From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 27CA7296BA9 for ; Wed, 5 Nov 2025 09:06:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762333612; cv=none; b=aw7lRbQ9Hd0BdHQMoFjf3ar9AcOJg5nXDolt+KJ8vgeVfVRWw2RRJEPgFm7/2rnAxlBxW1JPw5y78fZZ1sk+E8mSX5vQ+3ELeAqpPyNHY/Kq/O+oXfxmMGGvFGeNaSbmvh3uUHI+3VXlkaEY0tQzqJouslGrtIhFk7gAI7csPuM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762333612; c=relaxed/simple; bh=d0zXdAlo5XTvGeTA2SDEUJVktnj2M4KRwho6e2EBLkc=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=k/5zL7Thqd0+gRKiRwuib9DYOmprulE32wkj6JLTqoIKrnUWXT5t9CPDWW03mZ4+cpfAWExig1LBEVoYxlaH6TkYshKOfxPaQ0K7AbRAZm2IdrHJAHAAOfoNdKkJoj/IYaqGVD9pTNBA6qKX2u2YNdEZ0NKMTKDcBRpvaJlX2m8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EegTR+ed; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="EegTR+ed" Received: by smtp.kernel.org (Postfix) with ESMTPS id A0152C16AAE for ; Wed, 5 Nov 2025 09:06:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762333611; bh=d0zXdAlo5XTvGeTA2SDEUJVktnj2M4KRwho6e2EBLkc=; h=From:To:Subject:Date:In-Reply-To:References:From; b=EegTR+edtlYXyJAgbK0ntuZrLfh3iH2CBP8Wb6sIYbo66xBw1PTR4VAyVtGTepVAb Us4stS+Ng3CK2q6SKekQ2V/CqGn3ed4Amz4Zwcl46NZBAfQOFVIZzSTlAkdgq5e0C5 MYsU2pRtt3CKNDl9xj0xxwCHw4KY5G8T181p2KNSeFi/yNhyi/btwti2IAOB9xyYqW uvt5wZ4xJqBS8ptQcLiXUsagtn4eX1teuyACHNFXIiNDUpM/lBo9jf+3GGmmH3gUrd 2NGpBxxG9f+e1qKrZsGpbn1Qy8XzzQebI5UGPo+nvock/dew8kZQR0QPYwl1++RSAF qjAskGbBtpZZg== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 98B85C3279F; Wed, 5 Nov 2025 09:06:51 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-usb@vger.kernel.org Subject: [Bug 220748] usb: xhci_queue_isoc_tx_prepare ignore start_frame and always assumes URB_ISO_ASAP is set Date: Wed, 05 Nov 2025 09:06:51 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo drivers_usb@kernel-bugs.kernel.org X-Bugzilla-Product: Drivers X-Bugzilla-Component: USB X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: michal.pecio@gmail.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: drivers_usb@kernel-bugs.kernel.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D220748 --- Comment #4 from Micha=C5=82 Pecio (michal.pecio@gmail.com) --- As for debugging, you can obviously print anything to dmesg with printk()/pr_info()/xhci_info(). But this may generate quite a noise on isoc endpoints if you print in every interval. If you mount debugfs and go to /sys/kernel/debug/usb/xhci//devices// you will find epXX directories and trbs file in each. The file contains a human-readable dump of the transfer ring written by the driver for given endpoint, so you can inspect if the TRBs make sense. This only works while = the endpoint is enabled, i.e. if you stop streaming and driver switches to an e= mpty altsetting zero, the endpoint will disappear from debugfs. --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=