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From: Bjorn Helgaas <helgaas@kernel.org>
To: "Pali Rohár" <pali@kernel.org>
Cc: "Marek Behún" <marek.behun@nic.cz>,
	linux-pci@vger.kernel.org, "Jason Cooper" <jason@lakedaemon.net>,
	"Andrew Lunn" <andrew@lunn.ch>,
	"Gregory Clement" <gregory.clement@bootlin.com>,
	"Sebastian Hesselbarth" <sebastian.hesselbarth@gmail.com>,
	"Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
	"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
	"Andrew Murray" <amurray@thegoodpenguin.co.uk>,
	"Remi Pommarel" <repk@triplefau.lt>,
	"Tomasz Maciej Nowak" <tmn505@gmail.com>,
	Xogium <contact@xogium.me>, "Rob Herring" <robh@kernel.org>
Subject: Re: [PATCH v2 4/9] PCI: aardvark: issue PERST via GPIO
Date: Thu, 23 Apr 2020 17:17:14 -0500	[thread overview]
Message-ID: <20200423221714.GA247156@google.com> (raw)
In-Reply-To: <20200423190202.ssbhwoupmssrdcyi@pali>

On Thu, Apr 23, 2020 at 09:02:02PM +0200, Pali Rohár wrote:
> On Thursday 23 April 2020 13:41:51 Bjorn Helgaas wrote:
> > [+cc Rob]
> > 
> > On Tue, Apr 21, 2020 at 01:16:56PM +0200, Marek Behún wrote:
> > > From: Pali Rohár <pali@kernel.org>
> > > 
> > > Add support for issuing PERST via GPIO specified in 'reset-gpios'
> > > property (as described in PCI device tree bindings).
> > > 
> > > Some buggy cards (e.g. Compex WLE900VX or WLE1216) are not detected
> > > after reboot when PERST is not issued during driver initialization.
> > 
> > Does this slot support hotplug?
> 
> I have no idea. I have not heard that anybody tried hotplugging cards
> with this aardvark pcie controller at runtime.
> 
> This patch fixes initialization only at boot time when cards were
> plugged prior powering board on.
> 
> > If so, I don't think this fix will help the hot-add case, will it?
> 
> I even do not know if aardvark HW supports it. And if yes, I think it is
> unimplemented and/or broken.
> 
> In documentation there is some interrupt register which could signal it,
> but I it is not used by kernel's pci-aardvark.c driver.

"lspci -vv" will show you whether the hardware claims to support it,
e.g.,

  00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #1
    Capabilities: [40] Express (v2) Root Port (Slot+), MSI 00
      SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug- Surprise-

If the right combination of bits are set there, pciehp will claim the
port and support hotplug.

Bjorn

  reply	other threads:[~2020-04-23 22:17 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-21 11:16 [PATCH v2 0/9] PCI: aardvark: Fix support for Turris MOX and Compex wifi cards Marek Behún
2020-04-21 11:16 ` [PATCH v2 1/9] PCI: aardvark: train link immediately after enabling training Marek Behún
2020-04-21 11:16 ` [PATCH v2 2/9] PCI: aardvark: don't write to read-only register Marek Behún
2020-04-23 17:27   ` Bjorn Helgaas
2020-04-23 17:51     ` Pali Rohár
2020-04-21 11:16 ` [PATCH v2 3/9] PCI: aardvark: improve link training Marek Behún
2020-04-23 18:39   ` Bjorn Helgaas
2020-04-23 18:56     ` Pali Rohár
2020-04-24 12:49       ` Pali Rohár
2020-04-21 11:16 ` [PATCH v2 4/9] PCI: aardvark: issue PERST via GPIO Marek Behún
2020-04-23 18:41   ` Bjorn Helgaas
2020-04-23 19:02     ` Pali Rohár
2020-04-23 22:17       ` Bjorn Helgaas [this message]
2020-04-23 22:23         ` Pali Rohár
2020-04-23 22:40           ` Bjorn Helgaas
2020-04-24  8:13             ` Pali Rohár
2020-04-24  9:25   ` Pali Rohár
2020-04-21 11:16 ` [PATCH v2 5/9] PCI: aardvark: add FIXME comment for PCIE_CORE_CMD_STATUS_REG access Marek Behún
2020-04-23 18:44   ` Bjorn Helgaas
2020-04-23 19:06     ` Pali Rohár
2020-04-21 11:16 ` [PATCH v2 6/9] PCI: aardvark: add PHY support Marek Behún
2020-04-21 11:16 ` [PATCH v2 7/9] dt-bindings: PCI: aardvark: describe new properties Marek Behún
2020-05-11 18:24   ` Rob Herring
2020-04-21 11:17 ` [PATCH v2 8/9] arm64: dts: marvell: armada-37xx: set pcie_reset_pin to gpio function Marek Behún
2020-04-21 11:17 ` [PATCH v2 9/9] arm64: dts: marvell: armada-37xx: move PCIe comphy handle property Marek Behún
2020-04-21 11:42 ` [PATCH v2 0/9] PCI: aardvark: Fix support for Turris MOX and Compex wifi cards Pali Rohár

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