From: Bjorn Helgaas <helgaas@kernel.org>
To: "Toke Høiland-Jørgensen" <toke@redhat.com>
Cc: linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
Rob Herring <robh@kernel.org>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
vtolkm@googlemail.com
Subject: Re: PCI trouble on mvebu (Turris Omnia)
Date: Wed, 28 Oct 2020 09:42:09 -0500 [thread overview]
Message-ID: <20201028144209.GA315566@bjorn-Precision-5520> (raw)
In-Reply-To: <87y2jqmq0i.fsf@toke.dk>
On Wed, Oct 28, 2020 at 02:36:13PM +0100, Toke Høiland-Jørgensen wrote:
> Toke Høiland-Jørgensen <toke@redhat.com> writes:
>
> > Bjorn Helgaas <helgaas@kernel.org> writes:
> >
> >> [+cc vtolkm]
> >>
> >> On Tue, Oct 27, 2020 at 04:43:20PM +0100, Toke Høiland-Jørgensen wrote:
> >>> Hi everyone
> >>>
> >>> I'm trying to get a mainline kernel to run on my Turris Omnia, and am
> >>> having some trouble getting the PCI bus to work correctly. Specifically,
> >>> I'm running a 5.10-rc1 kernel (torvalds/master as of this moment), with
> >>> the resource request fix[0] applied on top.
> >>>
> >>> The kernel boots fine, and the patch in [0] makes the PCI devices show
> >>> up. But I'm still getting initialisation errors like these:
> >>>
> >>> [ 1.632709] pci 0000:01:00.0: BAR 0: error updating (0xe0000004 != 0xffffffff)
> >>> [ 1.632714] pci 0000:01:00.0: BAR 0: error updating (high 0x000000 != 0xffffffff)
> >>> [ 1.632745] pci 0000:02:00.0: BAR 0: error updating (0xe0200004 != 0xffffffff)
> >>> [ 1.632750] pci 0000:02:00.0: BAR 0: error updating (high 0x000000 != 0xffffffff)
> >>>
> >>> and the WiFi drivers fail to initialise with what appears to me to be
> >>> errors related to the bus rather than to the drivers themselves:
> >>>
> >>> [ 3.509878] ath: phy0: Mac Chip Rev 0xfffc0.f is not supported by this driver
> >>> [ 3.517049] ath: phy0: Unable to initialize hardware; initialization status: -95
> >>> [ 3.524473] ath9k 0000:01:00.0: Failed to initialize device
> >>> [ 3.530081] ath9k: probe of 0000:01:00.0 failed with error -95
> >>> [ 3.536012] ath10k_pci 0000:02:00.0: of_irq_parse_pci: failed with rc=134
> >>> [ 3.543049] pci 0000:00:02.0: enabling device (0140 -> 0142)
> >>> [ 3.548735] ath10k_pci 0000:02:00.0: can't change power state from D3hot to D0 (config space inaccessible)
> >>> [ 3.588592] ath10k_pci 0000:02:00.0: failed to wake up device : -110
> >>> [ 3.595098] ath10k_pci: probe of 0000:02:00.0 failed with error -110
> >>>
> >>> lspci looks OK, though:
> >>>
> >>> # lspci
> >>> 00:01.0 PCI bridge: Marvell Technology Group Ltd. Device 6820 (rev 04)
> >>> 00:02.0 PCI bridge: Marvell Technology Group Ltd. Device 6820 (rev 04)
> >>> 00:03.0 PCI bridge: Marvell Technology Group Ltd. Device 6820 (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 802.11ac Wireless Network Adapter (rev ff)
> >>>
> >>> Does anyone have any clue what could be going on here? Is this 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 with 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 recent
> >> report at https://bugzilla.kernel.org/show_bug.cgi?id=209833 but I
> >> don't think we have a fix yet.
> >
> > Yes! Turning that off does indeed help! Thanks a bunch :)
> >
> > 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 the
bugzilla suggests that it worked in v5.4, which isn't much help.
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?
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 see
if we just need to apply the quirk_enable_clear_retrain_link() quirk.
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index ac0557a305af..afe7fa1d54d6 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -103,7 +103,7 @@ static const char *policy_str[] = {
[POLICY_POWER_SUPERSAVE] = "powersupersave"
};
-#define LINK_RETRAIN_TIMEOUT HZ
+#define LINK_RETRAIN_TIMEOUT (10*HZ)
static int policy_to_aspm_state(struct pcie_link_state *link)
{
@@ -201,7 +201,7 @@ static bool pcie_retrain_link(struct pcie_link_state *link)
pcie_capability_read_word(parent, PCI_EXP_LNKCTL, ®16);
reg16 |= PCI_EXP_LNKCTL_RL;
pcie_capability_write_word(parent, PCI_EXP_LNKCTL, reg16);
- if (parent->clear_retrain_link) {
+ if (1 || parent->clear_retrain_link) {
/*
* Due to an erratum in some devices the Retrain Link bit
* needs to be cleared again manually to allow the link
next prev parent reply other threads:[~2020-10-29 1:00 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-27 15:43 PCI trouble on mvebu (Turris Omnia) Toke Høiland-Jørgensen
2020-10-27 17:20 ` Bjorn Helgaas
2020-10-27 17:44 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-27 18:59 ` Toke Høiland-Jørgensen
2020-10-27 20:20 ` Toke Høiland-Jørgensen
2020-10-27 21:22 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-27 21:31 ` Toke Høiland-Jørgensen
2020-10-27 22:01 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-27 22:12 ` Toke Høiland-Jørgensen
2020-10-27 18:56 ` Toke Høiland-Jørgensen
2020-10-28 13:36 ` Toke Høiland-Jørgensen
2020-10-28 14:42 ` Bjorn Helgaas [this message]
2020-10-28 15:08 ` Toke Høiland-Jørgensen
2020-10-28 16:40 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-28 23:16 ` Bjorn Helgaas
2020-10-29 10:09 ` Pali Rohár
2020-10-29 10:56 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-29 11:12 ` Toke Høiland-Jørgensen
2020-10-29 19:30 ` Bjorn Helgaas
2020-10-29 19:56 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-29 19:57 ` Andrew Lunn
2020-10-29 21:55 ` Thomas Petazzoni
2020-10-29 20:18 ` Toke Høiland-Jørgensen
2020-10-29 22:09 ` Toke Høiland-Jørgensen
2020-10-29 20:58 ` Marek Behun
2020-10-30 10:08 ` Pali Rohár
2020-10-30 10:45 ` Marek Behun
2020-10-29 21:54 ` Thomas Petazzoni
2020-10-29 23:15 ` Toke Høiland-Jørgensen
2020-10-30 8:23 ` Thomas Petazzoni
2020-10-30 10:15 ` Pali Rohár
2020-10-29 10:41 ` Toke Høiland-Jørgensen
2020-10-29 11:18 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-30 11:23 ` Pali Rohár
2020-10-30 13:02 ` Toke Høiland-Jørgensen
2020-10-30 14:23 ` Pali Rohár
2020-10-30 14:54 ` ™֟☻̭҇ Ѽ ҉ ®
2020-10-31 12:49 ` Toke Høiland-Jørgensen
2020-11-02 15:24 ` Pali Rohár
2020-11-02 15:54 ` Toke Høiland-Jørgensen
2020-11-02 16:18 ` ™֟☻̭҇ Ѽ ҉ ®
2020-11-02 16:33 ` Toke Høiland-Jørgensen
2021-03-15 19:58 ` Pali Rohár
2021-03-16 9:25 ` Pali Rohár
2021-03-18 22:43 ` Toke Høiland-Jørgensen
2021-03-18 23:16 ` Pali Rohár
2021-03-26 12:50 ` Pali Rohár
2021-03-26 15:25 ` Toke Høiland-Jørgensen
2021-03-26 15:34 ` Pali Rohár
2021-03-26 16:54 ` Toke Høiland-Jørgensen
2021-03-26 17:11 ` Pali Rohár
2021-03-26 17:51 ` Toke Høiland-Jørgensen
2021-03-29 17:09 ` Pali Rohár
2021-03-31 14:02 ` Toke Høiland-Jørgensen
2021-03-31 16:15 ` Pali Rohár
2021-03-31 16:53 ` Toke Høiland-Jørgensen
2020-10-29 1:21 ` Marek Behun
2020-10-29 15:12 ` Rob Herring
2020-10-27 18:03 ` Marek Behun
2020-10-27 19:00 ` Toke Høiland-Jørgensen
2020-10-27 20:19 ` Marek Behun
2020-10-27 20:49 ` Toke Høiland-Jørgensen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201028144209.GA315566@bjorn-Precision-5520 \
--to=helgaas@kernel.org \
--cc=ilias.apalodimas@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-pci@vger.kernel.org \
--cc=robh@kernel.org \
--cc=toke@redhat.com \
--cc=vtolkm@googlemail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).