can: m_can: m_can_chip_config(): actually enable internal timestamping

In commit df06fd6 ("can: m_can: m_can_chip_config(): enable and
configure internal timestamps") the timestamping in the m_can core
should be enabled. In peripheral mode, the RX'ed CAN frames, TX
compete frames and error events are sorted by the timestamp.

The above mentioned commit however forgot to enable the timestamping.
Add the missing bits to enable the timestamp counter to the write of
the Timestamp Counter Configuration register.

Link: https://lore.kernel.org/all/[email protected]
Fixes: df06fd6 ("can: m_can: m_can_chip_config(): enable and configure internal timestamps")
Cc: <[email protected]> # 5.13
Cc: Torin Cooper-Bennun <[email protected]>
Reviewed-by: Chandrasekar Ramakrishnan <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>

drivers/net/can/m_can/m_can.c

@@ -1351,7 +1351,9 @@ static void m_can_chip_config(struct net_device *dev)
 	/* enable internal timestamp generation, with a prescalar of 16. The
 	 * prescalar is applied to the nominal bit timing
 	 */
-	m_can_write(cdev, M_CAN_TSCC, FIELD_PREP(TSCC_TCP_MASK, 0xf));
+	m_can_write(cdev, M_CAN_TSCC,
+		    FIELD_PREP(TSCC_TCP_MASK, 0xf) |
+		    FIELD_PREP(TSCC_TSS_MASK, TSCC_TSS_INTERNAL));
 
 	m_can_config_endisable(cdev, false);