From 17d71937a19604090258853b0856dfbe915edb0e Mon Sep 17 00:00:00 2001 From: Tim Wawrzynczak Date: Wed, 27 Jul 2022 10:05:29 -0600 Subject: mb/google/brya/var/agah: Optimize dGPU GCOFF entry After staring at lots of scope shots, the EE has determined that a few modifications to the GCOFF sequence can be made: - Remove delay between PERST# assertion and GPU_ALLRAILS_PG deassertion - Remove delay after ramping down FBVDD This patch implements these minor changes. BUG=b:240199017 TEST=verified by EE Signed-off-by: Tim Wawrzynczak Change-Id: I7d492b3e65a231bc5f64fe9c3add60b5e72eb072 Reviewed-on: https://review.coreboot.org/c/coreboot/+/66199 Tested-by: build bot (Jenkins) Reviewed-by: Eric Lai Reviewed-by: Ivy Jian Reviewed-by: Subrata Banik --- src/mainboard/google/brya/acpi/power.asl | 2 -- 1 file changed, 2 deletions(-) (limited to 'src/mainboard/google/brya/acpi') diff --git a/src/mainboard/google/brya/acpi/power.asl b/src/mainboard/google/brya/acpi/power.asl index e52ff8753c..6f69c89374 100644 --- a/src/mainboard/google/brya/acpi/power.asl +++ b/src/mainboard/google/brya/acpi/power.asl @@ -174,7 +174,6 @@ Method (PGOF, 0, Serialized) /* Assert PERST# */ \_SB.PCI0.CTXS (GPIO_GPU_PERST_L) - Sleep (5) /* All rails are about to go down */ \_SB.PCI0.CTXS (GPIO_GPU_ALLRAILS_PG) @@ -183,7 +182,6 @@ Method (PGOF, 0, Serialized) /* Ramp down FBVDD (active-low) and let rail discharge to <10% */ \_SB.PCI0.STXS (GPIO_FBVDD_PWR_EN) GPPL (GPIO_FBVDD_PG, 0, 20) - Sleep (40) /* Ramp down PEXVDD and let rail discharge to <10% */ \_SB.PCI0.CTXS (GPIO_PEXVDD_PWR_EN) -- cgit v1.2.3