[PATCH] m_can: fixed typo in m_can_set_bittiming() causing corrupt DBTP register content

[Hussein Alasadi <alasadi@xxxxxxxx>]

Hello everyone,

Fixed M_CAN_DBTP corrupt register contents:
* NBTP_xxx defines were being used instead of DBTP_xxx.
* reg_btp was not getting ORed with the possibly-existing DBTP_TDC flag.

------------------
Hussein Alasadi
ARECS GmbH


diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 0cffaad905c2..f3809f4cfc7b 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1168,10 +1168,10 @@ static int m_can_set_bittiming(struct net_device *dev)
                                    FIELD_PREP(TDCR_TDCO_MASK, tdco));
                }

-               reg_btp = FIELD_PREP(NBTP_NBRP_MASK, brp) |
-                         FIELD_PREP(NBTP_NSJW_MASK, sjw) |
-                         FIELD_PREP(NBTP_NTSEG1_MASK, tseg1) |
-                         FIELD_PREP(NBTP_NTSEG2_MASK, tseg2);
+               reg_btp |= FIELD_PREP(DBTP_DBRP_MASK, brp) |
+                         FIELD_PREP(DBTP_DSJW_MASK, sjw) |
+                         FIELD_PREP(DBTP_DTSEG1_MASK, tseg1) |
+                         FIELD_PREP(DBTP_DTSEG2_MASK, tseg2);

                m_can_write(cdev, M_CAN_DBTP, reg_btp);
        }