From mboxrd@z Thu Jan  1 00:00:00 1970
From: Zhou Wang <wangzhou1@hisilicon.com>
Subject: Re: [RFC PATCH v1 1/3] PCI: designware: Add ARM64 support
Date: Wed, 27 May 2015 21:56:27 +0800
Message-ID: <5565CD0B.6020206@hisilicon.com>
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To: Arnd Bergmann <arnd@arndb.de>
Cc: Fabrice Gasnier <fabrice.gasnier@st.com>, Jingoo Han <jingoohan1@gmail.com>, zhudacai@hisilicon.com, devicetree@vger.kernel.org, 'Gabriele Paoloni' <gabriele.paoloni@huawei.com>, 'Richard Zhu' <Richard.Zhu@freescale.com>, linux-pci@vger.kernel.org, 'Pratyush Anand' <pratyush.anand@gmail.com>, 'Liviu Dudau' <liviu.dudau@arm.com>, 'Zhichang Yuan' <yuanzhichang@hisilicon.com>, 'Kishon Vijay Abraham I' <kishon@ti.com>, qiuzhenfa@hisilicon.com, 'Bjorn Helgaas' <bhelgaas@google.com>, 'Zhang Jukuo' <zhangjukuo@huawei.com>, 'Liguozhu' <liguozhu@hisilicon.com>, linux-arm-kernel@lists.infradead.org, 'Lucas Stach' <l.stach@pengutronix.de>
List-Id: devicetree@vger.kernel.org

On 2015/5/26 16:02, Arnd Bergmann wrote:
> On Tuesday 26 May 2015 10:49:51 Zhou Wang wrote:
>>
>> I am a little confused that pci_sys_data is still needed as we don't use the code
>> in bios32. What was the problem you met? Could you share me more information? Then
>> let's see how to solve the problem.
>>
> 
> The PCI core code still calls pcibios_align_resource(), which will try to
> use the dev->sysdata pointer as 'struct pci_sys_data'. To solve this, we

Thanks for reminding.

> need to change the pci-mvebu driver and the core code first to let the

It seams that only pci-mvebu implemented align_resource callback in ARM ?

> driver override pcibios_align_resource() through an operation in 
> struct pci_host_bridge.
> 
> The other remaining use of dev->sysdata is the ARM pcibios_msi_controller()
> function that overrides the generic implementation.  To solve this, we need
> to change the five remaining drivers that set hw_pci->msi_ctrl to use
> the new generic method, and remove the ARM specific implementation.

Yes, that is better if we can do like this. But for pcie-designware, can we
just set bus->msi = &dw_pcie_msi_chip and get msi controller using dev->bus->msi
in pci_msi_controller()?

Best Regards,
Zhou

> 
> 	Arnd
> 
> .
>