netdev - [PATCH] can: ctucanfd: fix SSP_SRC in cases when bit-rate is higher than 1 MBit.

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Message-ID: <20251231231926.20043-1-pisa@fel.cvut.cz>
Date: Thu,  1 Jan 2026 00:19:26 +0100
From: Pavel Pisa <pisa@....cvut.cz>
To: linux-can@...r.kernel.org,
	"Marc Kleine-Budde" <mkl@...gutronix.de>,
	David Laight <david.laight.linux@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Andrea Daoud <andreadaoud6@...il.com>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org
Cc: Jiri Novak <jnovak@....cvut.cz>,
	Ondrej Ille <ondrej.ille@...il.com>,
	Pavel Pisa <pisa@....cvut.cz>
Subject: [PATCH] can: ctucanfd: fix SSP_SRC in cases when bit-rate is higher than 1 MBit.

From: Ondrej Ille <ondrej.ille@...il.com>

The change has been tested on AMD/Xilinx Zynq
with the next CTU CN FD IP core versions:

 - 2.6 aka master in the "integration with Zynq-7000 system" test
   6.12.43-rt12+ #1 SMP PREEMPT_RT kernel with CTU CAN FD git
   driver (change already included in the driver repo)
 - older 2.5 snapshot with mainline kernels with this patch
   applied locally in the multiple CAN latency tester nightly runs
   6.18.0-rc4-rt3-dut #1 SMP PREEMPT_RT
   6.19.0-rc3-dut

The logs are available at

 https://canbus.pages.fel.cvut.cz/

Signed-off-by: Ondrej Ille <ondrej.ille@...il.com>
Signed-off-by: Pavel Pisa <pisa@....cvut.cz>
---
 drivers/net/can/ctucanfd/ctucanfd_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/ctucanfd/ctucanfd_base.c b/drivers/net/can/ctucanfd/ctucanfd_base.c
index 1e6b9e3dc2fe..0ea1ff28dfce 100644
--- a/drivers/net/can/ctucanfd/ctucanfd_base.c
+++ b/drivers/net/can/ctucanfd/ctucanfd_base.c
@@ -310,7 +310,7 @@ static int ctucan_set_secondary_sample_point(struct net_device *ndev)
 		}
 
 		ssp_cfg = FIELD_PREP(REG_TRV_DELAY_SSP_OFFSET, ssp_offset);
-		ssp_cfg |= FIELD_PREP(REG_TRV_DELAY_SSP_SRC, 0x1);
+		ssp_cfg |= FIELD_PREP(REG_TRV_DELAY_SSP_SRC, 0x0);
 	}
 
 	ctucan_write32(priv, CTUCANFD_TRV_DELAY, ssp_cfg);
-- 
2.47.3