linux-kernel - Re: [Linaro-acpi] [PATCH V1 11/11] arm64, pci, acpi: Support for ACPI based PCI hostbridge init

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Message-ID: <563B6C52.8020204@codeaurora.org>
Date:	Thu, 5 Nov 2015 09:48:50 -0500
From:	Sinan Kaya <okaya@...eaurora.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	rjw@...ysocki.net, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org,
	will.deacon@....com, ddaney@...iumnetworks.com,
	Narinder.Dhillon@...iumnetworks.com, linaro-acpi@...ts.linaro.org,
	wangyijing@...wei.com, robert.richter@...iumnetworks.com,
	tglx@...utronix.de, catalin.marinas@....com, bhelgaas@...gle.com,
	Liviu.Dudau@....com, jiang.liu@...ux.intel.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [Linaro-acpi] [PATCH V1 11/11] arm64, pci, acpi: Support for ACPI
 based PCI hostbridge init



On 11/3/2015 12:43 PM, Sinan Kaya wrote:
> In any case, the hardware document says 32 bit configuration space
> access to the host bridge only. I'll get more clarification.
>
I got confirmation this morning that this chip supports 32 bit access to 
the root complex configuration space. 8/16/32 bits accesses to the 
endpoints are supported.

>>
>> You can probably work around this by using the legacy I/O port method
>> rather than ECAM, if the PCI host bridge itself is functional and just
>> the host bus it is connected to is buggy.
>
>  From the sounds of it, we'll need a quirk for config space. We support
> legacy I/O only to make the endpoints happy. Some endpoints do not get
> initialized if they don't have a BAR address assigned to all the BAR
> resources.

We'll need an MCFG fix up.

-- 
Sinan Kaya
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a 
Linux Foundation Collaborative Project
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