From: Joakim Zhang <qiangqing.zhang@nxp.com>
To: Jon Hunter <jonathanh@nvidia.com>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-tegra <linux-tegra@vger.kernel.org>,
Jakub Kicinski <kuba@kernel.org>
Subject: RE: Regression v5.12-rc3: net: stmmac: re-init rx buffers when mac resume back
Date: Wed, 31 Mar 2021 07:43:30 +0000 [thread overview]
Message-ID: <DB8PR04MB6795F4333BCA9CE83C288FEEE67C9@DB8PR04MB6795.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <ac9f8a31-536e-ec75-c73f-14a0623c5d56@nvidia.com>
> -----Original Message-----
> From: Jon Hunter <jonathanh@nvidia.com>
> Sent: 2021年3月30日 20:51
> To: Joakim Zhang <qiangqing.zhang@nxp.com>
> Cc: netdev@vger.kernel.org; Linux Kernel Mailing List
> <linux-kernel@vger.kernel.org>; linux-tegra <linux-tegra@vger.kernel.org>;
> Jakub Kicinski <kuba@kernel.org>
> Subject: Re: Regression v5.12-rc3: net: stmmac: re-init rx buffers when mac
> resume back
>
>
>
> On 25/03/2021 08:12, Joakim Zhang wrote:
>
> ...
>
> >>>>> You mean one of your boards? Does other boards with STMMAC can
> >>>>> work
> >>>> fine?
> >>>>
> >>>> We have two devices with the STMMAC and one works OK and the other
> >> fails.
> >>>> They are different generation of device and so there could be some
> >>>> architectural differences which is causing this to only be seen on one
> device.
> >>> It's really strange, but I also don't know what architectural
> >>> differences could
> >> affect this. Sorry.
>
>
> I realised that for the board which fails after this change is made, it has the
> IOMMU enabled. The other board does not at the moment (although work is in
> progress to enable). If I add 'iommu.passthrough=1' to cmdline for the failing
> board, then it works again. So in my case, the problem is linked to the IOMMU
> being enabled.
>
> Does you platform enable the IOMMU?
Hi Jon,
There is no IOMMU hardware available on our boards. But why IOMMU would affect it during suspend/resume, and no problem in normal mode?
Best Regards,
Joakim Zhang
> Thanks
> Jon
>
> --
> nvpublic
next prev parent reply other threads:[~2021-03-31 7:44 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-24 10:50 Regression v5.12-rc3: net: stmmac: re-init rx buffers when mac resume back Jon Hunter
2021-03-24 12:20 ` Joakim Zhang
2021-03-24 12:39 ` Jon Hunter
2021-03-25 7:53 ` Joakim Zhang
2021-03-25 8:00 ` Jon Hunter
2021-03-25 8:12 ` Joakim Zhang
2021-03-30 12:50 ` Jon Hunter
2021-03-31 7:43 ` Joakim Zhang [this message]
2021-03-31 11:10 ` Joakim Zhang
2021-03-31 11:29 ` Jon Hunter
2021-03-31 11:41 ` Joakim Zhang
2021-04-01 16:28 ` Jon Hunter
2021-04-13 8:41 ` Jon Hunter
2021-04-13 12:13 ` Joakim Zhang
2021-04-13 16:06 ` Thierry Reding
2021-04-13 16:43 ` Jakub Kicinski
2021-04-14 2:18 ` Joakim Zhang
2021-04-14 7:40 ` Thierry Reding
2021-04-14 8:06 ` Joakim Zhang
2021-04-14 12:22 ` Joakim Zhang
2021-03-31 11:11 ` Jon Hunter
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