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

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Date:	Tue, 29 Mar 2016 15:12:41 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Lucas Stach <l.stach@...gutronix.de>,
	Krzysztof Hałasa <khalasa@...p.pl>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Tim Harvey <tharvey@...eworks.com>,
	Richard Zhu <Richard.Zhu@...escale.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Petr Štetiar <ynezz@...e.cz>,
	Fabio Estevam <festevam@...il.com>
Subject: Re: [PATCH] i.MX6 PCIe: Fix imx6_pcie_deassert_core_reset() polarity

On Tuesday 29 March 2016 12:55:21 Lucas Stach wrote:
> Am Dienstag, den 29.03.2016, 12:39 +0200 schrieb Krzysztof Hałasa:
> > Lucas Stach <l.stach@...gutronix.de> writes:
> > 
> > > Is this working with v4.4 and PCI_MSI enabled? I'm sure I've tested MSI
> > > IRQs before enabling them in the defconfig and they have been working
> > > for me for a long time before that. Tested with i210 on Gateworks
> > > Ventana.
> > 
> > MSI never worked for me on Ventana. I have been using 4.2 extensively,
> > and now I'm switching to 4.5 (which doesn't work either).
> > 
> > Could it be a DTS (bridge) problem(?)
> > 
> > On 4.5, trying to use it with TW6869 frame buffer and GW5410:
> > 
> > TW6869: PCI 0000:04:00.0, IRQ 336, MMIO 0x1100000
> > TW686x 0000:04:00.0: enabling device (0140 -> 0142)
> > 
> I don't see whee the device even tries to use MSI IRQs. Even if the
> infrastructure is enabled it opts to use legacy INTA.

It just never calls pci_enable_msi(), right? MSI is purely opt-in
for the driver, but it should just work if the device supports it
and you add that call.

	Arnd