From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A7AC9C433E7 for ; Wed, 22 Jul 2020 13:42:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7A10D20717 for ; Wed, 22 Jul 2020 13:42:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="r1zGw3up" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732484AbgGVNm0 (ORCPT ); Wed, 22 Jul 2020 09:42:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44230 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732476AbgGVNmZ (ORCPT ); Wed, 22 Jul 2020 09:42:25 -0400 Received: from mail-ej1-x642.google.com (mail-ej1-x642.google.com [IPv6:2a00:1450:4864:20::642]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59176C0619DC for ; Wed, 22 Jul 2020 06:42:25 -0700 (PDT) Received: by mail-ej1-x642.google.com with SMTP id y10so2271362eje.1 for ; Wed, 22 Jul 2020 06:42:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=jXgAXCEDsC829k4D1lyuLHiL7I7MYIotT8rbhGrW/y8=; b=r1zGw3up7cFv29+4fN6pS4b5pju96gwkBmEBnNQoS7mTYtdRJzgh9015DDakLR+yCi Tuf6u61Vaedrqed/JPLJWrUD8kJvAFqlTmHqEQEPQr5Z1Ub/dDSGQhxLckydrYEkCrC9 bn4TeSTarNDpK8bS259UXPXXbNsdEeL9fckDcsUDFwCaK4zoA3P7XV/tYFYW7IcRzYfE rFAfddhdHMFDt7tAXM6pXANjlgI82AcWrWbwKYcX1og3gfJmSTllRTgzvdWgvQevZ+IM LZZE0K8TuwMN4dr5QcTp2KG+kKTsyQ5766mO3Wjrvg7A9gsRTZzRq6nmj0Oe3QzXIlvM 5EMg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=jXgAXCEDsC829k4D1lyuLHiL7I7MYIotT8rbhGrW/y8=; b=UA7jr/6mXcIyZlgdtaFQpE23+qPVL2ZN08r1INpEs3CWa6BN8sP89gnbiKoe2iy8bi wC35o2Hvj9xvQdxgXe9ursVUJJTC/2q3JCVDJVhy2TLfMEgk/5x1uS528lMGTWIO6HQk Pp46+NgRBa3ehg5hRXtCrox9gXztroKnaOMkZptBYO1tccvKBxmRZGLgR2wHd3Szb8bB KNGGqkQ4gzvYs+ZEcEww3zNmVJ9HtQCOWeGPKxBuwpPfzT0r6PMgEWXNdQnSP8jMq/CL x9Vmu+rj+bsQxIqUf0/134/dEVhqR/djCL4NF6NPL3UB6QugGwBpgEGnnR78vunaawEx /e8A== X-Gm-Message-State: AOAM5314pHmiZ99RxGr9C4JSwafq6rEdhj7v6CM6eLiS+OohqoI6+1ez eXaNI7IaRmD617SIchiNeDU= X-Google-Smtp-Source: ABdhPJzJc00TJhf+Asb1Caf8dcf9T4WhzKQofIHB2mYL5MpJXZYScG0lmqNieKTBxbdc8EDtUGS2vw== X-Received: by 2002:a17:906:f2c4:: with SMTP id gz4mr29811947ejb.484.1595425343760; Wed, 22 Jul 2020 06:42:23 -0700 (PDT) Received: from ?IPv6:2003:ea:8f23:5700:ac7e:458:8900:888c? 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[2003:ea:8f23:5700:ac7e:458:8900:888c]) by smtp.googlemail.com with ESMTPSA id w20sm19369334eds.21.2020.07.22.06.42.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 22 Jul 2020 06:42:23 -0700 (PDT) Subject: Re: fec: micrel: Ethernet PHY type ID auto-detection issue To: Bruno Thomsen , Andrew Lunn , Fabio Estevam Cc: netdev , Florian Fainelli , Russell King - ARM Linux , Lars Alex Pedersen , "bruno.thomsen@gmail.com" References: <20200717163441.GA1339445@lunn.ch> From: Heiner Kallweit Message-ID: Date: Wed, 22 Jul 2020 15:42:17 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 22.07.2020 12:59, Bruno Thomsen wrote: > Hi Andrew,  > >>>> I have been having issues with Ethernet PHY type ID >>>> auto-detection when changing from the deprecated fec >>>> phy-reset-{gpios,duration,post-delay} properties to the >>>> modern mdio reset-{assert-us,deassert-us,gpios} >>>> properties in the device tree. >> >>>> Kernel error messages (modem mdio reset): >>>> mdio_bus 30be0000.ethernet-1: MDIO device at address 1 is missing. >>>> fec 30be0000.ethernet eth0: Unable to connect to phy >> >> It sounds like the PHY is not responding during scanning of the bus. > > Yes, that is correct. > >> If the ID is mostly 0xff there is no device there. >> >> So check the initial reset state of the PHY, and when is it taken out >> of reset, and is the delay long enough for it to get itself together >> and start answering requests. > > When capturing traces with a logic analyzer, I do the following: > - break the target in the bootloader > - start trigger on reset or mdio signal (had to use mdio as reset wasn't used) > - boot linux > > I monitor 4 signals: MDIO, MDC, 3V3, reset. > > The new mdio code path does not reset the PHY before reading > of PHY type ID and for some reason this result in no responce, > e.g. high (0xFFFF) and missing MDIO turnaround. > > MDC is 2.5MHz, and I can decode the 2 read requests with a logic > analyzer: > > START C22 > OPCODE [Read] > PHY Address ['1' (0x01)] > Register Address ['2' (0x02)] > !Turnaround > Data ['65535' (0xFFFF)] > > START C22 > OPCODE [Read] > PHY Address ['1' (0x01)] > Register Address ['3' (0x03)] > !Turnaround > Data ['65535' (0xFFFF)] > > When using the deprecated fec phy reset code path, the PHY > chip is reset just before reading of register 0x02 and 0x03. > In this case the PHY respond correct with 0x0022 and 0x1561. > > When looking at the mdio code I don't understand how the > reset code should even work in the first place. > >> static int mdio_probe(struct device *dev) >> { >> struct mdio_device *mdiodev = to_mdio_device(dev); >> struct device_driver *drv = mdiodev->dev.driver; >> struct mdio_driver *mdiodrv = to_mdio_driver(drv); >> int err = 0; >> >> if (mdiodrv->probe) { >> /* Deassert the reset signal */ >> mdio_device_reset(mdiodev, 0); > > This assumes that the reset signal is asserted already. > Not my case and it seems very flaky. > > Deprecated fec code assert reset signal before reset assert delay, > following deassert reset and deassert delay. > https://elixir.bootlin.com/linux/latest/source/drivers/net/ethernet/freescale/fec_main.c#L3373 > >> >> err = mdiodrv->probe(mdiodev); >> if (err) { >> /* Assert the reset signal */ >> mdio_device_reset(mdiodev, 1); > > Reset signal is asserted in error path but there are no > retry on probe. > > >> void mdio_device_reset(struct mdio_device *mdiodev, int value) >> { >> unsigned int d; >> >> ...... >> >> d = value ? mdiodev->reset_assert_delay : mdiodev->reset_deassert_delay; >> if (d) >> usleep_range(d, d + max_t(unsigned int, d / 10, 100)); > > This is not the recommended way of sleeping if d > 20ms. > Meanwhile there's a helper fsleep() that considers the thresholds for calling udelay/usleep_range/msleep. > https://www.kernel.org/doc/Documentation/timers/timers-howto.txt > > The deprecated fec code handles this correctly. > https://elixir.bootlin.com/linux/latest/source/drivers/net/ethernet/freescale/fec_main.c#L3381 > > if (d) > if (d > 20000) > msleep(d / 1000); > else > usleep_range(d, d + max_t(unsigned int, d / 10, 100)); > > > Micrel recommended reset circuit has a deassert tau of 100ms, e.g. 10k * 10uF. > So to be sure the signal is deasserted 5 * tau or more, and this brings the value > up in the 500-1000ms range depending on component tolerances and design > margin. > > See figure 22 in pdf for reset circuit. > http://ww1.microchip.com/downloads/en/devicedoc/ksz8081mnx-rnb.pdf > > So my current conclusion is that using generic mdio phy handling does > not work with Micrel PHYs unless 3 issues has been resolved. > - Reset PHY before auto type detection. > - Add initial assert reset signal + delay when resetting phy. > - Handle >20ms reset delays. > > /Bruno > > ---- > When using the 5.8.0-rc6 kernel (dirty due to device tree changes), > I sometimes hit this kernel issue (never seen it with 5.7.8 or earlier), > but don't think it's related: > > kernel: ============================================================================= > kernel: BUG task_struct(119:NetworkManager-dispatcher.service) (Not tainted): Poison overwritten > kernel: ----------------------------------------------------------------------------- > kernel: Disabling lock debugging due to kernel taint > kernel: INFO: 0xe05e9b3f-0x9b36c418 @offset=30464. First byte 0xff instead of 0x6b > kernel: INFO: Slab 0xaa165da6 objects=18 used=0 fp=0x37e5d9c3 flags=0x10200 > kernel: INFO: Object 0xf19b9dd9 @offset=29440 fp=0x00000000 > kernel: Redzone cb135af3: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................ > kernel: Redzone a0061a8a: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................ > kernel: Redzone f2917653: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................ > kernel: Redzone aeb00bb5: bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ................ > kernel: Object f19b9dd9: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object cadb3eab: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object a51c2cd1: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 6b25d1e5: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 1e35e7e8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 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Object cd12758c: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 212096ca: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 8462745b: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object a430d1b2: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 7a0d1289: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object e05e9b3f: ff 4d ff ff ff ff ff ff 10 e7 c6 77 3e 38 08 00 .M.........w>8.. > kernel: Object 8c5945af: 45 00 00 48 42 05 00 00 80 11 75 5c ac 14 15 1c E..HB.....u\.... > kernel: Object de1b76ee: ac 14 15 ff e1 15 e1 15 00 34 8a 61 53 70 6f 74 .........4.aSpot > kernel: Object a54d91d1: 55 64 70 30 94 e4 06 54 2b ed 49 66 00 01 00 04 Udp0...T+.If.... > kernel: Object 08ebc3be: 48 95 c2 03 94 eb 5d 89 b7 b5 0c 41 d7 12 76 ea H.....]....A..v. > kernel: Object ff29f54f: b1 7e 4d ed bb 74 cc c7 62 3d 2f 10 bb 74 cc c7 .~M..t..b=/..t.. > kernel: Object 9678dfaa: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > kernel: Object 426da6d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > kernel: Object 7fab2713: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 60862a98: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 0810ad40: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 1f0aa745: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 19944bf2: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 4ce341aa: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 9607ec6d: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object a5915de7: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object d686baa6: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 1df19b0d: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 0bbe9a96: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 6f1e7700: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 824ce600: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 790d4580: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object f8a184dd: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object f65d9e18: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object b52e601b: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 82bf9d2e: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object bf8060fe: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object e90100be: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object ea74812b: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object e6403677: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object faf222d4: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object dca677d2: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 1c2391f0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object fb8b9c6d: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object 967ee7ed: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > kernel: Object f597fef4: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkkkkkk. > kernel: Redzone 13b0f2f9: bb bb bb bb .... > kernel: Padding 372127fe: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ > kernel: Padding 6d5fbace: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ > kernel: CPU: 0 PID: 127 Comm: kworker/0:3 Tainted: G B 5.8.0-rc6-00008-g87d248347e60-dirty #1 > kernel: Hardware name: Freescale i.MX7 Dual (Device Tree) > kernel: Workqueue: memcg_kmem_cache kmemcg_workfn > kernel: [<8010ed20>] (unwind_backtrace) from [<8010b734>] (show_stack+0x10/0x14) > kernel: [<8010b734>] (show_stack) from [<8047caf4>] (dump_stack+0x8c/0xa0) > kernel: [<8047caf4>] (dump_stack) from [<8027351c>] (check_bytes_and_report+0xcc/0xe8) > kernel: [<8027351c>] (check_bytes_and_report) from [<80274e0c>] (check_object+0x248/0x2ac) > kernel: [<80274e0c>] (check_object) from [<80274edc>] (__free_slab+0x6c/0x2bc) > kernel: [<80274edc>] (__free_slab) from [<80279a1c>] (__kmem_cache_shrink+0x1f4/0x248) > kernel: [<80279a1c>] (__kmem_cache_shrink) from [<80279a7c>] (__kmemcg_cache_deactivate_after_rcu+0xc/0x4c) > kernel: [<80279a7c>] (__kmemcg_cache_deactivate_after_rcu) from [<80249bb8>] (kmemcg_cache_deactivate_after_rcu+0xc/0x1c) > kernel: [<80249bb8>] (kmemcg_cache_deactivate_after_rcu) from [<80249b98>] (kmemcg_workfn+0x24/0x38) > kernel: [<80249b98>] (kmemcg_workfn) from [<80140000>] (process_one_work+0x19c/0x3e4) > kernel: [<80140000>] (process_one_work) from [<8014028c>] (worker_thread+0x44/0x4dc) > kernel: [<8014028c>] (worker_thread) from [<80146a2c>] (kthread+0x144/0x180) > kernel: [<80146a2c>] (kthread) from [<80100148>] (ret_from_fork+0x14/0x2c) > kernel: Exception stack(0xbb1d5fb0 to 0xbb1d5ff8) > kernel: 5fa0: 00000000 00000000 00000000 00000000 > kernel: 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > kernel: 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 > kernel: FIX task_struct(119:NetworkManager-dispatcher.service): Restoring 0xe05e9b3f-0x9b36c418=0x6b >