linux-kernel - Re: [PATCH v3 2/2] PCI: imx6: limit DBI register length

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Date:   Wed, 21 Nov 2018 13:47:05 +0000
From:   Leonard Crestez <leonard.crestez@....com>
To:     "stefan@...er.ch" <stefan@...er.ch>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>
CC:     Trent Piepho <tpiepho@...inj.com>,
        Richard Zhu <hongxing.zhu@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jingoohan1@...il.com" <jingoohan1@...il.com>,
        "gustavo.pimentel@...opsys.com" <gustavo.pimentel@...opsys.com>,
        "andrew.smirnov@...il.com" <andrew.smirnov@...il.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>
Subject: Re: [PATCH v3 2/2] PCI: imx6: limit DBI register length

On 11/20/2018 11:28 PM, Trent Piepho wrote:
> On Tue, 2018-11-20 at 21:42 +0100, Stefan Agner wrote:
>> On 20.11.2018 20:13, Trent Piepho wrote:

>>> It also seems to me that this doesn't need to be in the internal pci
>>> config access functions.  The driver shouldn't be reading registers
>>> that don't exist anyway.  It's really about trying to fix sysfs access
>>> to registers that don't exist.  So maybe it should be done there.
>>
>> That was my first approach, see:
> 
> Yes, but that just used the pci device id which applies to every IMX
> design.
> 
> It's also not totally correct, as it seems real registers after 0x200
> do work on imx6, and that would prevent access to them.

I see that Lorenzo already accepted the patch in pci/dwc:

https://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/pci.git/commit/?h=pci/dwc&id=f14eaec153aaebbe940ddd21e4198cc2abc927c2

My tests show that this series breaks pci cards on 6qdl and I think it 
should be reverted until a fix is found. Are you OK with this?

Fixing might require an entirely different approach.