Hello. I would like to present a patch for ns8250 serial that I would like to commit in the near future (if there are no objections).
The patch is fixing newest DesignWare UART with busy detection. During frequency divisors configuration when UART is busy transferring or receiving data, line control register manipulation will not take effect. Therefore, we will not set divisor latch access bit and we will corrupt LCR instead of configuring divisors. It is necessary to wait until UART finishes all transfers to proceed with the configuration. This was detected on Armada XP as UART fails on this issue 100/100 attempts. The patch was tested by kevlo@ and me and it works on our Armada XP - based systems. Please send your comment or remarks if there are any. Best regards Zbigniew Bodek
0001-Wait-for-DesignWare-UART-transfers-completion-before.patch
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