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Mon, 02 Nov 2020 08:33:50 -0800 (PST) Received: from alrua-x1.borgediget.toke.dk ([45.145.92.2]) by smtp.gmail.com with ESMTPSA id q20sm4314780qtn.80.2020.11.02.08.33.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Nov 2020 08:33:50 -0800 (PST) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 7E8E6181CED; Mon, 2 Nov 2020 17:33:47 +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: <74a188ac-969e-d28e-005e-e921fc4a1990@gmail.com> References: <2fb69e2a-4423-2b04-cd0f-ca819092bc5f@gmail.com> <20201028231626.GA344207@bjorn-Precision-5520> <20201030112331.meqg6lvultyn6v54@pali> <87k0v7n9y9.fsf@toke.dk> <20201030142337.yushrdcuecycfhcu@pali> <87zh42lfv6.fsf@toke.dk> <20201102152403.4jlmcaqkqeivuypm@pali> <877dr3lpok.fsf@toke.dk> <74a188ac-969e-d28e-005e-e921fc4a1990@gmail.com> X-Clacks-Overhead: GNU Terry Pratchett Date: Mon, 02 Nov 2020 17:33:47 +0100 Message-ID: <87v9enk9as.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 02/11/2020 16:54, Toke H=C3=B8iland-J=C3=B8rgensen wrote: >> Pali Roh=C3=A1r writes: >> >>> On Saturday 31 October 2020 13:49:49 Toke H=C3=B8iland-J=C3=B8rgensen w= rote: >>>> "=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 = wrote: >>>>>>> Pali Roh=C3=A1r writes: >>>>>>>> My experience with that WLE900VX card, aardvark driver and aspm co= de: >>>>>>>> >>>>>>>> Link training in GEN2 mode for this card succeed only once after r= eset. >>>>>>>> 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 Reg= ister" >>>>>>>> (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 t= hat >>>>>>>> card is stable and all future retraining (e.g. from aspm.c) also p= asses. >>>>>>>> >>>>>>>> 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 se= cond >>>>>>>> link retraining at GEN2. And if it fails then below patch issue th= ird >>>>>>>> link retraining at GEN1. If A38x/pci-mvebu has same problem as aar= dvark >>>>>>>> then second link retraining must be at GEN1 (not GEN2) to workarou= nd >>>>>>>> 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 be= ing 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 in= fo >>>>>> 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_= state *link) >>>>>> unsigned long end_jiffies; >>>>>> u16 reg16; >>>>>>=20=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 = lnkctl2 %#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_s= tate *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=20 >>>>> Still exhibiting the BAR update error, run tested with next--20201030 >>>> Yup, same for me :( >>> So then it is different issue and not similar to aardvark one. >>> >>> Anyway, was ASPM working on some previous kernel version? Or was it >>> always broken on Turris Omnia? >> I tried bisecting and couldn't find a commit that worked. And OpenWrt by >> default builds with ASPM off, so my best guess is that it was always >> broken. >> >> However, the two other PCI slots *do* work with ASPM on, as long as >> they're both occupied when booting. If I only have one card installed >> apart from the dodge WLE900, both of them fail... > > Just to be sure it is not a (particular) mPCIe slot issue on the TO -=20 > did you change the device order in the mPCIe slots? No, I didn't. > On my node: > > - right slot (next to the CPU) hosts a SSD > - centre slot hosts WLE900VX > - left slot (over the SIM card slot) hosts the WLE200N2 That's the same order as the PCI subsystem enumerates the slots (on my machine at least). I have WLE200/WLE900/MT76 in those three slots, which makes slot 1 and 3 work, while slot 2 craps out. If I remove the MT76 card (as it was originally), neither of slots 1 and 2 work... -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, DKIM_SIGNED,DKIM_VALID,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 92031C00A89 for ; Mon, 2 Nov 2020 16:35:19 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1FB3722245 for ; Mon, 2 Nov 2020 16:35:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass 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q20sm4314780qtn.80.2020.11.02.08.33.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Nov 2020 08:33:50 -0800 (PST) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 7E8E6181CED; Mon, 2 Nov 2020 17:33:47 +0100 (CET) From: Toke =?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: <74a188ac-969e-d28e-005e-e921fc4a1990@gmail.com> References: <2fb69e2a-4423-2b04-cd0f-ca819092bc5f@gmail.com> <20201028231626.GA344207@bjorn-Precision-5520> <20201030112331.meqg6lvultyn6v54@pali> <87k0v7n9y9.fsf@toke.dk> <20201030142337.yushrdcuecycfhcu@pali> <87zh42lfv6.fsf@toke.dk> <20201102152403.4jlmcaqkqeivuypm@pali> <877dr3lpok.fsf@toke.dk> <74a188ac-969e-d28e-005e-e921fc4a1990@gmail.com> X-Clacks-Overhead: GNU Terry Pratchett Date: Mon, 02 Nov 2020 17:33:47 +0100 Message-ID: <87v9enk9as.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-20201102_113353_912094_34BDF114 X-CRM114-Status: GOOD ( 21.41 ) 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 PiBPbiAwMi8xMS8yMDIwIDE2OjU0LCBUb2tlIEjDuGlsYW5kLUrDuHJnZW5zZW4gd3JvdGU6Cj4+ 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