linux-kernel - Re: [PATCH v2] memory: Add NVIDIA SMMU suspend/resume support

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Message-ID: <20150109115706.GH16465@ulmo>
Date:	Fri, 9 Jan 2015 12:57:07 +0100
From:	Thierry Reding <thierry.reding@...il.com>
To:	Mark Zhang <markz@...dia.com>
Cc:	gnurou@...il.com, hdoyu@...dia.com, joro@...tes.org,
	swarren@...dotorg.org, olof@...om.net,
	iommu@...ts.linux-foundation.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] memory: Add NVIDIA SMMU suspend/resume support

On Wed, Dec 24, 2014 at 09:10:41AM +0800, Mark Zhang wrote:
> This patch adds suspend/resume support for NVIDIA SMMU.
> 
> Signed-off-by: Mark Zhang <markz@...dia.com>
> ---
> Hi Alex/Olof/Thierry/Hiroshi,
> 
> This patch is created on top of Thierry Reding's patch set:
> "[PATCH v7 00/12] NVIDIA Tegra memory controller and IOMMU support"
> 
> Changes since v1:
> - Remove the list which saves "tegra_smmu_swgroup_asid" instances
> - Save all ASID registers when suspend then restore them when resume
> 
>  drivers/iommu/tegra-smmu.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++
>  drivers/memory/tegra/mc.c  | 24 ++++++++++++++++
>  drivers/memory/tegra/mc.h  |  8 ++++++
>  3 files changed, 103 insertions(+)

We only need this for LP0, right? As such I'm reluctant to apply this
since we can't test it upstream.

Thierry

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