2011/2/4 B, Ravi <[email protected]>: > >> >> Hi, >> >> >> >> I have backported the UVC gadget patch by laurent pinchart on a custom >> >> DM365 board. >> >> It fails to allocate the required endpoints : >> >> >> >> ep = usb_ep_autoconfig(cdev->gadget, &uvc_streaming_ep); >> >> if (!ep) { >> >> INFO(cdev, "Unable to allocate streaming EP\n"); >> >> goto error; >> >> } >> >> >> >> I can see the message "Unable to allocate streaming EP" in the log. >> >> How can I debug / fix this ? >> >> >> >> The mass storage gadget is working fine. >> >> >> >> Here is the failing endpoint descriptor : >> >> >> >> static struct usb_endpoint_descriptor uvc_streaming_ep = { >> >> .bLength = USB_DT_ENDPOINT_SIZE, >> >> .bDescriptorType = USB_DT_ENDPOINT, >> >> .bEndpointAddress = USB_DIR_IN, >> >> .bmAttributes = USB_ENDPOINT_XFER_ISOC, >> >> .wMaxPacketSize = cpu_to_le16(1024), >> >> .bInterval = 1, >> >> }; >> >> >> > >> > The above endpoint requires endpoint fifo size to be 1024. Check with >> the fifo table entries in musb_core.c file and update as per requirement. >> > >> >> So I can either change the fifo_mode module paramete to pick another >> config, or >> change the endpoint config to use a smaller packet size ? >> > > If the UVC driver requirement may be 1024 bytes packet size, then you cannot > change, what you can do is change the current fifo-mode > configuration sizes as per your device requirements. > > For example : > /* mode 4 - fits in 4KB */ > static struct musb_fifo_cfg __devinitdata mode_4_cfg[] = { > { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, > { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, > { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 1024, }, > { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 1024, }, > { .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 256, }, > { .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 256, }, > Thank you, I can see that more recent kernel have the possibility to specify this config in platform_data, which is great !
> Ravi > >> >> Jean-Philippe François >> >> _______________________________________________ >> >> Davinci-linux-open-source mailing list >> >> [email protected] >> >> http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source >> > > _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
