diff options
Diffstat (limited to 'src/soc/intel/cannonlake/acpi')
| -rw-r--r-- | src/soc/intel/cannonlake/acpi/scs.asl | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/src/soc/intel/cannonlake/acpi/scs.asl b/src/soc/intel/cannonlake/acpi/scs.asl index cdfff911b8..0012a4dfd8 100644 --- a/src/soc/intel/cannonlake/acpi/scs.asl +++ b/src/soc/intel/cannonlake/acpi/scs.asl @@ -84,6 +84,7 @@ Scope (\_SB.PCI0) { Name (_ADR, 0x00140005) Name (_DDN, "SD Controller") Name (TEMP, 0) + Name (DSUU, ToUUID("f6c13ea5-65cd-461f-ab7a-29f7e8d5bd61")) OperationRegion (SDPC, PCI_Config, 0x00, 0x100) Field (SDPC, WordAcc, NoLock, Preserve) @@ -95,6 +96,67 @@ Scope (\_SB.PCI0) { PGEN, 1, /* PG_ENABLE */ } + /* _DSM x86 Device Specific Method + * Arg0: UUID Unique function identifier + * Arg1: Integer Revision Level + * Arg2: Integer Function Index (0 = Return Supported Functions) + * Arg3: Package Parameters + */ + Method (_DSM, 4) + { + If (LEqual (Arg0, ^DSUU)) { + /* Check the revision */ + If (LGreaterEqual (Arg1, Zero)) { + /* Switch statement based on the function index. */ + Switch (ToInteger (Arg2)) { + /* + * Function Index 0 the return value is a buffer containing + * one bit for each function index, starting with zero. + * Bit 0 - Indicates whether there is support for any functions other than function 0. + * Bit 1 - Indicates support to clear power control register + * Bit 2 - Indicates support to set power control register + * Bit 3 - Indicates support to set 1.8V signalling + * Bit 4 - Indicates support to set 3.3V signalling + * Bit 5 - Indicates support for HS200 mode + * Bit 6 - Indicates support for HS400 mode + * Bit 9 - Indicates eMMC I/O Driver Strength + */ + /* + * For SD we have to support functions to + * set 1.8V signalling and 3.3V signalling [BIT4, BIT3] + */ + Case (0) { + Return (Buffer () { 0x19 }) + } + + /* + * Function Index 3: Set 1.8v signalling. + * We put a sleep of 100ms in this method to + * work around a known issue with detecting + * UHS SD card on PCH. This is to compensate + * for the SD VR slowness. + */ + Case (3) { + Sleep (100) + Return(Buffer () { 0x00 }) + } + /* + * Function Index 4: Set 3.3v signalling. + * We put a sleep of 100ms in this method to + * work around a known issue with detecting + * UHS SD card on PCH. This is to compensate + * for the SD VR slowness. + */ + Case (4) { + Sleep (100) + Return(Buffer () { 0x00 }) + } + } + } + } + Return(Buffer() { 0x0 }) + } + Method(_INI) { /* Clear register 0x1C20/0x4820 */ |