usb: chipidea: imx: add runtime power management support

Add runtime pm support for imx, only imx6 series are supported and tested.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 100 insertions, 6 deletions

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index 353989e5675b..5ad85fe84411 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -25,6 +25,7 @@
 
 struct ci_hdrc_imx_platform_flag {
         unsigned int flags;
+        bool runtime_pm;
 };
 
 static const struct ci_hdrc_imx_platform_flag imx27_usb_data = {
@@ -34,9 +35,24 @@ static const struct ci_hdrc_imx_platform_flag imx28_usb_data = {
         .flags = CI_HDRC_IMX28_WRITE_FIX,
 };
 
+static const struct ci_hdrc_imx_platform_flag imx6q_usb_data = {
+        .flags = CI_HDRC_SUPPORTS_RUNTIME_PM,
+};
+
+static const struct ci_hdrc_imx_platform_flag imx6sl_usb_data = {
+        .flags = CI_HDRC_SUPPORTS_RUNTIME_PM,
+};
+
+static const struct ci_hdrc_imx_platform_flag imx6sx_usb_data = {
+        .flags = CI_HDRC_SUPPORTS_RUNTIME_PM,
+};
+
 static const struct of_device_id ci_hdrc_imx_dt_ids[] = {
         { .compatible = "fsl,imx28-usb", .data = &imx28_usb_data},
         { .compatible = "fsl,imx27-usb", .data = &imx27_usb_data},
+        { .compatible = "fsl,imx6q-usb", .data = &imx6q_usb_data},
+        { .compatible = "fsl,imx6sl-usb", .data = &imx6sl_usb_data},
+        { .compatible = "fsl,imx6sx-usb", .data = &imx6sl_usb_data},
         { /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, ci_hdrc_imx_dt_ids);
@@ -46,6 +62,8 @@ struct ci_hdrc_imx_data {
         struct platform_device *ci_pdev;
         struct clk *clk;
         struct imx_usbmisc_data *usbmisc_data;
+        bool supports_runtime_pm;
+        bool in_lpm;
 };
 
 /* Common functions shared by usbmisc drivers */
@@ -144,6 +162,8 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
 
         pdata.usb_phy = data->phy;
         pdata.flags |= imx_platform_flag->flags;
+        if (pdata.flags & CI_HDRC_SUPPORTS_RUNTIME_PM)
+                data->supports_runtime_pm = true;
 
         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
         if (ret)
@@ -174,8 +194,10 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
 
         platform_set_drvdata(pdev, data);
 
-        pm_runtime_no_callbacks(&pdev->dev);
-        pm_runtime_enable(&pdev->dev);
+        if (data->supports_runtime_pm) {
+                pm_runtime_set_active(&pdev->dev);
+                pm_runtime_enable(&pdev->dev);
+        }
 
         return 0;
 
@@ -190,14 +212,18 @@ static int ci_hdrc_imx_remove(struct platform_device *pdev)
 {
         struct ci_hdrc_imx_data *data = platform_get_drvdata(pdev);
 
-        pm_runtime_disable(&pdev->dev);
+        if (data->supports_runtime_pm) {
+                pm_runtime_get_sync(&pdev->dev);
+                pm_runtime_disable(&pdev->dev);
+                pm_runtime_put_noidle(&pdev->dev);
+        }
         ci_hdrc_remove_device(data->ci_pdev);
         clk_disable_unprepare(data->clk);
 
         return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_PM
 static int imx_controller_suspend(struct device *dev)
 {
         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
@@ -205,6 +231,7 @@ static int imx_controller_suspend(struct device *dev)
         dev_dbg(dev, "at %s\n", __func__);
 
         clk_disable_unprepare(data->clk);
+        data->in_lpm = true;
 
         return 0;
 }
@@ -212,25 +239,92 @@ static int imx_controller_suspend(struct device *dev)
 static int imx_controller_resume(struct device *dev)
 {
         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
+        int ret = 0;
 
         dev_dbg(dev, "at %s\n", __func__);
 
-        return clk_prepare_enable(data->clk);
+        if (!data->in_lpm) {
+                WARN_ON(1);
+                return 0;
+        }
+
+        ret = clk_prepare_enable(data->clk);
+        if (ret)
+                return ret;
+
+        data->in_lpm = false;
+
+        ret = imx_usbmisc_set_wakeup(data->usbmisc_data, false);
+        if (ret) {
+                dev_err(dev, "usbmisc set_wakeup failed, ret=%d\n", ret);
+                goto clk_disable;
+        }
+
+        return 0;
+
+clk_disable:
+        clk_disable_unprepare(data->clk);
+        return ret;
 }
 
+#ifdef CONFIG_PM_SLEEP
 static int ci_hdrc_imx_suspend(struct device *dev)
 {
+        struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
+
+        if (data->in_lpm)
+                /* The core's suspend doesn't run */
+                return 0;
+
         return imx_controller_suspend(dev);
 }
 
 static int ci_hdrc_imx_resume(struct device *dev)
 {
-        return imx_controller_resume(dev);
+        struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
+        int ret;
+
+        ret = imx_controller_resume(dev);
+        if (!ret && data->supports_runtime_pm) {
+                pm_runtime_disable(dev);
+                pm_runtime_set_active(dev);
+                pm_runtime_enable(dev);
+        }
+
+        return ret;
 }
 #endif /* CONFIG_PM_SLEEP */
 
+static int ci_hdrc_imx_runtime_suspend(struct device *dev)
+{
+        struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
+        int ret;
+
+        if (data->in_lpm) {
+                WARN_ON(1);
+                return 0;
+        }
+
+        ret = imx_usbmisc_set_wakeup(data->usbmisc_data, true);
+        if (ret) {
+                dev_err(dev, "usbmisc set_wakeup failed, ret=%d\n", ret);
+                return ret;
+        }
+
+        return imx_controller_suspend(dev);
+}
+
+static int ci_hdrc_imx_runtime_resume(struct device *dev)
+{
+        return imx_controller_resume(dev);
+}
+
+#endif /* CONFIG_PM */
+
 static const struct dev_pm_ops ci_hdrc_imx_pm_ops = {
         SET_SYSTEM_SLEEP_PM_OPS(ci_hdrc_imx_suspend, ci_hdrc_imx_resume)
+        SET_RUNTIME_PM_OPS(ci_hdrc_imx_runtime_suspend,
+                        ci_hdrc_imx_runtime_resume, NULL)
 };
 static struct platform_driver ci_hdrc_imx_driver = {
         .probe = ci_hdrc_imx_probe,