Hi,

Gregory CLEMENT [off-list ref] writes:

quoted

quoted

quoted

if it is the case then it didn't fix the issue I had.

I activated the following debug line:

[musb_hdrc]musb_interrupt =_ "** IRQ %s usb%04x tx%04x rx%04x\012"
[musb_dsps]dsps_interrupt =p "usbintr (%x) epintr(%x)\012"

But I didn't get any interrupt while disconnecting the cable without any
device connected on it (whereas I got an interrupt when I connected it).

Note that I applied this patch instead of the "usb: musb: dsps: handle
the otg_state_a_wait_vrise_timeout case", is what you had in mind ?

yeah, that's what I had in mind. But your patch seems wrong :-)

I tried writing a more correct version here and found 2 issues:

a) bit 3 doesn't do anything :-p I cannot read IRQs from mentor's
registers

b) when setting RESET_ISOLATION bit, reads of CTRL register hang. Note
that according to TRM, RESET_ISOLATION _must_ be set prior to a soft
reset and cleared afterwards. But right after setting RESET_ISOLATION,
if I try a read of CTRL, it'll hang forever.

The datasheet seems not very coherent about it,

on one side we have:
"This bit should be set high prior to setting bit 0 and cleared after bit 0
is cleared."

and on the other side:
"Both the soft_reset and soft_reset_isolation bits should be asserted
simultaneously."

The hang you saw could be explained by the following:
"Setting only the soft_reset_isolation bit will cause all USB0 output
signals to go to a known constant value via multiplexers.
This will
prevent future access to USB0."  page 2567

good catch. Setting them together makes the hang go away.

I still have the other problem, which is legacy IRQ reporting mode not
really working.

-- 
balbi
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 818 bytes
Desc: not available
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20151208/d9555e81/attachment.sig>