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authorSeunghwan Kim <sh_.kim@samsung.com>2018-09-28 17:13:48 +0900
committerMartin Roth <martinroth@google.com>2018-10-05 01:40:38 +0000
commit00b539452ba44b4cac4b73dd97841ec87ba1d964 (patch)
tree9b9f79f61c1bdd90dbc5aa33aa6639476ba0d2ab
parent4e6b7907de07c9c7d4b01a6213a8e13e946398cb (diff)
downloadcoreboot-00b539452ba44b4cac4b73dd97841ec87ba1d964.tar.xz
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 <sh_.kim@samsung.com> Reviewed-on: https://review.coreboot.org/28785 Reviewed-by: Furquan Shaikh <furquan@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
-rw-r--r--src/mainboard/google/poppy/variants/nautilus/mainboard.c5
1 files changed, 5 insertions, 0 deletions
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: