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IQ-9075: Boot time higher by 1 sec due to pcie driver probes #2029

@ctheegal

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@ctheegal

IQ-9075's Boot time (kernel phase) has degraded by 1 sec. PCIE driver probes are the bottlenecks causing this impact.

Device: https://www.qualcomm.com/internet-of-things/products/iq9-series/iq-9075

Good Build Tag: https://github.com/qualcomm-linux/meta-qcom-releases/releases/tag/qli-2.0-rc2
Bad Build (Boot issue seen) Tag: https://github.com/qualcomm-linux/meta-qcom-buildconf/releases/tag/master-260422.2

$ grep -E "init process|pcie returned|System time" dmesg.txt
[ 0.314139] probe of 1c00000.pcie returned 0 after 126496 usecs
[ 0.316995] probe of 1c10000.pcie returned 0 after 129119 usecs
[ 0.409084] Run /init as init process
[ 1.116268] systemd[1]: System time advanced to built-in epoch: Wed 2026-03-04 13:21:03 UTC

dmesg-rc2.txt
systemd_analyze-rc2.txt

ctheegal@ctheegal-sez /cygdrive/w/ctheegal/Lemans-Boot-logs/qli2.0-rc3/Logs
$ grep -E "init process|pcie returned|System time" dmesg.txt
[ 0.200701] probe of 1c00000.pcie returned -517 after 8 usecs
[ 0.200707] probe of 1c10000.pcie returned -517 after 12 usecs
[ 0.616452] probe of 1c00000.pcie returned 0 after 346846 usecs
[ 1.345910] probe of 1c10000.pcie returned 0 after 1076177 usecs
[ 1.347190] Run /init as init process
[ 2.139050] systemd[1]: System time advanced to timestamp on /var/lib/systemd/timesync/clock: Fri 2026-03-13 15:38:21 UTC

dmesg-master-260422.1.txt
systemd_analyze-master-260422.1.txt

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