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Date: Mon, 04 Apr 2016 12:37:07 +0200
From: khalasa@...p.pl (Krzysztof Hałasa)
To: Tim Harvey <tharvey@...eworks.com>
Cc: Lucas Stach <l.stach@...gutronix.de>,
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
Tim,
> So perhaps there is something else going on with the tw8689
> device/driver that is causing it to not work with MSI. We have an
> avc8000 miniPCIe with tw8689 here and can test if you send me your
> patches that enable tw8689 with msi.
I think you can use this:
http://git.linuxtv.org/hverkuil/media_tree.git/log/?h=tw686x
> Regardless of MSI working in our tests we still disable it because of
> it breaking legacy irqs and for performance reasons.
So do I. However I'm also using Fedora 23 and this means I have to
recompile the kernel, since they build it with MSI enabled.
I think we should fix it, either by disabling in run time, or making it
work.
Performance-wise, I found it "surprising" that one can't have multiple
MSIs with separate hw vector for each.
--
Krzysztof Halasa
Industrial Research Institute for Automation and Measurements PIAP
Al. Jerozolimskie 202, 02-486 Warsaw, Poland
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