This is a note to let you know that I've just added the patch titled
Revert "usb: gadget: f_uvc: change endpoint allocation in
to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-testing branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will be merged to the usb-next branch sometime soon,
after it passes testing, and the merge window is open.
If you have any questions about this process, please let me know.
>From 895ee5aefb7e24203de5dffae7ce9a02d78fa3d1 Mon Sep 17 00:00:00 2001
From: Frank Li <Frank.Li@xxxxxxx>
Date: Sun, 24 Dec 2023 10:38:16 -0500
Subject: Revert "usb: gadget: f_uvc: change endpoint allocation in
uvc_function_bind()"
This reverts commit 3c5b006f3ee800b4bd9ed37b3a8f271b8560126e.
gadget_is_{super|dual}speed() API check UDC controller capitblity. It
should pass down highest speed endpoint descriptor to UDC controller. So
UDC controller driver can reserve enough resource at check_config(),
especially mult and maxburst. So UDC driver (such as cdns3) can know need
at least (mult + 1) * (maxburst + 1) * wMaxPacketSize internal memory for
this uvc functions.
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
Link: https://lore.kernel.org/r/20231224153816.1664687-5-Frank.Li@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/gadget/function/f_uvc.c | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index da5f28e471b0..929666805bd2 100644
--- a/drivers/usb/gadget/function/f_uvc.c
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -721,13 +721,29 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
}
uvc->enable_interrupt_ep = opts->enable_interrupt_ep;
- ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_streaming_ep);
+ /*
+ * gadget_is_{super|dual}speed() API check UDC controller capitblity. It should pass down
+ * highest speed endpoint descriptor to UDC controller. So UDC controller driver can reserve
+ * enough resource at check_config(), especially mult and maxburst. So UDC driver (such as
+ * cdns3) can know need at least (mult + 1) * (maxburst + 1) * wMaxPacketSize internal
+ * memory for this uvc functions. This is the only straightforward method to resolve the UDC
+ * resource allocation issue in the current gadget framework.
+ */
+ if (gadget_is_superspeed(c->cdev->gadget))
+ ep = usb_ep_autoconfig_ss(cdev->gadget, &uvc_ss_streaming_ep,
+ &uvc_ss_streaming_comp);
+ else if (gadget_is_dualspeed(cdev->gadget))
+ ep = usb_ep_autoconfig(cdev->gadget, &uvc_hs_streaming_ep);
+ else
+ ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_streaming_ep);
+
if (!ep) {
uvcg_info(f, "Unable to allocate streaming EP\n");
goto error;
}
uvc->video.ep = ep;
+ uvc_fs_streaming_ep.bEndpointAddress = uvc->video.ep->address;
uvc_hs_streaming_ep.bEndpointAddress = uvc->video.ep->address;
uvc_ss_streaming_ep.bEndpointAddress = uvc->video.ep->address;
--
2.43.0
