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tty: serial: lpc32xx_hs: fix missing console boot messages 

When probing the HSUART, it is put in loopback mode in order to prevent a
potential issue that may happen on RX (Errata HSUART.1).

serial_lpc32xx_startup() moves it out of loopback mode but this is too late
to get the kernel boot messages before userspace opens the device.

Also get out of loopback mode in lpc32xx_hsuart_console_setup().

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexandre Belloni 2019-01-15 18:18:14 +01:00 committed by Greg Kroah-Hartman
parent 7d470ebf58
commit b30fd1a6f6
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/lpc32xx_hs.c
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@ -151,6 +151,8 @@ static void lpc32xx_hsuart_console_write(struct console *co, const char *s,
local_irq_restore(flags); local_irq_restore(flags);
} }
static void lpc32xx_loopback_set(resource_size_t mapbase, int state);
static int __init lpc32xx_hsuart_console_setup(struct console *co, static int __init lpc32xx_hsuart_console_setup(struct console *co,
char *options) char *options)
{ {
@ -170,6 +172,8 @@ static int __init lpc32xx_hsuart_console_setup(struct console *co,
if (options) if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow); uart_parse_options(options, &baud, &parity, &bits, &flow);
lpc32xx_loopback_set(port->mapbase, 0); /* get out of loopback mode */
return uart_set_options(port, co, baud, parity, bits, flow); return uart_set_options(port, co, baud, parity, bits, flow);
} }