("^^XDSS");
acpigen_write_byte(i);
acpigen_emit_byte(0x68); /* Arg0Op. */
acpigen_pop_len();
acpigen_pop_len();

35
src/drivers/intel/gma/acpi/common.asl
View File

@ -35,11 +35,6 @@
/* Display Output Switching */
Method (_DOS, 1)
{
/* Windows 2000 and Windows XP call _DOS to enable/disable
* Display Output Switching during init and while a switch
* is already active
*/
Store (And(Arg0, 7), DSEN)
}
/*
@ -80,33 +75,3 @@
XBCM (DerefOf (Index (BRIG, Local0)))
}
}
/* Device Current Status */
Method(XDCS, 1)
{
TRAP(1)
If (And(CSTE, ShiftLeft (1, Arg0))) {
Return (0x1f)
}
Return(0x1d)
}
/* Query Device Graphics State */
Method(XDGS, 1)
{
If (And(NSTE, ShiftLeft (1, Arg0))) {
Return(1)
}
Return(0)
}
/* Device Set State */
Method(XDSS, 1)
{
/* If Parameter Arg0 is (1 << 31) | (1 << 30), the
* display switch was completed
*/
If (LEqual(And(Arg0, 0xc0000000), 0xc0000000)) {
Store (NSTE, CSTE)
}
}

2
src/mainboard/51nb/x210/dsdt.asl
View File

@ -12,8 +12,6 @@ DefinitionBlock(
0x20110725 // OEM revision
)
{
Name(\DSEN, 1)
#include "acpi/platform.asl"
#include <soc/intel/skylake/acpi/globalnvs.asl>

4
src/southbridge/intel/bd82x6x/acpi/globalnvs.asl
View File

@ -16,7 +16,6 @@
/* Global Variables */
Name(\PICM, 0) // IOAPIC/8259
Name(\DSEN, 1) // Display Output Switching Enable
/* Global ACPI memory region. This region is used for passing information
* between coreboot (aka "the system bios"), ACPI, and the SMI handler.
@ -89,9 +88,6 @@ Field (GNVS, ByteAcc, NoLock, Preserve)
TLST, 8, // 0x3d - Display Toggle List pointer
CADL, 8, // 0x3e - Currently Attached Devices List
PADL, 8, // 0x3f - Previously Attached Devices List
CSTE, 16, // 0x40 - Current display state
NSTE, 16, // 0x42 - Next display state
SSTE, 16, // 0x44 - Set display state
Offset (0x46),
NDID, 8, // 0x46 - Number of Device IDs
DID1, 32, // 0x47 - Device ID 1

4
src/southbridge/intel/bd82x6x/nvs.h
View File

@ -75,9 +75,7 @@ typedef struct global_nvs_t {
u8 tlst; /* 0x3d - Display Toggle List Pointer */
u8 cadl; /* 0x3e - currently attached devices */
u8 padl; /* 0x3f - previously attached devices */
u16 cste; /* 0x40 - current display state */
u16 nste; /* 0x42 - next display state */
u16 sste; /* 0x44 - set display state */
u16 rsvd14[3];
u8 ndid; /* 0x46 - number of device ids */
u32 did[5]; /* 0x47 - 5b device id 1..5 */
u8 rsvd5[0x9];

4
src/southbridge/intel/i82801dx/nvs.h
View File

@ -69,9 +69,7 @@ typedef struct {
u8 tlst; /* 0x3d - Display Toggle List Pointer */
u8 cadl; /* 0x3e - currently attached devices */
u8 padl; /* 0x3f - previously attached devices */
u16 cste; /* 0x40 - current display state */
u16 nste; /* 0x42 - next display state */
u16 sste; /* 0x44 - set display state */
u16 rsvd14[3];
u8 ndid; /* 0x46 - number of device ids */
u32 did[5]; /* 0x47 - 5b device id 1..5 */
u8 rsvd5[0x9];

5
src/southbridge/intel/i82801gx/acpi/globalnvs.asl
View File

@ -16,7 +16,6 @@
/* Global Variables */
Name(\PICM, 0) // IOAPIC/8259
Name(\DSEN, 1) // Display Output Switching Enable
/* Global ACPI memory region. This region is used for passing information
* between coreboot (aka "the system bios"), ACPI, and the SMI handler.
@ -88,9 +87,7 @@ Field (GNVS, ByteAcc, NoLock, Preserve)
TLST, 8, // 0x3d - Display Toggle List pointer
CADL, 8, // 0x3e - Currently Attached Devices List
PADL, 8, // 0x3f - Previously Attached Devices List
CSTE, 16, // 0x40 - Current display state
NSTE, 16, // 0x42 - Next display state
SSTE, 16, // 0x44 - Set display state
Offset (0x46),
NDID, 8, // 0x46 - Number of Device IDs
DID1, 32, // 0x47 - Device ID 1
DID2, 32, // 0x4b - Device ID 2

4
src/southbridge/intel/i82801gx/nvs.h
View File

@ -71,9 +71,7 @@ typedef struct {
u8 tlst; /* 0x3d - Display Toggle List Pointer */
u8 cadl; /* 0x3e - currently attached devices */
u8 padl; /* 0x3f - previously attached devices */
u16 cste; /* 0x40 - current display state */
u16 nste; /* 0x42 - next display state */
u16 sste; /* 0x44 - set display state */
u16 rsvd14[3];
u8 ndid; /* 0x46 - number of device ids */
u32 did[5]; /* 0x47 - 5b device id 1..5 */
u8 rsvd5[0x9];

4
src/southbridge/intel/i82801ix/acpi/globalnvs.asl
View File

@ -16,7 +16,6 @@
/* Global Variables */
Name(\PICM, 0) // IOAPIC/8259
Name(\DSEN, 1) // Display Output Switching Enable
/* Global ACPI memory region. This region is used for passing information
* between coreboot (aka "the system bios"), ACPI, and the SMI handler.
@ -92,9 +91,6 @@ Field (GNVS, ByteAcc, NoLock, Preserve)
TLST, 8, // 0x3d - Display Toggle List pointer
CADL, 8, // 0x3e - Currently Attached Devices List
PADL, 8, // 0x3f - Previously Attached Devices List
CSTE, 16, // 0x40 - Current display state
NSTE, 16, // 0x42 - Next display state
SSTE, 16, // 0x44 - Set display state
Offset (0x46),
NDID, 8, // 0x46 - Number of Device IDs
DID1, 32, // 0x47 - Device ID 1

4
src/southbridge/intel/i82801ix/nvs.h
View File

@ -73,9 +73,7 @@ typedef struct {
u8 tlst; /* 0x3d - Display Toggle List Pointer */
u8 cadl; /* 0x3e - currently attached devices */
u8 padl; /* 0x3f - previously attached devices */
u16 cste; /* 0x40 - current display state */
u16 nste; /* 0x42 - next display state */
u16 sste; /* 0x44 - set display state */
u16 rsvd14[3];
u8 ndid; /* 0x46 - number of device ids */
u32 did[5]; /* 0x47 - 5b device id 1..5 */
u8 rsvd5[0x9];

4
src/southbridge/intel/i82801jx/acpi/globalnvs.asl
View File

@ -16,7 +16,6 @@
/* Global Variables */
Name(\PICM, 0) // IOAPIC/8259
Name(\DSEN, 1) // Display Output Switching Enable
/* Global ACPI memory region. This region is used for passing information
* between coreboot (aka "the system bios"), ACPI, and the SMI handler.
@ -92,9 +91,6 @@ Field (GNVS, ByteAcc, NoLock, Preserve)
TLST, 8, // 0x3d - Display Toggle List pointer
CADL, 8, // 0x3e - Currently Attached Devices List
PADL, 8, // 0x3f - Previously Attached Devices List
CSTE, 16, // 0x40 - Current display state
NSTE, 16, // 0x42 - Next display state
SSTE, 16, // 0x44 - Set display state
Offset (0x46),
NDID, 8, // 0x46 - Number of Device IDs
DID1, 32, // 0x47 - Device ID 1

4
src/southbridge/intel/i82801jx/nvs.h
View File

@ -71,9 +71,7 @@ typedef struct {
u8 tlst; /* 0x3d - Display Toggle List Pointer */
u8 cadl; /* 0x3e - currently attached devices */
u8 padl; /* 0x3f - previously attached devices */
u16 cste; /* 0x40 - current display state */
u16 nste; /* 0x42 - next display state */
u16 sste; /* 0x44 - set display state */
u16 rsvd14[3];
u8 ndid; /* 0x46 - number of device ids */
u32 did[5]; /* 0x47 - 5b device id 1..5 */
u8 rsvd5[0x9];

4
src/southbridge/intel/ibexpeak/nvs.h
View File

@ -74,9 +74,7 @@ typedef struct global_nvs_t {
u8 tlst; /* 0x3d - Display Toggle List Pointer */
u8 cadl; /* 0x3e - currently attached devices */
u8 padl; /* 0x3f - previously attached devices */
u16 cste; /* 0x40 - current display state */
u16 nste; /* 0x42 - next display state */
u16 sste; /* 0x44 - set display state */
u16 rsvd14[3];
u8 ndid; /* 0x46 - number of device ids */
u32 did[5]; /* 0x47 - 5b device id 1..5 */
u8 rsvd5[0x9];

4
src/southbridge/intel/lynxpoint/acpi/globalnvs.asl
View File

@ -16,7 +16,6 @@
/* Global Variables */
Name(\PICM, 0) // IOAPIC/8259
Name(\DSEN, 1) // Display Output Switching Enable
/* Global ACPI memory region. This region is used for passing information
* between coreboot (aka "the system bios"), ACPI, and the SMI handler.
@ -89,9 +88,6 @@ Field (GNVS, ByteAcc, NoLock, Preserve)
TLST, 8, // 0x3d - Display Toggle List pointer
CADL, 8, // 0x3e - Currently Attached Devices List
PADL, 8, // 0x3f - Previously Attached Devices List
CSTE, 16, // 0x40 - Current display state
NSTE, 16, // 0x42 - Next display state
SSTE, 16, // 0x44 - Set display state
Offset (0x46),
NDID, 8, // 0x46 - Number of Device IDs
DID1, 32, // 0x47 - Device ID 1

4
src/southbridge/intel/lynxpoint/nvs.h
View File

@ -75,9 +75,7 @@ typedef struct global_nvs_t {
u8 tlst; /* 0x3d - Display Toggle List Pointer */
u8 cadl; /* 0x3e - currently attached devices */
u8 padl; /* 0x3f - previously attached devices */
u16 cste; /* 0x40 - current display state */
u16 nste; /* 0x42 - next display state */
u16 sste; /* 0x44 - set display state */
u16 rsvd14[3];
u8 ndid; /* 0x46 - number of device ids */
u32 did[5]; /* 0x47 - 5b device id 1..5 */
/* TPM support */