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 A42D183A14; Tue, 12 Nov 2024 12:24:57 +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=1731414297; cv=none; b=IK9IxB+k2eseJohjTBRWPzx902zJu4OeT/AQeg1mVi+xElBOXUgT4AIe9ca9W26GSdm1cAdM7zpyTYWe/c0qkg6MrotTO5XZO+Ei2taLqaPDVj4H3OS7p3v274wItuj0TNw9P2I6WivPUYHto9kZL1tSLCLeGC6DJC3ZVXqCS6Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731414297; c=relaxed/simple; bh=X6d1zT2QDXa58F8WXCsMe7nwrLK4sby0tHk8Pq+BFTU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=BT1n7loEyxo1+Baezmqv2UELdlLPwTFQxVOgIW/bP7NvRA+n01D54RtiNhSgNKyzSkXJCQny+4MeB2SxHJ/p6F1B8NyrM3AtR53usVxL3pPH+xjT6ALvMtmZG+cUOPA5xwVThHbnZdAp4CH4r3NhQg1zTYdnQMODsBt4/xuDfyg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=WW1c9+Rl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="WW1c9+Rl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C0FE1C4CED5; Tue, 12 Nov 2024 12:24:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1731414297; bh=X6d1zT2QDXa58F8WXCsMe7nwrLK4sby0tHk8Pq+BFTU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=WW1c9+RlWnWRvdB8wGCEo2a4vcUIovm1PnSgF49erLU7hJlvHw7hgAZG8IufdvsYC LjheEyMdam1+1HeLuhkXm1Km2Tm5nThEbcEcLO/9Ynfbb1jXn7AFrXZIjRaN7elBxM Tu1sgqepXyDz5ufOE7khneVd8dTO36uZDn2jqtaI= Date: Tue, 12 Nov 2024 13:24:53 +0100 From: Greg KH To: Raju Rangoju Cc: linux-usb@vger.kernel.org, mathias.nyman@intel.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] usb: xhci: quirk for data loss in ISOC transfers Message-ID: <2024111226-spender-saturate-dc6e@gregkh> References: <20241112122104.120633-1-Raju.Rangoju@amd.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241112122104.120633-1-Raju.Rangoju@amd.com> On Tue, Nov 12, 2024 at 05:51:04PM +0530, Raju Rangoju wrote: > During the High-Speed Isochronous Audio transfers, xHCI > controller on certain AMD platforms experiences momentary data > loss. This results in Missed Service Errors (MSE) being > generated by the xHCI. > > The root cause of the MSE is attributed to the ISOC OUT endpoint > being omitted from scheduling. This can happen either when an IN > endpoint with a 64ms service interval is pre-scheduled prior to > the ISOC OUT endpoint or when the interval of the ISOC OUT > endpoint is shorter than that of the IN endpoint. Consequently, > the OUT service is neglected when an IN endpoint with a service > interval exceeding 32ms is scheduled concurrently (every 64ms in > this scenario). > > This issue is particularly seen on certain older AMD platforms. > To mitigate this problem, it is recommended to adjust the service > interval of the IN endpoint to not exceed 32ms (interval 8). This > adjustment ensures that the OUT endpoint will not be bypassed, > even if a smaller interval value is utilized. > > Signed-off-by: Raju Rangoju You don't want this backported to any older kernels? Why not? thanks, greg k-h