[PATCH 1/2 v2] serial/aspeed-vuart: Only disable host tx discard when serial port is in use

[Jeremy Kerr]

Hi Stewart,

>> OpenPOWER firmware doesn't like it when the host-side of the VUART's
>> FIFO is not drained. This change only disables host TX discard mode when
>> the port has been opened.
> 
> Do we have what's arguably a bug somewhere?

I'm not 100% sure that it's a bug; it's fairly reasonable to expect that
a UART's TX FIFO will be drained. That expectation is present in a lot
of different UART implementations (including skiboot & Linux).

Cheers,


Jeremy