On Wed, Nov 21, 2018 at 11:31:42AM +0200, Andy Shevchenko wrote: > Since SPCR 1.04 [1] the baud rate of 0 means a preconfigured state of UART. > Assume firmware or bootloader configures console correctly. > > [1]: https://docs.microsoft.com/en-us/windows-hardware/drivers/serports/serial-port-console-redirection-table > > Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> > --- > drivers/acpi/spcr.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/acpi/spcr.c b/drivers/acpi/spcr.c > index 9d52743080a4..ea92d88c02a6 100644 > --- a/drivers/acpi/spcr.c > +++ b/drivers/acpi/spcr.c > @@ -148,6 +148,12 @@ int __init acpi_parse_spcr(bool enable_earlycon, bool enable_console) > } > > switch (table->baud_rate) { > + case 0: > + /* > + * SPCR 1.04 defines 0 as a preconfigured state of UART. > + * Assume firmware or bootloader configures console correctly. > + */ Oops, it works by lack. Here we need to assign baud rate to 0. I'll send v2 soon. > + break; > case 3: > baud_rate = 9600; > break; > -- > 2.19.1 > -- With Best Regards, Andy Shevchenko
