During the system suspend/resume procedure, the USB also
needs to go suspend/resume procedure, this patch adds
related APIs. It is tested at i.mx6q sabrelite. Meanwhile,
it fixes the bug that the USB will out of work after
system suspend/resume.
Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
---
drivers/usb/chipidea/bits.h | 1 +
drivers/usb/chipidea/ci13xxx_imx.c | 61 ++++++++++++++++++++++++++++++++++++
2 files changed, 62 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
index ba9c6ef..d1467bb 100644
--- a/drivers/usb/chipidea/bits.h
+++ b/drivers/usb/chipidea/bits.h
@@ -47,6 +47,7 @@
#define PORTSC_FPR BIT(6)
#define PORTSC_SUSP BIT(7)
#define PORTSC_HSP BIT(9)
+#define PORTSC_PHCD BIT(23) /* phy suspend mode */
#define PORTSC_PTC (0x0FUL << 16)
/* DEVLC */
diff --git a/drivers/usb/chipidea/ci13xxx_imx.c b/drivers/usb/chipidea/ci13xxx_imx.c
index 342eab0..dd257b1 100644
--- a/drivers/usb/chipidea/ci13xxx_imx.c
+++ b/drivers/usb/chipidea/ci13xxx_imx.c
@@ -25,6 +25,7 @@
#include <linux/mfd/syscon.h>
#include "ci.h"
+#include "bits.h"
#include "ci13xxx_imx.h"
#define pdev_to_phy(pdev) \
@@ -321,6 +322,63 @@ static int ci13xxx_imx_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM
+static int ci13xxx_imx_suspend(struct device *dev)
+{
+ struct ci13xxx_imx_data *data =
+ platform_get_drvdata(to_platform_device(dev));
+ struct platform_device *plat_ci;
+ struct ci13xxx *ci;
+
+ plat_ci = data->ci_pdev;
+ ci = platform_get_drvdata(plat_ci);
+
+ hw_write(ci, OP_PORTSC, PORTSC_PHCD, 1);
+
+ if (data->phy)
+ usb_phy_set_suspend(data->phy, 1);
+
+ clk_disable_unprepare(data->clk);
+
+ return 0;
+}
+
+static int ci13xxx_imx_resume(struct device *dev)
+{
+ int ret;
+ struct ci13xxx_imx_data *data =
+ platform_get_drvdata(to_platform_device(dev));
+ struct platform_device *plat_ci;
+ struct ci13xxx *ci;
+
+ plat_ci = data->ci_pdev;
+ ci = platform_get_drvdata(plat_ci);
+
+ ret = clk_prepare_enable(data->clk);
+ if (ret) {
+ dev_err(dev,
+ "Failed to prepare or enable clock, err=%d\n", ret);
+ return ret;
+ }
+
+ if (hw_read(ci, OP_PORTSC, PORTSC_PHCD)) {
+ hw_write(ci, OP_PORTSC, PORTSC_PHCD, 0);
+ /* Some clks sync between Controller and USB PHY */
+ mdelay(1);
+ }
+
+ if (data->phy)
+ usb_phy_set_suspend(data->phy, 0);
+
+ return ret;
+}
+
+static const struct dev_pm_ops ci13xxx_imx_pm_ops = {
+ .suspend = ci13xxx_imx_suspend,
+ .resume = ci13xxx_imx_resume,
+};
+#endif
+
static const struct of_device_id ci13xxx_imx_dt_ids[] = {
{ .compatible = "fsl,imx27-usb", },
{ /* sentinel */ }
@@ -334,6 +392,9 @@ static struct platform_driver ci13xxx_imx_driver = {
.name = "imx_usb",
.owner = THIS_MODULE,
.of_match_table = ci13xxx_imx_dt_ids,
+#ifdef CONFIG_PM
+ .pm = &ci13xxx_imx_pm_ops,
+#endif
},
};
--
1.7.0.4
--
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