can: c_can: Avoid status register update for D_CAN
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>
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@ -1041,7 +1041,8 @@ static int c_can_handle_bus_err(struct net_device *dev,
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}
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/* set a `lec` value so that we can check for updates later */
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priv->write_reg(priv, C_CAN_STS_REG, LEC_UNUSED);
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if (priv->type != BOSCH_D_CAN)
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priv->write_reg(priv, C_CAN_STS_REG, LEC_UNUSED);
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stats->rx_packets++;
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stats->rx_bytes += cf->can_dlc;
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@ -1066,11 +1067,13 @@ static int c_can_poll(struct napi_struct *napi, int quota)
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C_CAN_STS_REG);
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/* handle Tx/Rx events */
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if (priv->current_status & STATUS_TXOK)
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if (priv->current_status & STATUS_TXOK &&
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priv->type != BOSCH_D_CAN)
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priv->write_reg(priv, C_CAN_STS_REG,
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priv->current_status & ~STATUS_TXOK);
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if (priv->current_status & STATUS_RXOK)
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if (priv->current_status & STATUS_RXOK &&
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priv->type != BOSCH_D_CAN)
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priv->write_reg(priv, C_CAN_STS_REG,
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priv->current_status & ~STATUS_RXOK);
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