[PATCH 5/8] iommu/mediatek: Disable iommu clock when system suspend

Yong Wu yong.wu at mediatek.com
Fri Aug 11 02:56:14 PDT 2017


When system suspend, infra power domain may be off, and the iommu's
clock must be disabled when system off, or the iommu's bclk clock maybe
disabled after system resume.

Signed-off-by: Honghui Zhang <honghui.zhang at mediatek.com>
Signed-off-by: Yong Wu <yong.wu at mediatek.com>
---
 drivers/iommu/mtk_iommu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index e81ed9a..b7c8e52 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -675,6 +675,7 @@ static int __maybe_unused mtk_iommu_suspend(struct device *dev)
 	reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG);
 	reg->int_control0 = readl_relaxed(base + REG_MMU_INT_CONTROL0);
 	reg->int_main_control = readl_relaxed(base + REG_MMU_INT_MAIN_CONTROL);
+	clk_disable_unprepare(data->bclk);
 	return 0;
 }
 
@@ -684,6 +685,7 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
 	struct mtk_iommu_suspend_reg *reg = &data->reg;
 	void __iomem *base = data->base;
 
+	clk_prepare_enable(data->bclk);
 	writel_relaxed(reg->standard_axi_mode,
 		       base + REG_MMU_STANDARD_AXI_MODE);
 	writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM_DIS);
@@ -699,7 +701,7 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
 }
 
 static const struct dev_pm_ops mtk_iommu_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(mtk_iommu_suspend, mtk_iommu_resume)
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_iommu_suspend, mtk_iommu_resume)
 };
 
 static const struct of_device_id mtk_iommu_of_ids[] = {
-- 
1.9.1




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