From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yong Wu Subject: [PATCH 5/8] iommu/mediatek: Disable iommu clock when system suspend Date: Fri, 11 Aug 2017 17:56:14 +0800 Message-ID: <1502445377-26936-6-git-send-email-yong.wu@mediatek.com> References: <1502445377-26936-1-git-send-email-yong.wu@mediatek.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1502445377-26936-1-git-send-email-yong.wu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Joerg Roedel , Rob Herring , Matthias Brugger , Robin Murphy Cc: Mark Rutland , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Arvind Yadav , arnd-r2nGTMty4D4@public.gmane.org, srv_heupstream-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org, Catalin Marinas , youlin.pei-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org, Will Deacon , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Tomasz Figa , iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Daniel Kurtz , cloud.chou-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org, linux-mediatek-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, k.zhang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: devicetree@vger.kernel.org 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); 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