diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2015-03-09 23:27:16 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-26 18:17:55 +0300 |
| commit | 0e3e143e5d1e7be65331cdf6d100b08bc6c15b72 (patch) | |
| tree | 790b0276b7991bf2ff2218de7c81a45674bf0aa9 /drivers/tty/serial/8250 | |
| parent | feed5bab0d33feb5dbe5365b34d044c79f93dc6b (diff) | |
| download | linux-0e3e143e5d1e7be65331cdf6d100b08bc6c15b72.tar.xz | |
serial: 8250_early: Assume uart already initialized if no baud option
The <baud><parity><bit> option string is not supplied if the earlycon
is started via devicetree and OF_EARLYCON_DECLARE(). The option string
is also not required if started via kernel command line parameters of
the form:
earlycon=uart,mmio,<addr>
console=uart,mmio,<addr>
If earlycon_device->baud is 0, then an option string was not supplied.
In this case, assume the uart has already been initialized by the
bootloader or firmware.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/8250')
| -rw-r--r-- | drivers/tty/serial/8250/8250_early.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c index d7b831bcf367..1701d00fd9f6 100644 --- a/drivers/tty/serial/8250/8250_early.c +++ b/drivers/tty/serial/8250/8250_early.c @@ -149,12 +149,18 @@ static int __init early_serial8250_setup(struct earlycon_device *device, return 0; if (!device->baud) { + struct uart_port *port = &device->port; + unsigned int ier; + device->baud = probe_baud(&device->port); snprintf(device->options, sizeof(device->options), "%u", device->baud); - } - init_port(device); + /* assume the device was initialized, only mask interrupts */ + ier = serial8250_early_in(port, UART_IER); + serial8250_early_out(port, UART_IER, ier & UART_IER_UUE); + } else + init_port(device); device->con->write = early_serial8250_write; return 0; |