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mb/google/brya/acpi: Update GC6 sequences 

GC6 - Low power mode for system idle on Nvidia GPU

In GC6I Before ramp of PEXVDD:
Deassert FBVDDQ Enable, no delay is needed before or after.
In GC6O After ramp of PEXVDD:
Assert FBVDDQ Enable, no delay is needed before or after.

BUG=b:280467267
TEST=built for Hades and Agah, tested on Agah

Signed-off-by: Eran Mitrani <mitrani@google.com>
Change-Id: I0277772b1d2f6f4e6a3f74b92035e8b36f2670ba
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75302
Reviewed-by: Tarun Tuli <taruntuli@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Eran Mitrani 2023-05-16 15:13:50 -07:00 committed by Jakub Czapiga
parent 6930b9580e
commit b7a12982ac
1 changed files with 6 additions and 0 deletions
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6
src/mainboard/google/brya/acpi/power.asl
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@ -128,6 +128,9 @@ Method (GC6I, 0, Serialized)
/* Deassert PG_GPU_ALLRAILS */
CTXS (GPIO_GPU_ALLRAILS_PG)
/* Deassert FBVDDQ Enable */
CTXS (GPIO_FBVDD_PWR_EN)
/* Ramp down PEXVDD */
CTXS (GPIO_PEXVDD_PWR_EN)
GPPL (GPIO_PEXVDD_PG, 0, 20)
@ -173,6 +176,9 @@ Method (GC6O, 0, Serialized)
STXS (GPIO_PEXVDD_PWR_EN)
GPPL (GPIO_PEXVDD_PG, 1, 4)
/* Assert FBVDDQ Enable */
STXS (GPIO_FBVDD_PWR_EN)
/* Assert PG_GPU_ALLRAILS */
STXS (GPIO_GPU_ALLRAILS_PG)