[03/10] memory: tegra: Push suspend/resume into SoC drivers

Message ID	20210420165237.3523732-4-thierry.reding@gmail.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <SRS0=0nsL=JR=lists.infradead.org=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@kernel.org> DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5A4036135F From: Thierry Reding <thierry.reding@gmail.com> To: Thierry Reding <thierry.reding@gmail.com>, Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Cc: Jon Hunter <jonathanh@nvidia.com>, Dmitry Osipenko <digetx@gmail.com>, linux-tegra@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 03/10] memory: tegra: Push suspend/resume into SoC drivers Date: Tue, 20 Apr 2021 18:52:31 +0200 Message-Id: <20210420165237.3523732-4-thierry.reding@gmail.com> In-Reply-To: <20210420165237.3523732-1-thierry.reding@gmail.com> References: <20210420165237.3523732-1-thierry.reding@gmail.com> MIME-Version: 1.0 Precedence: list Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" <linux-arm-kernel-bounces@lists.infradead.org> Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org
Series	memory: tegra: Driver unification \| expand [00/10] memory: tegra: Driver unification [02/10] memory: tegra: Unify struct tegra_mc across SoC generations [03/10] memory: tegra: Push suspend/resume into SoC drivers [04/10] memory: tegra: Make per-SoC setup more generic [05/10] memory: tegra: Extract setup code into callback [06/10] memory: tegra: Parameterize interrupt handler [07/10] memory: tegra: Only initialize reset controller if available [08/10] memory: tegra: Unify drivers [09/10] memory: tegra: Add memory client IDs to tables

Message ID

20210420165237.3523732-4-thierry.reding@gmail.com (mailing list archive)

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DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5A4036135F
From: Thierry Reding <thierry.reding@gmail.com>
To: Thierry Reding <thierry.reding@gmail.com>,
 Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Cc: Jon Hunter <jonathanh@nvidia.com>, Dmitry Osipenko <digetx@gmail.com>,
 linux-tegra@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: [PATCH 03/10] memory: tegra: Push suspend/resume into SoC drivers
Date: Tue, 20 Apr 2021 18:52:31 +0200
Message-Id: <20210420165237.3523732-4-thierry.reding@gmail.com>
In-Reply-To: <20210420165237.3523732-1-thierry.reding@gmail.com>
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Series

memory: tegra: Driver unification | expand

Commit Message

Thierry Reding April 20, 2021, 4:52 p.m. UTC

From: Thierry Reding <treding@nvidia.com>

Continuing the scheme of unification, push suspend/resume callbacks into
per-SoC driver so that they can be properly parameterized.

While at it, also move the ->init() callback into the new tegra_mc_ops
structure to keep things clean.

Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 drivers/memory/tegra/mc.c       | 24 ++++++++---------------
 drivers/memory/tegra/tegra186.c | 27 ++++++++++++++++++++++----
 drivers/memory/tegra/tegra20.c  | 34 ++++++++++++++++++++++++++++++++-
 include/soc/tegra/mc.h          |  9 +++++++--
 4 files changed, 71 insertions(+), 23 deletions(-)

Comments

Dmitry Osipenko April 22, 2021, 12:06 a.m. UTC | #1

20.04.2021 19:52, Thierry Reding пишет:
> -static int tegra_mc_suspend(struct device *dev)
> +static int __maybe_unused tegra_mc_suspend(struct device *dev)
>  {
>  	struct tegra_mc *mc = dev_get_drvdata(dev);
> -	int err;
>  
> -	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && mc->gart) {
> -		err = tegra_gart_suspend(mc->gart);
> -		if (err)
> -			return err;
> -	}
> +	if (mc->soc->ops && mc->soc->ops->suspend)
> +		return mc->soc->ops->suspend(mc);
>  
>  	return 0;
>  }
>  
> -static int tegra_mc_resume(struct device *dev)
> +static int __maybe_unused tegra_mc_resume(struct device *dev)
>  {
>  	struct tegra_mc *mc = dev_get_drvdata(dev);
> -	int err;
>  
> -	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && mc->gart) {
> -		err = tegra_gart_resume(mc->gart);
> -		if (err)
> -			return err;
> -	}
> +	if (mc->soc->ops && mc->soc->ops->resume)
> +		return mc->soc->ops->resume(mc);
>  
>  	return 0;
>  }

You added __maybe_unused, but haven't changed tegra_mc_pm_ops to use
SET_SYSTEM_SLEEP_PM_OPS(), so the functions are always used.

Krzysztof Kozlowski April 26, 2021, 8:47 a.m. UTC | #2

On 20/04/2021 18:52, Thierry Reding wrote:
> From: Thierry Reding <treding@nvidia.com>
> 
> Continuing the scheme of unification, push suspend/resume callbacks into
> per-SoC driver so that they can be properly parameterized.
> 
> While at it, also move the ->init() callback into the new tegra_mc_ops
> structure to keep things clean.

Please split this part. This is just moving pointer from one structure
to another, quite small change.

The rest of the patchset is quite different - you now call
tegra_mc_suspend() from a per-SoC driver and move the code around.

> 
> Signed-off-by: Thierry Reding <treding@nvidia.com>
> ---
>  drivers/memory/tegra/mc.c       | 24 ++++++++---------------
>  drivers/memory/tegra/tegra186.c | 27 ++++++++++++++++++++++----
>  drivers/memory/tegra/tegra20.c  | 34 ++++++++++++++++++++++++++++++++-
>  include/soc/tegra/mc.h          |  9 +++++++--
>  4 files changed, 71 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
> index b7e104bf6614..2b21131d779c 100644
> --- a/drivers/memory/tegra/mc.c
> +++ b/drivers/memory/tegra/mc.c
> @@ -829,8 +829,8 @@ static int tegra_mc_probe(struct platform_device *pdev)
>  
>  	mc->debugfs.root = debugfs_create_dir("mc", NULL);
>  
> -	if (mc->soc->init) {
> -		err = mc->soc->init(mc);
> +	if (mc->soc->ops && mc->soc->ops->init) {
> +		err = mc->soc->ops->init(mc);
>  		if (err < 0)
>  			dev_err(&pdev->dev, "failed to initialize SoC driver: %d\n",
>  				err);
> @@ -867,30 +867,22 @@ static int tegra_mc_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -static int tegra_mc_suspend(struct device *dev)
> +static int __maybe_unused tegra_mc_suspend(struct device *dev)
>  {
>  	struct tegra_mc *mc = dev_get_drvdata(dev);
> -	int err;
>  
> -	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && mc->gart) {
> -		err = tegra_gart_suspend(mc->gart);
> -		if (err)
> -			return err;
> -	}
> +	if (mc->soc->ops && mc->soc->ops->suspend)
> +		return mc->soc->ops->suspend(mc);
>  
>  	return 0;
>  }
>  
> -static int tegra_mc_resume(struct device *dev)
> +static int __maybe_unused tegra_mc_resume(struct device *dev)
>  {
>  	struct tegra_mc *mc = dev_get_drvdata(dev);
> -	int err;
>  
> -	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && mc->gart) {
> -		err = tegra_gart_resume(mc->gart);
> -		if (err)
> -			return err;
> -	}
> +	if (mc->soc->ops && mc->soc->ops->resume)
> +		return mc->soc->ops->resume(mc);
>  
>  	return 0;
>  }
> diff --git a/drivers/memory/tegra/tegra186.c b/drivers/memory/tegra/tegra186.c
> index 8e77567d1378..9d3fdb609d55 100644
> --- a/drivers/memory/tegra/tegra186.c
> +++ b/drivers/memory/tegra/tegra186.c
> @@ -45,6 +45,17 @@ static void tegra186_mc_program_sid(struct tegra_mc *mc)
>  	}
>  }
>  
> +static int tegra186_mc_resume(struct tegra_mc *mc)
> +{
> +	tegra186_mc_program_sid(mc);
> +
> +	return 0;
> +}
> +
> +static const struct tegra_mc_ops tegra186_mc_ops = {
> +	.resume = tegra186_mc_resume,
> +};
> +
>  #if defined(CONFIG_ARCH_TEGRA_186_SOC)
>  static const struct tegra_mc_client tegra186_mc_clients[] = {
>  	{
> @@ -701,6 +712,7 @@ static const struct tegra_mc_client tegra186_mc_clients[] = {
>  static const struct tegra_mc_soc tegra186_mc_soc = {
>  	.num_clients = ARRAY_SIZE(tegra186_mc_clients),
>  	.clients = tegra186_mc_clients,
> +	.ops = &tegra186_mc_ops,
>  };
>  #endif
>  
> @@ -1909,6 +1921,7 @@ static const struct tegra_mc_client tegra194_mc_clients[] = {
>  static const struct tegra_mc_soc tegra194_mc_soc = {
>  	.num_clients = ARRAY_SIZE(tegra194_mc_clients),
>  	.clients = tegra194_mc_clients,
> +	.ops = &tegra186_mc_ops,
>  };
>  #endif
>  
> @@ -1961,22 +1974,28 @@ static const struct of_device_id tegra186_mc_of_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, tegra186_mc_of_match);
>  
> -static int __maybe_unused tegra186_mc_suspend(struct device *dev)
> +static int __maybe_unused tegra_mc_suspend(struct device *dev)
>  {
> +	struct tegra_mc *mc = dev_get_drvdata(dev);
> +
> +	if (mc->soc->ops && mc->soc->ops->suspend)
> +		return mc->soc->ops->suspend(mc);
> +
>  	return 0;
>  }
>  
> -static int __maybe_unused tegra186_mc_resume(struct device *dev)
> +static int __maybe_unused tegra_mc_resume(struct device *dev)
>  {
>  	struct tegra_mc *mc = dev_get_drvdata(dev);
>  
> -	tegra186_mc_program_sid(mc);
> +	if (mc->soc->ops && mc->soc->ops->resume)
> +		return mc->soc->ops->resume(mc);
>  
>  	return 0;
>  }
>  
>  static const struct dev_pm_ops tegra186_mc_pm_ops = {
> -	SET_SYSTEM_SLEEP_PM_OPS(tegra186_mc_suspend, tegra186_mc_resume)
> +	SET_SYSTEM_SLEEP_PM_OPS(tegra_mc_suspend, tegra_mc_resume)

What's the benefit here? You basically define your own suspend-resume
ops, on top of PM suspend-resume ops... Before it was quite obvious code
- the Tegra186 MC driver had very simple suspend/resume which did simple
job. Now it feels like trickier code to follow - Tegra186 driver calls
it's resume (with the same name as others - another confusion) which is
a simple wrapper calling somewhere else (need to jump to assinment of
resume()).


Best regards,
Krzysztof

Thierry Reding April 26, 2021, 12:24 p.m. UTC | #3

On Mon, Apr 26, 2021 at 10:47:11AM +0200, Krzysztof Kozlowski wrote:
> On 20/04/2021 18:52, Thierry Reding wrote:
> > From: Thierry Reding <treding@nvidia.com>
> > 
> > Continuing the scheme of unification, push suspend/resume callbacks into
> > per-SoC driver so that they can be properly parameterized.
> > 
> > While at it, also move the ->init() callback into the new tegra_mc_ops
> > structure to keep things clean.
> 
> Please split this part. This is just moving pointer from one structure
> to another, quite small change.
> 
> The rest of the patchset is quite different - you now call
> tegra_mc_suspend() from a per-SoC driver and move the code around.

Okay, I think I can split that off into a separate patch.

> > Signed-off-by: Thierry Reding <treding@nvidia.com>
> > ---
> >  drivers/memory/tegra/mc.c       | 24 ++++++++---------------
> >  drivers/memory/tegra/tegra186.c | 27 ++++++++++++++++++++++----
> >  drivers/memory/tegra/tegra20.c  | 34 ++++++++++++++++++++++++++++++++-
> >  include/soc/tegra/mc.h          |  9 +++++++--
> >  4 files changed, 71 insertions(+), 23 deletions(-)
> > 
> > diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
> > index b7e104bf6614..2b21131d779c 100644
> > --- a/drivers/memory/tegra/mc.c
> > +++ b/drivers/memory/tegra/mc.c
> > @@ -829,8 +829,8 @@ static int tegra_mc_probe(struct platform_device *pdev)
> >  
> >  	mc->debugfs.root = debugfs_create_dir("mc", NULL);
> >  
> > -	if (mc->soc->init) {
> > -		err = mc->soc->init(mc);
> > +	if (mc->soc->ops && mc->soc->ops->init) {
> > +		err = mc->soc->ops->init(mc);
> >  		if (err < 0)
> >  			dev_err(&pdev->dev, "failed to initialize SoC driver: %d\n",
> >  				err);
> > @@ -867,30 +867,22 @@ static int tegra_mc_probe(struct platform_device *pdev)
> >  	return 0;
> >  }
> >  
> > -static int tegra_mc_suspend(struct device *dev)
> > +static int __maybe_unused tegra_mc_suspend(struct device *dev)
> >  {
> >  	struct tegra_mc *mc = dev_get_drvdata(dev);
> > -	int err;
> >  
> > -	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && mc->gart) {
> > -		err = tegra_gart_suspend(mc->gart);
> > -		if (err)
> > -			return err;
> > -	}
> > +	if (mc->soc->ops && mc->soc->ops->suspend)
> > +		return mc->soc->ops->suspend(mc);
> >  
> >  	return 0;
> >  }
> >  
> > -static int tegra_mc_resume(struct device *dev)
> > +static int __maybe_unused tegra_mc_resume(struct device *dev)
> >  {
> >  	struct tegra_mc *mc = dev_get_drvdata(dev);
> > -	int err;
> >  
> > -	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && mc->gart) {
> > -		err = tegra_gart_resume(mc->gart);
> > -		if (err)
> > -			return err;
> > -	}
> > +	if (mc->soc->ops && mc->soc->ops->resume)
> > +		return mc->soc->ops->resume(mc);
> >  
> >  	return 0;
> >  }
> > diff --git a/drivers/memory/tegra/tegra186.c b/drivers/memory/tegra/tegra186.c
> > index 8e77567d1378..9d3fdb609d55 100644
> > --- a/drivers/memory/tegra/tegra186.c
> > +++ b/drivers/memory/tegra/tegra186.c
> > @@ -45,6 +45,17 @@ static void tegra186_mc_program_sid(struct tegra_mc *mc)
> >  	}
> >  }
> >  
> > +static int tegra186_mc_resume(struct tegra_mc *mc)
> > +{
> > +	tegra186_mc_program_sid(mc);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct tegra_mc_ops tegra186_mc_ops = {
> > +	.resume = tegra186_mc_resume,
> > +};
> > +
> >  #if defined(CONFIG_ARCH_TEGRA_186_SOC)
> >  static const struct tegra_mc_client tegra186_mc_clients[] = {
> >  	{
> > @@ -701,6 +712,7 @@ static const struct tegra_mc_client tegra186_mc_clients[] = {
> >  static const struct tegra_mc_soc tegra186_mc_soc = {
> >  	.num_clients = ARRAY_SIZE(tegra186_mc_clients),
> >  	.clients = tegra186_mc_clients,
> > +	.ops = &tegra186_mc_ops,
> >  };
> >  #endif
> >  
> > @@ -1909,6 +1921,7 @@ static const struct tegra_mc_client tegra194_mc_clients[] = {
> >  static const struct tegra_mc_soc tegra194_mc_soc = {
> >  	.num_clients = ARRAY_SIZE(tegra194_mc_clients),
> >  	.clients = tegra194_mc_clients,
> > +	.ops = &tegra186_mc_ops,
> >  };
> >  #endif
> >  
> > @@ -1961,22 +1974,28 @@ static const struct of_device_id tegra186_mc_of_match[] = {
> >  };
> >  MODULE_DEVICE_TABLE(of, tegra186_mc_of_match);
> >  
> > -static int __maybe_unused tegra186_mc_suspend(struct device *dev)
> > +static int __maybe_unused tegra_mc_suspend(struct device *dev)
> >  {
> > +	struct tegra_mc *mc = dev_get_drvdata(dev);
> > +
> > +	if (mc->soc->ops && mc->soc->ops->suspend)
> > +		return mc->soc->ops->suspend(mc);
> > +
> >  	return 0;
> >  }
> >  
> > -static int __maybe_unused tegra186_mc_resume(struct device *dev)
> > +static int __maybe_unused tegra_mc_resume(struct device *dev)
> >  {
> >  	struct tegra_mc *mc = dev_get_drvdata(dev);
> >  
> > -	tegra186_mc_program_sid(mc);
> > +	if (mc->soc->ops && mc->soc->ops->resume)
> > +		return mc->soc->ops->resume(mc);
> >  
> >  	return 0;
> >  }
> >  
> >  static const struct dev_pm_ops tegra186_mc_pm_ops = {
> > -	SET_SYSTEM_SLEEP_PM_OPS(tegra186_mc_suspend, tegra186_mc_resume)
> > +	SET_SYSTEM_SLEEP_PM_OPS(tegra_mc_suspend, tegra_mc_resume)
> 
> What's the benefit here? You basically define your own suspend-resume
> ops, on top of PM suspend-resume ops... Before it was quite obvious code
> - the Tegra186 MC driver had very simple suspend/resume which did simple
> job. Now it feels like trickier code to follow - Tegra186 driver calls
> it's resume (with the same name as others - another confusion) which is
> a simple wrapper calling somewhere else (need to jump to assinment of
> resume()).

This confusion is merely temporary. The idea here is to make the
Tegra186 driver the same as the "legacy" driver in this regard so that
the unification patch becomes just a removal of this code. If I didn't
first make this the same, I would've had to push this set of changes
into the unification patch, making it more difficult to understand.

Thierry

diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
index b7e104bf6614..2b21131d779c 100644
--- a/drivers/memory/tegra/mc.c
+++ b/drivers/memory/tegra/mc.c
@@ -829,8 +829,8 @@  static int tegra_mc_probe(struct platform_device *pdev)
 
 	mc->debugfs.root = debugfs_create_dir("mc", NULL);
 
-	if (mc->soc->init) {
-		err = mc->soc->init(mc);
+	if (mc->soc->ops && mc->soc->ops->init) {
+		err = mc->soc->ops->init(mc);
 		if (err < 0)
 			dev_err(&pdev->dev, "failed to initialize SoC driver: %d\n",
 				err);
@@ -867,30 +867,22 @@  static int tegra_mc_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int tegra_mc_suspend(struct device *dev)
+static int __maybe_unused tegra_mc_suspend(struct device *dev)
 {
 	struct tegra_mc *mc = dev_get_drvdata(dev);
-	int err;
 
-	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && mc->gart) {
-		err = tegra_gart_suspend(mc->gart);
-		if (err)
-			return err;
-	}
+	if (mc->soc->ops && mc->soc->ops->suspend)
+		return mc->soc->ops->suspend(mc);
 
 	return 0;
 }
 
-static int tegra_mc_resume(struct device *dev)
+static int __maybe_unused tegra_mc_resume(struct device *dev)
 {
 	struct tegra_mc *mc = dev_get_drvdata(dev);
-	int err;
 
-	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && mc->gart) {
-		err = tegra_gart_resume(mc->gart);
-		if (err)
-			return err;
-	}
+	if (mc->soc->ops && mc->soc->ops->resume)
+		return mc->soc->ops->resume(mc);
 
 	return 0;
 }
diff --git a/drivers/memory/tegra/tegra186.c b/drivers/memory/tegra/tegra186.c
index 8e77567d1378..9d3fdb609d55 100644
--- a/drivers/memory/tegra/tegra186.c
+++ b/drivers/memory/tegra/tegra186.c
@@ -45,6 +45,17 @@  static void tegra186_mc_program_sid(struct tegra_mc *mc)
 	}
 }
 
+static int tegra186_mc_resume(struct tegra_mc *mc)
+{
+	tegra186_mc_program_sid(mc);
+
+	return 0;
+}
+
+static const struct tegra_mc_ops tegra186_mc_ops = {
+	.resume = tegra186_mc_resume,
+};
+
 #if defined(CONFIG_ARCH_TEGRA_186_SOC)
 static const struct tegra_mc_client tegra186_mc_clients[] = {
 	{
@@ -701,6 +712,7 @@  static const struct tegra_mc_client tegra186_mc_clients[] = {
 static const struct tegra_mc_soc tegra186_mc_soc = {
 	.num_clients = ARRAY_SIZE(tegra186_mc_clients),
 	.clients = tegra186_mc_clients,
+	.ops = &tegra186_mc_ops,
 };
 #endif
 
@@ -1909,6 +1921,7 @@  static const struct tegra_mc_client tegra194_mc_clients[] = {
 static const struct tegra_mc_soc tegra194_mc_soc = {
 	.num_clients = ARRAY_SIZE(tegra194_mc_clients),
 	.clients = tegra194_mc_clients,
+	.ops = &tegra186_mc_ops,
 };
 #endif
 
@@ -1961,22 +1974,28 @@  static const struct of_device_id tegra186_mc_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, tegra186_mc_of_match);
 
-static int __maybe_unused tegra186_mc_suspend(struct device *dev)
+static int __maybe_unused tegra_mc_suspend(struct device *dev)
 {
+	struct tegra_mc *mc = dev_get_drvdata(dev);
+
+	if (mc->soc->ops && mc->soc->ops->suspend)
+		return mc->soc->ops->suspend(mc);
+
 	return 0;
 }
 
-static int __maybe_unused tegra186_mc_resume(struct device *dev)
+static int __maybe_unused tegra_mc_resume(struct device *dev)
 {
 	struct tegra_mc *mc = dev_get_drvdata(dev);
 
-	tegra186_mc_program_sid(mc);
+	if (mc->soc->ops && mc->soc->ops->resume)
+		return mc->soc->ops->resume(mc);
 
 	return 0;
 }
 
 static const struct dev_pm_ops tegra186_mc_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(tegra186_mc_suspend, tegra186_mc_resume)
+	SET_SYSTEM_SLEEP_PM_OPS(tegra_mc_suspend, tegra_mc_resume)
 };
 
 static struct platform_driver tegra186_mc_driver = {
diff --git a/drivers/memory/tegra/tegra20.c b/drivers/memory/tegra/tegra20.c
index 2db68a913b7a..a3335ad20f4d 100644
--- a/drivers/memory/tegra/tegra20.c
+++ b/drivers/memory/tegra/tegra20.c
@@ -687,6 +687,38 @@  static int tegra20_mc_init(struct tegra_mc *mc)
 	return 0;
 }
 
+static int tegra20_mc_suspend(struct tegra_mc *mc)
+{
+	int err;
+
+	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && mc->gart) {
+		err = tegra_gart_suspend(mc->gart);
+		if (err < 0)
+			return err;
+	}
+
+	return 0;
+}
+
+static int tegra20_mc_resume(struct tegra_mc *mc)
+{
+	int err;
+
+	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_GART) && mc->gart) {
+		err = tegra_gart_resume(mc->gart);
+		if (err < 0)
+			return err;
+	}
+
+	return 0;
+}
+
+static const struct tegra_mc_ops tegra20_mc_ops = {
+	.init = tegra20_mc_init,
+	.suspend = tegra20_mc_suspend,
+	.resume = tegra20_mc_resume,
+};
+
 const struct tegra_mc_soc tegra20_mc_soc = {
 	.clients = tegra20_mc_clients,
 	.num_clients = ARRAY_SIZE(tegra20_mc_clients),
@@ -698,5 +730,5 @@  const struct tegra_mc_soc tegra20_mc_soc = {
 	.resets = tegra20_mc_resets,
 	.num_resets = ARRAY_SIZE(tegra20_mc_resets),
 	.icc_ops = &tegra20_mc_icc_ops,
-	.init = tegra20_mc_init,
+	.ops = &tegra20_mc_ops,
 };
diff --git a/include/soc/tegra/mc.h b/include/soc/tegra/mc.h
index 9da4ef52ce30..7c49f75087c3 100644
--- a/include/soc/tegra/mc.h
+++ b/include/soc/tegra/mc.h
@@ -169,6 +169,12 @@  struct tegra_mc_icc_ops {
 						void *data);
 };
 
+struct tegra_mc_ops {
+	int (*init)(struct tegra_mc *mc);
+	int (*suspend)(struct tegra_mc *mc);
+	int (*resume)(struct tegra_mc *mc);
+};
+
 struct tegra_mc_soc {
 	const struct tegra_mc_client *clients;
 	unsigned int num_clients;
@@ -190,8 +196,7 @@  struct tegra_mc_soc {
 	unsigned int num_resets;
 
 	const struct tegra_mc_icc_ops *icc_ops;
-
-	int (*init)(struct tegra_mc *mc);
+	const struct tegra_mc_ops *ops;
 };
 
 struct tegra_mc {

[03/10] memory: tegra: Push suspend/resume into SoC drivers

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