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From: Fabio Estevam <festevam@gmail.com>
To: Lucas Stach <l.stach@pengutronix.de>
Cc: lorenzo.pieralisi@arm.com, Richard Zhu <hongxing.zhu@nxp.com>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	Tim Harvey <tharvey@gateworks.com>,
	patchwork-lst@pengutronix.de,
	Peter Senna Tschudin <peter.senna@collabora.com>,
	Sascha Hauer <kernel@pengutronix.de>,
	Bjorn Helgaas <bhelgaas@google.com>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] PCI: imx6: fix downstream bus scanning
Date: Wed, 10 May 2017 15:35:17 -0300	[thread overview]
Message-ID: <CAOMZO5BYXx9VmhGrTv44O-njGQsz=GSRp9fA_VbkWapkqY+p=g@mail.gmail.com> (raw)
In-Reply-To: <20170510175752.6519-1-l.stach@pengutronix.de>

Hi Lucas,

On Wed, May 10, 2017 at 2:57 PM, Lucas Stach <l.stach@pengutronix.de> wrote:
> The change in Linux 4.12 to make PCI configuartion requests non-posted
> means that we are now getting a synchronous abort when the CFG space
> read to probe for downstream devices times out.
>
> Synchronous aborts need to be handled differently from the async aborts
> we were getting before, in particular the PC needs to be advanced when
> resolving the abort. This is mostly a copy of what other PCI drivers do
> on ARM to handle those aborts.
>
> Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
> ---
> This is a fix that needs to go in for 4.12, but I would hope to get
> some thorough testing before.

This fixes the kernel crash on my mx6q board with a PCI switch, thanks!

PCI Wifi card is also correctly detected.

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WARNING: multiple messages have this Message-ID (diff)
From: festevam@gmail.com (Fabio Estevam)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] PCI: imx6: fix downstream bus scanning
Date: Wed, 10 May 2017 15:35:17 -0300	[thread overview]
Message-ID: <CAOMZO5BYXx9VmhGrTv44O-njGQsz=GSRp9fA_VbkWapkqY+p=g@mail.gmail.com> (raw)
In-Reply-To: <20170510175752.6519-1-l.stach@pengutronix.de>

Hi Lucas,

On Wed, May 10, 2017 at 2:57 PM, Lucas Stach <l.stach@pengutronix.de> wrote:
> The change in Linux 4.12 to make PCI configuartion requests non-posted
> means that we are now getting a synchronous abort when the CFG space
> read to probe for downstream devices times out.
>
> Synchronous aborts need to be handled differently from the async aborts
> we were getting before, in particular the PC needs to be advanced when
> resolving the abort. This is mostly a copy of what other PCI drivers do
> on ARM to handle those aborts.
>
> Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
> ---
> This is a fix that needs to go in for 4.12, but I would hope to get
> some thorough testing before.

This fixes the kernel crash on my mx6q board with a PCI switch, thanks!

PCI Wifi card is also correctly detected.

  reply	other threads:[~2017-05-10 18:35 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-10 17:57 [PATCH] PCI: imx6: fix downstream bus scanning Lucas Stach
2017-05-10 17:57 ` Lucas Stach
2017-05-10 18:35 ` Fabio Estevam [this message]
2017-05-10 18:35   ` Fabio Estevam
2017-05-10 19:04   ` Fabio Estevam
2017-05-10 19:04     ` Fabio Estevam
2017-05-10 19:51 ` Peter Senna Tschudin
2017-05-10 19:51   ` Peter Senna Tschudin
2017-05-11  2:00 ` Richard Zhu
2017-05-11  2:00   ` Richard Zhu
2017-05-22 22:13 ` Bjorn Helgaas
2017-05-22 22:13   ` Bjorn Helgaas
2017-05-23  9:07   ` Lorenzo Pieralisi
2017-05-23  9:07     ` Lorenzo Pieralisi
2017-05-23 22:11   ` Fabio Estevam
2017-05-23 22:11     ` Fabio Estevam
2017-05-24 17:16     ` Bjorn Helgaas
2017-05-24 17:16       ` Bjorn Helgaas

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