Hi, Jassi Brar <jassisinghb...@gmail.com> writes: > On Wed, Oct 14, 2015 at 9:18 PM, Felipe Balbi <ba...@ti.com> wrote: >> >> Hi, >> >> Jassi Brar <jassisinghb...@gmail.com> writes: >>> On Wed, Oct 14, 2015 at 8:42 PM, Felipe Balbi <ba...@ti.com> wrote: >>>> >>>> Hi, >>>> >>>> jaswinder.si...@linaro.org writes: >>>>> From: Jassi Brar <jaswinder.si...@linaro.org> >>>>> >>>>> We must return 0 for any OUT setup request, otherwise >>>>> protocol error may occur. >>>> >>>> have you seen any such errors ? >>>> >>> Yes. While testing my new udc driver. >>> >>> >>>> Care to describe what problems you have seen and which UDC you were using, >>>n> what's the exact scenario. How have you tested this ? >>>> >>> The udc I am writing the driver for is not yet public. To test my >>> driver at lowest level possible, I use 'usbmon' to capture and analyze >>> traffic since I don't have any hardware probe. >>> >>> I see the following on gadget side >>> ------- >>> configfs-gadget gadget: non-core control req21.20 v0000 i0001 l7 >>> configfs-gadget gadget: acm ttyGS0 req21.20 v0000 i0001 l7 >>> configfs-gadget gadget: acm ttyGS0 completion, err -71 >>> ------- >>> >>> and the following on host side usbmon capture >>> ------- >>> ffff88041ed01f00 540296433 S Co:3:023:0 s 21 20 0000 0001 0007 7 = >>> 80250000 000008 >>> ffff88041ed01f00 540296790 C Co:3:023:0 -71 0 >>> ------- >> >> and you did you even consider this could be a bug in your new UDC driver >> at all ? This works fine with other UDCs. >> > I was happy too until I decided to look closely at the annoying print > on gadget side. This is a non-fatal error and visible only when > debugging is enabled, so every udc seems 'fine'
I tried with my sniffer and saw no stalls, nothing. My setup request to set line coding to 9600 baud worked just fine. >> How far are you in developing this new UDC driver ? >> > Its done and tested for fsg+acm composite and each alone. stress tests ? Meaning, did you leave it running for a couple of weeks at least ? >> Did you run USBCV at all ? >> > No USBCV not yet. I borrowed Windows machine to test FSG but forgot > USBCV since it's been years I wrote last udc driver. Will give it a > try tomorrow but I don't think it could emulate the sequence I hit > with f_acm. USBCV might already have some ACM test cases and it should exercise all mandatory setup requests. >> Are you sure you're implementing EP0 handling correctly ? What >> sort of tests have you done with this UDC ? Is it working with testusb >> against a known good host (EHCI and XHCI should be good for that) ? >> > Well as I said I have been looking at low level transfers and > everything is good. still, run testusb with the acompanying shell script and keep it running for at least 2 weeks. > BTW, should the gadget stack ever queue a Non-ZLP as reply to some > setup request that has USB_DIR_IN not set? What phase of the setup are we talking about ? If it has a DATA phase, then data can have non-ZLP transfers and it can also require a ZLP to end the data phase itself (if wLength % wMaxPacketSize == 0). Status phase is always zlp. -- balbi
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