mb/google/rex: Implement S0ix hooks aka `MS0X` method

This patch ensures to be able to drive SYS_SLP_S0IX_L `low` based
on the state of the system while `SLP_S0_L` signal is `low` (while
the system is in S0ix).

Implemented runtime ASL method (MS0X) being called by PEPD device
_DSM to configure `SLP_S0_GATE (GPP_H14)` PIN at S0ix entry/exit.

Scope (\_SB)
{
   Method (MS0X, 1, Serialized)
   {
      If ((Arg0 == One))
      {
         \_SB.PCI0.CTXS (0x75)
      }
      Else
      {
         \_SB.PCI0.STXS (0x75)
      }
}

BUG=b:256807255
TEST=Able to see SYS_SLP_S0IX_L goes low in S0ix.

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: Ie6b5e066f228ea5dc79ae14dd803fc283fd248ce
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70196
Reviewed-by: Sukumar Ghorai <sukumar.ghorai@intel.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions