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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT 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 A0298C468C6 for ; Tue, 2 Mar 2021 05:08:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 81FE560249 for ; Tue, 2 Mar 2021 05:08:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1444553AbhCBCmk (ORCPT ); Mon, 1 Mar 2021 21:42:40 -0500 Received: from mail.kernel.org ([198.145.29.99]:60294 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238583AbhCAUAP (ORCPT ); Mon, 1 Mar 2021 15:00:15 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 18CA264ED7; Mon, 1 Mar 2021 17:56:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614621417; bh=6ePt3rwdDT108Ub4rc+l9h4ayQGocHfdHrRlTEPF/7I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DiNqKeNit3BD3Ybh9/vfofplsvGGuoWrPCzo+WgBA0C44E5xbNyYcMbhoDUM3oHwU oK8oSRwlYtFv74JZwr6PyzpYzZhe3Ar1EM0jzzENtc/r+193Xc+9l1c3NqJ9wXVHJn T356TLoo+b/P54PGR+pXmeqT410puJSF8vrp2gw0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pierre-Louis Bossart , Rander Wang , Bard Liao , Vinod Koul , Sasha Levin Subject: [PATCH 5.11 509/775] soundwire: bus: use sdw_update_no_pm when initializing a device Date: Mon, 1 Mar 2021 17:11:17 +0100 Message-Id: <20210301161226.668282991@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161201.679371205@linuxfoundation.org> References: <20210301161201.679371205@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Pierre-Louis Bossart [ Upstream commit b04c975e654cfdea6d691cd403b5a81cce7e593d ] When a Slave device is resumed, it may resume the bus and restart the enumeration. During that process, we absolutely don't want to call regular read/write routines which will wait for the resume to complete, otherwise a deadlock occurs. Fixes: 60ee9be25571 ('soundwire: bus: add PM/no-PM versions of read/write functions') Signed-off-by: Pierre-Louis Bossart Reviewed-by: Rander Wang Signed-off-by: Bard Liao Link: https://lore.kernel.org/r/20210122070634.12825-2-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/soundwire/bus.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index d1e8c3a54976b..60c42508c6c6b 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -489,6 +489,18 @@ sdw_read_no_pm(struct sdw_slave *slave, u32 addr) return buf; } +static int sdw_update_no_pm(struct sdw_slave *slave, u32 addr, u8 mask, u8 val) +{ + int tmp; + + tmp = sdw_read_no_pm(slave, addr); + if (tmp < 0) + return tmp; + + tmp = (tmp & ~mask) | val; + return sdw_write_no_pm(slave, addr, tmp); +} + /** * sdw_nread() - Read "n" contiguous SDW Slave registers * @slave: SDW Slave @@ -1256,7 +1268,7 @@ static int sdw_initialize_slave(struct sdw_slave *slave) val = slave->prop.scp_int1_mask; /* Enable SCP interrupts */ - ret = sdw_update(slave, SDW_SCP_INTMASK1, val, val); + ret = sdw_update_no_pm(slave, SDW_SCP_INTMASK1, val, val); if (ret < 0) { dev_err(slave->bus->dev, "SDW_SCP_INTMASK1 write failed:%d\n", ret); @@ -1271,7 +1283,7 @@ static int sdw_initialize_slave(struct sdw_slave *slave) val = prop->dp0_prop->imp_def_interrupts; val |= SDW_DP0_INT_PORT_READY | SDW_DP0_INT_BRA_FAILURE; - ret = sdw_update(slave, SDW_DP0_INTMASK, val, val); + ret = sdw_update_no_pm(slave, SDW_DP0_INTMASK, val, val); if (ret < 0) dev_err(slave->bus->dev, "SDW_DP0_INTMASK read failed:%d\n", ret); -- 2.27.0