When an USB_REQ_DFU_DETACH request is received, the device state switch to
DFU_STATE_appDETACH, and then wait for an usb reset to switch to
DFU_STATE_dfuIDLE (through dfu_disable() being called).
I noticed that using dfu-util v0.7 on my AT91SAM9260 board, the programming
failed because of the device not entering the DFU_STATE_dfuIDLE after an usb
reset (staying in the DFU_STATE_appDETACH state).
According to the current implementation, once the USB_REQ_DFU_DETACH is sent
and right after the usb reset, if the DFU client set more than one
configuration (by iterating over them for example), the device state will reset
to the DFU_STATE_appDETACH state on the 2nd iteration because of the following
line in set_config (composite.c, line 362) :
...
if(cdev->config)
reset_config(); // will call dfu_disable() again!
...
The attached patch is a *try* to fix the issue by leaving the device in the
DFU_STATE_dfuIDLE state after an usb reset if already in that state. dfu-util
will complain about the device already in the DFU_STATE_dfuIDLE on the next
start, but everything is still working and thus usable.
This may need a REVISIT, but since the dfu_disable() gets called on both
configuration change and usb reset, we can't fix this easily for now..
Signed-off-by: Cerrato Renaud <r.cerr...@til-technologies.fr>
---
drivers/usb/gadget/dfu.c | 6 ++----
1 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/gadget/dfu.c b/drivers/usb/gadget/dfu.c
index e051879..e4af567 100644
--- a/drivers/usb/gadget/dfu.c
+++ b/drivers/usb/gadget/dfu.c
@@ -514,14 +514,12 @@ static void dfu_disable(struct usb_function *f)
struct f_dfu *dfu = func_to_dfu(f);
switch (dfu->dfu_state) {
+ case DFU_STATE_dfuIDLE:
case DFU_STATE_appDETACH:
dfu->dfu_state = DFU_STATE_dfuIDLE;
break;
- case DFU_STATE_dfuMANIFEST_WAIT_RST:
- dfu->dfu_state = DFU_STATE_appIDLE;
- break;
default:
- dfu->dfu_state = DFU_STATE_appDETACH;
+ dfu->dfu_state = DFU_STATE_appIDLE;
break;
}
--
1.7.2.5
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