[PATCH 0/2] usb: gadget: f_uvc: SuperSpeed fixes

[PATCH 0/2] usb: gadget: f_uvc: SuperSpeed fixes

[Roger Quadros]

Hi Laurent & Felipe,

These are some fixes for SuperSpeed case.

--
cheers,
-roger

Roger Quadros (2):
  usb: gadget: f_uvc: Fix SuperSpeed companion descriptor's
    wBytesPerInterval
  usb: gadget: f_uvc: Sanity check wMaxPacketSize for SuperSpeed

 drivers/usb/gadget/function/f_uvc.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

-- 
2.7.4

[PATCH 1/2] usb: gadget: f_uvc: Fix SuperSpeed companion descriptor's wBytesPerInterval

[Roger Quadros]

The streaming_maxburst module parameter is 0 offset (0..15)
so we must add 1 while using it for wBytesPerInterval
calculation for the SuperSpeed companion descriptor.

Without this host uvcvideo driver will always see the wrong
wBytesPerInterval for SuperSpeed uvc gadget and may not find
a suitable video interface endpoint.
e.g. for streaming_maxburst = 0 case it will always
fail as wBytePerInterval was evaluating to 0.

Cc: stable@vger.kernel.org
Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 drivers/usb/gadget/function/f_uvc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index 29b41b5..c7689d0 100644
--- a/drivers/usb/gadget/function/f_uvc.c
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -625,7 +625,7 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
 	uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst;
 	uvc_ss_streaming_comp.wBytesPerInterval =
 		cpu_to_le16(max_packet_size * max_packet_mult *
-			    opts->streaming_maxburst);
+			    (opts->streaming_maxburst + 1));
 
 	/* Allocate endpoints. */
 	ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep);
-- 
2.7.4

Re: [PATCH 1/2] usb: gadget: f_uvc: Fix SuperSpeed companion descriptor's wBytesPerInterval

[Roger Quadros]

Felipe,

On 08/03/17 16:05, Roger Quadros wrote:
> The streaming_maxburst module parameter is 0 offset (0..15)
> so we must add 1 while using it for wBytesPerInterval
> calculation for the SuperSpeed companion descriptor.
> 
> Without this host uvcvideo driver will always see the wrong
> wBytesPerInterval for SuperSpeed uvc gadget and may not find
> a suitable video interface endpoint.
> e.g. for streaming_maxburst = 0 case it will always
> fail as wBytePerInterval was evaluating to 0.
> 
> Cc: stable@vger.kernel.org
> Signed-off-by: Roger Quadros <rogerq@ti.com>

Please pick this one for v4.11-rc with Laurent's Reviewed-by. Thanks.

> ---
>  drivers/usb/gadget/function/f_uvc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
> index 29b41b5..c7689d0 100644
> --- a/drivers/usb/gadget/function/f_uvc.c
> +++ b/drivers/usb/gadget/function/f_uvc.c
> @@ -625,7 +625,7 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
>  	uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst;
>  	uvc_ss_streaming_comp.wBytesPerInterval =
>  		cpu_to_le16(max_packet_size * max_packet_mult *
> -			    opts->streaming_maxburst);
> +			    (opts->streaming_maxburst + 1));
>  
>  	/* Allocate endpoints. */
>  	ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep);
> 

-- 
cheers,
-roger

[PATCH 2/2] usb: gadget: f_uvc: Sanity check wMaxPacketSize for SuperSpeed

[Roger Quadros]

As per USB3.0 Specification "Table 9-20. Standard Endpoint Descriptor",
for interrupt and isochronous endpoints, wMaxPacketSize must be set to
1024 if the endpoint defines bMaxBurst to be greater than zero.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 drivers/usb/gadget/function/f_uvc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index c7689d0..f8a1881 100644
--- a/drivers/usb/gadget/function/f_uvc.c
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -594,6 +594,14 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
 	opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U);
 	opts->streaming_maxburst = min(opts->streaming_maxburst, 15U);
 
+	/* For SS, wMaxPacketSize has to be 1024 if bMaxBurst is not 0 */
+	if (opts->streaming_maxburst &&
+	    (opts->streaming_maxpacket % 1024) != 0) {
+		opts->streaming_maxpacket = roundup(opts->streaming_maxpacket, 1024);
+		INFO(cdev, "overriding streaming_maxpacket to %d\n",
+		     opts->streaming_maxpacket);
+	}
+
 	/* Fill in the FS/HS/SS Video Streaming specific descriptors from the
 	 * module parameters.
 	 *
-- 
2.7.4

Re: [PATCH 0/2] usb: gadget: f_uvc: SuperSpeed fixes

[Laurent Pinchart]

Hi Roger,

Thank you for the patches.

On Wednesday 08 Mar 2017 16:05:42 Roger Quadros wrote:
> Hi Laurent & Felipe,
> 
> These are some fixes for SuperSpeed case.

For both patches,

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> --
> cheers,
> -roger
> 
> Roger Quadros (2):
>   usb: gadget: f_uvc: Fix SuperSpeed companion descriptor's
>     wBytesPerInterval
>   usb: gadget: f_uvc: Sanity check wMaxPacketSize for SuperSpeed
> 
>  drivers/usb/gadget/function/f_uvc.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)

-- 
Regards,

Laurent Pinchart