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Message-Id: <20240903-rockchip-canfd-v4-13-1dc3f3f32856@pengutronix.de>
Date: Tue, 03 Sep 2024 11:21:55 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: kernel@...gutronix.de, Alibek Omarov <a1ba.omarov@...il.com>,
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 v4 13/20] can: rockchip_canfd: implement
workaround for erratum 12
The rk3568 CAN-FD errata sheet as of Tue 07 Nov 2023 11:25:31 +08:00
says:
| A dominant bit at the third bit of the intermission may cause a
| transmission error.
|
| When sampling the third bit of the intermission as a dominant bit, if
| tx_req is configured to transmit extended frames at this time, the
| extended frame may be sent to the bus in the format of a standard
| frame. The extended frame will be sent as a standard frame and will not
| result in error frames
Turn on "Interframe Spaceing RX Mode" only during TX to work around
erratum 12, according to rock-chip:
| Spaceing RX Mode = 1, the third Bit between frames cannot receive
| and send, and the fourth Bit begins to receive and send.
|
| Spaceing RX Mode = 0, allowing the third Bit between frames to
| receive and send.
Message-ID: <be72939f-0a9e-0608-dfff-7b0096a26eba@...k-chips.com>
Tested-by: Alibek Omarov <a1ba.omarov@...il.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
drivers/net/can/rockchip/rockchip_canfd-tx.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/net/can/rockchip/rockchip_canfd-tx.c b/drivers/net/can/rockchip/rockchip_canfd-tx.c
index e98e7a836b83..9db6d90a4e7f 100644
--- a/drivers/net/can/rockchip/rockchip_canfd-tx.c
+++ b/drivers/net/can/rockchip/rockchip_canfd-tx.c
@@ -11,7 +11,14 @@
static void rkcanfd_start_xmit_write_cmd(const struct rkcanfd_priv *priv,
const u32 reg_cmd)
{
+ if (priv->devtype_data.quirks & RKCANFD_QUIRK_RK3568_ERRATUM_12)
+ rkcanfd_write(priv, RKCANFD_REG_MODE, priv->reg_mode_default |
+ RKCANFD_REG_MODE_SPACE_RX_MODE);
+
rkcanfd_write(priv, RKCANFD_REG_CMD, reg_cmd);
+
+ if (priv->devtype_data.quirks & RKCANFD_QUIRK_RK3568_ERRATUM_12)
+ rkcanfd_write(priv, RKCANFD_REG_MODE, priv->reg_mode_default);
}
void rkcanfd_xmit_retry(struct rkcanfd_priv *priv)
--
2.45.2
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