linux-kernel - [PATCH] intel_mid_dma: fix runtime pm issues

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Date:	Thu, 31 Mar 2011 11:02:43 -0700
From:	kristen@...ux.intel.com
To:	vinod.koul@...el.com
Cc:	linux-kernel@...r.kernel.org, alan@...ux.intel.com,
	Kristen Carlson Accardi <kristen@...ux.intel.com>
Subject: [PATCH] intel_mid_dma: fix runtime pm issues

From: Kristen Carlson Accardi <kristen@...ux.intel.com>

Use the correct api in probe to enable runtime pm for this driver.
Additionally, do not just call legacy suspend for runtime_suspend,
as this duplicates some work the pci core does for you.

Signed-off-by: Kristen Carlson Accardi <kristen@...ux.intel.com>
---
 drivers/dma/intel_mid_dma.c |   17 +++++++++++++----
 1 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/intel_mid_dma.c b/drivers/dma/intel_mid_dma.c
index 798f46a..f153adf 100644
--- a/drivers/dma/intel_mid_dma.c
+++ b/drivers/dma/intel_mid_dma.c
@@ -1292,8 +1292,7 @@ static int __devinit intel_mid_dma_probe(struct pci_dev *pdev,
 	if (err)
 		goto err_dma;
 
-	pm_runtime_set_active(&pdev->dev);
-	pm_runtime_enable(&pdev->dev);
+	pm_runtime_put_noidle(&pdev->dev);
 	pm_runtime_allow(&pdev->dev);
 	return 0;
 
@@ -1322,6 +1321,9 @@ err_enable_device:
 static void __devexit intel_mid_dma_remove(struct pci_dev *pdev)
 {
 	struct middma_device *device = pci_get_drvdata(pdev);
+
+	pm_runtime_get_noresume(&pdev->dev);
+	pm_runtime_forbid(&pdev->dev);
 	middma_shutdown(pdev);
 	pci_dev_put(pdev);
 	kfree(device);
@@ -1385,13 +1387,20 @@ int dma_resume(struct pci_dev *pci)
 static int dma_runtime_suspend(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	return dma_suspend(pci_dev, PMSG_SUSPEND);
+	struct middma_device *device = pci_get_drvdata(pci_dev);
+
+	device->state = SUSPENDED;
+	return 0;
 }
 
 static int dma_runtime_resume(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
-	return dma_resume(pci_dev);
+	struct middma_device *device = pci_get_drvdata(pci_dev);
+
+	device->state = RUNNING;
+	iowrite32(REG_BIT0, device->dma_base + DMA_CFG);
+	return 0;
 }
 
 static int dma_runtime_idle(struct device *dev)
-- 
1.7.3.1

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