sh: drain and wait for early printk (4a65e382) · Commits · 戴 / test

Drain by waiting for all characters to be sent, and make sure to wait a little bit after setting up the baud rate. Signed-off-by:

arch/sh/kernel/early_printk.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -143,6 +143,7 @@ static void scif_sercon_init(char *s)
		{
		struct uart_port *port = &scif_port;
		unsigned baud = DEFAULT_BAUD;
		unsigned int status;
		char *e;

		if (*s == ',')
		@@ -161,12 +162,17 @@ static void scif_sercon_init(char *s)
		baud = DEFAULT_BAUD;
		}

		do {
		status = sci_in(port, SCxSR);
		} while (!(status & SCxSR_TEND(port)));

		sci_out(port, SCSCR, 0); /* TE=0, RE=0 */
		sci_out(port, SCSMR, 0);

		/* Set baud rate */
		sci_out(port, SCBRR, (CONFIG_SH_PCLK_FREQ + 16 * baud) /
		(32 * baud) - 1);
		udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */

		sci_out(port, SCFCR, 12);
		sci_out(port, SCFCR, 8);