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[221.245.252.90]) by smtp.gmail.com with ESMTPSA id x13-20020aa79a4d000000b0056ba7cda4b5sm1399420pfj.16.2022.11.24.07.25.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Nov 2022 07:25:12 -0800 (PST) From: Yasushi SHOJI X-Google-Original-From: Yasushi SHOJI To: Yasushi SHOJI , Wolfgang Grandegger , Marc Kleine-Budde , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: remigiusz.kollataj@mobica.com, linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2] can: mcba_usb: Fix termination command argument Date: Fri, 25 Nov 2022 00:25:03 +0900 Message-Id: <20221124152504.125994-1-yashi@spacecubics.com> X-Mailer: git-send-email 2.38.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Microchip USB Analyzer can activate the internal termination resistors by setting the "termination" option ON, or OFF to to deactivate them. As I've observed, both with my oscilloscope and captured USB packets below, you must send "0" to turn it ON, and "1" to turn it OFF. From the schematics in the user's guide, I can confirm that you must drive the CAN_RES signal LOW "0" to activate the resistors. Reverse the argument value of usb_msg.termination to fix this. These are the two commands sequence, ON then OFF. > No. Time Source Destination Protoc= ol Length Info > 1 0.000000 host 1.3.1 USB = 46 URB_BULK out > > Frame 1: 46 bytes on wire (368 bits), 46 bytes captured (368 bits) > USB URB > Leftover Capture Data: a80000000000000000000000000000000000a8 > > No. Time Source Destination Protoc= ol Length Info > 2 4.372547 host 1.3.1 USB = 46 URB_BULK out > > Frame 2: 46 bytes on wire (368 bits), 46 bytes captured (368 bits) > USB URB > Leftover Capture Data: a80100000000000000000000000000000000a9 Signed-off-by: Yasushi SHOJI --- drivers/net/can/usb/mcba_usb.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/net/can/usb/mcba_usb.c b/drivers/net/can/usb/mcba_usb.c index 218b098b261d..47619e9cb005 100644 --- a/drivers/net/can/usb/mcba_usb.c +++ b/drivers/net/can/usb/mcba_usb.c @@ -47,6 +47,10 @@ #define MCBA_VER_REQ_USB 1 #define MCBA_VER_REQ_CAN 2 =20 +/* Drive the CAN_RES signal LOW "0" to activate R24 and R25 */ +#define MCBA_VER_TERMINATION_ON 0 +#define MCBA_VER_TERMINATION_OFF 1 + #define MCBA_SIDL_EXID_MASK 0x8 #define MCBA_DLC_MASK 0xf #define MCBA_DLC_RTR_MASK 0x40 @@ -463,7 +467,7 @@ static void mcba_usb_process_ka_usb(struct mcba_priv *p= riv, priv->usb_ka_first_pass =3D false; } =20 - if (msg->termination_state) + if (msg->termination_state =3D=3D MCBA_VER_TERMINATION_ON) priv->can.termination =3D MCBA_TERMINATION_ENABLED; else priv->can.termination =3D MCBA_TERMINATION_DISABLED; @@ -785,9 +789,9 @@ static int mcba_set_termination(struct net_device *netd= ev, u16 term) }; =20 if (term =3D=3D MCBA_TERMINATION_ENABLED) - usb_msg.termination =3D 1; + usb_msg.termination =3D MCBA_VER_TERMINATION_ON; else - usb_msg.termination =3D 0; + usb_msg.termination =3D MCBA_VER_TERMINATION_OFF; =20 mcba_usb_xmit_cmd(priv, (struct mcba_usb_msg *)&usb_msg); =20 --=20 2.38.1