Re: Atheros TL-721N adapter refuses to enumerate on the USB Bus (ath9k_htc)
Am 11.10.2017 um 20:17 schrieb M D:
> Hi,
> My system details are as follows
>
> Hardware:
> CPU : ARM based platform, imx21
> USB : USB Host Controller 1.1 Full Speed
> Mode
>
> Software:
> Firmware : /lib/firmware/htc_9271.fw
> (version 1.3 / version 1.4)
> Device Driver : Backports (v3.12.8-1)
> OS: Linux Kernel 3.0.101, ARM
> Freescale IMX21ADS
Heh... I doubt this configuration can be more exotic :D
> Problem Statement:
>
> -The WiFi adapter is connected directly to the USB Port and is
> configured in Full Speed mode
> -After it is plugged in, it is enumerated on the Bus (that is,
> executing the instruction lsusb shows the vendor and product
> information)
> -After repeated reboots, after one random reboot the issue
> occurs. (usually 1 out of 5 times) the wlan0 node does not come up
> -When the issue occurs the following details below describe
> the issue at best
>
>
> 1) The adapter is visible on the USB bus (adapter gets enumerated)
> 2) The required modules are loaded
> 3) However the wireless networking node, wlan0 does not come up
> 4) One of the threads created during the init goes into a D state
>
> root 1024 0.0 0.0 0 0 ?D11:06 0:00
> [firmware/htc_92]
>
> In the file drivers/net/wireless/ath/ath9k/hif_usb.c
> [
>
> hif_usb.c
> ...
>
> ret = request_firmware_nowait(THIS_MODULE, true, hif_dev->fw_name,
> _dev->udev->dev, GFP_KERNEL,
> hif_dev, ath9k_hif_usb_firmware_cb);
>
>
> compat_firmware_class.c
> ...
> task = kthread_run(request_firmware_work_func, fw_work,
> "firmware/%s", name);
> ]
>
>
> 5) This is recoverable only after manually unplugging out the Adapter.
>
> ROOT CAUSE OF THE ISSUE:
> 6) The underlying cause is due to the wifi adapter being configured in
> FULL SPEED mode. Due to this the endpoints 3 and 4 get configured as
> BULK and not INT.
>
>
> After some investigation, I made the following changes which helps to
> recover the adapter when the issue occurs,
>
> ---
> ../original-backports/backports-3.12.8-1/drivers/net/wireless/ath/ath9k/hif_usb.c
> 2017-10-11 10:50:05.043241000 -0700
> +++ drivers/net/wireless/ath/ath9k/hif_usb.c2017-10-11
> 10:50:03.154255000 -0700
> @@ -24,6 +24,8 @@
> MODULE_FIRMWARE(FIRMWARE_AR7010_1_1);
> MODULE_FIRMWARE(FIRMWARE_AR9271);
>
> +static void ath9k_hif_usb_reboot(struct usb_device *udev);
> +
>
> @@ -1189,7 +1193,12 @@
> {
> struct usb_device *udev = interface_to_usbdev(interface);
> struct hif_device_usb *hif_dev;
> - int ret = 0;
> +
> +struct usb_host_interface *alt ;
> +struct usb_endpoint_descriptor *endp;
> +
> + int ret;
> + int idx, EP = 0;
>
> if (id->driver_info == STORAGE_DEVICE)
> return send_eject_command(interface);
> @@ -1212,6 +1221,44 @@
>
> init_completion(_dev->fw_done);
>
> + alt = _dev->interface->altsetting[0];
> +
> +
> + for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
> +endp = >endpoint[idx].desc;
> +EP = idx + 1;
> +printk (KERN_ALERT "EndPoint %d is conf as %d\n", EP,
> (endp->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK));
> + /* First FIX EP3. EP3 should never show up as BULK.
> + If it does we have a serious problem.
> + */
> +
> + if (endp->bEndpointAddress==0x83){
> + if ((endp->bmAttributes &
> USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_BULK) {
> + endp->bmAttributes |= USB_ENDPOINT_XFER_INT;
> + endp->bInterval = 1;
> + ath9k_hif_usb_reboot(hif_dev->udev);
> + mdelay(1000);
> + ret = usb_reset_device(hif_dev->udev);
> + mdelay(1000);
> +if (ret)
> + return ret;
> + }
> + }
> +
> +if (endp->bEndpointAddress==0x04){
> + if ((endp->bmAttributes &
> USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_BULK) {
> +endp->bmAttributes |= USB_ENDPOINT_XFER_INT;
> +endp->bInterval = 1;
> + ath9k_hif_usb_reboot(hif_dev->udev);
> + mdelay(1000);
> + ret = usb_reset_device(hif_dev->udev);
> + mdelay(1000);
> + if (ret)
> + return ret;
> + }
> + }
> + }
> +
> /* Find out which firmware to load */
>
> if (IS_AR7010_DEVICE(id->driver_info))
>
>
>
> I see the following output in dmesg
>
> EndPoint 1 is conf as 2
> EndPoint 2 is conf as 2
> EndPoint 3 is conf
Atheros TL-721N adapter refuses to enumerate on the USB Bus (ath9k_htc)
Hi,
My system details are as follows
Hardware:
CPU : ARM based platform, imx21
USB : USB Host Controller 1.1 Full Speed Mode
Software:
Firmware : /lib/firmware/htc_9271.fw
(version 1.3 / version 1.4)
Device Driver : Backports (v3.12.8-1)
OS: Linux Kernel 3.0.101, ARM
Freescale IMX21ADS
Problem Statement:
-The WiFi adapter is connected directly to the USB Port and is
configured in Full Speed mode
-After it is plugged in, it is enumerated on the Bus (that is,
executing the instruction lsusb shows the vendor and product
information)
-After repeated reboots, after one random reboot the issue
occurs. (usually 1 out of 5 times) the wlan0 node does not come up
-When the issue occurs the following details below describe
the issue at best
1) The adapter is visible on the USB bus (adapter gets enumerated)
2) The required modules are loaded
3) However the wireless networking node, wlan0 does not come up
4) One of the threads created during the init goes into a D state
root 1024 0.0 0.0 0 0 ?D11:06 0:00
[firmware/htc_92]
In the file drivers/net/wireless/ath/ath9k/hif_usb.c
[
hif_usb.c
...
ret = request_firmware_nowait(THIS_MODULE, true, hif_dev->fw_name,
_dev->udev->dev, GFP_KERNEL,
hif_dev, ath9k_hif_usb_firmware_cb);
compat_firmware_class.c
...
task = kthread_run(request_firmware_work_func, fw_work,
"firmware/%s", name);
]
5) This is recoverable only after manually unplugging out the Adapter.
ROOT CAUSE OF THE ISSUE:
6) The underlying cause is due to the wifi adapter being configured in
FULL SPEED mode. Due to this the endpoints 3 and 4 get configured as
BULK and not INT.
After some investigation, I made the following changes which helps to
recover the adapter when the issue occurs,
---
../original-backports/backports-3.12.8-1/drivers/net/wireless/ath/ath9k/hif_usb.c
2017-10-11 10:50:05.043241000 -0700
+++ drivers/net/wireless/ath/ath9k/hif_usb.c2017-10-11
10:50:03.154255000 -0700
@@ -24,6 +24,8 @@
MODULE_FIRMWARE(FIRMWARE_AR7010_1_1);
MODULE_FIRMWARE(FIRMWARE_AR9271);
+static void ath9k_hif_usb_reboot(struct usb_device *udev);
+
@@ -1189,7 +1193,12 @@
{
struct usb_device *udev = interface_to_usbdev(interface);
struct hif_device_usb *hif_dev;
- int ret = 0;
+
+struct usb_host_interface *alt ;
+struct usb_endpoint_descriptor *endp;
+
+ int ret;
+ int idx, EP = 0;
if (id->driver_info == STORAGE_DEVICE)
return send_eject_command(interface);
@@ -1212,6 +1221,44 @@
init_completion(_dev->fw_done);
+ alt = _dev->interface->altsetting[0];
+
+
+ for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
+endp = >endpoint[idx].desc;
+EP = idx + 1;
+printk (KERN_ALERT "EndPoint %d is conf as %d\n", EP,
(endp->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK));
+ /* First FIX EP3. EP3 should never show up as BULK.
+ If it does we have a serious problem.
+ */
+
+ if (endp->bEndpointAddress==0x83){
+ if ((endp->bmAttributes &
USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_BULK) {
+ endp->bmAttributes |= USB_ENDPOINT_XFER_INT;
+ endp->bInterval = 1;
+ ath9k_hif_usb_reboot(hif_dev->udev);
+ mdelay(1000);
+ ret = usb_reset_device(hif_dev->udev);
+ mdelay(1000);
+if (ret)
+ return ret;
+ }
+ }
+
+if (endp->bEndpointAddress==0x04){
+ if ((endp->bmAttributes &
USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_BULK) {
+endp->bmAttributes |= USB_ENDPOINT_XFER_INT;
+endp->bInterval = 1;
+ ath9k_hif_usb_reboot(hif_dev->udev);
+ mdelay(1000);
+ ret = usb_reset_device(hif_dev->udev);
+ mdelay(1000);
+ if (ret)
+ return ret;
+ }
+ }
+ }
+
/* Find out which firmware to load */
if (IS_AR7010_DEVICE(id->driver_info))
I see the following output in dmesg
EndPoint 1 is conf as 2
EndPoint 2 is conf as 2
EndPoint 3 is conf as 2
usb 1-2: reset full speed USB device number 2 using imx21-hcd
usb 1-2: device firmware changed
usb 1-2: USB disconnect, device number 2
usbcore: registered new interface driver ath9k_htc
usb 1-2: new full speed USB device number 3 using imx21-hcd
EndPoint 1 is conf as 2
EndPoint 2 is conf as 2
EndPoint 3 is conf as 3
EndPoint 4 is conf as 2
usb 1-2: reset full speed USB device
