serial: mvebu-uart: correctly calculate minimal possible baudrate

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For default (x16) scheme which is currently used by mvebu-uart.c driver,
maximal divisor of UART base clock is 1023*16. Therefore there is limit for
minimal supported baudrate. This change calculate it correctly and prevents
setting invalid divisor 0 into hardware registers.

Signed-off-by: Pali Rohár <pali@kernel.org>
Fixes: 68a0db1d7d ("serial: mvebu-uart: add function to change baudrate")
Link: https://lore.kernel.org/r/20210624224909.6350-4-pali@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Pali Rohár 2021-06-25 00:49:02 +02:00 • committed by Greg Kroah-Hartman

parent ecd6b010d8

commit deeaf96356

1 changed files with 8 additions and 3 deletions

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drivers/tty/serial/mvebu-uart.c

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