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Wed, 22 Jul 2026 12:27:31 -0700 (PDT) Received: from LAPTOP-AVI.taile24b5.ts.net ([2a00:a040:1b7:4f41:5526:66e3:5bad:ba45]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47f85c7880dsm8585606f8f.37.2026.07.22.12.27.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Jul 2026 12:27:30 -0700 (PDT) From: Avi Weiss To: linux-can@vger.kernel.org Cc: Pavel Pisa , Ondrej Ille , Marc Kleine-Budde , Vincent Mailhol , Martin Jerabek , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Avi Weiss Subject: [PATCH net] can: ctucanfd: use self-test mode for PRESUME_ACK Date: Wed, 22 Jul 2026 22:27:26 +0300 Message-ID: <20260722192726.230729-1-thnkslprpt@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use self-test mode for CAN_CTRLMODE_PRESUME_ACK so transmitted frames can complete without receiving an ACK. ACK forbidden mode prevents the controller from acknowledging received frames and does not implement the presume-ack behavior. Fixes: 2dcb8e8782d8 ("can: ctucanfd: add support for CTU CAN FD open-source= IP core - bus independent part.") Signed-off-by: Avi Weiss Acked-by: Pavel Pisa --- drivers/net/can/ctucanfd/ctucanfd_base.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/can/ctucanfd/ctucanfd_base.c b/drivers/net/can/ctu= canfd/ctucanfd_base.c index 0ea1ff28dfce..8e0a606f2c84 100644 --- a/drivers/net/can/ctucanfd/ctucanfd_base.c +++ b/drivers/net/can/ctucanfd/ctucanfd_base.c @@ -340,8 +340,8 @@ static void ctucan_set_mode(struct ctucan_priv *priv, c= onst struct can_ctrlmode (mode_reg & ~REG_MODE_FDE); =20 mode_reg =3D (mode->flags & CAN_CTRLMODE_PRESUME_ACK) ? - (mode_reg | REG_MODE_ACF) : - (mode_reg & ~REG_MODE_ACF); + (mode_reg | REG_MODE_STM) : + (mode_reg & ~REG_MODE_STM); =20 mode_reg =3D (mode->flags & CAN_CTRLMODE_FD_NON_ISO) ? (mode_reg | REG_MODE_NISOFD) : --=20 2.43.0