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

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Date:	Wed, 30 Mar 2016 14:06:44 +0200
From:	Petr Štetiar <ynezz@...e.cz>
To:	Krzysztof Hałasa <khalasa@...p.pl>
Cc:	Petr Štetiar <ynezz@...e.cz>,
	Richard Zhu <Richard.Zhu@...escale.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Marcel Ziswiler <marcel.ziswiler@...adex.com>,
	Stefan Agner <stefan@...er.ch>
Subject: Re: [PATCH] i.MX6 PCIe: Fix imx6_pcie_deassert_core_reset()
	polarity

Krzysztof Hałasa <khalasa@...p.pl> [2016-03-25 14:32:35]:

Cześć,

> I wonder if all boards (except maybe that Toradex set) use an active-low
> PCIe reset and are now broken. Perhaps Toradex uses active-high and thus
> works.

I'm really puzzled by this :-) With your patch applied I get following on
Toradex Apalis modules:

 DTS:         reset-gpio = <&gpio1 28 GPIO_ACTIVE_LOW>;
 dmesg:       imx6q-pcie 1ffc000.pcie: phy link never came up
 gpio:        gpio-28  (                    |reset               ) out hi
 pin voltage: 0V

 DTS:         reset-gpio = <&gpio1 28 GPIO_ACTIVE_HIGH>;
 dmesg:       ath9k 0000:01:00.0: enabling device (0140 -> 0142)
 gpio:        gpio-28  (                    |reset               ) out lo
 pin voltage: 3V3

So Toradex Apalis is actually active-high? Thanks.

-- ynezz