[RFC] tty: pl011: Work around stuck BUSY bit on QDF2400

On Mon, Jan 30, 2017 at 06:44:17PM -0500, Christopher Covington wrote:

 {
 	struct uart_amba_port *uap =
 	    container_of(port, struct uart_amba_port, port);
-	unsigned int status = pl011_read(uap, REG_FR);
+	unsigned int status = pl011_read(uap, REG_FR) ^ uap->vendor->inv_fr;
 	return status & (uap->vendor->fr_busy | UART01x_FR_TXFF) ?
 							0 : TIOCSER_TEMT;
 }

I'd much prefer the reg & mask == val approach, but the above makes that
difficult.

So for the PL011 changes:

Acked-by: Russell King <redacted>

Thanks.

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