From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-2757788-1519127807-2-17216220755273059986 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.001, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='US', FromHeader='com', MailFrom='org' X-Spam-charsets: X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: linux-usb-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1519127807; b=nefSHln1jjtEz4CNsch9QJtAwvz450dCo2g+F8/zqJvpGCG Dlvo8xSlHG8nQqvS2vAUl28Q5AdFdH1rpF4u8Yx6S9ISJzIq0XUirED6rR/ILmLW IapjZe033qKuZCPErWwQ5RG2R2cZ6/RAUqCzPiUwFaMFQQXiqyCubLXzY4u75esj fpUGYE6NHfk4fb50FqmcEMGXmTr+TmWhr52N0T6gYP1V0CpNcZqBmQDiraPHsw+L cU2m1BRKmvpocB1EzthkuA7BDG15NtbteKscy8uQILDw2kz+kqtpWJqcT/cB1AfR e/5wYVFyGgNKTuV23SSKYK7gYt1sod6se/DWvFw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:in-reply-to:references :date:message-id:mime-version:content-type:sender:list-id; s= arctest; t=1519127807; bh=lzWcb+H6RvluGEawnCK3fxCX9qTSooqqeHxN0k z4AyQ=; b=uxhCjsoNOujGlTgPxfclL79Y/9c/jlstEj5UsMiNokjM/y71eJbp0N Q3C1BN9Q1IvruMw2ZgVQYHWUzjO2jo6BguokT8QHw3LX0AwlhQHFehjdpoQwXi/T Ta91BjiJeOG5C9Fjb4lETyN0htpWdRjCX3gyp6hE+bGU+e72dL35uBULc+GGTTaW hUcod7vkJjnSwW/65Vc6auh9zuDGxzdd0XfWTE2HgozjJLUgtXh6jv6tk8S90X54 oIGaS7Dp8lDcOdjB6wcr8HJidfoLN4DnBJjUtVpML8K2Nnhf7+6cpuvt7bbqtBgH R+Uo+V3KnE1rT/QHv5Ion4sYr3aFS3pQ== ARC-Authentication-Results: i=1; mx4.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linux.intel.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-usb-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linux.intel.com header.result=pass header_org.domain=intel.com header_org.result=pass header_is_org_domain=no Authentication-Results: mx4.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linux.intel.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-usb-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linux.intel.com header.result=pass header_org.domain=intel.com header_org.result=pass header_is_org_domain=no Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751581AbeBTL4d (ORCPT ); Tue, 20 Feb 2018 06:56:33 -0500 Received: from mga03.intel.com ([134.134.136.65]:34314 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751567AbeBTL4c (ORCPT ); Tue, 20 Feb 2018 06:56:32 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.46,539,1511856000"; d="scan'208";a="202406582" From: Felipe Balbi To: Richard Leitner , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Cc: gregkh@linuxfoundation.org, stern@rowland.harvard.edu, linux@roeck-us.net, mathias.nyman@linux.intel.com, johan@kernel.org, ekorenevsky@gmail.com, peter.chen@nxp.com, drake@endlessm.com, joe@perches.com, Richard Leitner Subject: Re: [PATCH v2] usb: core: introduce per-port over-current counters In-Reply-To: <20180220115033.29496-1-dev@g0hl1n.net> References: <20180220115033.29496-1-dev@g0hl1n.net> Date: Tue, 20 Feb 2018 13:55:54 +0200 Message-ID: <87k1v7q3hx.fsf@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-usb-owner@vger.kernel.org X-Mailing-List: linux-usb@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Hi, Richard Leitner writes: > From: Richard Leitner > > For some userspace applications information on the number of > over-current conditions at specific USB hub ports is relevant. > > In our case we have a series of USB hardware (using the cp210x driver) > which communicates using a proprietary protocol. These devices sometimes > trigger an over-current situation on some hubs. In case of such an > over-current situation the USB devices offer an interface for reducing > the max used power. As these conditions are quite rare and imply > performance reductions of the device we don't want to reduce the max > power always. > > Therefore give user-space applications the possibility to react > adequately by introducing an over_current_counter in the usb port struct > which is exported via sysfs. why don't you just provide more than one configuration with several bMaxPower fields? Then host OS should choose correct configuration based on power budget. -- balbi