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Subject[PATCH 01/14] serial: tegra: add internal loopback functionality
Date
From: Andreas Abel <aabel@nvidia.com>

Add the internal loopback functionality that can be enabled with
TIOCM_LOOP.

Signed-off-by: Andreas Abel <aabel@nvidia.com>
Signed-off-by: Krishna Yarlagadda <kyarlagadda@nvidia.com>
---
drivers/tty/serial/serial-tegra.c | 26 ++++++++++++++++++++++----
1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
index d5269aa..19f4c24 100644
--- a/drivers/tty/serial/serial-tegra.c
+++ b/drivers/tty/serial/serial-tegra.c
@@ -4,7 +4,7 @@
*
* High-speed serial driver for NVIDIA Tegra SoCs
*
- * Copyright (c) 2012-2013, NVIDIA CORPORATION. All rights reserved.
+ * Copyright (c) 2012-2019, NVIDIA CORPORATION. All rights reserved.
*
* Author: Laxman Dewangan <ldewangan@nvidia.com>
*/
@@ -192,16 +192,34 @@ static void set_dtr(struct tegra_uart_port *tup, bool active)
}
}

+static void set_loopbk(struct tegra_uart_port *tup, bool active)
+{
+ unsigned long mcr = tup->mcr_shadow;
+
+ if (active)
+ mcr |= UART_MCR_LOOP;
+ else
+ mcr &= ~UART_MCR_LOOP;
+
+ if (mcr != tup->mcr_shadow) {
+ tegra_uart_write(tup, mcr, UART_MCR);
+ tup->mcr_shadow = mcr;
+ }
+}
+
static void tegra_uart_set_mctrl(struct uart_port *u, unsigned int mctrl)
{
struct tegra_uart_port *tup = to_tegra_uport(u);
- int dtr_enable;
+ int enable;

tup->rts_active = !!(mctrl & TIOCM_RTS);
set_rts(tup, tup->rts_active);

- dtr_enable = !!(mctrl & TIOCM_DTR);
- set_dtr(tup, dtr_enable);
+ enable = !!(mctrl & TIOCM_DTR);
+ set_dtr(tup, enable);
+
+ enable = !!(mctrl & TIOCM_LOOP);
+ set_loopbk(tup, enable);
}

static void tegra_uart_break_ctl(struct uart_port *u, int break_ctl)
--
2.7.4
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