diff options
| author | Bhupesh Sharma <bhupesh.sharma@st.com> | 2012-06-01 13:38:54 +0400 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2012-06-04 19:12:25 +0400 |
| commit | 3de6e63f7845e99981e489ddccf70b3ec02fe00a (patch) | |
| tree | 87480666c4c3715ec12e33423e9fc8381f363489 /drivers/usb/gadget/f_uvc.c | |
| parent | 0a00790ff4755f2e3eab907a43725cff59fc074b (diff) | |
| download | linux-3de6e63f7845e99981e489ddccf70b3ec02fe00a.tar.xz | |
usb: gadget: uvc: Fix string descriptor STALL issue when multiple uvc functions are added to a configuration
This patch solved the string descriptor STALL issue when we add multiple UVC
functions in a single configuration using a 'webcam.c' like composite driver.
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@st.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/gadget/f_uvc.c')
| -rw-r--r-- | drivers/usb/gadget/f_uvc.c | 38 |
1 files changed, 22 insertions, 16 deletions
diff --git a/drivers/usb/gadget/f_uvc.c b/drivers/usb/gadget/f_uvc.c index 2022fe492148..054c35a22fbf 100644 --- a/drivers/usb/gadget/f_uvc.c +++ b/drivers/usb/gadget/f_uvc.c @@ -619,22 +619,28 @@ uvc_bind_config(struct usb_configuration *c, uvc->desc.fs_streaming = fs_streaming; uvc->desc.hs_streaming = hs_streaming; - /* Allocate string descriptor numbers. */ - if ((ret = usb_string_id(c->cdev)) < 0) - goto error; - uvc_en_us_strings[UVC_STRING_ASSOCIATION_IDX].id = ret; - uvc_iad.iFunction = ret; - - if ((ret = usb_string_id(c->cdev)) < 0) - goto error; - uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id = ret; - uvc_control_intf.iInterface = ret; - - if ((ret = usb_string_id(c->cdev)) < 0) - goto error; - uvc_en_us_strings[UVC_STRING_STREAMING_IDX].id = ret; - uvc_streaming_intf_alt0.iInterface = ret; - uvc_streaming_intf_alt1.iInterface = ret; + /* maybe allocate device-global string IDs, and patch descriptors */ + if (uvc_en_us_strings[UVC_STRING_ASSOCIATION_IDX].id == 0) { + /* Allocate string descriptor numbers. */ + ret = usb_string_id(c->cdev); + if (ret < 0) + goto error; + uvc_en_us_strings[UVC_STRING_ASSOCIATION_IDX].id = ret; + uvc_iad.iFunction = ret; + + ret = usb_string_id(c->cdev); + if (ret < 0) + goto error; + uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id = ret; + uvc_control_intf.iInterface = ret; + + ret = usb_string_id(c->cdev); + if (ret < 0) + goto error; + uvc_en_us_strings[UVC_STRING_STREAMING_IDX].id = ret; + uvc_streaming_intf_alt0.iInterface = ret; + uvc_streaming_intf_alt1.iInterface = ret; + } /* Register the function. */ uvc->func.name = "uvc"; |