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linux/drivers/net/wwan
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Stephan Gerhold d81ee62948 net: wwan: mhi_wwan_mbim: Silence sequence number glitch errors 
[ Upstream commit 0d1fac6d26 ]

When using the Qualcomm X55 modem on the ThinkPad X13s, the kernel log is
constantly being filled with errors related to a "sequence number glitch",
e.g.:

	[ 1903.284538] sequence number glitch prev=16 curr=0
	[ 1913.812205] sequence number glitch prev=50 curr=0
	[ 1923.698219] sequence number glitch prev=142 curr=0
	[ 2029.248276] sequence number glitch prev=1555 curr=0
	[ 2046.333059] sequence number glitch prev=70 curr=0
	[ 2076.520067] sequence number glitch prev=272 curr=0
	[ 2158.704202] sequence number glitch prev=2655 curr=0
	[ 2218.530776] sequence number glitch prev=2349 curr=0
	[ 2225.579092] sequence number glitch prev=6 curr=0

Internet connectivity is working fine, so this error seems harmless. It
looks like modem does not preserve the sequence number when entering low
power state; the amount of errors depends on how actively the modem is
being used.

A similar issue has also been seen on USB-based MBIM modems [1]. However,
in cdc_ncm.c the "sequence number glitch" message is a debug message
instead of an error. Apply the same to the mhi_wwan_mbim.c driver to
silence these errors when using the modem.

[1]: https://lists.freedesktop.org/archives/libmbim-devel/2016-November/000781.html

Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org>
Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://patch.msgid.link/20250212-mhi-wwan-mbim-sequence-glitch-v1-1-503735977cbd@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-03-28 21:58:52 +01:00
..
iosm net: wwan: iosm: Fix hibernation by re-binding the driver around it 2025-02-21 13:49:33 +01:00
t7xx net: wwan: t7xx: Fix FSM command timeout issue 2025-01-09 13:30:02 +01:00
Kconfig net: wwan: iosm: fix driver not working with INTEL_IOMMU disabled 2022-11-09 14:00:25 +00:00
Makefile net: wwan: t7xx: Add core components 2022-05-09 10:51:59 +01:00
mhi_wwan_ctrl.c net: wwan: mhi_wwan_ctrl: Add DUN2 to have a secondary AT port 2022-09-20 16:07:12 -07:00
mhi_wwan_mbim.c net: wwan: mhi_wwan_mbim: Silence sequence number glitch errors 2025-03-28 21:58:52 +01:00
qcom_bam_dmux.c net: wwan: qcom_bam_dmux: Fix missing pm_runtime_disable() 2024-10-17 15:21:31 +02:00
rpmsg_wwan_ctrl.c net: wwan: Allow WWAN drivers to provide blocking tx and poll function 2021-06-18 13:13:40 -07:00
wwan_core.c net: wwan: fix global oob in wwan_rtnl_policy 2024-11-01 01:56:04 +01:00
wwan_hwsim.c wwan_hwsim: fix possible memory leak in wwan_hwsim_dev_new() 2022-10-19 17:25:10 -07:00