From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BE713C11F65 for ; Wed, 30 Jun 2021 08:45:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9FACD61CD4 for ; Wed, 30 Jun 2021 08:45:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233668AbhF3IsJ (ORCPT ); Wed, 30 Jun 2021 04:48:09 -0400 Received: from comms.puri.sm ([159.203.221.185]:59142 "EHLO comms.puri.sm" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233536AbhF3IsG (ORCPT ); Wed, 30 Jun 2021 04:48:06 -0400 Received: from localhost (localhost [127.0.0.1]) by comms.puri.sm (Postfix) with ESMTP id D4AFBDF765; Wed, 30 Jun 2021 01:45:07 -0700 (PDT) Received: from comms.puri.sm ([127.0.0.1]) by localhost (comms.puri.sm [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0ZoC0VD6kptH; Wed, 30 Jun 2021 01:45:03 -0700 (PDT) From: Martin Kepplinger To: martin.kepplinger@puri.sm, bvanassche@acm.org Cc: jejb@linux.ibm.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-scsi@vger.kernel.org, martin.petersen@oracle.com, kernel@puri.sm, stern@rowland.harvard.edu Subject: [PATCH v5 0/3] fix runtime PM for SD card readers Date: Wed, 30 Jun 2021 10:44:50 +0200 Message-Id: <20210630084453.186764-1-martin.kepplinger@puri.sm> Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org hi, (According to Alan Stern, "as far as I know, all") SD card readers send MEDIA_CHANGED unit attention notification on (runtime) resume. We cannot use runtime PM with these devices as I/O always fails in that case. This fixes runtime PM for SD cardreaders. I'd appreciate any feedback. To enable runtime PM for an SD cardreader number 0:0:0:0, do: echo 0 > /sys/module/block/parameters/events_dfl_poll_msecs echo 1000 > /sys/bus/scsi/devices/0:0:0:0/power/autosuspend_delay_ms echo auto > /sys/bus/scsi/devices/0:0:0:0/power/control thank you, martin revision history ---------------- v5: (thank you Bart) * simplify the sense request itself and remove unnecessary code v4: (thank you Bart and Alan) * send SENSE REQUEST in sd instead of adding a global scsi error flag. https://lore.kernel.org/linux-scsi/20210628133412.1172068-1-martin.kepplinger@puri.sm/T/#t v3: (thank you Bart) * create a new BLIST entry to mark affected devices instead of the sysfs module parameter for sd only. still, only sd implements handling the flag for now. * cc linux-pm list https://lore.kernel.org/linux-scsi/20210328102531.1114535-1-martin.kepplinger@puri.sm/ v2: https://lore.kernel.org/linux-scsi/20210112093329.3639-1-martin.kepplinger@puri.sm/ * move module parameter to sd * add Documentation v1: https://lore.kernel.org/linux-scsi/20210111152029.28426-1-martin.kepplinger@puri.sm/T/ For the full background, the discussion started in June 2020 here: https://lore.kernel.org/linux-scsi/20200623111018.31954-1-martin.kepplinger@puri.sm/ Martin Kepplinger (3): scsi: devinfo: add new flag BLIST_MEDIA_CHANGE scsi: sd: send REQUEST SENSE for BLIST_MEDIA_CHANGE devices in runtime_resume() scsi: devinfo: add BLIST_MEDIA_CHANGE for Ultra HS-SD/MMC usb cardreaders drivers/scsi/scsi_devinfo.c | 1 + drivers/scsi/sd.c | 26 +++++++++++++++++++++++++- include/scsi/scsi_devinfo.h | 6 +++--- 3 files changed, 29 insertions(+), 4 deletions(-) -- 2.30.2