netdev - Legacy features in PCI Express devices

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Message-ID: <ef5c9778-fbae-9f4f-ac2e-29b8597537a5@free.fr>
Date:   Mon, 13 Mar 2017 17:10:57 +0100
From:   Mason <slash.tmp@...e.fr>
To:     linux-pci <linux-pci@...r.kernel.org>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        David Laight <david.laight@...lab.com>,
        Robin Murphy <robin.murphy@....com>,
        Thibaud Cornic <thibaud_cornic@...madesigns.com>,
        Phuong Nguyen <phuong_nguyen@...madesigns.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        netdev <netdev@...r.kernel.org>,
        Tim Harvey <tharvey@...eworks.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Legacy features in PCI Express devices

Hello,

There are two revisions of our PCI Express controller.

Rev 1 did not support the following features:

  1) legacy PCI interrupt delivery (INTx signals)
  2) I/O address space

Internally, someone stated that such missing support would prevent
some PCIe cards from working with our controller.

Are there really modern PCIe cards that require 1) and/or 2)
to function?

Can someone provide examples of such cards, so that I may test them
on both revisions?

I was told to check ath9k-based cards. Any other examples?

Looking around, I came across this thread:
http://lists.infradead.org/pipermail/linux-arm-kernel/2016-March/418254.html
"i.MX6 PCIe: Fix imx6_pcie_deassert_core_reset() polarity"

IIUC, although some PCIe boards do support MSI, the driver might not
put in the work to use that infrastructure, and instead reverts to
legacy interrupts. (So it is a SW issue, in a sense.)

Regards.