mb/google/brya/acpi: Set power down delay to 2ms after PEXVDD
Reduce the delay between PEXVDD and NVVDD from 3ms to 2ms
during power down sequences. The hardware discharge is
aggressive enough that we can safely optimize this.
BUG=b:288267305
TEST=build and measured delay is acceptable
Signed-off-by: Tarun Tuli <taruntuli@google.com>
Change-Id: I7c65301414044487e50bbbca618c4e602e571cfb
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76051
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
diff --git a/src/mainboard/google/brya/acpi/power.asl b/src/mainboard/google/brya/acpi/power.asl
index a51bcaa..7eb31d8 100644
--- a/src/mainboard/google/brya/acpi/power.asl
+++ b/src/mainboard/google/brya/acpi/power.asl
@@ -140,7 +140,7 @@
#if CONFIG(BOARD_GOOGLE_AGAH)
Sleep (10)
#else
- Sleep (3)
+ Sleep (2)
#endif
/* Deassert EN_PPVAR_GPU_NVVDD */
@@ -290,7 +290,7 @@
#if CONFIG(BOARD_GOOGLE_AGAH)
Sleep (10)
#else
- Sleep (3)
+ Sleep (2)
#endif
/* Ramp down NVVDD */
diff --git a/src/mainboard/google/brya/variants/hades/variant.c b/src/mainboard/google/brya/variants/hades/variant.c
index 0864ec0..48e2652 100644
--- a/src/mainboard/google/brya/variants/hades/variant.c
+++ b/src/mainboard/google/brya/variants/hades/variant.c
@@ -61,7 +61,7 @@
/* In GCOFF entry order (i.e., power-off order) */
static struct power_rail_sequence gpu_off_seq[] = {
{ "FBVDD", FBVDD_PWR_EN, false, FBVDD_PG, 0,},
- { "PEXVDD", PEXVDD_PWR_EN, false, PEXVDD_PG, 3,},
+ { "PEXVDD", PEXVDD_PWR_EN, false, PEXVDD_PG, 2,},
{ "NVVDD+MSVDD", NVVDD_PWR_EN, false, NVVDD_PG, 2,},
{ "GPU 3.3V", GPU_3V3_PWR_EN, false, GPU_3V3_PG, 4,},
{ "GPU 1.8V", GPU_1V8_PWR_EN, false, GPU_1V8_PG, 0,},