This patch makes use of device-tree property disable-dsr. Disabling
DSR can be necessary on i.MX6SX to quirk buggy hardware, for more
info see commit 276b891e3879 ("ARM: dts: imx6sx: document SION
necessity of ENET1_REF_CLK1").
Signed-off-by: Christoph Fritz <chf.fritz@xxxxxxxxxxxxxx>
---
drivers/tty/serial/imx.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 0df2b1c..bd85a69a4 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -207,6 +207,7 @@ struct imx_port {
unsigned int dte_mode:1;
unsigned int irda_inv_rx:1;
unsigned int irda_inv_tx:1;
+ unsigned int dsr:1;
unsigned short trcv_delay; /* transceiver delay */
struct clk *clk_ipg;
struct clk *clk_per;
@@ -1219,7 +1220,8 @@ static int imx_startup(struct uart_port *port)
/*
* Finally, clear and enable interrupts
*/
- writel(USR1_RTSD | USR1_DTRD, sport->port.membase + USR1);
+ temp = USR1_RTSD | (sport->dsr ? USR1_DTRD : 0);
+ writel(temp, sport->port.membase + USR1);
writel(USR2_ORE, sport->port.membase + USR2);
if (sport->dma_is_inited && !sport->dma_is_enabled)
@@ -1259,7 +1261,7 @@ static int imx_startup(struct uart_port *port)
* now, too.
*/
temp |= IMX21_UCR3_RXDMUXSEL | UCR3_ADNIMP |
- UCR3_DTRDEN | UCR3_RI | UCR3_DCD;
+ (sport->dsr ? UCR3_DTRDEN : 0) | UCR3_RI | UCR3_DCD;
if (sport->dte_mode)
temp &= ~(UCR3_RI | UCR3_DCD);
@@ -1987,6 +1989,9 @@ static int serial_imx_probe_dt(struct imx_port *sport,
if (of_get_property(np, "fsl,dte-mode", NULL))
sport->dte_mode = 1;
+ if (!of_property_read_bool(np, "disable-dsr"))
+ sport->dsr = 1;
+
return 0;
}
#else
--
2.1.4
--
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