From: Markus Schneider-Pargmann <msp@baylibre.com>
To: Chandrasekar Ramakrishnan <rcsekar@samsung.com>,
Marc Kleine-Budde <mkl@pengutronix.de>,
Wolfgang Grandegger <wg@grandegger.com>
Cc: linux-can@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
Markus Schneider-Pargmann <msp@baylibre.com>
Subject: [PATCH v2 06/11] can: m_can: Batch acknowledge transmit events
Date: Tue, 6 Dec 2022 12:57:23 +0100 [thread overview]
Message-ID: <20221206115728.1056014-7-msp@baylibre.com> (raw)
In-Reply-To: <20221206115728.1056014-1-msp@baylibre.com>
Transmit events from the txe fifo can be batch acknowledged by
acknowledging the last read txe fifo item. This will save txe_count
writes which is important for peripheral chips.
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
---
drivers/net/can/m_can/m_can.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index a0ae543d418c..5572a6b3b94c 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1013,7 +1013,9 @@ static int m_can_echo_tx_event(struct net_device *dev)
u32 txe_count = 0;
u32 m_can_txefs;
u32 fgi = 0;
+ int ack_fgi = -1;
int i = 0;
+ int err = 0;
unsigned int msg_mark;
struct m_can_classdev *cdev = netdev_priv(dev);
@@ -1028,28 +1030,29 @@ static int m_can_echo_tx_event(struct net_device *dev)
/* Get and process all sent elements */
for (i = 0; i < txe_count; i++) {
u32 txe, timestamp = 0;
- int err;
/* get message marker, timestamp */
err = m_can_txe_fifo_read(cdev, fgi, 4, &txe);
if (err) {
netdev_err(dev, "TXE FIFO read returned %d\n", err);
- return err;
+ break;
}
msg_mark = FIELD_GET(TX_EVENT_MM_MASK, txe);
timestamp = FIELD_GET(TX_EVENT_TXTS_MASK, txe) << 16;
- /* ack txe element */
- m_can_write(cdev, M_CAN_TXEFA, FIELD_PREP(TXEFA_EFAI_MASK,
- fgi));
+ ack_fgi = fgi;
fgi = (++fgi >= cdev->mcfg[MRAM_TXE].num ? 0 : fgi);
/* update stats */
m_can_tx_update_stats(cdev, msg_mark, timestamp);
}
- return 0;
+ if (ack_fgi != -1)
+ m_can_write(cdev, M_CAN_TXEFA, FIELD_PREP(TXEFA_EFAI_MASK,
+ ack_fgi));
+
+ return err;
}
static irqreturn_t m_can_isr(int irq, void *dev_id)
--
2.38.1
next prev parent reply other threads:[~2022-12-06 11:58 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-06 11:57 [PATCH v2 00/11] can: m_can: Optimizations for tcan and peripheral chips Markus Schneider-Pargmann
2022-12-06 11:57 ` [PATCH v2 01/11] can: m_can: Eliminate double read of TXFQS in tx_handler Markus Schneider-Pargmann
2022-12-06 11:57 ` [PATCH v2 02/11] can: m_can: Avoid reading irqstatus twice Markus Schneider-Pargmann
2022-12-06 11:57 ` [PATCH v2 03/11] can: m_can: Read register PSR only on error Markus Schneider-Pargmann
2022-12-06 11:57 ` [PATCH v2 04/11] can: m_can: Count TXE FIFO getidx in the driver Markus Schneider-Pargmann
2022-12-06 11:57 ` [PATCH v2 05/11] can: m_can: Count read getindex " Markus Schneider-Pargmann
2022-12-06 11:57 ` Markus Schneider-Pargmann [this message]
2022-12-06 11:57 ` [PATCH v2 07/11] can: m_can: Batch acknowledge rx fifo Markus Schneider-Pargmann
2022-12-06 11:57 ` [PATCH v2 08/11] can: tcan4x5x: Remove invalid write in clear_interrupts Markus Schneider-Pargmann
2022-12-06 11:57 ` [PATCH v2 09/11] can: tcan4x5x: Fix use of register error status mask Markus Schneider-Pargmann
2022-12-06 11:57 ` [PATCH v2 10/11] can: tcan4x5x: Fix register range of first two blocks Markus Schneider-Pargmann
2022-12-06 11:57 ` [PATCH v2 11/11] can: tcan4x5x: Specify separate read/write ranges Markus Schneider-Pargmann
2022-12-06 16:20 ` Marc Kleine-Budde
2022-12-12 10:54 ` Marc Kleine-Budde
2022-12-13 17:10 ` Markus Schneider-Pargmann
2022-12-13 19:10 ` Markus Schneider-Pargmann
2022-12-13 19:13 ` Marc Kleine-Budde
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