linux-kernel - [PATCH 1/3] dmaengine: sprd: support dma device suspend/resume

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Date:   Wed, 25 Oct 2023 20:05:00 +0800
From:   Kaiwei Liu <kaiwei.liu@...soc.com>
To:     Vinod Koul <vkoul@...nel.org>, Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>
CC:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        kaiwei liu <liukaiwei086@...il.com>,
        Wenming Wu <wenming.wu@...soc.com>
Subject: [PATCH 1/3] dmaengine: sprd: support dma device suspend/resume

From: "kaiwei.liu" <kaiwei.liu@...soc.com>

The DMA doesn't support device suspend/resume before, now
some modules using DMA have add device suspend/resume which
may invalidate the DMA runtime suspend/reusume mechanism and
result in abnormal DMA suspend/resume. So here add relative
interface for DMA device suspend/resume.

Signed-off-by: kaiwei.liu <kaiwei.liu@...soc.com>
---
 drivers/dma/sprd-dma.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index 08fcf1ec368c..0fa950dfa4f0 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -1291,10 +1291,30 @@ static int __maybe_unused sprd_dma_runtime_resume(struct device *dev)
 	return ret;
 }
 
+static int sprd_dma_suspend_noirq(struct device *dev)
+{
+	if ((pm_runtime_status_suspended(dev)) ||
+	    (atomic_read(&(dev->power.usage_count)) > 1))
+		return 0;
+
+	return sprd_dma_runtime_suspend(dev);
+}
+
+static int sprd_dma_resume_early(struct device *dev)
+{
+	if ((pm_runtime_status_suspended(dev)) ||
+	    (atomic_read(&(dev->power.usage_count)) > 1))
+		return 0;
+
+	return sprd_dma_runtime_resume(dev);
+}
+
 static const struct dev_pm_ops sprd_dma_pm_ops = {
 	SET_RUNTIME_PM_OPS(sprd_dma_runtime_suspend,
 			   sprd_dma_runtime_resume,
 			   NULL)
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sprd_dma_suspend_noirq,
+				      sprd_dma_resume_early)
 };
 
 static struct platform_driver sprd_dma_driver = {
-- 
2.17.1