linux-kernel - Re: [PATCH 2/3] PCI: host: pcie-designware: add support for suspend and resume

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Message-ID: <559FDB97.1090803@ti.com>
Date:	Fri, 10 Jul 2015 20:19:59 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Pratyush Anand <pratyush.anand@...il.com>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jingoo Han <jingoohan1@...il.com>,
	<linux-omap@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <nsekhar@...com>
Subject: Re: [PATCH 2/3] PCI: host: pcie-designware: add support for suspend
 and resume

Hi Pratyush,

On Friday 10 July 2015 06:52 PM, Pratyush Anand wrote:
> Hi Kishon,
> 
> On Fri, Jul 3, 2015 at 4:33 PM, Kishon Vijay Abraham I <kishon@...com> wrote:
>> Certain platforms require MSE bit to be cleared to set the master
>> in standby mode. (In DRA7xx TRM_vE, section 24.9.4.5.2.2.1 PCIe
>> Controller Master Standby Behavior advises to use the clearing
>> of the local MSE bit to set the master in standby. Without this
>> some of the clocks do not idle).
>>
>> Cleared the MSE bit on suspend and enabled it back on resume.
>> This is required to get suspend/resume working.
> 
> Have you tested with a card having IO space memory as well.

I don't have any cards with IO space memory. Do you have any suggestion for
cards with IO space memory?
> I think you might need to require clear and enable PCI_COMMAND_IO
> in suspend and resume respectively.

okay.

Thanks
Kishon
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