linux-kernel - [PATCH can-next 05/21] can: rockchip_canfd: add quirks for errata workarounds

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Message-Id: <20240729-rockchip-canfd-v1-5-fa1250fd6be3@pengutronix.de>
Date: Mon, 29 Jul 2024 15:05:36 +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: 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 05/21] can: rockchip_canfd: add quirks for errata
 workarounds

Add a basic infrastructure for quirks for the 12 documented errata.

Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/rockchip/rockchip_canfd-core.c | 11 +++++-
 drivers/net/can/rockchip/rockchip_canfd.h      | 55 ++++++++++++++++++++++++++
 2 files changed, 64 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/rockchip/rockchip_canfd-core.c b/drivers/net/can/rockchip/rockchip_canfd-core.c
index 37183a52682b..961eae352ae4 100644
--- a/drivers/net/can/rockchip/rockchip_canfd-core.c
+++ b/drivers/net/can/rockchip/rockchip_canfd-core.c
@@ -26,6 +26,12 @@
 
 static const struct rkcanfd_devtype_data rkcanfd_devtype_data_rk3568v2 = {
 	.model = RKCANFD_MODEL_RK3568V2,
+	.quirks = RKCANFD_QUIRK_RK3568_ERRATUM_1 | RKCANFD_QUIRK_RK3568_ERRATUM_2 |
+		RKCANFD_QUIRK_RK3568_ERRATUM_3 | RKCANFD_QUIRK_RK3568_ERRATUM_4 |
+		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,
 };
 
 static const char *__rkcanfd_get_model_str(enum rkcanfd_model model)
@@ -712,10 +718,11 @@ static void rkcanfd_register_done(const struct rkcanfd_priv *priv)
 	dev_id = rkcanfd_read(priv, RKCANFD_REG_RTL_VERSION);
 
 	netdev_info(priv->ndev,
-		    "Rockchip-CANFD %s rev%lu.%lu found\n",
+		    "Rockchip-CANFD %s rev%lu.%lu (errata 0x%04x) found\n",
 		    rkcanfd_get_model_str(priv),
 		    FIELD_GET(RKCANFD_REG_RTL_VERSION_MAJOR, dev_id),
-		    FIELD_GET(RKCANFD_REG_RTL_VERSION_MINOR, dev_id));
+		    FIELD_GET(RKCANFD_REG_RTL_VERSION_MINOR, dev_id),
+		    priv->devtype_data.quirks);
 }
 
 static int rkcanfd_register(struct rkcanfd_priv *priv)
diff --git a/drivers/net/can/rockchip/rockchip_canfd.h b/drivers/net/can/rockchip/rockchip_canfd.h
index ad068c08a44e..b267df438a82 100644
--- a/drivers/net/can/rockchip/rockchip_canfd.h
+++ b/drivers/net/can/rockchip/rockchip_canfd.h
@@ -294,12 +294,67 @@
 #define RKCANFD_TIMESTAMP_WORK_MAX_DELAY_SEC 60
 #define RKCANFD_ERRATUM_5_SYSCLOCK_HZ_MIN (300 * MEGA)
 
+/* rk3568 CAN-FD Errata, as of Tue 07 Nov 2023 11:25:31 +08:00 */
+
+/* Erratum 1: The error frame sent by the CAN controller has an
+ * abnormal format.
+ */
+#define RKCANFD_QUIRK_RK3568_ERRATUM_1 BIT(0)
+
+/* Erratum 2: The error frame sent after detecting a CRC error has an
+ * abnormal position.
+ */
+#define RKCANFD_QUIRK_RK3568_ERRATUM_2 BIT(1)
+
+/* Erratum 3: Intermittent CRC calculation errors. */
+#define RKCANFD_QUIRK_RK3568_ERRATUM_3 BIT(2)
+
+/* Erratum 4: Intermittent occurrence of stuffing errors. */
+#define RKCANFD_QUIRK_RK3568_ERRATUM_4 BIT(3)
+
+/* Erratum 5: Counters related to the TXFIFO and RXFIFO exhibit
+ * abnormal counting behavior.
+ */
+#define RKCANFD_QUIRK_RK3568_ERRATUM_5 BIT(4)
+
+/* Erratum 6: The CAN controller's transmission of extended frames may
+ * intermittently change into standard frames
+ */
+#define RKCANFD_QUIRK_RK3568_ERRATUM_6 BIT(5)
+
+/* Erratum 7: In the passive error state, the CAN controller's
+ * interframe space segment counting is inaccurate.
+ */
+#define RKCANFD_QUIRK_RK3568_ERRATUM_7 BIT(6)
+
+/* Erratum 8: The Format-Error error flag is transmitted one bit
+ * later.
+ */
+#define RKCANFD_QUIRK_RK3568_ERRATUM_8 BIT(7)
+
+/* Erratum 9: In the arbitration segment, the CAN controller will
+ * identify stuffing errors as arbitration failures.
+ */
+#define RKCANFD_QUIRK_RK3568_ERRATUM_9 BIT(8)
+
+/* Erratum 10: Does not support the BUSOFF slow recovery mechanism. */
+#define RKCANFD_QUIRK_RK3568_ERRATUM_10 BIT(9)
+
+/* Erratum 11: Arbitration error. */
+#define RKCANFD_QUIRK_RK3568_ERRATUM_11 BIT(10)
+
+/* Erratum 12: A dominant bit at the third bit of the intermission may
+ * cause a transmission error.
+ */
+#define RKCANFD_QUIRK_RK3568_ERRATUM_12 BIT(11)
+
 enum rkcanfd_model {
 	RKCANFD_MODEL_RK3568V2 = 0x35682,
 };
 
 struct rkcanfd_devtype_data {
 	enum rkcanfd_model model;
+	u32 quirks;
 };
 
 struct rkcanfd_fifo_header {

-- 
2.43.0