can: flexcan: flexcan_chip_freeze(): fix chip freeze for missing bitrate

For cases when flexcan is built-in, bitrate is still not set at
registering. So flexcan_chip_freeze() generates:

[    1.860000] *** ZERO DIVIDE ***   FORMAT=4
[    1.860000] Current process id is 1
[    1.860000] BAD KERNEL TRAP: 00000000
[    1.860000] PC: [<402e70c8>] flexcan_chip_freeze+0x1a/0xa8

To allow chip freeze, using an hardcoded timeout when bitrate is still
not set.

Fixes: ec15e27cc890 ("can: flexcan: enable RX FIFO after FRZ/HALT valid")
Link: https://lore.kernel.org/r/20210315231510.650593-1-angelo@kernel-space.org
Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
[mkl: use if instead of ? operator]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 134c057..57f3635 100644 (file)
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -697,9 +697,15 @@ static int flexcan_chip_disable(struct flexcan_priv *priv)
 static int flexcan_chip_freeze(struct flexcan_priv *priv)
 {
        struct flexcan_regs __iomem *regs = priv->regs;
-       unsigned int timeout = 1000 * 1000 * 10 / priv->can.bittiming.bitrate;
+       unsigned int timeout;
+       u32 bitrate = priv->can.bittiming.bitrate;
        u32 reg;
 
+       if (bitrate)
+               timeout = 1000 * 1000 * 10 / bitrate;
+       else
+               timeout = FLEXCAN_TIMEOUT_US / 10;
+
        reg = priv->read(&regs->mcr);
        reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT;
        priv->write(reg, &regs->mcr);