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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200930070647.10188-15-yong.wu@mediatek.com>
Date:   Wed, 30 Sep 2020 15:06:37 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Will Deacon <will@...nel.org>
CC:     Evan Green <evgreen@...omium.org>, Tomasz Figa <tfiga@...gle.com>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <yong.wu@...iatek.com>,
        <youlin.pei@...iatek.com>, Nicolas Boichat <drinkcat@...omium.org>,
        <anan.sun@...iatek.com>, <chao.hao@...iatek.com>,
        <ming-fan.chen@...iatek.com>,
        Greg Kroah-Hartman <gregkh@...gle.com>,
        <kernel-team@...roid.com>
Subject: [PATCH v3 14/24] iommu/mediatek: Add pm runtime callback

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@...iatek.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