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Date: Tue, 29 Dec 2020 10:33:52 +0100 From: Greg KH <gregkh@...uxfoundation.org> To: zhangqiumiao1@...wei.com Cc: jirislaby@...nel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] tty: make pl011 serial port driver support 485 mode On Tue, Dec 29, 2020 at 04:56:04PM +0800, zhangqiumiao1@...wei.com wrote: > From: zhangqiumiao <zhangqiumiao1@...wei.com> > > make pl011 serial port support 485 mode full duplex communication > > Signed-off-by: zhangqiumiao <zhangqiumiao1@...wei.com> Can you please use your "real name" or one you sign documents with? > --- > drivers/tty/serial/amba-pl011.c | 38 +++++++++++++++++++++++++++++++++ > 1 file changed, 38 insertions(+) > > diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c > index c255476cce28..f6a7fe61e699 100644 > --- a/drivers/tty/serial/amba-pl011.c > +++ b/drivers/tty/serial/amba-pl011.c > @@ -44,6 +44,7 @@ > > #include "amba-pl011.h" > > +#define ISEMPTY 1 > #define UART_NR 14 > > #define SERIAL_AMBA_MAJOR 204 > @@ -1284,14 +1285,33 @@ static inline bool pl011_dma_rx_running(struct uart_amba_port *uap) > #define pl011_dma_flush_buffer NULL > #endif > > +static unsigned int pl011_tx_empty(struct uart_port *port); > + > static void pl011_stop_tx(struct uart_port *port) > { > + unsigned int cr; > + unsigned int result; > struct uart_amba_port *uap = > > uap->im &= ~UART011_TXIM; > pl011_write(uap->im, uap, REG_IMSC); > pl011_dma_tx_stop(uap); > + if (port->rs485.flags & SER_RS485_ENABLEED) { > + whiel(1) { You obviously never built this code :(
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