linux-kernel - [PATCH v6 01/14] can: m_can: Start/Cancel polling timer together with interrupts

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Message-Id: <20230929141304.3934380-2-msp@baylibre.com>
Date:   Fri, 29 Sep 2023 16:12:51 +0200
From:   Markus Schneider-Pargmann <msp@...libre.com>
To:     Marc Kleine-Budde <mkl@...gutronix.de>,
        Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        Wolfgang Grandegger <wg@...ndegger.com>
Cc:     Vincent MAILHOL <mailhol.vincent@...adoo.fr>,
        Simon Horman <simon.horman@...igine.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Julien Panis <jpanis@...libre.com>, Judith Mendez <jm@...com>,
        Markus Schneider-Pargmann <msp@...libre.com>
Subject: [PATCH v6 01/14] can: m_can: Start/Cancel polling timer together with interrupts

Interrupts are enabled/disabled in more places than just m_can_start()
and m_can_stop(). Couple the polling timer with enabling/disabling of
all interrupts to achieve equivalent behavior.

Cc: Judith Mendez <jm@...com>
Fixes: b382380c0d2d ("can: m_can: Add hrtimer to generate software interrupt")
Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
---
 drivers/net/can/m_can/m_can.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 16ecc11c7f62..2395b1225cc8 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -418,6 +418,13 @@ static void m_can_config_endisable(struct m_can_classdev *cdev, bool enable)
 
 static inline void m_can_enable_all_interrupts(struct m_can_classdev *cdev)
 {
+	if (!cdev->net->irq) {
+		dev_dbg(cdev->dev, "Start hrtimer\n");
+		hrtimer_start(&cdev->hrtimer,
+			      ms_to_ktime(HRTIMER_POLL_INTERVAL_MS),
+			      HRTIMER_MODE_REL_PINNED);
+	}
+
 	/* Only interrupt line 0 is used in this driver */
 	m_can_write(cdev, M_CAN_ILE, ILE_EINT0);
 }
@@ -425,6 +432,11 @@ static inline void m_can_enable_all_interrupts(struct m_can_classdev *cdev)
 static inline void m_can_disable_all_interrupts(struct m_can_classdev *cdev)
 {
 	m_can_write(cdev, M_CAN_ILE, 0x0);
+
+	if (!cdev->net->irq) {
+		dev_dbg(cdev->dev, "Stop hrtimer\n");
+		hrtimer_cancel(&cdev->hrtimer);
+	}
 }
 
 /* Retrieve internal timestamp counter from TSCV.TSC, and shift it to 32-bit
@@ -1417,12 +1429,6 @@ static int m_can_start(struct net_device *dev)
 
 	m_can_enable_all_interrupts(cdev);
 
-	if (!dev->irq) {
-		dev_dbg(cdev->dev, "Start hrtimer\n");
-		hrtimer_start(&cdev->hrtimer, ms_to_ktime(HRTIMER_POLL_INTERVAL_MS),
-			      HRTIMER_MODE_REL_PINNED);
-	}
-
 	return 0;
 }
 
@@ -1577,11 +1583,6 @@ static void m_can_stop(struct net_device *dev)
 {
 	struct m_can_classdev *cdev = netdev_priv(dev);
 
-	if (!dev->irq) {
-		dev_dbg(cdev->dev, "Stop hrtimer\n");
-		hrtimer_cancel(&cdev->hrtimer);
-	}
-
 	/* disable all interrupts */
 	m_can_disable_all_interrupts(cdev);
 
-- 
2.40.1