diff options
| -rw-r--r-- | drivers/tty/hvc/hvc_dcc.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/tty/hvc/hvc_dcc.c b/drivers/tty/hvc/hvc_dcc.c index 1751108cf763..136381bec7cd 100644 --- a/drivers/tty/hvc/hvc_dcc.c +++ b/drivers/tty/hvc/hvc_dcc.c @@ -47,6 +47,14 @@ static void dcc_early_write(struct console *con, const char *s, unsigned n) static int __init dcc_early_console_setup(struct earlycon_device *device, const char *opt) { + unsigned int count = 0x4000000; + + while (--count && (__dcc_getstatus() & DCC_STATUS_TX)) + cpu_relax(); + + if (__dcc_getstatus() & DCC_STATUS_TX) + return -ENODEV; + device->con->write = dcc_early_write; return 0; |