From: Huang Rui Date: Wed, 26 Jun 2013 17:08:11 +0000 (+0800) Subject: usb: dwc3: fix wrong bit mask in dwc3_event_type X-Git-Tag: firefly_0821_release~176^2~5622^2~3^2~17 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1974d494dea05ea227cb42f5e918828801e237aa;p=firefly-linux-kernel-4.4.55.git usb: dwc3: fix wrong bit mask in dwc3_event_type 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". Cc: Signed-off-by: Huang Rui Signed-off-by: Felipe Balbi --- diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index b69d322e3cab..27dad993b007 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -759,8 +759,8 @@ struct dwc3 { 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