[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH RFC 4/8] ns16550: support DesignWare 8250
>>> On 10.09.13 at 16:18, Ian Campbell <ian.campbell@xxxxxxxxxx> wrote: > @@ -233,6 +234,16 @@ static void ns16550_setup_preirq(struct ns16550 *uart) > /* No interrupts. */ > ns_write_reg(uart, UART_IER, 0); > > + if ( uart->dw_usr_bsy && > + (ns_read_reg(uart, UART_IIR) & UART_IIR_BSY) == UART_IIR_BSY ) > + { > + /* DesignWare 8250 detects if LCR is written while the UART is > + * busy and raises a "busy detect" interrupt. Read the UART > + * Status Register to clear this state. > + */ > + (void)ns_read_reg(uart, UART_USR); Pointless cast? Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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