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Commit e0923b4f authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
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USB: serial: ch341: fix lost character on LCR updates



commit 8e83622a upstream.

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>
[ johan: adjust context to 5.15 ]
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 55d32892
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