linux-kernel - Re: [PATCH] i.MX6 PCIe: Fix imx6_pcie_deassert_core

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Date:	Mon, 28 Mar 2016 19:13:18 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	Tim Harvey <tharvey@...eworks.com>
Cc:	Lucas Stach <l.stach@...gutronix.de>,
	Krzysztof Hałasa <khalasa@...p.pl>,
	Petr Štetiar <ynezz@...e.cz>,
	Richard Zhu <Richard.Zhu@...escale.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i.MX6 PCIe: Fix imx6_pcie_deassert_core_reset() polarity

On Mon, Mar 28, 2016 at 7:06 PM, Tim Harvey <tharvey@...eworks.com> wrote:

>> On imx6qdl-sabresd.dtsi the PCI reset gpio polarity is set to high,
>> which is not correct, so the Wifi card could be detected even with
>> 5c5fb40de8f. So two errors in sequence and PCI still works on this
>> board :-)
>
> ouch - two wrongs did make a right!
>
> It's not too easy to tell how many IMX6 boards incorrectly specify
> their reset-gpio polarity. I don't know what the best way to determine
> what boards use the IMX6 pcie host controller. Is there a dtc usage
> that will display the compiled dtb's then we grep out 'compatible =
> "fsl,imx6q-pcie"' to at least get the list of boards to inspect? I'm
> curious if its just one or two boards that incorrectly specify the
> polarity of their PCI reset.

In order to keep old dtb's working we should simply ignore the GPIO
flags passed in the 'reset-gpio' property.

That's why we need a revert. Just sent a v2, BTW.