Hi, On Wed, Jul 15, 2015 at 09:49:05AM +0000, Subbaraya Sundeep Bhatta wrote: > Hi John, > > > -----Original Message----- > > From: Felipe Balbi [mailto:balbi@xxxxxx] > > Sent: Tuesday, July 14, 2015 12:29 AM > > To: John Youn > > Cc: balbi@xxxxxx; Subbaraya Sundeep Bhatta; gregkh@xxxxxxxxxxxxxxxxxxx; > > linux-usb@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > > stable@xxxxxxxxxxxxxxx > > Subject: Re: [PATCH v2 3/3] usb: dwc3: gadget: return error if command > > sent to DEPCMD register fails > > > > Hi, > > > > On Mon, Jul 13, 2015 at 05:50:49PM +0000, John Youn wrote: > > > On 7/11/2015 12:29 PM, Felipe Balbi wrote: > > > > Hi, > > > > > > > > On Sat, Jul 11, 2015 at 05:17:32PM +0000, Subbaraya Sundeep Bhatta > > wrote: > > > >>>>>> Hi Felipe, > > > >>>>>> > > > >>>>>> Just an update on this. > > > >>>>>> > > > >>>>>> I'm trying to get this working with our latest IP with dwc3 > > > >>>>>> from your testing/next branch. It fails the usbtest with a > > > >>>>>> problem unrelated to this patch. > > > >>>>>> . > > > >>>>>> It passes on 4.1.1. > > > >>>>>> > > > >>>>>> I'll have to look into the failure but I won't get to it until > > > >>>>>> next week as I'm off the rest of this week. > > > >>>>> > > > >>>>> interesting... If you could post failure signature, I can help > > > >>>>> looking at it, but I guess it's too late to ask :-) > > > >>>>> > > > >>>>> thanks for helping though > > > >>>>> > > > >>>> > > > >>>> > > > >>>> Hi Felipe, > > > >>>> > > > >>>> Nevermind about my issue, it ended up being a setup-related > > problem. > > > >>>> > > > >>>> I actually do see the same error as you due to this series of patches. > > > >>>> Except I see it happening before even the first iteration. I get > > > >>>> a completion status of 1 for the Set Endpoint Transfer Resources > > > >>>> command. I'm not sure why this is. > > > >>>> > > > >>>> I don't see any conflict with any previous Transfer Complete. > > > >> > > > >> Same behavior at my end too. Fails before first iteration and I get > > > >> completion status of 1 for Set Endpoint Resource command. Attached > > > >> the logs of testing done with this patch and without this patch. > > > >> Without this patch I often see completion status of 1 for Set > > > >> Endpoint Transfer Resources command for Bulk and Isoc endpoints but > > > >> test proceeds because driver just logs command completion status > > > >> and moves on. We can revert this patch for time being. IP version is > > 2.90a. > > > > > > > > yeah, that's what I mean, it really seems like it's the IP misbehaving. > > > > > > > > John, let's try to figure out what's the root cause of this, we > > > > really want to use command completion status at some point, but for > > > > now we need to revert the patch :-( > > > > > > > > Let me know if you want me to log STARS ticket on your solvnet system. > > > > > > > > cheers > > > > > > > > > > Hi Felipe, > > > > > > We found the issue last week. > > > > > > The start config command isn't getting called during SET_INTERFACE. > > > Thus the transfer resource index isn't getting reset, and with > > > multiple SET_INTERFACE commands it will eventually exhaust the > > > resources. > > > > > > I tried out a fix and it works for me. I'll send it out separately for > > > review. > > Thanks John for debugging :). Yes we are not handling SET_INTERFACE similar to > SET_CONFIGURATION in driver. I guess we follow > "Alternate Initialization on SetInterface Request" sequence as per data book. > Felipe can confirm this. > > > > > Thanks a lot John. Not sure how come we missed that for such a long time > > :-) Let's Cc stable and get it plugged ASAP :-) > > > > > Also, I noticed that the trace message that shows control transfers > > > doesn't show the SET_INTERFACE properly. Any idea why this is? > > > > > > For example, here is the line in the trace that corresponds to the > > > SET_INTERFACE: > > > irq/33-dwc3-10808 [003] d... 2443.494368: dwc3_ctrl_req: > > bRequestType > > > 01 bRequest 0b wValue 0001 wIndex 0000 wLength 0 > > Can you please elaborate? What is expected here? Did you mean it shows wrong info > (other than the request actually sent by Host) ? I have been looking more at this and the reason why we're failing is a patch from Paul, which I quote below: commit b23c843992b659d537514e6493d673284f5d6724 Author: Paul Zimmerman <Paul.Zimmerman@xxxxxxxxxxxx> Date: Fri Sep 30 10:58:42 2011 +0300 usb: dwc3: gadget: fix DEPSTARTCFG for non-EP0 EPs DEPSTARTCFG for non-EP0 EPs must only be sent once per config [ balbi@xxxxxx : changed config_start to start_config_issued ] Signed-off-by: Paul Zimmerman <paulz@xxxxxxxxxxxx> Signed-off-by: Felipe Balbi <balbi@xxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 0231eba1f53d..502582ce1fc6 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -529,6 +529,7 @@ static inline void dwc3_trb_to_nat(struct dwc3_trb_hw *hw, struct dwc3_trb *nat) * @ep0_status_pending: ep0 status response without a req is pending * @ep0_bounced: true when we used bounce buffer * @ep0_expect_in: true when we expect a DATA IN transfer + * @start_config_issued: true when StartConfig command has been issued * @ep0_next_event: hold the next expected event * @ep0state: state of endpoint zero * @link_state: link state @@ -576,6 +577,7 @@ struct dwc3 { unsigned ep0_status_pending:1; unsigned ep0_bounced:1; unsigned ep0_expect_in:1; + unsigned start_config_issued:1; enum dwc3_ep0_next ep0_next_event; enum dwc3_ep0_state ep0state; diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c index cc27c4ec498d..2def48ed30ea 100644 --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -455,6 +455,7 @@ static int dwc3_ep0_set_config(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl) u32 cfg; int ret; + dwc->start_config_issued = false; cfg = le16_to_cpu(ctrl->wValue); switch (dwc->dev_state) { diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index b2820aa9fa46..9c0174a8f46c 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -237,8 +237,12 @@ static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep) if (dep->number != 1) { cmd = DWC3_DEPCMD_DEPSTARTCFG; /* XferRscIdx == 0 for ep0 and 2 for the remaining */ - if (dep->number > 1) + if (dep->number > 1) { + if (dwc->start_config_issued) + return 0; + dwc->start_config_issued = true; cmd |= DWC3_DEPCMD_PARAM(2); + } return dwc3_send_gadget_ep_cmd(dwc, 0, cmd, ¶ms); } @@ -1161,6 +1165,8 @@ static int dwc3_gadget_start(struct usb_gadget *g, reg |= DWC3_DCFG_SUPERSPEED; dwc3_writel(dwc->regs, DWC3_DCFG, reg); + dwc->start_config_issued = false; + /* Start with SuperSpeed Default */ dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512); @@ -1592,6 +1598,7 @@ static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc) dwc3_stop_active_transfers(dwc); dwc3_disconnect_gadget(dwc); + dwc->start_config_issued = false; dwc->gadget.speed = USB_SPEED_UNKNOWN; } @@ -1643,6 +1650,7 @@ static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc) dwc3_stop_active_transfers(dwc); dwc3_clear_stall_all_ep(dwc); + dwc->start_config_issued = false; /* Reset device address to zero */ reg = dwc3_readl(dwc->regs, DWC3_DCFG); So the problem is that even though endpoint *is* indeed disabled, start_config_issued is still true and we return before sending that command. According to Paul's patch it's important that we send start_config only once per config. However, I do see that section 9.1.5, table 9-5 of Databook 2.90a has no conditionals around DEPSTARTCFG. Reverting that patch from Paul, I can see that it all works fine. I'll send the revert still today, but I need you guys to confirm that it really works on your platforms. According to Paul he "can't see how the driver would work without" start_config_issued trick. cheers -- balbi
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