From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfgang Grandegger Subject: Re: [PATCH v2 2/2] can: spi: hi311x: Add Holt HI-311x CAN driver Date: Tue, 14 Mar 2017 22:23:56 +0100 Message-ID: References: <1484680922-25813-1-git-send-email-akshay.bhat@timesys.com> <1484680922-25813-2-git-send-email-akshay.bhat@timesys.com> <234d9e75-0083-b8b4-c781-add653fdb550@grandegger.com> <3dbf8748-9d04-0f21-0e95-448d7a72e7d5@timesys.com> <41439729-42d0-d883-2801-2d3607f2aeab@grandegger.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <41439729-42d0-d883-2801-2d3607f2aeab@grandegger.com> Sender: linux-kernel-owner@vger.kernel.org To: Akshay Bhat , mkl@pengutronix.de Cc: linux-can@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Akshay Bhat List-Id: linux-can.vger.kernel.org Am 14.03.2017 um 19:08 schrieb Wolfgang Grandegger: > Hello Akshay, > > Am 14.03.2017 um 17:20 schrieb Akshay Bhat: >> >> Hi Wolfgang, >> >> On 03/14/2017 08:11 AM, Wolfgang Grandegger wrote: >>> ... snip ... >>>>> A few other things to check: >>>>> >>>>> Run "cangen" and monitor the message with "candump -e >>>>> any,0:0,#FFFFFFF". >>>>> Then 1) disconnect the cable or 2) short-circuit CAN low and high >>>>> at the >>>>> connector. You should see error messages. After reconnection or >>>>> removing >>>>> the short-circuit (and bus-off recovery) the state should go back to >>>>> "active". >>>>> >>>> >>>> With the above sequence, candump reports "ERRORFRAME" with >>>> protocol-violation{{}{acknowledge-slot}}, bus-error. On re-connecting >>>> the cable the can state goes back to ACTIVE and I see the messages that >>>> were in the queue being sent. >>> >>> Do you get the ACK error also with berr-reporting off? Would be nice if >>> you could show a candump log here. >>> >> >> Below is a log for disconnecting and re-connecting CAN cable scenario: >> (Note this is on a 4.1.18 kernel with RT patch) >> >> root@imx6qrom5420b1:~# ip link set can0 up type can bitrate 1000000 >> berr-reporting on >> root@imx6qrom5420b1:~# candump -e any,0:0,#FFFFFFF & > > Please add "-td" ... > >> [1] 768 >> root@imx6qrom5420b1:~# cangen can0 > > and "-i" here. > >> can0 21C [8] 35 98 C0 7A 95 03 E6 2A >> can0 6E6 [1] F2 >> can0 5C7 [2] 42 50 >> can0 57C [8] 83 7A E4 0C 03 8B 90 45 >> can0 55C [8] B9 74 87 52 D8 F4 64 04 >> can0 014 [8] 28 CB 96 57 3B 80 67 4F >> can0 6AF [1] 35 >> can0 51E [8] B6 C8 6C 1D 3A 87 ED 2E >> can0 527 [8] D0 8A D3 59 0E 34 40 78 >> can0 30C [2] 6A 12 >> can0 145 [8] CB 6E FF 55 C1 BE C3 22 >> can0 5A5 [8] C4 49 54 68 02 63 F9 35 >> can0 0BA [8] DA 57 5E 3A CE 88 20 1C >> can0 516 [2] 09 09 >> can0 743 [8] 7C 4D 25 47 61 4C 56 3D >> can0 31D [2] 9C D3 >> can0 71E [8] 53 7C 97 2A 2A F2 9F 56 >> can0 52E [8] FE DA 2D 51 73 96 DF 79 >> /////disconnect cable >> can0 20000088 [8] 00 00 00 19 00 00 28 00 ERRORFRAME >> protocol-violation{{}{acknowledge-slot}} >> bus-error >> error-counter-tx-rx{{40}{0}} >> can0 20000088 [8] 00 00 00 19 00 00 58 00 ERRORFRAME >> protocol-violation{{}{acknowledge-slot}} >> bus-error >> error-counter-tx-rx{{88}{0}} >> can0 20000088 [8] 00 00 00 19 00 00 80 00 ERRORFRAME >> protocol-violation{{}{acknowledge-slot}} >> bus-error >> error-counter-tx-rx{{128}{0}} > > TX error warning is missing. > >> can0 2000008C [8] 00 20 00 19 00 00 80 00 ERRORFRAME >> controller-problem{tx-error-passive} >> protocol-violation{{}{acknowledge-slot}} >> bus-error >> error-counter-tx-rx{{128}{0}} > > Here "tx-error-passiv" is packed with a bus error. What I'm looking for > are state change messages similar to: > > can0 20000204 [8] 00 08 00 00 00 00 60 00 ERRORFRAME > controller-problem{tx-error-warning} > state-change{tx-error-warning} > error-counter-tx-rx{{96}{0}} > can0 20000204 [8] 00 30 00 00 00 00 80 00 ERRORFRAME > controller-problem{tx-error-passive} > state-change{tx-error-passive} > error-counter-tx-rx{{128}{0} > > They should always come, even with "berr-reporting off". > >> write: No buffer space available >> root@imx6qrom5420b1:~# ip -s -d link show can0 >> 4: can0: mtu 16 qdisc pfifo_fast state UNKNOWN >> mode DEFAULT group default qlen 10 >> link/can promiscuity 0 >> can state ERROR-PASSIVE (berr-counter tx 128 rx 0) >> restart-ms 0 >> bitrate 1000000 sample-point 0.750 >> tq 62 prop-seg 5 phase-seg1 6 phase-seg2 4 sjw 1 >> hi3110: tseg1 2..16 tseg2 2..8 sjw 1..4 brp 1..64 brp-inc 1 >> clock 16000000 >> re-started bus-errors arbit-lost error-warn error-pass bus-off >> 0 6 0 1 1 0 > > The error warning and passive counter increased , though. Also the bus > error should come in at a rather hight rate. Looking to the code, maybe > you need to test STATF to check for state changes (and not ERR). Likely the ERR bits are only valid if the BUSERR bit in INTF is set. >> RX: bytes packets errors dropped overrun mcast >> 0 0 6 0 0 0 >> TX: bytes packets errors dropped carrier collsns >> 106 18 0 0 0 0 >> root@imx6qrom5420b1:~# >> /////re-connect cable >> can0 169 [8] 35 55 A3 1C 0F 47 2E 5B >> can0 318 [8] 11 AA 27 11 D2 1B CE 34 >> can0 577 [8] A0 A4 EE 50 8D A2 E1 3E >> can0 4ED [8] 52 96 17 7E 31 FC 7D 7C >> can0 2E7 [8] 92 48 D4 39 05 1E 9F 50 >> can0 200 [8] 4A 66 F6 02 1E 71 8E 26 >> can0 29A [8] 49 63 2E 7D C9 77 85 7A >> can0 15A [7] 3C 0E 65 74 C3 62 80 >> can0 011 [1] D2 >> can0 26B [3] FC D6 68 >> can0 5CE [8] 6F 02 B5 14 BC 7A D7 02 >> >> root@imx6qrom5420b1:~# ip -s -d link show can0 >> 4: can0: mtu 16 qdisc pfifo_fast state UNKNOWN >> mode DEFAULT group default qlen 10 >> link/can promiscuity 0 >> can state ERROR-ACTIVE (berr-counter tx 117 rx 0) >> restart-ms 0 >> bitrate 1000000 sample-point 0.750 >> tq 62 prop-seg 5 phase-seg1 6 phase-seg2 4 sjw 1 >> hi3110: tseg1 2..16 tseg2 2..8 sjw 1..4 brp 1..64 brp-inc 1 >> clock 16000000 >> re-started bus-errors arbit-lost error-warn error-pass bus-off >> 0 7 0 1 1 0 >> RX: bytes packets errors dropped overrun mcast >> 0 0 7 0 0 0 >> TX: bytes packets errors dropped carrier collsns >> 181 29 0 0 0 0 >> >> >> //Reboot the board and test with bus error reporting off >> >> root@imx6qrom5420b1:~# ip link set can0 up type can bitrate 1000000 >> berr-reporting off >> root@imx6qrom5420b1:~# candump -e any,0:0,#FFFFFFF & >> [1] 782 >> root@imx6qrom5420b1:~# cangen can0 >> can0 1FA [3] C9 FE C2 >> can0 3E2 [5] 85 37 03 5B 6F >> can0 289 [8] A4 F6 BF 4A 3F 70 65 1B >> can0 12D [8] B2 72 10 33 AB B4 68 64 >> can0 054 [2] 01 D7 >> can0 4A6 [8] 29 7D 76 56 CA C1 60 00 >> can0 768 [8] 97 3D 92 08 61 C1 D9 03 >> can0 098 [6] A4 A8 5A 60 92 1A >> can0 3C9 [8] 71 78 0D 25 AB 27 8B 51 >> /////disconnect cable >> write: No buffer space available >> root@imx6qrom5420b1:~# ip -s -d link show can0 >> 4: can0: mtu 16 qdisc pfifo_fast state UNKNOWN >> mode DEFAULT group default qlen 10 >> link/can promiscuity 0 >> can state ERROR-ACTIVE (berr-counter tx 128 rx 0) restart-ms 0 >> bitrate 1000000 sample-point 0.750 >> tq 62 prop-seg 5 phase-seg1 6 phase-seg2 4 sjw 1 >> hi3110: tseg1 2..16 tseg2 2..8 sjw 1..4 brp 1..64 brp-inc 1 >> clock 16000000 >> re-started bus-errors arbit-lost error-warn error-pass bus-off >> 0 0 0 0 0 0 >> RX: bytes packets errors dropped overrun mcast >> 0 0 0 0 0 0 >> TX: bytes packets errors dropped carrier collsns >> 56 9 0 0 0 0 >> root@imx6qrom5420b1:~# >> /////re-connect cable >> can0 20000088 [8] 00 00 00 19 00 00 7F 00 ERRORFRAME >> protocol-violation{{}{acknowledge-slot}} >> bus-error >> error-counter-tx-rx{{127}{0}} >> can0 553 [6] 1A E4 60 6B DC 07 >> can0 7E3 [8] 1C 78 95 6E 10 81 AA 40 >> can0 20C [8] BB 35 13 25 60 0A 56 57 >> can0 1D0 [8] 48 4A 39 64 76 E6 57 08 >> can0 43A [1] 40 >> can0 2CF [7] 03 45 5E 0F 67 33 4C >> can0 1CD [8] F9 4D AB 1D 96 A5 67 0E >> can0 515 [8] 41 CD F2 5F 68 92 43 16 >> can0 661 [8] 45 9A 73 69 45 EE 8B 42 >> can0 41B [1] 55 >> can0 52F [1] 87 > > After some more messages there should be also: > > can0 20000200 [8] 00 40 00 00 00 00 5F 00 ERRORFRAME > state-change{back-to-error-active} > error-counter-tx-rx{{95}{0}} > > For each message sent, the error counter decreases by 8. > > >> >> root@imx6qrom5420b1:~# ip -s -d link show can0 >> 4: can0: mtu 16 qdisc pfifo_fast state UNKNOWN >> mode DEFAULT group default qlen 10 >> link/can promiscuity 0 >> can state ERROR-ACTIVE (berr-counter tx 117 rx 0) restart-ms 0 >> bitrate 1000000 sample-point 0.750 >> tq 62 prop-seg 5 phase-seg1 6 phase-seg2 4 sjw 1 >> hi3110: tseg1 2..16 tseg2 2..8 sjw 1..4 brp 1..64 brp-inc 1 >> clock 16000000 >> re-started bus-errors arbit-lost error-warn error-pass bus-off >> 0 1 0 0 0 0 > > Strange, some counters got lost. > >> RX: bytes packets errors dropped overrun mcast >> 0 0 1 0 0 0 >> TX: bytes packets errors dropped carrier collsns >> 120 20 0 0 0 0 >> >> >>> Also, any error message should show the bus error counts in data[7,8]: >>> >>> http://lxr.free-electrons.com/source/drivers/net/can/sja1000/sja1000.c#L408 >>> >>> >> >> I can add this in v4 version of the patch (Above log has this patch >> applied). > > Looks good. > >>> And please check bus-off as well (short-circuiting CAN low and high). >>> >> >> I have not been able to check the bus-off condition by (short-circuiting >> CAN low and high). The tec error count remains at 128 when I short the >> CAN low and high pins and the status never goes BUSOFF. > > You also need to send a message and the short-circuit should be at the > connector of the sending host. What tranceiver is used? Do you know? You could try to set a different bit-rate on the other CAN controller. Then try to send or receive messages. Wolfgang.