tree 631c6ea1bdc73ef891cf32dea516a7fb5ca446dc
parent 190d14f3ddc66f1cfe7f48e83f91d2e3a8b12372
author David Engraf <david.engraf@sysgo.com> 1576486443 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1578141669 +0100

tty/serial: atmel: fix out of range clock divider handling

[ Upstream commit cb47b9f8630ae3fa3f5fbd0c7003faba7abdf711 ]

Use MCK_DIV8 when the clock divider is > 65535. Unfortunately the mode
register was already written thus the clock selection is ignored.

Fix by doing the baud rate calulation before setting the mode.

Fixes: 5bf5635ac170 ("tty/serial: atmel: add fractional baud rate support")
Signed-off-by: David Engraf <david.engraf@sysgo.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Acked-by: Richard Genoud <richard.genoud@gmail.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191216085403.17050-1-david.engraf@sysgo.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>