Linux Kernels

usb: dwc3: exynos: add basic suspend/resume support

This change “usb: dwc3: exynos: add basic suspend/resume support” (commit 0646caf) in Linux kernel is authored by Vikas Sajjan <vikas.sajjan [at] linaro.org> on Tue Oct 16 15:15:38 2012 +0530.

Description of "usb: dwc3: exynos: add basic suspend/resume support"

The change “usb: dwc3: exynos: add basic suspend/resume support” introduces changes as follows.

usb: dwc3: exynos: add basic suspend/resume support

Adds suspend and resume callbacks to exynos dwc3 driver as part of
power management support.

This change does gating of dwc3 clock during suspend/resume cycles.

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Vikas C Sajjan <vikas.sajjan@linaro.org>
CC: Doug Anderson <dianders@chromium.org>
Tested-by: Vivek Gautam <gautam.vivek@samsung.com>

[ balbi@ti.com : refreshed to current linus/master ]

Signed-off-by: Felipe Balbi <balbi@ti.com>

Linux kernel releases containing commit 0646caf

The Linux kernel releases containing this commit are as follows.

Linux kernel code changes from "usb: dwc3: exynos: add basic suspend/resume support"

There are 34 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 drivers/usb/dwc3/dwc3-exynos.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 
diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
index b082bec7343e..e12e45248862 100644
--- a/drivers/usb/dwc3/dwc3-exynos.c
+++ b/drivers/usb/dwc3/dwc3-exynos.c
@@ -187,12 +187,46 @@ static const struct of_device_id exynos_dwc3_match[] = {
 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
 #endif
 
+#ifdef CONFIG_PM
+static int dwc3_exynos_suspend(struct device *dev)
+{
+	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
+
+	clk_disable(exynos->clk);
+
+	return 0;
+}
+
+static int dwc3_exynos_resume(struct device *dev)
+{
+	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
+
+	clk_enable(exynos->clk);
+
+	/* runtime set active to reflect active state. */
+	pm_runtime_disable(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
+	return 0;
+}
+
+static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
+};
+
+#define DEV_PM_OPS	(&dwc3_exynos_dev_pm_ops)
+#else
+#define DEV_PM_OPS	NULL
+#endif /* CONFIG_PM */
+
 static struct platform_driver dwc3_exynos_driver = {
 	.probe		= dwc3_exynos_probe,
 	.remove		= dwc3_exynos_remove,
 	.driver		= {
 		.name	= "exynos-dwc3",
 		.of_match_table = of_match_ptr(exynos_dwc3_match),
+		.pm	= DEV_PM_OPS,
 	},
 };
 

The commit for this change in Linux stable tree is 0646caf (patch).

Last modified: 2020/01/11 09:26