linux-kernel - RE: [PATCH] PCI: Do not enable async suspend for JMicron chips

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Message-ID: <27240C0AC20F114CBF8149A2696CBE4A01EB7B96@SHSMSX101.ccr.corp.intel.com>
Date:	Thu, 6 Nov 2014 05:29:55 +0000
From:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	Barto <mister.freeman@...oste.net>,
	"Tejun Heo (tj@...nel.org)" <tj@...nel.org>,
	"Lu, Aaron" <aaron.lu@...el.com>,
	Rafael Wysocki <rjw@...ysocki.net>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] PCI: Do not enable async suspend for JMicron chips

Hello Bjorn,

> -----Original Message-----
> From: Bjorn Helgaas [mailto:bhelgaas@...gle.com]
> Sent: Thursday, November 06, 2014 12:09 PM
> To: Liu, Chuansheng
> Cc: Barto; Tejun Heo (tj@...nel.org); Lu, Aaron; Rafael Wysocki;
> linux-pci@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH] PCI: Do not enable async suspend for JMicron chips
> 
> On Wed, Nov 5, 2014 at 6:48 PM, Liu, Chuansheng
> <chuansheng.liu@...el.com> wrote:
> > Hello Bjorn,
> >
> >> -----Original Message-----
> >> From: Bjorn Helgaas [mailto:bhelgaas@...gle.com]
> >> Sent: Thursday, November 06, 2014 3:04 AM
> >> To: Barto
> >> Cc: Liu, Chuansheng; Lu, Aaron; Tejun Heo; Rafael Wysocki;
> >> linux-pci@...r.kernel.org; linux-kernel@...r.kernel.org
> >> Subject: Re: [PATCH] PCI: Do not enable async suspend for JMicron chips
> >>
> >> On Wed, Nov 5, 2014 at 11:46 AM, Barto <mister.freeman@...oste.net>
> >> wrote:
> >> > this patch solves these 2 bug reports :
> >> >
> >> > https://bugzilla.kernel.org/show_bug.cgi?id=84861
> >> >
> >> > https://bugzilla.kernel.org/show_bug.cgi?id=81551
> >>
> >> Those bugs were already mentioned.  But e6b7e41cdd8c claims to solve
> >> https://bugzilla.kernel.org/show_bug.cgi?id=81551, and 84861 is a
> >> duplicate of 81551, so it should also be fixed by e6b7e41cdd8c.
> >>
> >> So the question is, why was e6b7e41cdd8c insufficient?  Presumably it
> >> was tested and somebody thought it did fix the problem.
> >
> > The first patch e6b7e41cdd8c which is just exclude some of JMicron
> chips(363/361) out of async_suspend,
> > then Barto found the same issue on JMicron 368, so we need one more
> general patch to let JMicron chips
> > out of async_suspend, so we make this patch.
> >
> > Bjorn, tj,
> > Could you kindly take this patch? As Barto said, it effected the user
> experience indeed, thanks.
> 
> Thanks for clarifying the changelog as far as the different chips and
> the different bugzillas.
> 
> But you haven't addressed my concerns about (1) putting a PCI vendor
> ID check in the generic PCI core code, and (2) applying this to *all*
> JMicron devices.  You might want to explore a quirk-type solution or
> maybe just add the JMicron 368 to the checks added by e6b7e41cdd8c.
Understand your point, in fact, before this patch submitted, I had written another patch https://lkml.org/lkml/2014/9/24/68
which addressed to add the quirk-type solution in ATA code, and Aaron given better suggestion that implemented at pci_pm_init().
How do you think of it? Thanks.