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=-6.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 53FEFC388F7 for ; Sat, 31 Oct 2020 12:49:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 12B27206E3 for ; Sat, 31 Oct 2020 12:49:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="BX9QRJ1X" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727041AbgJaMt5 (ORCPT ); Sat, 31 Oct 2020 08:49:57 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:45590 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726738AbgJaMt5 (ORCPT ); Sat, 31 Oct 2020 08:49:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1604148595; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GHqG6s2lT3VDoj/QAMTo8QRxHVGhqbEvNUDz3n60Bsk=; b=BX9QRJ1XSFRQ+wh1TwCaV1ZbejpU7f1EakSgGMBlOq93iwgPcqjr3mQrCpRDPkR+IdCv97 c0zPY92bpW5w+HmqIFD93pOdVrcP9Z3ScP30GOFAeyHOWcDY8Jpu1RomI9J1TLpFBtJbRx 2+hFqkLi8Au4iQXc4ghdztWK5fT6bKQ= Received: from mail-il1-f197.google.com (mail-il1-f197.google.com [209.85.166.197]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-217-QaAW6Ac-N8mVNCC7t-lOSQ-1; Sat, 31 Oct 2020 08:49:53 -0400 X-MC-Unique: QaAW6Ac-N8mVNCC7t-lOSQ-1 Received: by mail-il1-f197.google.com with SMTP id t6so6667762ilj.10 for ; Sat, 31 Oct 2020 05:49:53 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:in-reply-to:references:date :message-id:mime-version:content-transfer-encoding; bh=GHqG6s2lT3VDoj/QAMTo8QRxHVGhqbEvNUDz3n60Bsk=; b=LOQZUjoJ/MV/9XLukHsANkqBG0G9URXraMoubGzLrl//D9L4YZWfsPBhApGn+/6twP PPdk2ZhzHRtdv+BGyHjbFT07llgixapa+Q72IQfdpRuGtgDs4la+LP2AiiXExniGGdPb ju9O4Mg86XMQUFyI+5ZRsPAp4V8zMooWSCV829WsRSQEmmpu3Hn3SAgD3C7gqRGnH36M tVVv1htEIKxN3m46ZIp04Rf8yD3mBSLzi4471GZtkYIR0ChRweEbCSdx2Re3xCi2K7QE 1yVOdQyTUNsqF7rw005bJP7+bCRBzWCnQxgm5mP1OmPbYdFIbVRBJFxlcQr1vgckBh0j 9qbQ== X-Gm-Message-State: AOAM532NVaFxNJFKHnzpg9f/IWCrivcw2HO3RP3dHjQrEVMJdURmv5FG 13eeT3vG+b67I9/IsSvQ80wX4JEvl4xRQ206UBRGOk/Gj5cVyFs5sPm6fyS+4N2cgy6xitypIn2 A9XP0mfR6anmBqkvDUI2s X-Received: by 2002:a92:9f0c:: with SMTP id u12mr5281344ili.113.1604148592549; Sat, 31 Oct 2020 05:49:52 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwgUjuecdKZIBdMAl5N6k3YLEsb/g4tH353sQ6qnIBRy3b4xsC11uKWq3BLHCBrr3uLq/ZPxg== X-Received: by 2002:a92:9f0c:: with SMTP id u12mr5281329ili.113.1604148592167; Sat, 31 Oct 2020 05:49:52 -0700 (PDT) Received: from alrua-x1.borgediget.toke.dk ([2a0c:4d80:42:443::2]) by smtp.gmail.com with ESMTPSA id r4sm6917700ilj.43.2020.10.31.05.49.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 31 Oct 2020 05:49:51 -0700 (PDT) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 96071181AD1; Sat, 31 Oct 2020 13:49:49 +0100 (CET) From: Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= To: vtolkm@gmail.com, Pali =?utf-8?Q?Roh=C3=A1r?= Cc: Bjorn Helgaas , linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Rob Herring , Ilias Apalodimas , Marek =?utf-8?Q?Beh=C3=BAn?= , Thomas Petazzoni , Jason Cooper Subject: Re: PCI trouble on mvebu (Turris Omnia) In-Reply-To: References: <2fb69e2a-4423-2b04-cd0f-ca819092bc5f@gmail.com> <20201028231626.GA344207@bjorn-Precision-5520> <20201030112331.meqg6lvultyn6v54@pali> <87k0v7n9y9.fsf@toke.dk> <20201030142337.yushrdcuecycfhcu@pali> X-Clacks-Overhead: GNU Terry Pratchett Date: Sat, 31 Oct 2020 13:49:49 +0100 Message-ID: <87zh42lfv6.fsf@toke.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org "=E2=84=A2=D6=9F=E2=98=BB=D2=87=CC=AD =D1=BC =D2=89 =C2=AE" writes: > On 30/10/2020 15:23, Pali Roh=C3=A1r wrote: >> On Friday 30 October 2020 14:02:22 Toke H=C3=B8iland-J=C3=B8rgensen wrot= e: >>> Pali Roh=C3=A1r writes: >>>> My experience with that WLE900VX card, aardvark driver and aspm code: >>>> >>>> Link training in GEN2 mode for this card succeed only once after reset. >>>> Repeated link retraining fails and it fails even when aardvark is >>>> reconfigured to GEN1 mode. Reset via PERST# signal is required to have >>>> working link training. >>>> >>>> What I did in aardvark driver: Set mode to GEN2, do link training. If >>>> success read "negotiated link speed" from "Link Control Status Registe= r" >>>> (for WLE900VX it is 0x1 - GEN1) and set it into aardvark. And then >>>> retrain link again (for WLE900VX now it would be at GEN1). After that >>>> card is stable and all future retraining (e.g. from aspm.c) also passe= s. >>>> >>>> If I do not change aardvark mode from GEN2 to GEN1 the second link >>>> training fails. And if I change mode to GEN1 after this failed link >>>> training then nothing happen, link training do not success. >>>> >>>> So just speculation now... In current setup initialization of card does >>>> one link training at GEN2. Then aspm.c is called which is doing second >>>> link retraining at GEN2. And if it fails then below patch issue third >>>> link retraining at GEN1. If A38x/pci-mvebu has same problem as aardvark >>>> then second link retraining must be at GEN1 (not GEN2) to workaround >>>> this issue. >>>> >>>> Bjorn, Toke: what about trying to hack aspm.c code to never do link >>>> retraining at GEN2 speed? And always force GEN1 speed prior link >>>> training? >>> Sounds like a plan. I poked around in aspm.c and must confess to being a >>> bit lost in the soup of registers ;) >>> >>> So if one of you can cook up a patch, that would be most helpful! >> I modified Bjorn's patch, explicitly set tls to 1 and added debug info >> about cls (current link speed, that what is used by aardvark). It is >> untested, I just tried to compile it. >> >> Can try it? >> >> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c >> index 253c30cc1967..f934c0b52f41 100644 >> --- a/drivers/pci/pcie/aspm.c >> +++ b/drivers/pci/pcie/aspm.c >> @@ -206,6 +206,27 @@ static bool pcie_retrain_link(struct pcie_link_stat= e *link) >> unsigned long end_jiffies; >> u16 reg16; >>=20=20=20 >> + u32 lnkcap2; >> + u16 lnksta, lnkctl2, cls, tls; >> + >> + pcie_capability_read_dword(parent, PCI_EXP_LNKCAP2, &lnkcap2); >> + pcie_capability_read_word(parent, PCI_EXP_LNKSTA, &lnksta); >> + pcie_capability_read_word(parent, PCI_EXP_LNKCTL2, &lnkctl2); >> + cls =3D lnksta & PCI_EXP_LNKSTA_CLS; >> + tls =3D lnkctl2 & PCI_EXP_LNKCTL2_TLS; >> + >> + pci_info(parent, "lnkcap2 %#010x sls %#04x lnksta %#06x cls %#03x lnkc= tl2 %#06x tls %#03x\n", >> + lnkcap2, (lnkcap2 & 0x3F) >> 1, >> + lnksta, cls, >> + lnkctl2, tls); >> + >> + tls =3D 1; >> + pcie_capability_clear_and_set_word(parent, PCI_EXP_LNKCTL2, >> + PCI_EXP_LNKCTL2_TLS, tls); >> + pcie_capability_read_word(parent, PCI_EXP_LNKCTL2, &lnkctl2); >> + pci_info(parent, "lnkctl2 %#010x new tls %#03x\n", >> + lnkctl2, tls); >> + >> pcie_capability_read_word(parent, PCI_EXP_LNKCTL, ®16); >> reg16 |=3D PCI_EXP_LNKCTL_RL; >> pcie_capability_write_word(parent, PCI_EXP_LNKCTL, reg16); >> @@ -227,6 +248,8 @@ static bool pcie_retrain_link(struct pcie_link_state= *link) >> break; >> msleep(1); >> } while (time_before(jiffies, end_jiffies)); >> + pci_info(parent, "lnksta %#06x new cls %#03x\n", >> + lnksta, (cls & PCI_EXP_LNKSTA_CLS)); >> return !(reg16 & PCI_EXP_LNKSTA_LT); >> } >>=20=20=20 > > Still exhibiting the BAR update error, run tested with next--20201030 Yup, same for me :( -Toke 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=-6.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, 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=?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= To: vtolkm@gmail.com, Pali =?utf-8?Q?Roh=C3=A1r?= Subject: Re: PCI trouble on mvebu (Turris Omnia) In-Reply-To: References: <2fb69e2a-4423-2b04-cd0f-ca819092bc5f@gmail.com> <20201028231626.GA344207@bjorn-Precision-5520> <20201030112331.meqg6lvultyn6v54@pali> <87k0v7n9y9.fsf@toke.dk> <20201030142337.yushrdcuecycfhcu@pali> X-Clacks-Overhead: GNU Terry Pratchett Date: Sat, 31 Oct 2020 13:49:49 +0100 Message-ID: <87zh42lfv6.fsf@toke.dk> MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=toke@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201031_084956_876529_78841BF2 X-CRM114-Status: GOOD ( 14.90 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rob Herring , Jason Cooper , linux-pci@vger.kernel.org, Ilias Apalodimas , Marek =?utf-8?Q?Beh=C3=BAn?= , Bjorn Helgaas , Thomas Petazzoni , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org IuKEotaf4pi70ofMrSDRvCDSiSDCriIgPHZ0b2xrbUBnb29nbGVtYWlsLmNvbT4gd3JpdGVzOgoK PiBPbiAzMC8xMC8yMDIwIDE1OjIzLCBQYWxpIFJvaMOhciB3cm90ZToKPj4gT24gRnJpZGF5IDMw IE9jdG9iZXIgMjAyMCAxNDowMjoyMiBUb2tlIEjDuGlsYW5kLUrDuHJnZW5zZW4gd3JvdGU6Cj4+ PiBQYWxpIFJvaMOhciA8cGFsaUBrZXJuZWwub3JnPiB3cml0ZXM6Cj4+Pj4gTXkgZXhwZXJpZW5j ZSB3aXRoIHRoYXQgV0xFOTAwVlggY2FyZCwgYWFyZHZhcmsgZHJpdmVyIGFuZCBhc3BtIGNvZGU6 Cj4+Pj4KPj4+PiBMaW5rIHRyYWluaW5nIGluIEdFTjIgbW9kZSBmb3IgdGhpcyBjYXJkIHN1Y2Nl ZWQgb25seSBvbmNlIGFmdGVyIHJlc2V0Lgo+Pj4+IFJlcGVhdGVkIGxpbmsgcmV0cmFpbmluZyBm YWlscyBhbmQgaXQgZmFpbHMgZXZlbiB3aGVuIGFhcmR2YXJrIGlzCj4+Pj4gcmVjb25maWd1cmVk 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