https://github.com/torvalds/linux
Revision c086e7096170390594c425114d98172bc9aceb8a authored by Bjørn Mork on 03 July 2016, 20:24:50 UTC, committed by David S. Miller on 04 July 2016, 23:12:03 UTC
Several Lenovo users have reported problems with their Sierra Wireless EM7455 modem. The driver has loaded successfully and the MBIM management channel has appeared to work, including establishing a connection to the mobile network. But no frames have been received over the data interface. The problem affects all EM7455 and MC7455, and is assumed to affect other modems based on the same Qualcomm chipset and baseband firmware. Testing narrowed the problem down to what seems to be a firmware timing bug during initialization. Adding a short sleep while probing is sufficient to make the problem disappear. Experiments have shown that 1-2 ms is too little to have any effect, while 10-20 ms is enough to reliably succeed. Reported-by: Stefan Armbruster <ml001@armbruster-it.de> Reported-by: Ralph Plawetzki <ralph@purejava.org> Reported-by: Andreas Fett <andreas.fett@secunet.com> Reported-by: Rasmus Lerdorf <rasmus@lerdorf.com> Reported-by: Samo Ratnik <samo.ratnik@gmail.com> Reported-and-tested-by: Aleksander Morgado <aleksander@aleksander.es> Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: David S. Miller <davem@davemloft.net>
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Tip revision: c086e7096170390594c425114d98172bc9aceb8a authored by Bjørn Mork on 03 July 2016, 20:24:50 UTC
cdc_ncm: workaround for EM7455 "silent" data interface
cdc_ncm: workaround for EM7455 "silent" data interface
Tip revision: c086e70
File | Mode | Size |
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Documentation | ||
arch | ||
block | ||
certs | ||
crypto | ||
drivers | ||
firmware | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.get_maintainer.ignore | -rw-r--r-- | 31 bytes |
.gitignore | -rw-r--r-- | 1.2 KB |
.mailmap | -rw-r--r-- | 6.4 KB |
COPYING | -rw-r--r-- | 18.3 KB |
CREDITS | -rw-r--r-- | 95.5 KB |
Kbuild | -rw-r--r-- | 2.8 KB |
Kconfig | -rw-r--r-- | 252 bytes |
MAINTAINERS | -rw-r--r-- | 353.8 KB |
Makefile | -rw-r--r-- | 56.0 KB |
README | -rw-r--r-- | 18.1 KB |
REPORTING-BUGS | -rw-r--r-- | 7.3 KB |
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