From 00b539452ba44b4cac4b73dd97841ec87ba1d964 Mon Sep 17 00:00:00 2001 From: Seunghwan Kim Date: Fri, 28 Sep 2018 17:13:48 +0900 Subject: mb/google/poppy/variants/nautilus: Change SlowSlewRate settings for LTE sku Nautilus-LTE sku shows abnormal reset symptom at high temperature chamber test, but the root cause is unclear. Experimentally, setting SlowSlewRate IA/GT/SA to 1/2 improves this abnormal reset issue, so we would apply it until find root cause of this issue. BUG=b:117130599 BRANCH=poppy TEST=Built and passed on reliability test with modified coreboot Change-Id: I7fa0041989113097e3b283dbcf4ca2a73629fe54 Signed-off-by: Seunghwan Kim Reviewed-on: https://review.coreboot.org/28785 Reviewed-by: Furquan Shaikh Tested-by: build bot (Jenkins) --- src/mainboard/google/poppy/variants/nautilus/mainboard.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/src/mainboard/google/poppy/variants/nautilus/mainboard.c b/src/mainboard/google/poppy/variants/nautilus/mainboard.c index b9f6314d1b..bacf1a4c32 100644 --- a/src/mainboard/google/poppy/variants/nautilus/mainboard.c +++ b/src/mainboard/google/poppy/variants/nautilus/mainboard.c @@ -86,6 +86,11 @@ void variant_devtree_update(void) cfg->usb2_ports[4].tx_emp_enable = USB2_PRE_EMP_ON; cfg->usb2_ports[4].pre_emp_bias = USB2_BIAS_56MV; cfg->usb2_ports[4].pre_emp_bit = USB2_HALF_BIT_PRE_EMP; + + /* Override SlowSlewRate settings */ + cfg->SlowSlewRateForIa = 0; + cfg->SlowSlewRateForGt = 0; + cfg->SlowSlewRateForSa = 0; break; default: -- cgit v1.2.3