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can: flexcan: correctly initialize mailboxes

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Apparently mailboxes may contain random data at startup, causing some of them
being prepared for message reception. This causes overruns being missed or even
confusing the IRQ check for trasmitted messages, increasing the transmit
counter instead of the error counter.

This patch initializes all mailboxes after the FIFO as RX_INACTIVE.

Signed-off-by: David Jander <david@protonic.nl>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
David Jander 2014-08-27 11:58:05 +02:00 committed by Marc Kleine-Budde
parent c32fe4ad3e
commit fc05b884a3
1 changed files with 7 additions and 0 deletions
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7
drivers/net/can/flexcan.c
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@ -812,6 +812,7 @@ static int flexcan_chip_start(struct net_device *dev)
struct flexcan_regs __iomem *regs = priv->base;
int err;
u32 reg_mcr, reg_ctrl;
int i;
/* enable module */
err = flexcan_chip_enable(priv);
@ -878,6 +879,12 @@ static int flexcan_chip_start(struct net_device *dev)
netdev_dbg(dev, "%s: writing ctrl=0x%08x", __func__, reg_ctrl);
flexcan_write(reg_ctrl, &regs->ctrl);
/* clear and invalidate all mailboxes first */
for (i = FLEXCAN_TX_BUF_ID; i < ARRAY_SIZE(regs->cantxfg); i++) {
flexcan_write(FLEXCAN_MB_CODE_RX_INACTIVE,
&regs->cantxfg[i].can_ctrl);
}
/* mark TX mailbox as INACTIVE */
flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,
&regs->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl);