linux-kernel - Re: [PATCH v5 1/5] PCI: designware: ensure ATU is enabled before IO/conf space accesses

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Message-ID: <CAHM4w1kzGKahVOTdTxMciZBs81U9EVoSYPgCw9=ph3R9vSwCwQ@mail.gmail.com>
Date:	Fri, 18 Dec 2015 20:11:07 +0530
From:	Pratyush Anand <pratyush.anand@...il.com>
To:	Stanimir Varbanov <stanimir.varbanov@...aro.org>
Cc:	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Jingoo Han <jingoohan1@...il.com>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Subject: Re: [PATCH v5 1/5] PCI: designware: ensure ATU is enabled before
 IO/conf space accesses

On Fri, Dec 18, 2015 at 6:08 PM, Stanimir Varbanov
<stanimir.varbanov@...aro.org> wrote:
> There is no guarantees that enabling ATU will hit the hardware
> immediately, and subsequent accesses to configuration / IO spaces
> are reliable. So fixing this by read back PCIE_ATU_CR2 register
> just after writing.
>
> Without such a fix the PCI device enumeration during kernel boot
> is not reliable, and reading configuration space for particular
> PCI device on the bus returns zero aka no device.
>
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>

Acked-by: Pratyush Anand <pratyush.anand@...il.com>
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