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Message-ID: <m3oa9widxk.fsf@t19.piap.pl>
Date: Wed, 30 Mar 2016 10:10:31 +0200
From: khalasa@...p.pl (Krzysztof Hałasa)
To: Lucas Stach <l.stach@...gutronix.de>
Cc: Tim Harvey <tharvey@...eworks.com>,
Fabio Estevam <festevam@...il.com>,
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
Lucas Stach <l.stach@...gutronix.de> writes:
>> 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 only tries to use normal IRQ.
> There is no upstream driver for this chip, so I don't know where to look
> to find out if the driver tries to enable MSI.
It's been posted on linux-media list... I added pci_enable_msi() to this
driver and it didn't help.
> Is what you are saying that if you enable MSI support in the kernel, it
> breaks legacy IRQs?
Precisely.
However, MSI doesn't seem to work either. Could be a problem specific to
this TW6869 card.
Ventana GW5410 has 5 mPCIe slots, and (with MSI enabled in the system)
those IRQs (non-MSI) don't work in any slot:
304: 0 0 0 0 PCI-MSI 0 Edge PCIe PME, aerdrv
336: 0 0 0 0 GPC 123 Level TW8689 in J7 slot
337: 0 0 0 0 GPC 122 Level TW8689 in J8, J10, J11
338: 0 0 0 0 GPC 121 Level TW8689 in J6)
If I enable MSI on this card (adding pci_enable_msi()):
313: 0 0 0 0 PCI-MSI 9 Edge TW6869 in J7 slot
The only way I can get it to work is by disabling MSI (system wide).
--
Krzysztof Halasa
Industrial Research Institute for Automation and Measurements PIAP
Al. Jerozolimskie 202, 02-486 Warsaw, Poland
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