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Thu, 29 Oct 2020 03:41:22 -0700 (PDT) Received: from alrua-x1.borgediget.toke.dk ([2a0c:4d80:42:443::2]) by smtp.gmail.com with ESMTPSA id e1sm931151qkm.35.2020.10.29.03.41.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2020 03:41:21 -0700 (PDT) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 11A2A181CED; Thu, 29 Oct 2020 11:41:19 +0100 (CET) From: Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= To: Bjorn Helgaas , vtolkm@gmail.com Cc: linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Rob Herring , Ilias Apalodimas , Pali =?utf-8?Q?Roh=C3=A1r?= , Marek =?utf-8?Q?Beh=C3=BAn?= , Thomas Petazzoni , Jason Cooper Subject: Re: PCI trouble on mvebu (Turris Omnia) In-Reply-To: <20201028231626.GA344207@bjorn-Precision-5520> References: <20201028231626.GA344207@bjorn-Precision-5520> X-Clacks-Overhead: GNU Terry Pratchett Date: Thu, 29 Oct 2020 11:41:19 +0100 Message-ID: <877dr9mi0g.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 Bjorn Helgaas writes: > [+cc Pali, Marek, Thomas, Jason] > > On Wed, Oct 28, 2020 at 04:40:00PM +0000, =E2=84=A2=D6=9F=E2=98=BB=D2=87= =CC=AD =D1=BC =D2=89 =C2=AE wrote: >> On 28/10/2020 16:08, Toke H=C3=B8iland-J=C3=B8rgensen wrote: >> > Bjorn Helgaas writes: >> > > On Wed, Oct 28, 2020 at 02:36:13PM +0100, Toke H=C3=B8iland-J=C3=B8r= gensen wrote: >> > > > Toke H=C3=B8iland-J=C3=B8rgensen writes: >> > > > > Bjorn Helgaas writes: >> > > > >=20 >> > > > > > [+cc vtolkm] >> > > > > >=20 >> > > > > > On Tue, Oct 27, 2020 at 04:43:20PM +0100, Toke H=C3=B8iland-J= =C3=B8rgensen wrote: >> > > > > > > Hi everyone >> > > > > > >=20 >> > > > > > > I'm trying to get a mainline kernel to run on my Turris Omni= a, and am >> > > > > > > having some trouble getting the PCI bus to work correctly. S= pecifically, >> > > > > > > I'm running a 5.10-rc1 kernel (torvalds/master as of this mo= ment), with >> > > > > > > the resource request fix[0] applied on top. >> > > > > > >=20 >> > > > > > > The kernel boots fine, and the patch in [0] makes the PCI de= vices show >> > > > > > > up. But I'm still getting initialisation errors like these: >> > > > > > >=20 >> > > > > > > [ 1.632709] pci 0000:01:00.0: BAR 0: error updating (0xe0= 000004 !=3D 0xffffffff) >> > > > > > > [ 1.632714] pci 0000:01:00.0: BAR 0: error updating (high= 0x000000 !=3D 0xffffffff) >> > > > > > > [ 1.632745] pci 0000:02:00.0: BAR 0: error updating (0xe0= 200004 !=3D 0xffffffff) >> > > > > > > [ 1.632750] pci 0000:02:00.0: BAR 0: error updating (high= 0x000000 !=3D 0xffffffff) >> > > > > > >=20 >> > > > > > > and the WiFi drivers fail to initialise with what appears to= me to be >> > > > > > > errors related to the bus rather than to the drivers themsel= ves: >> > > > > > >=20 >> > > > > > > [ 3.509878] ath: phy0: Mac Chip Rev 0xfffc0.f is not supp= orted by this driver >> > > > > > > [ 3.517049] ath: phy0: Unable to initialize hardware; ini= tialization status: -95 >> > > > > > > [ 3.524473] ath9k 0000:01:00.0: Failed to initialize devi= ce >> > > > > > > [ 3.530081] ath9k: probe of 0000:01:00.0 failed with erro= r -95 >> > > > > > > [ 3.536012] ath10k_pci 0000:02:00.0: of_irq_parse_pci: fa= iled with rc=3D134 >> > > > > > > [ 3.543049] pci 0000:00:02.0: enabling device (0140 -> 01= 42) >> > > > > > > [ 3.548735] ath10k_pci 0000:02:00.0: can't change power s= tate from D3hot to D0 (config space inaccessible) >> > > > > > > [ 3.588592] ath10k_pci 0000:02:00.0: failed to wake up de= vice : -110 >> > > > > > > [ 3.595098] ath10k_pci: probe of 0000:02:00.0 failed with= error -110 >> > > > > > >=20 >> > > > > > > lspci looks OK, though: >> > > > > > >=20 >> > > > > > > # lspci >> > > > > > > 00:01.0 PCI bridge: Marvell Technology Group Ltd. Device 682= 0 (rev 04) >> > > > > > > 00:02.0 PCI bridge: Marvell Technology Group Ltd. Device 682= 0 (rev 04) >> > > > > > > 00:03.0 PCI bridge: Marvell Technology Group Ltd. Device 682= 0 (rev 04) >> > > > > > > 01:00.0 Network controller: Qualcomm Atheros AR9287 Wireless= Network Adapter (PCI-Express) (rev 01) >> > > > > > > 02:00.0 Network controller: Qualcomm Atheros QCA986x/988x 80= 2.11ac Wireless Network Adapter (rev ff) >> > > > > > >=20 >> > > > > > > Does anyone have any clue what could be going on here? Is th= is a bug, or >> > > > > > > did I miss something in my config or other initialisation? I= 've tried >> > > > > > > with both the stock u-boot distributed with the board, and w= ith an >> > > > > > > upstream u-boot from latest master; doesn't seem to make any= different. >> > > > > > Can you try turning off CONFIG_PCIEASPM? We had a similar rec= ent >> > > > > > report at https://bugzilla.kernel.org/show_bug.cgi?id=3D209833= but I >> > > > > > don't think we have a fix yet. >> > > > > Yes! Turning that off does indeed help! Thanks a bunch :) >> > > > >=20 >> > > > > You mention that bisecting this would be helpful - I can try that >> > > > > tomorrow; any idea when this was last working? >> > > > OK, so I tried to bisect this, but, erm, I couldn't find a working >> > > > revision to start from? I went all the way back to 4.10 (which is = the >> > > > first version to include the device tree file for the Omnia), and = even >> > > > on that, the wireless cards were failing to initialise with ASPM >> > > > enabled... >> > > I have no personal experience with this device; all I know is that t= he >> > > bugzilla suggests that it worked in v5.4, which isn't much help. >> > >=20 >> > > Possibly the apparent regression was really a .config change, i.e., >> > > CONFIG_PCIEASPM was disabled in the v5.4 kernel vtolkm@ tested and it >> > > "worked" but got enabled later and it started failing? >> > Yeah, I suspect so. The OpenWrt config disables CONFIG_PCIEASPM by >> > default and only turns it on for specific targets. So I guess that it's >> > most likely that this has never worked... >> >=20 >> > > Maybe the debug patch below would be worth trying to see if it makes >> > > any difference? If it *does* help, try omitting the first hunk to s= ee >> > > if we just need to apply the quirk_enable_clear_retrain_link() quirk. >> > Tried, doesn't help... >> >=20 >> > -Toke >>=20 >> Found this patch >>=20 >> https://github.com/openwrt/openwrt/blob/7c0496f29bed87326f1bf591ca25ace8= 2373cfc7/target/linux/mvebu/patches-5.4/405-PCI-aardvark-Improve-link-train= ing.patch >>=20 >> that mentions the Compex WLE900VX card, which reading the lspci verbose >> output from the bugtracker seems to the device being troubled. > > Interesting. Indeed, the Compex WLE900VX card seems to have the > Qualcomm Atheros QCA9880 on it, and it looks like Toke's system has > the same device in it. > > The patch you mention (https://git.kernel.org/linus/43fc679ced18) is > for aardvark, so of course doesn't help mvebu. > > PCIe hardware is supposed to automatically negotiate the highest link > speed supported by both ends. But software *is* allowed to set an > upper limit (the Target Link Speed in Link Control 2). If we initiate > a retrain and the link doesn't come back up, I wonder if we should try > to help the hardware out by using Target Link Speed to limit to a > lower speed and attempting another retrain, something like this hacky > patch: (please collect the dmesg log if you try this) Well, I tried it, but don't see any of the 'lnkcap2' output from that new function: [ 1.545853] mvebu-pcie soc:pcie: host bridge /soc/pcie ranges: [ 1.545878] mvebu-pcie soc:pcie: MEM 0x00f1080000..0x00f1081fff -> = 0x0000080000 [ 1.545894] mvebu-pcie soc:pcie: MEM 0x00f1040000..0x00f1041fff -> = 0x0000040000 [ 1.545907] mvebu-pcie soc:pcie: MEM 0x00f1044000..0x00f1045fff -> = 0x0000044000 [ 1.545920] mvebu-pcie soc:pcie: MEM 0x00f1048000..0x00f1049fff -> = 0x0000048000 [ 1.545933] mvebu-pcie soc:pcie: MEM 0xffffffffffffffff..0x00ffffff= fe -> 0x0100000000 [ 1.545945] mvebu-pcie soc:pcie: IO 0xffffffffffffffff..0x00ffffff= fe -> 0x0100000000 [ 1.545958] mvebu-pcie soc:pcie: MEM 0xffffffffffffffff..0x00ffffff= fe -> 0x0200000000 [ 1.545970] mvebu-pcie soc:pcie: IO 0xffffffffffffffff..0x00ffffff= fe -> 0x0200000000 [ 1.545982] mvebu-pcie soc:pcie: MEM 0xffffffffffffffff..0x00ffffff= fe -> 0x0300000000 [ 1.545994] mvebu-pcie soc:pcie: IO 0xffffffffffffffff..0x00ffffff= fe -> 0x0300000000 [ 1.546006] mvebu-pcie soc:pcie: MEM 0xffffffffffffffff..0x00ffffff= fe -> 0x0400000000 [ 1.546014] mvebu-pcie soc:pcie: IO 0xffffffffffffffff..0x00ffffff= fe -> 0x0400000000 [ 1.546181] mvebu-pcie soc:pcie: PCI host bridge to bus 0000:00 [ 1.546190] pci_bus 0000:00: root bus resource [bus 00-ff] [ 1.546197] pci_bus 0000:00: root bus resource [mem 0xf1080000-0xf1081ff= f] (bus address [0x00080000-0x00081fff]) [ 1.546204] pci_bus 0000:00: root bus resource [mem 0xf1040000-0xf1041ff= f] (bus address [0x00040000-0x00041fff]) [ 1.546210] pci_bus 0000:00: root bus resource [mem 0xf1044000-0xf1045ff= f] (bus address [0x00044000-0x00045fff]) [ 1.546216] pci_bus 0000:00: root bus resource [mem 0xf1048000-0xf1049ff= f] (bus address [0x00048000-0x00049fff]) [ 1.546220] pci_bus 0000:00: root bus resource [mem 0xe0000000-0xe7fffff= f] [ 1.546225] pci_bus 0000:00: root bus resource [io 0x1000-0xeffff] [ 1.546294] pci 0000:00:01.0: [11ab:6820] type 01 class 0x060400 [ 1.546308] pci 0000:00:01.0: reg 0x38: [mem 0x00000000-0x000007ff pref] [ 1.546482] pci 0000:00:02.0: [11ab:6820] type 01 class 0x060400 [ 1.546495] pci 0000:00:02.0: reg 0x38: [mem 0x00000000-0x000007ff pref] [ 1.546643] pci 0000:00:03.0: [11ab:6820] type 01 class 0x060400 [ 1.546656] pci 0000:00:03.0: reg 0x38: [mem 0x00000000-0x000007ff pref] [ 1.547379] PCI: bus0: Fast back to back transfers disabled [ 1.547387] pci 0000:00:01.0: bridge configuration invalid ([bus 00-00])= , reconfiguring [ 1.547394] pci 0000:00:02.0: bridge configuration invalid ([bus 00-00])= , reconfiguring [ 1.547402] pci 0000:00:03.0: bridge configuration invalid ([bus 00-00])= , reconfiguring [ 1.547484] pci 0000:01:00.0: [168c:002e] type 00 class 0x028000 [ 1.547507] pci 0000:01:00.0: reg 0x10: [mem 0xe8000000-0xe800ffff 64bit] [ 1.547615] pci 0000:01:00.0: supports D1 [ 1.547620] pci 0000:01:00.0: PME# supported from D0 D1 D3hot [ 1.547730] pci 0000:00:01.0: ASPM: current common clock configuration i= s inconsistent, reconfiguring [ 1.631937] PCI: bus2: Fast back to back transfers enabled [ 1.631945] pci_bus 0000:02: busn_res: [bus 02-ff] end is updated to 02 [ 1.632655] PCI: bus3: Fast back to back transfers enabled [ 1.632662] pci_bus 0000:03: busn_res: [bus 03-ff] end is updated to 03 [ 1.632694] pci 0000:00:01.0: BAR 8: assigned [mem 0xe0000000-0xe00fffff] [ 1.632702] pci 0000:00:02.0: BAR 8: assigned [mem 0xe0200000-0xe04fffff] [ 1.632710] pci 0000:00:01.0: BAR 6: assigned [mem 0xe0100000-0xe01007ff= pref] [ 1.632718] pci 0000:00:02.0: BAR 6: assigned [mem 0xe0500000-0xe05007ff= pref] [ 1.632726] pci 0000:00:03.0: BAR 6: assigned [mem 0xe0600000-0xe06007ff= pref] [ 1.632734] pci 0000:01:00.0: BAR 0: assigned [mem 0xe0000000-0xe000ffff= 64bit] [ 1.632741] pci 0000:01:00.0: BAR 0: error updating (0xe0000004 !=3D 0xf= fffffff) [ 1.632746] pci 0000:01:00.0: BAR 0: error updating (high 0x000000 !=3D = 0xffffffff) [ 1.632752] pci 0000:00:01.0: PCI bridge to [bus 01] [ 1.632760] pci 0000:00:01.0: bridge window [mem 0xe0000000-0xe00fffff] [ 1.632769] pci 0000:02:00.0: BAR 0: assigned [mem 0xe0200000-0xe03fffff= 64bit] [ 1.632776] pci 0000:02:00.0: BAR 0: error updating (0xe0200004 !=3D 0xf= fffffff) [ 1.632782] pci 0000:02:00.0: BAR 0: error updating (high 0x000000 !=3D = 0xffffffff) [ 1.632788] pci 0000:02:00.0: BAR 6: assigned [mem 0xe0400000-0xe040ffff= pref] [ 1.632793] pci 0000:00:02.0: PCI bridge to [bus 02] [ 1.632800] pci 0000:00:02.0: bridge window [mem 0xe0200000-0xe04fffff] [ 1.632807] pci 0000:00:03.0: PCI bridge to [bus 03] (and then later, still): [ 3.476364] pci 0000:00:01.0: enabling device (0140 -> 0142) [ 3.477542] ata1: SATA link down (SStatus 0 SControl 300) [ 3.482126] ath9k 0000:01:00.0: enabling device (0000 -> 0002) [ 3.487487] ata2: SATA link down (SStatus 0 SControl 300) [ 3.493379] ath: phy0: Mac Chip Rev 0xfffc0.f is not supported by this d= river [ 3.505891] ath: phy0: Unable to initialize hardware; initialization sta= tus: -95 [ 3.513325] ath9k 0000:01:00.0: Failed to initialize device [ 3.518933] ath9k: probe of 0000:01:00.0 failed with error -95 [ 3.524862] ath10k_pci 0000:02:00.0: of_irq_parse_pci: failed with rc=3D= 134 [ 3.531904] pci 0000:00:02.0: enabling device (0140 -> 0142) [ 3.537590] ath10k_pci 0000:02:00.0: can't change power state from D3hot= to D0 (config space inaccessible) [ 3.577436] ath10k_pci 0000:02:00.0: failed to wake up device : -110 [ 3.583948] ath10k_pci: probe of 0000:02:00.0 failed with error -110 -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=-8.8 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