[XS] Change in coreboot[master]: mb/google/brya/acpi: Set power down delay to 2ms after PEXVDD

[Nick Vaccaro (Code Review)]

Nick Vaccaro has submitted this change. ( https://review.coreboot.org/c/coreboot/+/76051?usp=email )

(

3 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.
 )Change subject: mb/google/brya/acpi: Set power down delay to 2ms after PEXVDD
......................................................................

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 
Change-Id: I7c65301414044487e50bbbca618c4e602e571cfb
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76051
Reviewed-by: Nick Vaccaro 
Tested-by: build bot (Jenkins) 
Reviewed-by: Eric Lai 
---
M src/mainboard/google/brya/acpi/power.asl
M src/mainboard/google/brya/variants/hades/variant.c
2 files changed, 3 insertions(+), 3 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Eric Lai: Looks good to me, approved
  Nick Vaccaro: Looks good to me, approved

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,},