From mboxrd@z Thu Jan 1 00:00:00 1970 From: yong.wu@mediatek.com (Yong Wu) Date: Sat, 12 Aug 2017 17:34:32 +0800 Subject: [PATCH 5/8] iommu/mediatek: Disable iommu clock when system suspend In-Reply-To: References: <1502445377-26936-1-git-send-email-yong.wu@mediatek.com> <1502445377-26936-6-git-send-email-yong.wu@mediatek.com> Message-ID: <1502530472.11148.54.camel@mhfsdcap03> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Fri, 2017-08-11 at 16:39 +0530, Arvind Yadav wrote: > Hi Youn, > > > On Friday 11 August 2017 03:26 PM, Yong Wu wrote: > > 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 > > --- > > 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); > Please handle return value of clk_prepare_enable. It can fail Thanks for the reminding. I will add it in next version. > > 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[] = { > ~arvind