netdev - [PATCH can-next v3 06/20] can: rockchip_canfd: add quirk for broken CAN-FD support

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Message-Id: <20240830-rockchip-canfd-v3-6-d426266453fa@pengutronix.de>
Date: Fri, 30 Aug 2024 21:26:03 +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 v3 06/20] can: rockchip_canfd: add quirk for
 broken CAN-FD support

The errata sheets doesn't say anything about CAN-FD, but tests on the
rk3568v2 and rk3568v3 show that receiving certain CAN-FD frames
triggers an Error Interrupt.

Mark the CAN-FD support as broken.

Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/rockchip/rockchip_canfd-core.c |  5 ++++-
 drivers/net/can/rockchip/rockchip_canfd.h      | 21 +++++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/rockchip/rockchip_canfd-core.c b/drivers/net/can/rockchip/rockchip_canfd-core.c
index 18957769b3d3..61de6f89cf16 100644
--- a/drivers/net/can/rockchip/rockchip_canfd-core.c
+++ b/drivers/net/can/rockchip/rockchip_canfd-core.c
@@ -31,7 +31,8 @@ static const struct rkcanfd_devtype_data rkcanfd_devtype_data_rk3568v2 = {
 		RKCANFD_QUIRK_RK3568_ERRATUM_5 | RKCANFD_QUIRK_RK3568_ERRATUM_6 |
 		RKCANFD_QUIRK_RK3568_ERRATUM_7 | RKCANFD_QUIRK_RK3568_ERRATUM_8 |
 		RKCANFD_QUIRK_RK3568_ERRATUM_9 | RKCANFD_QUIRK_RK3568_ERRATUM_10 |
-		RKCANFD_QUIRK_RK3568_ERRATUM_11 | RKCANFD_QUIRK_RK3568_ERRATUM_12,
+		RKCANFD_QUIRK_RK3568_ERRATUM_11 | RKCANFD_QUIRK_RK3568_ERRATUM_12 |
+		RKCANFD_QUIRK_CANFD_BROKEN,
 };

 static const char *__rkcanfd_get_model_str(enum rkcanfd_model model)
@@ -817,6 +818,8 @@ static int rkcanfd_probe(struct platform_device *pdev)
 	priv->can.bittiming_const = &rkcanfd_bittiming_const;
 	priv->can.data_bittiming_const = &rkcanfd_data_bittiming_const;
 	priv->can.ctrlmode_supported = 0;
+	if (!(priv->devtype_data.quirks & RKCANFD_QUIRK_CANFD_BROKEN))
+		priv->can.ctrlmode_supported |= CAN_CTRLMODE_FD;
 	priv->can.do_set_mode = rkcanfd_set_mode;
 	priv->can.do_get_berr_counter = rkcanfd_get_berr_counter;
 	priv->ndev = ndev;
diff --git a/drivers/net/can/rockchip/rockchip_canfd.h b/drivers/net/can/rockchip/rockchip_canfd.h
index 09626ca174a8..7321027534fb 100644
--- a/drivers/net/can/rockchip/rockchip_canfd.h
+++ b/drivers/net/can/rockchip/rockchip_canfd.h
@@ -349,6 +349,27 @@
  */
 #define RKCANFD_QUIRK_RK3568_ERRATUM_12 BIT(11)

+/* Tests on the rk3568v2 and rk3568v3 show that receiving certain
+ * CAN-FD frames trigger an Error Interrupt.
+ *
+ * - Form Error in RX Arbitration Phase: TX_IDLE RX_STUFF_COUNT (0x0a010100) CMD=0 RX=0 TX=0
+ *   Error-Warning=1 Bus-Off=0
+ *   To reproduce:
+ *   host:
+ *     cansend can0 002##01f
+ *   DUT:
+ *     candump any,0:0,#FFFFFFFF -cexdHtA
+ *
+ * - Form Error in RX Arbitration Phase: TX_IDLE RX_CRC (0x0a010200) CMD=0 RX=0 TX=0
+ *   Error-Warning=1 Bus-Off=0
+ *   To reproduce:
+ *   host:
+ *     cansend can0 002##07217010000000000
+ *   DUT:
+ *     candump any,0:0,#FFFFFFFF -cexdHtA
+ */
+#define RKCANFD_QUIRK_CANFD_BROKEN BIT(12)
+
 enum rkcanfd_model {
 	RKCANFD_MODEL_RK3568V2 = 0x35682,
 };

-- 
2.45.2