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Johan Hovold
7c3d02285a
While assumed not to make a difference, not using the factor-2 prescaler
makes the receiver more susceptible to errors.
Specifically, there have been reports of problems with devices that
cannot generate a 115200 rate with a smaller error than 2.1% (e.g.
117647 bps). But this can also be reproduced with a low-speed RS232
tranceiver at 115200 when the input rate matches the nominal rate.
So whenever possible, enable the factor-2 prescaler and halve the
divisor in order to use settings closer to that of the previous
algorithm.
Fixes: 3571456508 ("USB: serial: ch341: reimplement line-speed handling")
Cc: stable <[email protected]> # 5.5
Reported-by: Jakub Nantl <[email protected]>
Tested-by: Jakub Nantl <[email protected]>
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>