linux-kernel - [PATCH can-next v2 20/20] can: rockchip_canfd: add support for CAN_CTRLMODE_BERR

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Message-Id: <20240731-rockchip-canfd-v2-20-d9604c5b4be8@pengutronix.de>
Date: Wed, 31 Jul 2024 11:37:22 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: kernel@...gutronix.de, Vincent Mailhol <mailhol.vincent@...adoo.fr>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>, 
 Philipp Zabel <p.zabel@...gutronix.de>, 
 Elaine Zhang <zhangqing@...k-chips.com>, 
 David Jander <david.jander@...tonic.nl>
Cc: Simon Horman <horms@...nel.org>, linux-can@...r.kernel.org, 
 netdev@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH can-next v2 20/20] can: rockchip_canfd: add support for
 CAN_CTRLMODE_BERR_REPORTING

Add support for Bus Error Reporting.

Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/rockchip/rockchip_canfd-core.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/net/can/rockchip/rockchip_canfd-core.c b/drivers/net/can/rockchip/rockchip_canfd-core.c
index 2d6eca8d23be..6daaee7dfe56 100644
--- a/drivers/net/can/rockchip/rockchip_canfd-core.c
+++ b/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);
@@ -902,7 +910,8 @@ 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;

-- 
2.43.0