imx: serial: use tty_encode_baud_rate to set true rate (d7f8d437) · Commits · 戴 / test

real baud rate may be different from the one requested. for upper layers, set the nearest value to the real rate in favour of the rate previously requested. Signed-off-by:

Oskar Schirmer <os@emlix.com> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

drivers/serial/imx.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -818,6 +818,7 @@ imx_set_termios(struct uart_port port, struct ktermios termios,
		unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
		unsigned int div, ufcr;
		unsigned long num, denom;
		uint64_t tdiv64;

		/*
		* If we don't support modem control lines, don't allow
		@@ -930,6 +931,12 @@ imx_set_termios(struct uart_port port, struct ktermios termios,
		rational_best_approximation(16 * div * baud, sport->port.uartclk,
		1 << 16, 1 << 16, &num, &denom);

		tdiv64 = sport->port.uartclk;
		tdiv64 *= num;
		do_div(tdiv64, denom * 16 * div);
		tty_encode_baud_rate(sport->port.info->port.tty,
		(speed_t)tdiv64, (speed_t)tdiv64);

		num -= 1;
		denom -= 1;

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