korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2025-01-27 08:14:35 +08:00
Code Issues Packages Projects Releases Wiki Activity

serial: sprd: Add loopback function support

Browse Source 
Add loopback function support for Spreadtrum serial controller.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Link: https://lore.kernel.org/r/1275cd9968f1ceb5ac049cc23f1e508025cd552f.1566375260.git.baolin.wang@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Baolin Wang 2019-08-21 20:39:09 +08:00 committed by Greg Kroah-Hartman
parent 6cbdf5c659
commit 37ba760b6b
1 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/tty/serial/sprd_serial.c
View File

@ -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)