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From: Sai Prakash Ranjan <>
To: Will Deacon <>,
	Robin Murphy <>,
	Joerg Roedel <>,
	Rajendra Nayak <>,
	Taniya Das <>, srimuc <>
	Sai Prakash Ranjan <>
Subject: [PATCH] iommu/arm-smmu: Add clk_bulk_{prepare/unprepare} to system pm callbacks
Date: Tue, 27 Jul 2021 15:03:22 +0530	[thread overview]
Message-ID: <> (raw)

Some clocks for SMMU can have parent as XO such as gpu_cc_hub_cx_int_clk
of GPU SMMU in QTI SC7280 SoC and in order to enter deep sleep states in
such cases, we would need to drop the XO clock vote in unprepare call and
this unprepare callback for XO is in RPMh (Resource Power Manager-Hardened)
clock driver which controls RPMh managed clock resources for new QTI SoCs
and is a blocking call.

Given we cannot have a sleeping calls such as clk_bulk_prepare() and
clk_bulk_unprepare() in arm-smmu runtime pm callbacks since the iommu
operations like map and unmap can be in atomic context and are in fast
path, add this prepare and unprepare call to drop the XO vote only for
system pm callbacks since it is not a fast path and we expect the system
to enter deep sleep states with system pm as opposed to runtime pm.

This is a similar sequence of clock requests (prepare,enable and
disable,unprepare) in arm-smmu probe and remove.

Signed-off-by: Sai Prakash Ranjan <>
Co-developed-by: Rajendra Nayak <>
Signed-off-by: Rajendra Nayak <>
 drivers/iommu/arm/arm-smmu/arm-smmu.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index d3c6f54110a5..9561ba4c5d39 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -2277,6 +2277,13 @@ static int __maybe_unused arm_smmu_runtime_suspend(struct device *dev)
 static int __maybe_unused arm_smmu_pm_resume(struct device *dev)
+	int ret;
+	struct arm_smmu_device *smmu = dev_get_drvdata(dev);
+	ret = clk_bulk_prepare(smmu->num_clks, smmu->clks);
+	if (ret)
+		return ret;
 	if (pm_runtime_suspended(dev))
 		return 0;
@@ -2285,10 +2292,19 @@ static int __maybe_unused arm_smmu_pm_resume(struct device *dev)
 static int __maybe_unused arm_smmu_pm_suspend(struct device *dev)
+	int ret = 0;
+	struct arm_smmu_device *smmu = dev_get_drvdata(dev);
 	if (pm_runtime_suspended(dev))
-		return 0;
+		goto clk_unprepare;
-	return arm_smmu_runtime_suspend(dev);
+	ret = arm_smmu_runtime_suspend(dev);
+	if (ret)
+		return ret;
+	clk_bulk_unprepare(smmu->num_clks, smmu->clks);
+	return ret;
 static const struct dev_pm_ops arm_smmu_pm_ops = {
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation

             reply	other threads:[~2021-07-27  9:34 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-27  9:33 Sai Prakash Ranjan [this message]
2021-07-27 10:25 ` Robin Murphy
2021-07-27 10:33   ` Robin Murphy
2021-07-27 10:35     ` Sai Prakash Ranjan
2021-08-02 16:12 ` Will Deacon
2021-08-03  1:14   ` Rob Clark
2021-08-03  6:06   ` Sai Prakash Ranjan
2021-08-10  6:51     ` Sai Prakash Ranjan

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