This patch implements system suspend/resume functions for Marvell
otg controller.
If OTG is enabled, OTG driver will do most of the work.
If not, we will check clock gating.
If clock gating is enabled, the UDC will be started/stopped automatically.
If not, UDC will be started/stopped in suspend/resume functions.
Signed-off-by: Neil Zhang <zhangwm@xxxxxxxxxxx>
---
drivers/usb/gadget/mv_udc_core.c | 47 +++++++++++++++++++++++++++++---------
1 files changed, 36 insertions(+), 11 deletions(-)
diff --git a/drivers/usb/gadget/mv_udc_core.c b/drivers/usb/gadget/mv_udc_core.c
index 8405dbf..de11e0b 100644
--- a/drivers/usb/gadget/mv_udc_core.c
+++ b/drivers/usb/gadget/mv_udc_core.c
@@ -2382,7 +2382,30 @@ static int mv_udc_suspend(struct device *_dev)
{
struct mv_udc *udc = the_controller;
- udc_stop(udc);
+ /* if OTG is enabled, the following will be done in OTG driver */
+ if (udc->transceiver)
+ return 0;
+
+ if (udc->pdata->vbus && udc->pdata->vbus->poll)
+ if (udc->pdata->vbus->poll() == VBUS_HIGH) {
+ dev_info(&udc->dev->dev, "USB cable is connected!\n");
+ return -EAGAIN;
+ }
+
+ /*
+ * Only when cable is unplugged, udc can suspend.
+ * So do not care about clock_gating == 1.
+ */
+ if (!udc->clock_gating) {
+ udc_stop(udc);
+
+ spin_lock_irq(&udc->lock);
+ /* stop all usb activities */
+ stop_activity(udc, udc->driver);
+ spin_unlock_irq(&udc->lock);
+
+ mv_udc_disable_internal(udc);
+ }
return 0;
}
@@ -2392,20 +2415,22 @@ static int mv_udc_resume(struct device *_dev)
struct mv_udc *udc = the_controller;
int retval;
- if (udc->pdata->phy_init) {
- retval = udc->pdata->phy_init(udc->phy_regs);
- if (retval) {
- dev_err(&udc->dev->dev,
- "init phy error %d when resume back\n",
- retval);
+ /* if OTG is enabled, the following will be done in OTG driver*/
+ if (udc->transceiver)
+ return 0;
+
+ if (!udc->clock_gating) {
+ retval = mv_udc_enable_internal(udc);
+ if (retval)
return retval;
+
+ if (udc->driver && udc->softconnect) {
+ udc_reset(udc);
+ ep0_reset(udc);
+ udc_start(udc);
}
}
- udc_reset(udc);
- ep0_reset(udc);
- udc_start(udc);
-
return 0;
}
--
1.7.4.1
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