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-rw-r--r--Documentation/usb/dwc3.txt12
1 files changed, 10 insertions, 2 deletions
diff --git a/Documentation/usb/dwc3.txt b/Documentation/usb/dwc3.txt
index 1d02c01d1c7c..f94a7ba16573 100644
--- a/Documentation/usb/dwc3.txt
+++ b/Documentation/usb/dwc3.txt
@@ -1,6 +1,11 @@
+===========
+DWC3 driver
+===========
+
+
+TODO
+~~~~
- TODO
-~~~~~~
Please pick something while reading :)
- Convert interrupt handler to per-ep-thread-irq
@@ -9,6 +14,7 @@ Please pick something while reading :)
until the command completes which is bad.
Implementation idea:
+
- dwc core implements a demultiplexing irq chip for interrupts per
endpoint. The interrupt numbers are allocated during probe and belong
to the device. If MSI provides per-endpoint interrupt this dummy
@@ -19,6 +25,7 @@ Please pick something while reading :)
- dwc3_send_gadget_ep_cmd() will sleep in wait_for_completion_timeout()
until the command completes.
- the interrupt handler is split into the following pieces:
+
- primary handler of the device
goes through every event and calls generic_handle_irq() for event
it. On return from generic_handle_irq() in acknowledges the event
@@ -40,6 +47,7 @@ Please pick something while reading :)
for command completion.
Latency:
+
There should be no increase in latency since the interrupt-thread has a
high priority and will be run before an average task in user land
(except the user changed priorities).