From: Stanimir Varbanov <svarbanov@mm-sol.com>
To: Bjorn Helgaas <bhelgaas@google.com>
Cc: Pratyush Anand <pratyush.anand@gmail.com>,
Stanimir Varbanov <stanimir.varbanov@linaro.org>,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
Russell King <linux@arm.linux.org.uk>,
Rob Herring <robh+dt@kernel.org>, Rob Herring <robh@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Pawel Moll <pawel.moll@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Arnd Bergmann <arnd@arndb.de>, Jingoo Han <jingoohan1@gmail.com>,
Bjorn Andersson <bjorn.andersson@sonymobile.com>
Subject: Re: [PATCH v5 1/5] PCI: designware: ensure ATU is enabled before IO/conf space accesses
Date: Mon, 4 Jan 2016 16:31:27 +0200 [thread overview]
Message-ID: <568A823F.5090209@mm-sol.com> (raw)
In-Reply-To: <CAHM4w1kzGKahVOTdTxMciZBs81U9EVoSYPgCw9=ph3R9vSwCwQ@mail.gmail.com>
On 12/18/2015 04:41 PM, Pratyush Anand wrote:
> On Fri, Dec 18, 2015 at 6:08 PM, Stanimir Varbanov
> <stanimir.varbanov@linaro.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@linaro.org>
>
> Acked-by: Pratyush Anand <pratyush.anand@gmail.com>
Bjorn, Do you want to resend the whole patchset with collected acks and
tested tags?
--
regards,
Stan
next prev parent reply other threads:[~2016-01-04 14:31 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-18 12:38 [PATCH v5 0/5] Qualcomm PCIe driver and designware fixes Stanimir Varbanov
2015-12-18 12:38 ` [PATCH v5 1/5] PCI: designware: ensure ATU is enabled before IO/conf space accesses Stanimir Varbanov
2015-12-18 14:41 ` Pratyush Anand
2016-01-04 14:31 ` Stanimir Varbanov [this message]
2016-01-06 18:20 ` Bjorn Helgaas
2016-01-07 6:33 ` Jisheng Zhang
2015-12-18 12:38 ` [PATCH v5 2/5] DT: PCI: qcom: Document PCIe devicetree bindings Stanimir Varbanov
2015-12-18 12:38 ` [PATCH v5 3/5] PCI: qcom: Add Qualcomm PCIe controller driver Stanimir Varbanov
2015-12-18 13:44 ` [PATCH] PCI: qcom: fix ptr_ret.cocci warnings kbuild test robot
2015-12-18 13:44 ` [PATCH v5 3/5] PCI: qcom: Add Qualcomm PCIe controller driver kbuild test robot
2015-12-20 23:10 ` Bjorn Andersson
2015-12-21 23:04 ` Arnd Bergmann
2015-12-18 12:38 ` [PATCH v5 4/5] ARM: dts: apq8064: add pcie devicetree node Stanimir Varbanov
2015-12-18 12:38 ` [PATCH v5 5/5] ARM: dts: ifc6410: enable pcie dt node for this board Stanimir Varbanov
2016-01-05 21:42 ` [PATCH v5 0/5] Qualcomm PCIe driver and designware fixes Bjorn Helgaas
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