netdev - [net-next 19/39] can: m_can: m_can_chip_config(): enable and configure internal timestamps

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210330114559.1114855-20-mkl@pengutronix.de>
Date:   Tue, 30 Mar 2021 13:45:39 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        kernel@...gutronix.de,
        Torin Cooper-Bennun <torin@...iluxsystems.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [net-next 19/39] can: m_can: m_can_chip_config(): enable and configure internal timestamps

From: Torin Cooper-Bennun <torin@...iluxsystems.com>

This is a prerequisite for transitioning the m_can driver to rx-offload,
which works best with TX and RX timestamps.

The timestamps provided by M_CAN are 16-bit, timed according to the
nominal bit timing, and may be prescaled by a multiplier up to 16. We
choose the highest prescalar so that the timestamp wraps every 2^20 bit
times, or 209 ms at a bus speed of 5 Mbit/s. Timestamps will have a
precision of 16 bit times.

Link: https://lore.kernel.org/r/20210308102427.63916-3-torin@maxiluxsystems.com
Signed-off-by: Torin Cooper-Bennun <torin@...iluxsystems.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/m_can/m_can.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 9f7cfe91f7ff..7df81e38b043 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1135,6 +1135,7 @@ static int m_can_set_bittiming(struct net_device *dev)
  *		- >= v3.1.x: TX FIFO is used
  * - configure mode
  * - setup bittiming
+ * - configure timestamp generation
  */
 static void m_can_chip_config(struct net_device *dev)
 {
@@ -1246,6 +1247,10 @@ static void m_can_chip_config(struct net_device *dev)
 	/* set bittiming params */
 	m_can_set_bittiming(dev);
 
+	/* enable internal timestamp generation, with a prescalar of 16. The
+	 * prescalar is applied to the nominal bit timing */
+	m_can_write(cdev, M_CAN_TSCC, FIELD_PREP(TSCC_TCP_MASK, 0xf));
+
 	m_can_config_endisable(cdev, false);
 
 	if (cdev->ops->init)
-- 
2.30.2