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

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Date:	Tue, 29 Mar 2016 07:29:33 +0200
From:	khalasa@...p.pl (Krzysztof Hałasa)
To:	Tim Harvey <tharvey@...eworks.com>
Cc:	Fabio Estevam <festevam@...il.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Petr Štetiar <ynezz@...e.cz>,
	Richard Zhu <Richard.Zhu@...escale.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci\@vger.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-arm-kernel\@lists.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

Tim Harvey <tharvey@...eworks.com> writes:

> 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.

I guess, maybe 8 of them. Not counting those with out-of-tree DTS/DTB
files.

Something like:
$ grep reset-gpio arch/arm/boot/dts/imx6* | grep -v phy-reset

> I figured out it was the change to enable CONFIG_PCI_MSI in v4.5 that
> is causing interrupts to fail for me.

Right, a long standing issue. MSI never worked for me on i.MX6.
-- 
Krzysztof Halasa

Industrial Research Institute for Automation and Measurements PIAP
Al. Jerozolimskie 202, 02-486 Warsaw, Poland