usb: dwc3: fix wrong bit mask in dwc3_event_type

commit 1974d494dea05ea227cb42f5e918828801e237aa upstream.

Per dwc3 2.50a spec, the is_devspec bit is used to distinguish the
Device Endpoint-Specific Event or Device-Specific Event (DEVT). If the
bit is 1, the event is represented Device-Specific Event, then use
[7:1] bits as Device Specific Event to marked the type. It has 7 bits,
and we can see the reserved8_31 variable name which means from 8 to 31
bits marked reserved, actually there are 24 bits not 25 bits between
that. And 1 + 7 + 24 = 32, the event size is 4 byes.

So in dwc3_event_type, the bit mask should be:
is_devspec	[0]		1  bit
type		[7:1]		7  bits
reserved8_31	[31:8]		24 bits

This patch should be backported to kernels as old as 3.2, that contain
the commit 72246da40f3719af3bfd104a2365b32537c27d83 "usb: Introduce
DesignWare USB3 DRD Driver".

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 29a8e16..4795c0c 100644 (file)
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -643,8 +643,8 @@ struct dwc3 {
 
 struct dwc3_event_type {
        u32     is_devspec:1;
 
 struct dwc3_event_type {
        u32     is_devspec:1;

-       u32     type:6;
-       u32     reserved8_31:25;
+       u32     type:7;
+       u32     reserved8_31:24;

 } __packed;
 
 #define DWC3_DEPEVT_XFERCOMPLETE       0x01
 } __packed;
 
 #define DWC3_DEPEVT_XFERCOMPLETE       0x01