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 B65E32D97B5 for ; Wed, 6 May 2026 15:03:45 +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=1778079825; cv=none; b=DpjGL5GjqvJAVi0ekdYjMDMFydxhRZ8q+DRyjPOtAnxUyR6Dow88xvW2rnrNaxDwxY/IeJT5gz2kbRaz8ANOYbqPMgzvIfE+5bLRRKBqEC8R5P+GFz8jwd3Z9DPDlDQmKyVkSD8ckjs3G+Fp7hqbxR1k1RLxbQAbSoD5OxRCowU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778079825; c=relaxed/simple; bh=XMCz6pVTQXDvMBoGmgoWUcaGlKtV1xjgP8f7so25kPE=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=u+uSg8DBAy7VhTmf6RKxjUzBcPuOU15iqTXiD/ekN3zXxpf9Utc7B3dAit7/RA9ZhKofFY3SwH1nRdSMFURrRCViDQKPUBfR0ZylDcwdyiJQYVNlnGQuPW6fZ/nbknzZeHeFnHwadx2pmkcExaqXZo/rn8WTlARJjXvCWskGVQc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AkgW3dnB; 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="AkgW3dnB" Received: by smtp.kernel.org (Postfix) with ESMTPS id 57675C2BCB8 for ; Wed, 6 May 2026 15:03:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778079825; bh=XMCz6pVTQXDvMBoGmgoWUcaGlKtV1xjgP8f7so25kPE=; h=From:To:Subject:Date:In-Reply-To:References:From; b=AkgW3dnB4ZXxdvyV7EQDtZwOntROq5j3VtFhxBGMSawRJH2ahmOFklcIqWU1BYP4O e02fLxHwLsF0nqgALsQhR4dDa9vb6aSfxrbqEYvIVkBZzc/VdyamHkNNuFB1NGY1A/ 58DCoDdHoz7v2wlUqY+E6DEYbYvJzA0dtpwGBdbByoRdzeF9KI+JXroeCVmsUiDzk1 zMbrvU97QTEbbyd9XpGwoPQX0WQ+tCIdQcPujfb2ggF5JmaTCZuoDAl9w5HrEGnD7P NU5fECA9SX2g5R10Brs9ecnWLoqTNH9QANPFzwZ5cVCJUhmyQztC5dzxlY/vrEBCGk j0ZeDoUTUdxqg== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 4DED6C41616; Wed, 6 May 2026 15:03:45 +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, 06 May 2026 15:03:44 +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: dylan_robinson@motu.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 #27 from dylan_robinson@motu.com --- Regarding the start_frame, I want to advocate for treating urb->start_frame= as an input parameter when URB_ISO_ASAP is not set. In looking into porting our drivers to Linux, we've found the current behavior challenging to accommoda= te. As Alan mentioned, different host controllers have different representation= s of frame numbers. Other platforms address this by only exposing a normalized, frame (not microframe) index, while handling controller-specific conversion= s in the host controller driver. --=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.=