linux-kernel - Re: [PATCH v2] PCI: designware: move remaining rc setup code to dw_pcie_setup

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Date:	Thu, 7 Apr 2016 12:29:09 +0530
From:	Pratyush Anand <pratyush.anand@...il.com>
To:	Gabriele Paoloni <gabriele.paoloni@...wei.com>
Cc:	Jisheng Zhang <jszhang@...vell.com>,
	"jingoohan1@...il.com" <jingoohan1@...il.com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] PCI: designware: move remaining rc setup code to dw_pcie_setup_rc()

Hi Gab,

Thanks for bringing it.


On Wed, Apr 6, 2016 at 8:20 PM, Gabriele Paoloni
<gabriele.paoloni@...wei.com> wrote:
> Hi, sorry to be late on this
>
>> -----Original Message-----
>> From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel-
>> owner@...r.kernel.org] On Behalf Of Jisheng Zhang
>> Sent: 16 March 2016 11:41
>> To: jingoohan1@...il.com; pratyush.anand@...il.com; bhelgaas@...gle.com
>> Cc: linux-pci@...r.kernel.org; linux-kernel@...r.kernel.org; linux-arm-
>> kernel@...ts.infradead.org; Jisheng Zhang
>> Subject: [PATCH v2] PCI: designware: move remaining rc setup code to
>> dw_pcie_setup_rc()
>>
>> dw_pcie_setup_rc(), as its name indicates, setups the RC. But current
>> dw_pcie_host_init() also contains some necessary rc setup code.
>>
>> Another reason: the host may lost power during suspend to ram, the RC
>> need to be re-setup after resume. The rc can't be correctly resumed
>> without the rc setup code in dw_pcie_host_init().
>>
>> So this patch moves the code to dw_pcie_setup_rc() to address the above
>> two issues. After this patch, each pcie designware driver users could
>> call dw_pcie_setup_rc() to re-setup rc when resume back.
>
> I think this patch breaks the Hisilicon driver...
>
> Our driver performs linkup setup in UEFI therefore we do not call
> dw_pcie_setup_rc(), we only call dw_pcie_host_init().
>
> Maybe better to group the part of code to be moved in as separate
> function...
>
> Thanks and sorry for late reply.
>

I am just wondering, should n't then what ever we do in
dw_pcie_setup_rc() be done in your boot loader and not just link up.

~Pratyush