serial: sprd: Add loopback function support (37ba760b) · Commits · 戴 / test

Add loopback function support for Spreadtrum serial controller. Signed-off-by:

drivers/tty/serial/sprd_serial.c

+9 −1

Original line number	Diff line number	Diff line
		@@ -79,6 +79,7 @@
		/* control register 1 */
		#define SPRD_CTL1 0x001C
		#define SPRD_DMA_EN BIT(15)
		#define SPRD_LOOPBACK_EN BIT(14)
		#define RX_HW_FLOW_CTL_THLD BIT(6)
		#define RX_HW_FLOW_CTL_EN BIT(7)
		#define TX_HW_FLOW_CTL_EN BIT(8)
		@@ -164,7 +165,14 @@ static unsigned int sprd_get_mctrl(struct uart_port *port)

		static void sprd_set_mctrl(struct uart_port *port, unsigned int mctrl)
		{
		/* nothing to do */
		u32 val = serial_in(port, SPRD_CTL1);

		if (mctrl & TIOCM_LOOP)
		val \|= SPRD_LOOPBACK_EN;
		else
		val &= ~SPRD_LOOPBACK_EN;

		serial_out(port, SPRD_CTL1, val);
		}

		static void sprd_stop_rx(struct uart_port *port)