Change in coreboot[master]: mb/google/brya/var/primus{4es}: Decrease touchscreen T3 timing to 200ms

[Paul Fagerburg (Code Review)]

Paul Fagerburg has submitted this change. ( https://review.coreboot.org/c/coreboot/+/63201 )

Change subject: mb/google/brya/var/primus{4es}: Decrease touchscreen T3 timing to 200ms
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mb/google/brya/var/primus{4es}: Decrease touchscreen T3 timing to 200ms

We set T3 as 300ms to meet Elan's spec, but the resume/suspend times
are greater than 500ms, which is the spec for Chromebooks.
The actual kernel timing has been measured, and given the ACPI delay
after deasserting reset in addition to the delay until the kernel
driver accesses the device, delaying only 200ms in the ACPI method is
also sufficient to meet the 300ms requirement.

BUG=b:223936777
BRANCH=none
TEST=build and test touchscreen function on DUT.
TEST=suspend, wake DUT and check touchscreen function.

Change-Id: I6b04cf6392d924aed01ca36b720f889b88d92311
Signed-off-by: Casper Chang 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63201
Tested-by: build bot (Jenkins) 
Reviewed-by: Tim Wawrzynczak 
---
M src/mainboard/google/brya/variants/primus/overridetree.cb
M src/mainboard/google/brya/variants/primus4es/overridetree.cb
2 files changed, 2 insertions(+), 2 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Tim Wawrzynczak: Looks good to me, approved

diff --git a/src/mainboard/google/brya/variants/primus/overridetree.cb b/src/mainboard/google/brya/variants/primus/overridetree.cb
index c01516c..8fc1f14 100644
--- a/src/mainboard/google/brya/variants/primus/overridetree.cb
+++ b/src/mainboard/google/brya/variants/primus/overridetree.cb
@@ -221,7 +221,7 @@
    			register "generic.probed" = "1"
    			register "generic.reset_gpio" =
    						"ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_C1)"
-				register "generic.reset_delay_ms" = "300"
+				register "generic.reset_delay_ms" = "200"
    			register "generic.reset_off_delay_ms" = "1"
    			register "generic.enable_gpio" =
    						"ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPP_C0)"
diff --git a/src/mainboard/google/brya/variants/primus4es/overridetree.cb b/src/mainboard/google/brya/variants/primus4es/overridetree.cb
index e2b8d02..d56cc06 100644
--- a/src/mainboard/google/brya/variants/primus4es/overridetree.cb
+++ b/src/mainboard/google/brya/variants/primus4es/overridetree.cb
@@ -208,7 +208,7 @@
    			register "generic.probed" = "1"
    			register "generic.reset_gpio" =
    						"ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_C1)"
-				register "generic.reset_delay_ms" = "300"
+				register "generic.reset_delay_ms" = "200"
    			register "generic.reset_off_delay_ms" = "1"
    			register "generic.enable_gpio" =
    						"ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPP_C0)"