From patchwork Tue May 18 15:06:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 442885 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham 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 D97F0C433B4 for ; Tue, 18 May 2021 15:06:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B51D761353 for ; Tue, 18 May 2021 15:06:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344697AbhERPHl (ORCPT ); Tue, 18 May 2021 11:07:41 -0400 Received: from muru.com ([72.249.23.125]:57170 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343837AbhERPHj (ORCPT ); Tue, 18 May 2021 11:07:39 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 7E07980F5; Tue, 18 May 2021 15:06:23 +0000 (UTC) From: Tony Lindgren To: Bin Liu , Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-omap@vger.kernel.org Subject: [PATCH] usb: musb: Check devctl status again for a spurious session request Date: Tue, 18 May 2021 18:06:15 +0300 Message-Id: <20210518150615.53464-1-tony@atomide.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org On start-up, we can get a spurious session request interrupt with nothing connected. After that the devctl session bit will silently clear, but the musb hardware is never idled until a cable is plugged in, or the glue layer module is reloaded. Let's just check the session bit again in 3 seconds in peripheral mode to catch the issue. Signed-off-by: Tony Lindgren --- drivers/usb/musb/musb_core.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -2055,6 +2055,15 @@ static void musb_pm_runtime_check_session(struct musb *musb) dev_err(musb->controller, "Could not enable: %i\n", error); musb->quirk_retries = 3; + + /* + * We can get a spurious MUSB_INTR_SESSREQ interrupt on start-up + * in B-peripheral mode with nothing connected and the session + * bit clears silently. Check status again in 3 seconds. + */ + if (devctl & MUSB_DEVCTL_BDEVICE) + schedule_delayed_work(&musb->irq_work, + msecs_to_jiffies(3000)); } else { musb_dbg(musb, "Allow PM with no session: %02x", devctl); pm_runtime_mark_last_busy(musb->controller);