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mb/google/dedede/var/storo: Set the xHCI LFPS period sampling off time to 0ms 

LTE module L850-GL may encounter U3 wakeup race condition with the host.
Setting xHCI LFPS periodic sampling off time to 0ms so that the host would not
miss the device-initiated U3 wakeup thus avoid the race condition.

BUG=b:193898133
BRANCH=dedede
TEST=flash the image to the device. Run following command to check the bits[7:4] is 0x0:
iotools mmio_read32 "XHCI MMIO BAR + 0x80A4"

Signed-off-by: Tao Xia <xiatao5@huaqin.corp-partner.google.com>
Change-Id: Ic84dc83b749cf3c6029a06730096b64ef8cb8cd9
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56626
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
This commit is contained in:
Tao Xia 2021-07-27 17:39:12 +08:00 committed by Patrick Georgi
parent 67d97a2705
commit 6c887544bb
1 changed files with 2 additions and 0 deletions
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src/mainboard/google/dedede/variants/storo/overridetree.cb
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@ -79,6 +79,8 @@ chip soc/intel/jasperlake
register "tcc_offset" = "10" # TCC of 95C
register "xhci_lfps_sampling_offtime_ms" = "0"
device domain 0 on
device pci 04.0 on
chip drivers/intel/dptf