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 ? D 11:06 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,
&hif_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.c 2017-10-11
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(&hif_dev->fw_done);
+ alt = &hif_dev->interface->altsetting[0];
+
+
+ for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
+ endp = &alt->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 number 3 using imx21-hcd
EndPoint 5 is conf as 2
EndPoint 6 is conf as 2
usb 1-2: ath9k_htc: Firmware htc_9271.fw requested
usb 1-2: ath9k_htc: Transferred FW: htc_9271.fw, size: 51272
ath9k_htc 1-2:1.0: ath9k_htc: HTC initialized with 33 credits
ath9k_htc 1-2:1.0: ath9k_htc: FW Version: 1.3
Completed ath9k_init_firmware_version
ath: EEPROM regdomain: 0x809c
ath: EEPROM indicates we should expect a country code
ath: doing EEPROM country->regdmn map search
ath: country maps to regdmn code: 0x52
ath: Country alpha2 being used: CN
ath: Regpair used: 0x52
ath9k_hw_set_reset_reg: 1
ieee80211 phy0: Atheros AR9271 Rev:1
Registered led device: ath9k_htc-phy0
These code changes help to reconfigure the WiFi adapter many times.
However at some point of reboot (say 30th reboot), I see
usb 1-2: device descriptor read/64, error -110
hub 1-0:1.0: unable to enumerate USB device on port 2
When this happens, the only way to recover is to manually unplug the
adapter from the USB port.
Could anyone offer any suggestions as to how to overcome this problem?
The issue occurs with both v1.3 and v1.4 htc_9271.fw.
Regards,
Max
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 ? D 11:06 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,
> &hif_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.c 2017-10-11
> 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(&hif_dev->fw_done);
>
> + alt = &hif_dev->interface->altsetting[0];
> +
> +
> + for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
> + endp = &alt->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 number 3 using imx21-hcd
> EndPoint 5 is conf as 2
> EndPoint 6 is conf as 2
> usb 1-2: ath9k_htc: Firmware htc_9271.fw requested
> usb 1-2: ath9k_htc: Transferred FW: htc_9271.fw, size: 51272
> ath9k_htc 1-2:1.0: ath9k_htc: HTC initialized with 33 credits
> ath9k_htc 1-2:1.0: ath9k_htc: FW Version: 1.3
> Completed ath9k_init_firmware_version
> ath: EEPROM regdomain: 0x809c
> ath: EEPROM indicates we should expect a country code
> ath: doing EEPROM country->regdmn map search
> ath: country maps to regdmn code: 0x52
> ath: Country alpha2 being used: CN
> ath: Regpair used: 0x52
> ath9k_hw_set_reset_reg: 1
> ieee80211 phy0: Atheros AR9271 Rev:1
> Registered led device: ath9k_htc-phy0
>
> These code changes help to reconfigure the WiFi adapter many times.
> However at some point of reboot (say 30th reboot), I see
>
> usb 1-2: device descriptor read/64, error -110
> hub 1-0:1.0: unable to enumerate USB device on port 2
>
> When this happens, the only way to recover is to manually unplug the
> adapter from the USB port.
>
> Could anyone offer any suggestions as to how to overcome this problem?
> The issue occurs with both v1.3 and v1.4 htc_9271.fw.
I fear, you should debuge it:
- attach uart on TL-721N to get some debug information from firmware
- use usb analizer to see what is going on with usb traffic.
--
Regards,
Oleksij