[PATCH v3 14/24] iommu/mediatek: Add pm runtime callback

From: Yong Wu <yong.wu@mediatek.com>
To: Joerg Roedel <joro@8bytes.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	 Rob Herring <robh+dt@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Will Deacon <will@kernel.org>
Cc: youlin.pei@mediatek.com, devicetree@vger.kernel.org,
	Nicolas Boichat <drinkcat@chromium.org>,
	srv_heupstream@mediatek.com, chao.hao@mediatek.com,
	kernel-team@android.com, linux-kernel@vger.kernel.org,
	Evan Green <evgreen@chromium.org>, Tomasz Figa <tfiga@google.com>,
	iommu@lists.linux-foundation.org,
	linux-mediatek@lists.infradead.org, yong.wu@mediatek.com,
	ming-fan.chen@mediatek.com, anan.sun@mediatek.com,
	Greg Kroah-Hartman <gregkh@google.com>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 14/24] iommu/mediatek: Add pm runtime callback
Date: Wed, 30 Sep 2020 15:06:37 +0800	[thread overview]
Message-ID: <20200930070647.10188-15-yong.wu@mediatek.com> (raw)
In-Reply-To: <20200930070647.10188-1-yong.wu@mediatek.com>

This patch adds pm runtime callback.

In pm runtime case, all the registers backup/restore and bclk are
controlled in the pm_runtime callback, then pm_suspend is not needed in
this case.

runtime PM is disabled when suspend, thus we call
pm_runtime_status_suspended instead of pm_runtime_suspended.

And, m4u doesn't have its special pm runtime domain in previous SoC, in
this case dev->power.runtime_status is RPM_SUSPENDED defaultly, thus add
a "dev->pm_domain" checking for the SoC that has pm runtime domain.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
 drivers/iommu/mtk_iommu.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 5625458b21ba..052eb72acf69 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -770,7 +770,7 @@ static int mtk_iommu_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static int __maybe_unused mtk_iommu_suspend(struct device *dev)
+static int __maybe_unused mtk_iommu_runtime_suspend(struct device *dev)
 {
 	struct mtk_iommu_data *data = dev_get_drvdata(dev);
 	struct mtk_iommu_suspend_reg *reg = &data->reg;
@@ -788,7 +788,7 @@ static int __maybe_unused mtk_iommu_suspend(struct device *dev)
 	return 0;
 }
 
-static int __maybe_unused mtk_iommu_resume(struct device *dev)
+static int __maybe_unused mtk_iommu_runtime_resume(struct device *dev)
 {
 	struct mtk_iommu_data *data = dev_get_drvdata(dev);
 	struct mtk_iommu_suspend_reg *reg = &data->reg;
@@ -815,7 +815,25 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
 	return 0;
 }
 
+static int __maybe_unused mtk_iommu_suspend(struct device *dev)
+{
+	/* runtime PM is disabled when suspend in pm_runtime case. */
+	if (dev->pm_domain && pm_runtime_status_suspended(dev))
+		return 0;
+
+	return mtk_iommu_runtime_suspend(dev);
+}
+
+static int __maybe_unused mtk_iommu_resume(struct device *dev)
+{
+	if (dev->pm_domain && pm_runtime_status_suspended(dev))
+		return 0;
+
+	return mtk_iommu_runtime_resume(dev);
+}
+
 static const struct dev_pm_ops mtk_iommu_pm_ops = {
+	SET_RUNTIME_PM_OPS(mtk_iommu_runtime_suspend, mtk_iommu_runtime_resume, NULL)
 	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_iommu_suspend, mtk_iommu_resume)
 };
 
-- 
2.18.0
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