From: Krishna Yarlagadda <kyarlagadda@nvidia.com>
To: gregkh@linuxfoundation.org, robh+dt@kernel.org,
mark.rutland@arm.com, thierry.reding@gmail.com,
jonathanh@nvidia.com, ldewangan@nvidia.com, jslaby@suse.com
Cc: linux-serial@vger.kernel.org, devicetree@vger.kernel.org,
linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org,
Andreas Abel <aabel@nvidia.com>,
Krishna Yarlagadda <kyarlagadda@nvidia.com>
Subject: [PATCH 01/14] serial: tegra: add internal loopback functionality
Date: Mon, 12 Aug 2019 16:58:10 +0530 [thread overview]
Message-ID: <1565609303-27000-2-git-send-email-kyarlagadda@nvidia.com> (raw)
In-Reply-To: <1565609303-27000-1-git-send-email-kyarlagadda@nvidia.com>
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
next prev parent reply other threads:[~2019-08-12 11:28 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-12 11:28 [PATCH 00/14] serial: tegra: Tegra186 support and fixes Krishna Yarlagadda
2019-08-12 11:28 ` Krishna Yarlagadda [this message]
2019-08-13 9:38 ` [PATCH 01/14] serial: tegra: add internal loopback functionality Thierry Reding
2019-08-12 11:28 ` [PATCH 02/14] serial: tegra: add support to ignore read Krishna Yarlagadda
2019-08-13 9:42 ` Thierry Reding
2019-08-27 9:29 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 03/14] serial: tegra: avoid reg access when clk disabled Krishna Yarlagadda
2019-08-13 9:45 ` Thierry Reding
2019-08-27 9:29 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 04/14] serial: tegra: protect IER against LCR.DLAB Krishna Yarlagadda
2019-08-13 9:46 ` Thierry Reding
2019-08-12 11:28 ` [PATCH 05/14] serial: tegra: flush the RX fifo on frame error Krishna Yarlagadda
2019-08-13 9:48 ` Thierry Reding
2019-08-27 9:29 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 06/14] serial: tegra: report error to upper tty layer Krishna Yarlagadda
2019-08-13 9:52 ` Thierry Reding
2019-08-27 9:29 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 07/14] serial: tegra: add compatible for new chips Krishna Yarlagadda
2019-08-13 9:55 ` Thierry Reding
2019-08-27 9:29 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 08/14] serial: tegra: check for FIFO mode enabled status Krishna Yarlagadda
2019-08-13 10:03 ` Thierry Reding
2019-08-27 9:29 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 09/14] serial: tegra: set maximum num of uart ports to 8 Krishna Yarlagadda
2019-08-13 10:19 ` Thierry Reding
2019-08-27 9:30 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 10/14] serial: tegra: add support to use 8 bytes trigger Krishna Yarlagadda
2019-08-19 20:29 ` Jon Hunter
2019-08-27 9:31 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 11/14] serial: tegra: DT for Adjusted baud rates Krishna Yarlagadda
2019-08-13 10:24 ` Thierry Reding
2019-08-27 9:31 ` Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 12/14] serial: tegra: add support to adjust baud rate Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 13/14] serial: tegra: report clk rate errors Krishna Yarlagadda
2019-08-12 11:28 ` [PATCH 14/14] serial: tegra: Add PIO mode support Krishna Yarlagadda
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