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Commit 8e83622a authored by Johan Hovold's avatar Johan Hovold
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USB: serial: ch341: fix lost character on LCR updates



Disable LCR updates for pre-0x30 devices which use a different (unknown)
protocol for line control and where the current register write causes
the next received character to be lost.

Note that updating LCR using the INIT command has no effect on these
devices either.

Reported-by: default avatarJonathan Woithe <jwoithe@just42.net>
Tested-by: default avatarJonathan Woithe <jwoithe@just42.net>
Link: https://lore.kernel.org/r/Ys1iPTfiZRWj2gXs@marvin.atrad.com.au


Fixes: 4e46c410 ("USB: serial: ch341: reinitialize chip on reconfiguration")
Fixes: 55fa15b5 ("USB: serial: ch341: fix baud rate and line-control handling")
Cc: stable@vger.kernel.org      # 4.10
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
parent ceb40384
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