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can: m_can: Batch acknowledge transmit events 

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>
Link: https://lore.kernel.org/all/20221206115728.1056014-7-msp@baylibre.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Markus Schneider-Pargmann 2022-12-06 12:57:23 +01:00 committed by Marc Kleine-Budde
parent 6355a3c983
commit e3bff5256a
1 changed files with 9 additions and 6 deletions
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15
drivers/net/can/m_can/m_can.c
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@ -1023,7 +1023,9 @@ 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);
@ -1038,28 +1040,29 @@ 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)