Hi! > From: Raviteja Narayanam <[email protected]> > > [ Upstream commit 42e11948ddf68b9f799cad8c0ddeab0a39da33e8 ] > > On some platforms, the log is corrupted while console is being > registered. It is observed that when set_termios is called, there > are still some bytes in the FIFO to be transmitted. > > So, wait for tx_empty inside cdns_uart_console_setup before calling > set_termios.
> @@ -1246,6 +1247,13 @@ static int cdns_uart_console_setup(struct console *co,
> char *options)
> if (options)
> uart_parse_options(options, &baud, &parity, &bits, &flow);
>
> + /* Wait for tx_empty before setting up the console */
> + time_out = jiffies + usecs_to_jiffies(TX_TIMEOUT);
> +
> + while (time_before(jiffies, time_out) &&
> + cdns_uart_tx_empty(port) != TIOCSER_TEMT)
> + cpu_relax();
> +
So this is spinning for half a second. Could we use msleep(1) instead
of cpu_relax or something like that?
Best regards,
Pavel
--
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