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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 7DF5BC2D0CE for ; Sun, 29 Dec 2019 17:30:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 59AA220722 for ; Sun, 29 Dec 2019 17:30:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577640633; bh=QpltaeYl4GMIrtXvGy7EcFg673TxDOHFaguGPkry+O0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=tpyCrDe/Qld+cFqc5u+Q2Xngbl7AW6I7YjFtEMybAwhNIXzgfSf0z5zkQj3jy5qEK C4O7ABX+CTdZ9x9BDrD7X79Buxg3sdBXtMch/5rOKqD3Yeb7/5Sv/S++Ghq8IE5DC/ //BBKXIeKzRfVcdimYgsRB9EcSx0NMjbRbnL5KqU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728993AbfL2Rac (ORCPT ); Sun, 29 Dec 2019 12:30:32 -0500 Received: from mail.kernel.org ([198.145.29.99]:56586 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728967AbfL2Ra2 (ORCPT ); Sun, 29 Dec 2019 12:30:28 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 801D020722; Sun, 29 Dec 2019 17:30:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577640628; bh=QpltaeYl4GMIrtXvGy7EcFg673TxDOHFaguGPkry+O0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zyOy4wEsf2KgvwwJuG0wojle5rcdYUl3BuPa5jdNEsW6yyWz/I8igTxaR+S6RfVEL 6+RnbtbkeWP6oaD23JgXFSJj3Ptr6vlBQn1t93V3321J9/AQ6clJty/Wp25dOb7oPW IVINbge9DIE2uMg73CNw2v6JKjq/HOyHl0Fpyc9Y= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chanwoo Choi , Stephan Gerhold , Sasha Levin Subject: [PATCH 4.19 073/219] extcon: sm5502: Reset registers during initialization Date: Sun, 29 Dec 2019 18:17:55 +0100 Message-Id: <20191229162517.242288711@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20191229162508.458551679@linuxfoundation.org> References: <20191229162508.458551679@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Stephan Gerhold [ Upstream commit 6942635032cfd3e003e980d2dfa4e6323a3ce145 ] On some devices (e.g. Samsung Galaxy A5 (2015)), the bootloader seems to keep interrupts enabled for SM5502 when booting Linux. Changing the cable state (i.e. plugging in a cable) - until the driver is loaded - will therefore produce an interrupt that is never read. In this situation, the cable state will be stuck forever on the initial state because SM5502 stops sending interrupts. This can be avoided by clearing those pending interrupts after the driver has been loaded. One way to do this is to reset all registers to default state by writing to SM5502_REG_RESET. This ensures that we start from a clean state, with all interrupts disabled. Suggested-by: Chanwoo Choi Signed-off-by: Stephan Gerhold Signed-off-by: Chanwoo Choi Signed-off-by: Sasha Levin --- drivers/extcon/extcon-sm5502.c | 4 ++++ drivers/extcon/extcon-sm5502.h | 2 ++ 2 files changed, 6 insertions(+) diff --git a/drivers/extcon/extcon-sm5502.c b/drivers/extcon/extcon-sm5502.c index 0cfb5a3efdf6..2efcd94f74fc 100644 --- a/drivers/extcon/extcon-sm5502.c +++ b/drivers/extcon/extcon-sm5502.c @@ -69,6 +69,10 @@ struct sm5502_muic_info { /* Default value of SM5502 register to bring up MUIC device. */ static struct reg_data sm5502_reg_data[] = { { + .reg = SM5502_REG_RESET, + .val = SM5502_REG_RESET_MASK, + .invert = true, + }, { .reg = SM5502_REG_CONTROL, .val = SM5502_REG_CONTROL_MASK_INT_MASK, .invert = false, diff --git a/drivers/extcon/extcon-sm5502.h b/drivers/extcon/extcon-sm5502.h index 974b53222f56..12f8b01e5753 100644 --- a/drivers/extcon/extcon-sm5502.h +++ b/drivers/extcon/extcon-sm5502.h @@ -241,6 +241,8 @@ enum sm5502_reg { #define DM_DP_SWITCH_UART ((DM_DP_CON_SWITCH_UART <