From 3263309ce59744bee2e0a3b3cee1a3dbdef07318 Mon Sep 17 00:00:00 2001 From: Kenneth Chan Date: Thu, 7 May 2020 17:59:03 +0800 Subject: mb/google/octopus/variants/dood: Disable XHCI LFPS power management LTE module Fibocom L850-GL is lost after idle overnight, with this workaround, host will not initiate U3 wakeup at the same time with device, which will avoid the race condition. Disable XHCI LFPS power management. If the option is set in the devicetree, the bits[7:4] in XHCI MMIO BAR + offset 0x80A4 (PMCTRL_REG) will be updated from default 9 to 0. BUG=b:155955302 BRANCH=octopus TEST=build coreboot with DisableXhciLfpsPM being set to 1 and flash the image to the device. Run following command to check if bits[7:4] are set 0: >iotools mmio_read32 "XHCI MMIO BAR + 0x80A4" Signed-off-by: Kenneth Chan Change-Id: I88357f44317a5cff2e04508638eb065e5ada4c4c Reviewed-on: https://review.coreboot.org/c/coreboot/+/41143 Tested-by: build bot (Jenkins) Reviewed-by: Marco Chen Reviewed-by: Ren Kuo --- .../google/octopus/variants/dood/overridetree.cb | 1 + src/mainboard/google/octopus/variants/dood/variant.c | 19 +++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/src/mainboard/google/octopus/variants/dood/overridetree.cb b/src/mainboard/google/octopus/variants/dood/overridetree.cb index 6df9f5395e..e1f12cf08f 100644 --- a/src/mainboard/google/octopus/variants/dood/overridetree.cb +++ b/src/mainboard/google/octopus/variants/dood/overridetree.cb @@ -149,4 +149,5 @@ chip soc/intel/apollolake # Disable compliance mode register "DisableComplianceMode" = "1" + register "disable_xhci_lfps_pm" = "0" end diff --git a/src/mainboard/google/octopus/variants/dood/variant.c b/src/mainboard/google/octopus/variants/dood/variant.c index e728fe3a08..ab049a87c1 100644 --- a/src/mainboard/google/octopus/variants/dood/variant.c +++ b/src/mainboard/google/octopus/variants/dood/variant.c @@ -8,6 +8,7 @@ #include #include #include +#include enum { SKU_1_LTE = 1, /* Wifi + LTE */ @@ -61,3 +62,21 @@ void variant_smi_sleep(u8 slp_typ) return; } } + +void variant_update_devtree(struct device *dev) +{ + struct soc_intel_apollolake_config *cfg = NULL; + + cfg = (struct soc_intel_apollolake_config *)dev->chip_info; + + if (cfg != NULL && cfg->disable_xhci_lfps_pm) { + switch (google_chromeec_get_board_sku()) { + case SKU_1_LTE: + case SKU_3_LTE_2CAM: + cfg->disable_xhci_lfps_pm = 1; + return; + default: + return; + } + } +} -- cgit v1.2.3