Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 6254b64f authored by Yong Wu's avatar Yong Wu Committed by Joerg Roedel
Browse files

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: default avatarHonghui Zhang <honghui.zhang@mediatek.com>
Signed-off-by: default avatarYong Wu <yong.wu@mediatek.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 4b00f5ac

drivers/iommu/mtk_iommu.c

+8 −1
Original line number Diff line number Diff line
@@ -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[] = {