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can: c_can: Avoid status register update for D_CAN

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On D_CAN the RXOK, TXOK and LEC bits are cleared/set on read of the
status register. No need to update them.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Thomas Gleixner 2014-04-11 08:13:15 +00:00 committed by Marc Kleine-Budde
parent 6b48ff8d93
commit b9011aae93
1 changed files with 6 additions and 3 deletions
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9
drivers/net/can/c_can/c_can.c
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@ -1041,7 +1041,8 @@ static int c_can_handle_bus_err(struct net_device *dev,
}
/* set a `lec` value so that we can check for updates later */
priv->write_reg(priv, C_CAN_STS_REG, LEC_UNUSED);
if (priv->type != BOSCH_D_CAN)
priv->write_reg(priv, C_CAN_STS_REG, LEC_UNUSED);
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
@ -1066,11 +1067,13 @@ static int c_can_poll(struct napi_struct *napi, int quota)
C_CAN_STS_REG);
/* handle Tx/Rx events */
if (priv->current_status & STATUS_TXOK)
if (priv->current_status & STATUS_TXOK &&
priv->type != BOSCH_D_CAN)
priv->write_reg(priv, C_CAN_STS_REG,
priv->current_status & ~STATUS_TXOK);
if (priv->current_status & STATUS_RXOK)
if (priv->current_status & STATUS_RXOK &&
priv->type != BOSCH_D_CAN)
priv->write_reg(priv, C_CAN_STS_REG,
priv->current_status & ~STATUS_RXOK);