linux-kernel - [PATCH 1/2] dmaengine: dw-axi-dmac: simplify PM functions and use modern macros

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Message-ID: <20251012100002.2959213-2-a.shimko.dev@gmail.com>
Date: Sun, 12 Oct 2025 12:59:59 +0300
From: Artem Shimko <a.shimko.dev@...il.com>
To: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
	Vinod Koul <vkoul@...nel.org>
Cc: a.shimko.dev@...il.com,
	dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] dmaengine: dw-axi-dmac: simplify PM functions and use modern macros

Simplify the power management code by removing redundant wrapper functions
and using modern kernel PM macros. This reduces code duplication and
improves maintainability.

The changes convert the suspend/resume functions to take device pointer
directly instead of the chip structure, allowing removal of the runtime
PM wrapper functions. The manual PM ops definition is replaced with
DEFINE_RUNTIME_DEV_PM_OPS() macro and pm_ptr(). Probe and remove
functions are updated to call PM functions with device pointer.

Signed-off-by: Artem Shimko <a.shimko.dev@...il.com>
---
 .../dma/dw-axi-dmac/dw-axi-dmac-platform.c    | 31 ++++++-------------
 1 file changed, 9 insertions(+), 22 deletions(-)

diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
index b23536645ff7..8b7cf3baf5d3 100644
--- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
+++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
@@ -1314,8 +1314,10 @@ static int dma_chan_resume(struct dma_chan *dchan)
 	return 0;
 }
 
-static int axi_dma_suspend(struct axi_dma_chip *chip)
+static int axi_dma_suspend(struct device *dev)
 {
+	struct axi_dma_chip *chip = dev_get_drvdata(dev);
+
 	axi_dma_irq_disable(chip);
 	axi_dma_disable(chip);
 
@@ -1325,9 +1327,10 @@ static int axi_dma_suspend(struct axi_dma_chip *chip)
 	return 0;
 }
 
-static int axi_dma_resume(struct axi_dma_chip *chip)
+static int axi_dma_resume(struct device *dev)
 {
 	int ret;
+	struct axi_dma_chip *chip = dev_get_drvdata(dev);
 
 	ret = clk_prepare_enable(chip->cfgr_clk);
 	if (ret < 0)
@@ -1343,20 +1346,6 @@ static int axi_dma_resume(struct axi_dma_chip *chip)
 	return 0;
 }
 
-static int __maybe_unused axi_dma_runtime_suspend(struct device *dev)
-{
-	struct axi_dma_chip *chip = dev_get_drvdata(dev);
-
-	return axi_dma_suspend(chip);
-}
-
-static int __maybe_unused axi_dma_runtime_resume(struct device *dev)
-{
-	struct axi_dma_chip *chip = dev_get_drvdata(dev);
-
-	return axi_dma_resume(chip);
-}
-
 static struct dma_chan *dw_axi_dma_of_xlate(struct of_phandle_args *dma_spec,
 					    struct of_dma *ofdma)
 {
@@ -1590,7 +1579,7 @@ static int dw_probe(struct platform_device *pdev)
 	 * driver to work also without Runtime PM.
 	 */
 	pm_runtime_get_noresume(chip->dev);
-	ret = axi_dma_resume(chip);
+	ret = axi_dma_resume(chip->dev);
 	if (ret < 0)
 		goto err_pm_disable;
 
@@ -1638,7 +1627,7 @@ static void dw_remove(struct platform_device *pdev)
 	axi_dma_disable(chip);
 
 	pm_runtime_disable(chip->dev);
-	axi_dma_suspend(chip);
+	axi_dma_suspend(chip->dev);
 
 	for (i = 0; i < DMAC_MAX_CHANNELS; i++)
 		if (chip->irq[i] > 0)
@@ -1653,9 +1642,7 @@ static void dw_remove(struct platform_device *pdev)
 	}
 }
 
-static const struct dev_pm_ops dw_axi_dma_pm_ops = {
-	SET_RUNTIME_PM_OPS(axi_dma_runtime_suspend, axi_dma_runtime_resume, NULL)
-};
+static DEFINE_RUNTIME_DEV_PM_OPS(dw_axi_dma_pm_ops, axi_dma_suspend, axi_dma_resume, NULL);
 
 static const struct of_device_id dw_dma_of_id_table[] = {
 	{
@@ -1680,7 +1667,7 @@ static struct platform_driver dw_driver = {
 	.driver = {
 		.name	= KBUILD_MODNAME,
 		.of_match_table = dw_dma_of_id_table,
-		.pm = &dw_axi_dma_pm_ops,
+		.pm = pm_ptr(&dw_axi_dma_pm_ops),
 	},
 };
 module_platform_driver(dw_driver);
-- 
2.43.0