pch_can: Fix bit timing calculation issue

Modify like use calculated value directly passed by CAN core module.

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
index 3540978..5a6a0df 100644 (file)
--- a/drivers/net/can/pch_can.c
+++ b/drivers/net/can/pch_can.c
@@ -786,17 +786,15 @@ static int pch_set_bittiming(struct net_device *ndev)
        const struct can_bittiming *bt = &priv->can.bittiming;
        u32 canbit;
        u32 bepe;
-       u32 brp;
 
        /* Setting the CCE bit for accessing the Can Timing register. */
        pch_can_bit_set(&priv->regs->cont, PCH_CTRL_CCE);
 
-       brp = (bt->tq) / (1000000000/PCH_CAN_CLK) - 1;
-       canbit = brp & PCH_MSK_BITT_BRP;
+       canbit = (bt->brp - 1) & PCH_MSK_BITT_BRP;
        canbit |= (bt->sjw - 1) << PCH_BIT_SJW_SHIFT;
        canbit |= (bt->phase_seg1 + bt->prop_seg - 1) << PCH_BIT_TSEG1_SHIFT;
        canbit |= (bt->phase_seg2 - 1) << PCH_BIT_TSEG2_SHIFT;
-       bepe = (brp & PCH_MSK_BRPE_BRPE) >> PCH_BIT_BRPE_BRPE_SHIFT;
+       bepe = ((bt->brp - 1) & PCH_MSK_BRPE_BRPE) >> PCH_BIT_BRPE_BRPE_SHIFT;
        iowrite32(canbit, &priv->regs->bitt);
        iowrite32(bepe, &priv->regs->brpe);
        pch_can_bit_clear(&priv->regs->cont, PCH_CTRL_CCE);