MLK-16695-2: mipi_csi: Add pm suspend and resume support

Add power manager suspend and resume support for ISI

Reviewed-by: Sandor Yu <sandor.yu@nxp.com>
Signed-off-by: Guoniu.Zhou <guoniu.zhou@nxp.com>

drivers/media/platform/imx8/mxc-isi-core.c

@@ -174,6 +174,8 @@ static int mxc_isi_probe(struct platform_device *pdev)
 		goto err_sclk;
 	}
 
+	mxc_isi->flags = MXC_ISI_PM_POWERED;
+
 	dev_dbg(dev, "mxc_isi.%d registered successfully\n", mxc_isi->id);
 
 	return 0;
@@ -194,6 +196,39 @@ static int mxc_isi_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static int mxc_isi_pm_suspend(struct device *dev)
+{
+	struct mxc_isi_dev *mxc_isi = dev_get_drvdata(dev);
+
+	if (mxc_isi->flags & MXC_ISI_PM_SUSPENDED)
+		return 0;
+
+	clk_disable_unprepare(mxc_isi->clk);
+	mxc_isi->flags |= MXC_ISI_PM_SUSPENDED;
+	mxc_isi->flags &= ~MXC_ISI_PM_POWERED;
+
+	return 0;
+}
+
+static int mxc_isi_pm_resume(struct device *dev)
+{
+	struct mxc_isi_dev *mxc_isi = dev_get_drvdata(dev);
+	int ret;
+
+	if (mxc_isi->flags & MXC_ISI_PM_POWERED)
+		return 0;
+
+	mxc_isi->flags |= MXC_ISI_PM_POWERED;
+	mxc_isi->flags &= ~MXC_ISI_PM_SUSPENDED;
+
+	ret = clk_prepare_enable(mxc_isi->clk);
+	return (ret) ? -EAGAIN : 0;
+}
+
+static const struct dev_pm_ops mxc_isi_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(mxc_isi_pm_suspend, mxc_isi_pm_resume)
+};
+
 static const struct of_device_id mxc_isi_of_match[] = {
 	{.compatible = "fsl,imx8-isi",},
 	{ /* sentinel */ },
@@ -206,6 +241,7 @@ static struct platform_driver mxc_isi_driver = {
 	.driver = {
 		.of_match_table = mxc_isi_of_match,
 		.name		= MXC_ISI_DRIVER_NAME,
+		.pm		= &mxc_isi_pm_ops,
 	}
 };
 

drivers/media/platform/imx8/mxc-isi-core.h

@@ -153,6 +153,11 @@ enum mxc_isi_m2m_in_fmt {
 	MXC_ISI_M2M_IN_FMT_YUV422_1P10P,
 };
 
+enum mxc_isi_power_state {
+	MXC_ISI_PM_SUSPENDED = 0x01,
+	MXC_ISI_PM_POWERED = 0x02,
+};
+
 struct mxc_isi_fmt {
 	char	*name;
 	u32 mbus_code;
@@ -268,6 +273,7 @@ struct mxc_isi_dev {
 	struct clk		*clk;
 
 	u32 interface[MAX_PORTS];
+	u32 flags;
 
 	/* scale factor */
 	u32	xfactor;