| Message ID | 20210308125338.4824-1-pawell@gli-login.cadence.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] usb: gadget: uvc: add bInterval checking for HS mode | expand |
On 21-03-08 13:53:38, Pawel Laszczak wrote: > From: Pawel Laszczak <pawell@cadence.com> > > Patch adds extra checking for bInterval passed by configfs. > The 5.6.4 chapter of USB Specification (rev. 2.0) say: > "A high-bandwidth endpoint must specify a period of 1x125 µs > (i.e., a bInterval value of 1)." > > The issue was observed during testing UVC class on CV. > I treat this change as improvement because we can control > bInterval by configfs. > > Signed-off-by: Pawel Laszczak <pawell@cadence.com> > > --- > Changlog: > v2: > - removed duplicated assignment > > drivers/usb/gadget/function/f_uvc.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c > index 44b4352a2676..ed77a126a74f 100644 > --- a/drivers/usb/gadget/function/f_uvc.c > +++ b/drivers/usb/gadget/function/f_uvc.c > @@ -633,7 +633,12 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f) > > uvc_hs_streaming_ep.wMaxPacketSize = > cpu_to_le16(max_packet_size | ((max_packet_mult - 1) << 11)); > - uvc_hs_streaming_ep.bInterval = opts->streaming_interval; > + > + /* A high-bandwidth endpoint must specify a bInterval value of 1 */ > + if (max_packet_mult > 1) > + uvc_hs_streaming_ep.bInterval = 1; > + else > + uvc_hs_streaming_ep.bInterval = opts->streaming_interval; > > uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size); > uvc_ss_streaming_ep.bInterval = opts->streaming_interval; > -- > 2.25.1 > Reviewed-by: Peter Chen <peter.chen@kernel.org> -- Thanks, Peter Chen
Hi Pawel, Thank you for the patch. On Mon, Mar 08, 2021 at 01:53:38PM +0100, Pawel Laszczak wrote: > From: Pawel Laszczak <pawell@cadence.com> > > Patch adds extra checking for bInterval passed by configfs. > The 5.6.4 chapter of USB Specification (rev. 2.0) say: > "A high-bandwidth endpoint must specify a period of 1x125 µs > (i.e., a bInterval value of 1)." > > The issue was observed during testing UVC class on CV. > I treat this change as improvement because we can control > bInterval by configfs. > > Signed-off-by: Pawel Laszczak <pawell@cadence.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Felipe, could you take this patch in your tree ? > --- > Changlog: > v2: > - removed duplicated assignment > > drivers/usb/gadget/function/f_uvc.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c > index 44b4352a2676..ed77a126a74f 100644 > --- a/drivers/usb/gadget/function/f_uvc.c > +++ b/drivers/usb/gadget/function/f_uvc.c > @@ -633,7 +633,12 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f) > > uvc_hs_streaming_ep.wMaxPacketSize = > cpu_to_le16(max_packet_size | ((max_packet_mult - 1) << 11)); > - uvc_hs_streaming_ep.bInterval = opts->streaming_interval; > + > + /* A high-bandwidth endpoint must specify a bInterval value of 1 */ > + if (max_packet_mult > 1) > + uvc_hs_streaming_ep.bInterval = 1; > + else > + uvc_hs_streaming_ep.bInterval = opts->streaming_interval; > > uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size); > uvc_ss_streaming_ep.bInterval = opts->streaming_interval; -- Regards, Laurent Pinchart
diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c index 44b4352a2676..ed77a126a74f 100644 --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -633,7 +633,12 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f) uvc_hs_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size | ((max_packet_mult - 1) << 11)); - uvc_hs_streaming_ep.bInterval = opts->streaming_interval; + + /* A high-bandwidth endpoint must specify a bInterval value of 1 */ + if (max_packet_mult > 1) + uvc_hs_streaming_ep.bInterval = 1; + else + uvc_hs_streaming_ep.bInterval = opts->streaming_interval; uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size); uvc_ss_streaming_ep.bInterval = opts->streaming_interval;