From: bugzilla-daemon@bugzilla.kernel.org
To: linux-usb@vger.kernel.org
Subject: [Bug 207065] C-media USB audio device stops working from 5.2.0-rc3 onwards
Date: Thu, 09 Apr 2020 12:32:05 +0000 [thread overview]
Message-ID: <bug-207065-208809-acaXt6vp4x@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-207065-208809@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=207065
Mathias Nyman (mathias.nyman@linux.intel.com) changed:
What |Removed |Added
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CC| |mathias.nyman@linux.intel.c
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--- Comment #4 from Mathias Nyman (mathias.nyman@linux.intel.com) ---
Thanks, traces show its related to Clearing TT buffer after a STALL on
endpoint 0.
The first stall looks like a protocol stall, not a function stall, meaning that
endpoint isn't really halted, just that the device does not support the
request in the control transfer.
Anyway, xhci starts clearing what it assumes is a halted endpoint,
including clearing the hub TT buffer.
Specs are a bit unclear if TT should be cleared in this case,
or at least I couldn't find it.
I'll create a tespatch that doesn't clear TT buffer on protocol stalls,
and add excessive tracing and debugging to it.
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next prev parent reply other threads:[~2020-04-09 12:32 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-02 15:57 [Bug 207065] New: C-media USB audio device stops working from 5.2.0-rc3 onwards bugzilla-daemon
2020-04-02 16:00 ` [Bug 207065] " bugzilla-daemon
2020-04-02 16:01 ` bugzilla-daemon
2020-04-08 10:08 ` bugzilla-daemon
2020-04-09 12:32 ` bugzilla-daemon [this message]
2020-04-09 14:01 ` Alan Stern
2020-04-09 12:34 ` bugzilla-daemon
2020-04-09 14:01 ` bugzilla-daemon
2020-04-10 17:58 ` bugzilla-daemon
2020-04-14 10:07 ` bugzilla-daemon
2020-04-14 16:30 ` bugzilla-daemon
2020-04-14 16:30 ` bugzilla-daemon
2020-04-14 16:34 ` bugzilla-daemon
2020-04-16 13:00 ` bugzilla-daemon
2020-09-29 10:58 ` bugzilla-daemon
2020-09-29 10:59 ` bugzilla-daemon
2020-09-29 11:02 ` bugzilla-daemon
2020-09-29 11:50 ` bugzilla-daemon
2020-09-29 11:53 ` bugzilla-daemon
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