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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>
This commit is contained in:
Seunghwan Kim 2018-09-28 17:13:48 +09:00 committed by Martin Roth
parent 4e6b7907de
commit 00b539452b
1 changed files with 5 additions and 0 deletions
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5
src/mainboard/google/poppy/variants/nautilus/mainboard.c
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@ -86,6 +86,11 @@ void variant_devtree_update(void)
cfg->usb2_ports[4].tx_emp_enable = USB2_PRE_EMP_ON; 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_bias = USB2_BIAS_56MV;
cfg->usb2_ports[4].pre_emp_bit = USB2_HALF_BIT_PRE_EMP; 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; break;
default: default: