can: rockchip_canfd: add support for CAN_CTRLMODE_BERR_REPORTING

Add support for Bus Error Reporting.
Tested-by: Alibek Omarov <a1ba.omarov@gmail.com>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patch.msgid.link/20240904-rockchip-canfd-v5-20-8ae22bcb27cc@pengutronix.deSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/rockchip/rockchip_canfd-core.c

@@ -293,6 +293,12 @@ static void rkcanfd_chip_start(struct rkcanfd_priv *priv)
 		RKCANFD_REG_INT_OVERLOAD_INT |
 		RKCANFD_REG_INT_TX_FINISH_INT;
 
+	/* Do not mask the bus error interrupt if the bus error
+	 * reporting is requested.
+	 */
+	if (!(priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING))
+		priv->reg_int_mask_default |= RKCANFD_REG_INT_ERROR_INT;
+
 	memset(&priv->bec, 0x0, sizeof(priv->bec));
 
 	rkcanfd_chip_fifo_setup(priv);
@@ -533,14 +539,16 @@ static int rkcanfd_handle_error_int(struct rkcanfd_priv *priv)
 	if (!reg_ec)
 		return 0;
 
-	skb = rkcanfd_alloc_can_err_skb(priv, &cf, &timestamp);
-	if (cf) {
-		struct can_berr_counter bec;
+	if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) {
+		skb = rkcanfd_alloc_can_err_skb(priv, &cf, &timestamp);
+		if (cf) {
+			struct can_berr_counter bec;
 
-		rkcanfd_get_berr_counter_corrected(priv, &bec);
-		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR | CAN_ERR_CNT;
-		cf->data[6] = bec.txerr;
-		cf->data[7] = bec.rxerr;
+			rkcanfd_get_berr_counter_corrected(priv, &bec);
+			cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR | CAN_ERR_CNT;
+			cf->data[6] = bec.txerr;
+			cf->data[7] = bec.rxerr;
+		}
 	}
 
 	rkcanfd_handle_error_int_reg_ec(priv, cf, reg_ec);
@@ -899,7 +907,8 @@ static int rkcanfd_probe(struct platform_device *pdev)
 	priv->can.clock.freq = clk_get_rate(priv->clks[0].clk);
 	priv->can.bittiming_const = &rkcanfd_bittiming_const;
 	priv->can.data_bittiming_const = &rkcanfd_data_bittiming_const;
-	priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK;
+	priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
+		CAN_CTRLMODE_BERR_REPORTING;
 	if (!(priv->devtype_data.quirks & RKCANFD_QUIRK_CANFD_BROKEN))
 		priv->can.ctrlmode_supported |= CAN_CTRLMODE_FD;
 	priv->can.do_set_mode = rkcanfd_set_mode;