gpu: ipu-v3: prg: switch to runtime PM

Instead of open-coding the clk enable/disable in all of the callers
move this to the RPM suspend/resume functions.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/gpu/ipu-v3/ipu-prg.c

@@ -20,6 +20,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <video/imx-ipu-v3.h>
 
@@ -139,21 +140,11 @@ EXPORT_SYMBOL_GPL(ipu_prg_format_supported);
 int ipu_prg_enable(struct ipu_soc *ipu)
 {
 	struct ipu_prg *prg = ipu->prg_priv;
-	int ret;
 
 	if (!prg)
 		return 0;
 
-	ret = clk_prepare_enable(prg->clk_axi);
-	if (ret)
-		goto fail_disable_ipg;
-
-	return 0;
-
-fail_disable_ipg:
-	clk_disable_unprepare(prg->clk_ipg);
-
-	return ret;
+	return pm_runtime_get_sync(prg->dev);
 }
 EXPORT_SYMBOL_GPL(ipu_prg_enable);
 
@@ -164,7 +155,7 @@ void ipu_prg_disable(struct ipu_soc *ipu)
 	if (!prg)
 		return;
 
-	clk_disable_unprepare(prg->clk_axi);
+	pm_runtime_put(prg->dev);
 }
 EXPORT_SYMBOL_GPL(ipu_prg_disable);
 
@@ -255,7 +246,7 @@ void ipu_prg_channel_disable(struct ipuv3_channel *ipu_chan)
 	if (!chan->enabled || prg_chan < 0)
 		return;
 
-	clk_prepare_enable(prg->clk_ipg);
+	pm_runtime_get_sync(prg->dev);
 
 	val = readl(prg->regs + IPU_PRG_CTL);
 	val |= IPU_PRG_CTL_BYPASS(prg_chan);
@@ -264,7 +255,7 @@ void ipu_prg_channel_disable(struct ipuv3_channel *ipu_chan)
 	val = IPU_PRG_REG_UPDATE_REG_UPDATE;
 	writel(val, prg->regs + IPU_PRG_REG_UPDATE);
 
-	clk_disable_unprepare(prg->clk_ipg);
+	pm_runtime_put(prg->dev);
 
 	ipu_prg_put_pre(prg, prg_chan);
 
@@ -299,11 +290,7 @@ int ipu_prg_channel_configure(struct ipuv3_channel *ipu_chan,
 			  width, height, stride, format, *eba);
 
 
-	ret = clk_prepare_enable(prg->clk_ipg);
-	if (ret) {
-		ipu_prg_put_pre(prg, prg_chan);
-		return ret;
-	}
+	pm_runtime_get_sync(prg->dev);
 
 	val = (stride - 1) & IPU_PRG_STRIDE_STRIDE_MASK;
 	writel(val, prg->regs + IPU_PRG_STRIDE(prg_chan));
@@ -336,7 +323,7 @@ int ipu_prg_channel_configure(struct ipuv3_channel *ipu_chan,
 			   (val & IPU_PRG_STATUS_BUFFER1_READY(prg_chan)),
 			   5, 1000);
 
-	clk_disable_unprepare(prg->clk_ipg);
+	pm_runtime_put(prg->dev);
 
 	chan->enabled = true;
 	return 0;
@@ -384,6 +371,12 @@ static int ipu_prg_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	ret = clk_prepare_enable(prg->clk_axi);
+	if (ret) {
+		clk_disable_unprepare(prg->clk_ipg);
+		return ret;
+	}
+
 	/* init to free running mode */
 	val = readl(prg->regs + IPU_PRG_CTL);
 	val |= IPU_PRG_CTL_SHADOW_EN;
@@ -392,7 +385,8 @@ static int ipu_prg_probe(struct platform_device *pdev)
 	/* disable address threshold */
 	writel(0xffffffff, prg->regs + IPU_PRG_THD);
 
-	clk_disable_unprepare(prg->clk_ipg);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
 
 	prg->dev = dev;
 	platform_set_drvdata(pdev, prg);
@@ -414,6 +408,40 @@ static int ipu_prg_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_PM
+static int prg_suspend(struct device *dev)
+{
+	struct ipu_prg *prg = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(prg->clk_axi);
+	clk_disable_unprepare(prg->clk_ipg);
+
+	return 0;
+}
+
+static int prg_resume(struct device *dev)
+{
+	struct ipu_prg *prg = dev_get_drvdata(dev);
+	int ret;
+
+	ret = clk_prepare_enable(prg->clk_ipg);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(prg->clk_axi);
+	if (ret) {
+		clk_disable_unprepare(prg->clk_ipg);
+		return ret;
+	}
+
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops prg_pm_ops = {
+	SET_RUNTIME_PM_OPS(prg_suspend, prg_resume, NULL)
+};
+
 static const struct of_device_id ipu_prg_dt_ids[] = {
 	{ .compatible = "fsl,imx6qp-prg", },
 	{ /* sentinel */ },
@@ -424,6 +452,7 @@ struct platform_driver ipu_prg_drv = {
 	.remove		= ipu_prg_remove,
 	.driver		= {
 		.name	= "imx-ipu-prg",
+		.pm	= &prg_pm_ops,
 		.of_match_table = ipu_prg_dt_ids,
 	},
 };