usb: dwc3: implement runtime PM
this patch implements the most basic pm_runtime
support for dwc3. Whenever USB cable is dettached,
then we will allow core to runtime_suspend.
Runtime suspending will involve completely tearing
down event buffers and require a full soft-reset of
the IP.
Note that a further optimization could be
implemented once we decide to support hibernation,
which is to allow runtime_suspend with cable
connected when bus is in U3. That's subject to a
separate patch, however.
Tested-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 5148c56..94b9fd2 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -763,6 +763,7 @@
* @lpm_nyet_threshold: LPM NYET response threshold
* @hird_threshold: HIRD threshold
* @hsphy_interface: "utmi" or "ulpi"
+ * @connected: true when we're connected to a host, false otherwise
* @delayed_status: true when gadget driver asks for delayed status
* @ep0_bounced: true when we used bounce buffer
* @ep0_expect_in: true when we expect a DATA IN transfer
@@ -773,6 +774,7 @@
* 0 - utmi_sleep_n
* 1 - utmi_l1_suspend_n
* @is_fpga: true when we are using the FPGA board
+ * @pending_events: true when we have pending IRQs to be handled
* @pullups_connected: true when Run/Stop bit is set
* @setup_packet_pending: true when there's a Setup Packet in FIFO. Workaround
* @start_config_issued: true when StartConfig command has been issued
@@ -907,6 +909,7 @@
const char *hsphy_interface;
+ unsigned connected:1;
unsigned delayed_status:1;
unsigned ep0_bounced:1;
unsigned ep0_expect_in:1;
@@ -914,6 +917,7 @@
unsigned has_lpm_erratum:1;
unsigned is_utmi_l1_suspend:1;
unsigned is_fpga:1;
+ unsigned pending_events:1;
unsigned pullups_connected:1;
unsigned setup_packet_pending:1;
unsigned three_stage_setup:1;
@@ -1139,6 +1143,7 @@
#if !IS_ENABLED(CONFIG_USB_DWC3_HOST)
int dwc3_gadget_suspend(struct dwc3 *dwc);
int dwc3_gadget_resume(struct dwc3 *dwc);
+void dwc3_gadget_process_pending_events(struct dwc3 *dwc);
#else
static inline int dwc3_gadget_suspend(struct dwc3 *dwc)
{
@@ -1149,6 +1154,10 @@
{
return 0;
}
+
+static inline void dwc3_gadget_process_pending_events(struct dwc3 *dwc)
+{
+}
#endif /* !IS_ENABLED(CONFIG_USB_DWC3_HOST) */
#if IS_ENABLED(CONFIG_USB_DWC3_ULPI)