From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933110AbdCJQEg (ORCPT ); Fri, 10 Mar 2017 11:04:36 -0500 Received: from lelnx194.ext.ti.com ([198.47.27.80]:22535 "EHLO lelnx194.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755365AbdCJQEd (ORCPT ); Fri, 10 Mar 2017 11:04:33 -0500 Subject: Re: [PATCH] usb: xhci: bInterval quirk for TI TUSB73x0 To: Sergei Shtylyov , References: <1489049268-30607-1-git-send-email-rogerq@ti.com> <235e20da-ad1c-d417-02e8-962eaf657d1d@cogentembedded.com> CC: , From: Roger Quadros Message-ID: <1d4406de-c428-a2b2-55b2-5e68d21aab3a@ti.com> Date: Fri, 10 Mar 2017 18:04:27 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0 MIME-Version: 1.0 In-Reply-To: <235e20da-ad1c-d417-02e8-962eaf657d1d@cogentembedded.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/03/17 11:44, Sergei Shtylyov wrote: > Hello! > > On 3/9/2017 11:47 AM, Roger Quadros wrote: > >> As per [1] issue #4, >> "The periodic EP scheduler always tries to schedule the EPs >> that have large intervals (interval equal to or greater than >> 128 microframes) into different microframes. So it maintains >> an internal counter and increments for each large interval >> EP added. When the counter is greater than 128, the scheduler >> rejects the new EP. So when the hub re-enumerated 128 times, >> it trigged this condition." > > Triggered. Should be "triggers" actually. Will fix it. Thanks. > >> This results in Bandwidth error when devices with periodic >> endpoints (ISO/INT) having bInterval > 7 are plugged an >> unplugged several times on a TUSB73x0 xhci host. >> >> Workaround this issue by limiting the bInterval to 7 >> (i.e. interval to 6) for High-speed or faster periodic endpoints. >> >> [1] - http://www.ti.com/lit/er/sllz076/sllz076.pdf >> >> Signed-off-by: Roger Quadros > [...] > > MBR, Sergei > -- cheers, -roger