From 6254b64f570622d4ebb7af00d46229bfc7346212 Mon Sep 17 00:00:00 2001 From: Yong Wu Date: Mon, 21 Aug 2017 19:00:19 +0800 Subject: iommu/mediatek: Disable iommu clock when system suspend 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 Signed-off-by: Yong Wu Signed-off-by: Joerg Roedel --- drivers/iommu/mtk_iommu.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'drivers/iommu') diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index a82196c0c5df..e21de8634cba 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; } @@ -683,7 +684,13 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev) struct mtk_iommu_data *data = dev_get_drvdata(dev); struct mtk_iommu_suspend_reg *reg = &data->reg; void __iomem *base = data->base; + int ret; + ret = clk_prepare_enable(data->bclk); + if (ret) { + dev_err(data->dev, "Failed to enable clk(%d) in resume\n", ret); + return ret; + } writel_relaxed(reg->standard_axi_mode, base + REG_MMU_STANDARD_AXI_MODE); writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM_DIS); @@ -699,7 +706,7 @@ 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[] = { -- cgit v1.2.3