usb: dwc3: dwc3-omap: get rid of ->prepare()/->complete()

Enabling the core interrupts in complete is too late for
XHCI, and stops it from proper operation. The root of the
problem is due to a disagreement between dwc3-omap and XHCI
about when IRQs should be enabled.

As it turns out, ->resume's documentation states that:

"... generally the driver is expected to start working
again, responding to hardware events and software requests
(the device itself may be left in a low-power state, waiting
for a runtime resume to occur) ..."

From that we infer that IRQs must be unmasked by the end of
->resume().

Due to that, we will remove ->prepare() and ->complete() and
disable/enable interrupts in ->suspend()/->resume().

Acked-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: George Cherian <george.cherian@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 2 insertions, 18 deletions

diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
index a0aa9f3da441..172d64e585b6 100644
--- a/drivers/usb/dwc3/dwc3-omap.c
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -593,27 +593,12 @@ static const struct of_device_id of_dwc3_match[] = {
 MODULE_DEVICE_TABLE(of, of_dwc3_match);
 
 #ifdef CONFIG_PM_SLEEP
-static int dwc3_omap_prepare(struct device *dev)
-{
-        struct dwc3_omap        *omap = dev_get_drvdata(dev);
-
-        dwc3_omap_disable_irqs(omap);
-
-        return 0;
-}
-
-static void dwc3_omap_complete(struct device *dev)
-{
-        struct dwc3_omap        *omap = dev_get_drvdata(dev);
-
-        dwc3_omap_enable_irqs(omap);
-}
-
 static int dwc3_omap_suspend(struct device *dev)
 {
         struct dwc3_omap        *omap = dev_get_drvdata(dev);
 
         omap->utmi_otg_status = dwc3_omap_read_utmi_status(omap);
+        dwc3_omap_disable_irqs(omap);
 
         return 0;
 }
@@ -623,6 +608,7 @@ static int dwc3_omap_resume(struct device *dev)
         struct dwc3_omap        *omap = dev_get_drvdata(dev);
 
         dwc3_omap_write_utmi_status(omap, omap->utmi_otg_status);
+        dwc3_omap_enable_irqs(omap);
 
         pm_runtime_disable(dev);
         pm_runtime_set_active(dev);
@@ -632,8 +618,6 @@ static int dwc3_omap_resume(struct device *dev)
 }
 
 static const struct dev_pm_ops dwc3_omap_dev_pm_ops = {
-        .prepare        = dwc3_omap_prepare,
-        .complete       = dwc3_omap_complete,
 
         SET_SYSTEM_SLEEP_PM_OPS(dwc3_omap_suspend, dwc3_omap_resume)
 };