Messages in this thread | | | From | (Krzysztof Hałasa) | Subject | Re: [PATCH] i.MX6 PCIe: Fix imx6_pcie_deassert_core_reset() polarity | Date | Wed, 30 Mar 2016 10:10:31 +0200 |
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Lucas Stach <l.stach@pengutronix.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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