Re: [PATCH] i.MX6 PCIe: Fix imx6_pcie_deassert_core_reset() polarity

From: Krzysztof HaÅasa
Date: Tue Mar 29 2016 - 01:29:41 EST

Tim Harvey <tharvey@xxxxxxxxxxxxx> 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

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