kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-10-26 19:14:18 +00:00
Code Issues Releases Packages Activity
linux/drivers/net/wwan
History
Stephan Gerhold 4fd9f51368 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 2025-03-22 12:54:19 -07:00
..
iosm net: wwan: iosm: Fix hibernation by re-binding the driver around it 2025-02-17 10:04:53 +01:00
t7xx net: wwan: t7xx: Fix FSM command timeout issue 2025-01-09 13:33:41 +01:00
Kconfig Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-11-10 17:43:53 -08:00
Makefile net: wwan: t7xx: Add core components 2022-05-09 10:51:59 +01:00
mhi_wwan_ctrl.c wwan: core: Support slicing in port TX flow of WWAN subsystem 2023-03-17 22:38:31 -07:00
mhi_wwan_mbim.c net: wwan: mhi_wwan_mbim: Silence sequence number glitch errors 2025-03-22 12:54:19 -07:00
qcom_bam_dmux.c net: wwan: qcom_bam_dmux: Fix missing pm_runtime_disable() 2024-09-27 12:39:02 +01:00
rpmsg_wwan_ctrl.c net: wwan: replace deprecated strncpy with strscpy 2023-10-20 18:15:05 -07:00
wwan_core.c net: wwan: fix global oob in wwan_rtnl_policy 2024-10-21 11:38:44 +02:00
wwan_hwsim.c net: wwan: hwsim: make wwan_hwsim_class constant 2024-03-05 11:21:18 -08:00