When enable_gpio is used as active low output, the _STA returns
incorrect value.
Also, simply the logic for _STA method.
When enable pin is used for _STA:
| polarity | tx value| get_tx_gpio() | State |
| active high | 0 | 0 | 0 |
| active high | 1 | 1(active) | 1 |
| active low | 0 | 1(active) | 1 |
| active low | 1 | 0 | 0 |
When reset pin is used for _STA:
| polarity | tx value| get_tx_gpio() | State |
| active high | 0 | 0 | 1 |
| active high | 1 | 1(active) | 0 |
| active low | 0 | 1(active) | 0 |
| active low | 1 | 0 | 1 |
Generated _STA method:
Ex: for using active low power enable GPIO pin GPPC_H17:
Method (_STA, 0, NotSerialized) // _STA: Status
{
Local0 = \_SB.PCI0.GTXS (0x5C)
Local0 ^= One
Return (Local0)
}
TEST=Check the SSDT when booted to OS.
Signed-off-by: Cliff Huang <cliff.huang@intel.com>
Change-Id: Ie6f1e7a5b3e9fd0ea00e1e5b54058a14c6e9e09e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72421
Reviewed-by: Jérémy Compostella <jeremy.compostella@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
9a5a9635b7