Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
IronPort-SDR: pOq4pq8/CYklsXybLSyFmlJqXXqLl5d8e4+i7qFc2FJcoIQtgMdBUD4/KlHiLmwikIChAKWh3X
 kwZ4hAXwPJ/A==
IronPort-SDR: sQESveKzFayyMS5hcTi1zub1Bu4kAspDUDRNxWD3JP3oW0JK6SP/Y1wfLDxmHpEArOYo9KBr0q
 p9b2aAx22mkw==
Subject: Re: XHCI vs PCM2903B/PCM2904 part 2
To:     Rik van Riel <riel@surriel.com>,
        Alan Stern <stern@rowland.harvard.edu>
Cc:     linux-usb <linux-usb@vger.kernel.org>, alsa-devel@alsa-project.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Mathias Nyman <mathias.nyman@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>
References: <273cc1c074cc4a4058f31afe487fb233f5cf0351.camel@surriel.com>
 <20200520163840.GA11084@rowland.harvard.edu>
 <667d8d156fa5d8420ef1c3b1d08b94a10d2398cc.camel@surriel.com>
 <20200520203417.GA23602@rowland.harvard.edu>
 <d75c3a3cda51149a054838652243de2b8ac20854.camel@surriel.com>
 <059878e7-75b8-e033-ec9f-7e6b73df8f78@linux.intel.com>
 <b98bfefc2911e5265b6c28d9730a18e7953b847c.camel@surriel.com>
 <6917929c7dd7786b5b673743ce45bbcd56e6b1f1.camel@surriel.com>
 <90D456E4-328F-49F7-99C4-D729E38FA04E@surriel.com>
From:   Mathias Nyman <mathias.nyman@linux.intel.com>
Openpgp: preference=signencrypt
Autocrypt: addr=mathias.nyman@linux.intel.com; prefer-encrypt=mutual; keydata=
 mQINBFMB0ccBEADd+nZnZrFDsIjQtclVz6OsqFOQ6k0nQdveiDNeBuwyFYykkBpaGekoHZ6f
 lH4ogPZzQ+pzoJEMlRGXc881BIggKMCMH86fYJGfZKWdfpg9O6mqSxyEuvBHKe9eZCBKPvoC
 L2iwygtO8TcXXSCynvXSeZrOwqAlwnxWNRm4J2ikDck5S5R+Qie0ZLJIfaId1hELofWfuhy+
 tOK0plFR0HgVVp8O7zWYT2ewNcgAzQrRbzidA3LNRfkL7jrzyAxDapuejuK8TMrFQT/wW53e
 uegnXcRJaibJD84RUJt+mJrn5BvZ0MYfyDSc1yHVO+aZcpNr+71yZBQVgVEI/AuEQ0+p9wpt
 O9Wt4zO2KT/R5lq2lSz1MYMJrtfFRKkqC6PsDSB4lGSgl91XbibK5poxrIouVO2g9Jabg04T
 MIPpVUlPme3mkYHLZUsboemRQp5/pxV4HTFR0xNBCmsidBICHOYAepCzNmfLhfo1EW2Uf+t4
 L8IowAaoURKdgcR2ydUXjhACVEA/Ldtp3ftF4hTQ46Qhba/p4MUFtDAQ5yeA5vQVuspiwsqB
 BoL/298+V119JzM998d70Z1clqTc8fiGMXyVnFv92QKShDKyXpiisQn2rrJVWeXEIVoldh6+
 J8M3vTwzetnvIKpoQdSFJ2qxOdQ8iYRtz36WYl7hhT3/hwkHuQARAQABtCdNYXRoaWFzIE55
 bWFuIDxtYXRoaWFzLm55bWFuQGdtYWlsLmNvbT6JAjsEEwECACUCGwMGCwkIBwMCBhUIAgkK
 CwQWAgMBAh4BAheABQJTAeo1AhkBAAoJEFiDn/uYk8VJOdIP/jhA+RpIZ7rdUHFIYkHEKzHw
 tkwrJczGA5TyLgQaI8YTCTPSvdNHU9Rj19mkjhUO/9MKvwfoT2RFYqhkrtk0K92STDaBNXTL
 JIi4IHBqjXOyJ/dPADU0xiRVtCHWkBgjEgR7Wihr7McSdVpgupsaXhbZjXXgtR/N7PE0Wltz
 hAL2GAnMuIeJyXhIdIMLb+uyoydPCzKdH6znfu6Ox76XfGWBCqLBbvqPXvk4oH03jcdt+8UG
 2nfSeti/To9ANRZIlSKGjddCGMa3xzjtTx9ryf1Xr0MnY5PeyNLexpgHp93sc1BKxKKtYaT0
 lR6p0QEKeaZ70623oB7Sa2Ts4IytqUVxkQKRkJVWeQiPJ/dZYTK5uo15GaVwufuF8VTwnMkC
 4l5X+NUYNAH1U1bpRtlT40aoLEUhWKAyVdowxW4yGCP3nL5E69tZQQgsag+OnxBa6f88j63u
 wxmOJGNXcwCerkCb+wUPwJzChSifFYmuV5l89LKHgSbv0WHSN9OLkuhJO+I9fsCNvro1Y7dT
 U/yq4aSVzjaqPT3yrnQkzVDxrYT54FLWO1ssFKAOlcfeWzqrT9QNcHIzHMQYf5c03Kyq3yMI
 Xi91hkw2uc/GuA2CZ8dUD3BZhUT1dm0igE9NViE1M7F5lHQONEr7MOCg1hcrkngY62V6vh0f
 RcDeV0ISwlZWuQINBFMB0ccBEACXKmWvojkaG+kh/yipMmqZTrCozsLeGitxJzo5hq9ev31N
 2XpPGx4AGhpccbco63SygpVN2bOd0W62fJJoxGohtf/g0uVtRSuK43OTstoBPqyY/35+VnAV
 oA5cnfvtdx5kQPIL6LRcxmYKgN4/3+A7ejIxbOrjWFmbWCC+SgX6mzHHBrV0OMki8R+NnrNa
 NkUmMmosi7jBSKdoi9VqDqgQTJF/GftvmaZHqgmVJDWNrCv7UiorhesfIWPt1O/AIk9luxlE
 dHwkx5zkWa9CGYvV6LfP9BznendEoO3qYZ9IcUlW727Le80Q1oh69QnHoI8pODDBBTJvEq1h
 bOWcPm/DsNmDD8Rwr/msRmRyIoxjasFi5WkM/K/pzujICKeUcNGNsDsEDJC5TCmRO/TlvCvm
 0X+vdfEJRZV6Z+QFBflK1asUz9QHFre5csG8MyVZkwTR9yUiKi3KiqQdaEu+LuDD2CGF5t68
 xEl66Y6mwfyiISkkm3ETA4E8rVZP1rZQBBm83c5kJEDvs0A4zrhKIPTcI1smK+TWbyVyrZ/a
 mGYDrZzpF2N8DfuNSqOQkLHIOL3vuOyx3HPzS05lY3p+IIVmnPOEdZhMsNDIGmVorFyRWa4K
 uYjBP/W3E5p9e6TvDSDzqhLoY1RHfAIadM3I8kEx5wqco67VIgbIHHB9DbRcxQARAQABiQIf
 BBgBAgAJBQJTAdHHAhsMAAoJEFiDn/uYk8VJb7AQAK56tgX8V1Wa6RmZDmZ8dmBC7W8nsMRz
 PcKWiDSMIvTJT5bygMy1lf7gbHXm7fqezRtSfXAXr/OJqSA8LB2LWfThLyuuCvrdNsQNrI+3
 D+hjHJjhW/4185y3EdmwwHcelixPg0X9EF+lHCltV/w29Pv3PiGDkoKxJrnOpnU6jrwiBebz
 eAYBfpSEvrCm4CR4hf+T6MdCs64UzZnNt0nxL8mLCCAGmq1iks9M4bZk+LG36QjCKGh8PDXz
 9OsnJmCggptClgjTa7pO6040OW76pcVrP2rZrkjo/Ld/gvSc7yMO/m9sIYxLIsR2NDxMNpmE
 q/H7WO+2bRG0vMmsndxpEYS4WnuhKutoTA/goBEhtHu1fg5KC+WYXp9wZyTfeNPrL0L8F3N1
 BCEYefp2JSZ/a355X6r2ROGSRgIIeYjAiSMgGAZMPEVsdvKsYw6BH17hDRzltNyIj5S0dIhb
 Gjynb3sXforM/GVbr4mnuxTdLXQYlj2EJ4O4f0tkLlADT7podzKSlSuZsLi2D+ohKxtP3U/r
 42i8PBnX2oAV0UIkYk7Oel/3hr0+BP666SnTls9RJuoXc7R5XQVsomqXID6GmjwFQR5Wh/RE
 IJtkiDAsk37cfZ9d1kZ2gCQryTV9lmflSOB6AFZkOLuEVSC5qW8M/s6IGDfYXN12YJaZPptJ fiD/
Message-ID: <4a463fe0-f1af-a0f9-af2e-e36c060e8105@linux.intel.com>
Date:   Tue, 30 Jun 2020 17:27:10 +0300
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.9.0
MIME-Version: 1.0
In-Reply-To: <90D456E4-328F-49F7-99C4-D729E38FA04E@surriel.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 30.6.2020 16.08, Rik van Riel wrote:
> I misread the code, it's not a bitfield, so state 1 means an endpoint marked with running state. The next urb is never getting a response, though.
> 
> However, the xhci spec says an endpoint is halted upon a babble error.

I was looking at the same, so according to specs this state shouldn't be possible. 

> 
> The code right above the babble handling case adds halted into the endpoint state itself. Does the code handling the babble error need to do something similar to trigger cleanup elsewhere? 

It's a flag to prevent ringing the doorbell for a halted endpoint.
Anyway, reset endpoint is meant to recover an endpoint in a halted state.
Resetting non-halted endpoints will just lead to a context state error, and
besides, isoc endpoints shouldn't halt.

Anyways, I haven't got any better idea at the moment.
You can try and see what a forced reset does with:

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 2c255d0620b0..d79aca0df6d4 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1900,8 +1900,7 @@ static int xhci_requires_manual_halt_cleanup(struct xhci_hcd *xhci,
                 * endpoint anyway.  Check if a babble halted the
                 * endpoint.
                 */
-               if (GET_EP_CTX_STATE(ep_ctx) == EP_STATE_HALTED)
-                       return 1;
+               return 1;
 
        return 0;
 }

Traces also showed thet endpoint doorbell was rang after th babble error, so
we know that didn't help restarting the endpoint.

-Mathias