From patchwork Wed Oct 23 21:45:46 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pierre-Louis Bossart X-Patchwork-Id: 11207785 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3F1D314E5 for ; Wed, 23 Oct 2019 21:49:42 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C54E921906 for ; Wed, 23 Oct 2019 21:49:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="NvY/aK7K" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C54E921906 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 0B079167E; Wed, 23 Oct 2019 23:48:50 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 0B079167E DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1571867380; bh=wk/O6FTcAxsh+9PEkVl0eRctnMJwPi9xDltLBLQSXOY=; h=From:To:Date:In-Reply-To:References:Cc:Subject:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=NvY/aK7K/IaoMLatEBtF/XPSI3FFA+vtxD6HB3WWZnokr7q6M6It2xJi2As+BmZzL fKY2Z3J5Ef8GUFQJvv23ol32bcuzgvbKqZAey1k6zQM8MJjnQe0YTxR/iSqF225OnU ByUsT4UiA3RivOrKdwbi6sWMLeUCDzCqtyDwL6kw= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 3FF75F80600; Wed, 23 Oct 2019 23:46:26 +0200 (CEST) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa1.perex.cz (Postfix, from userid 50401) id 88857F805FD; Wed, 23 Oct 2019 23:46:22 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on alsa1.perex.cz X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=SPF_HELO_NONE,SPF_NONE, SURBL_BLOCKED,URIBL_BLOCKED autolearn=disabled version=3.4.0 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 80E1CF80274 for ; Wed, 23 Oct 2019 23:46:19 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 80E1CF80274 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 23 Oct 2019 14:46:18 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.68,222,1569308400"; d="scan'208";a="196908138" Received: from ayamada-mobl1.gar.corp.intel.com (HELO pbossart-mobl3.intel.com) ([10.254.95.208]) by fmsmga008.fm.intel.com with ESMTP; 23 Oct 2019 14:46:16 -0700 From: Pierre-Louis Bossart To: alsa-devel@alsa-project.org Date: Wed, 23 Oct 2019 16:45:46 -0500 Message-Id: <20191023214601.883-4-pierre-louis.bossart@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191023214601.883-1-pierre-louis.bossart@linux.intel.com> References: <20191023214601.883-1-pierre-louis.bossart@linux.intel.com> MIME-Version: 1.0 Cc: Pierre-Louis Bossart , tiwai@suse.de, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, Ranjani Sridharan , vkoul@kernel.org, broonie@kernel.org, srinivas.kandagatla@linaro.org, jank@cadence.com, slawomir.blauciak@intel.com, Sanyog Kale , Bard liao , Rander Wang Subject: [alsa-devel] [PATCH 03/18] soundwire: bus: add PM/no-PM versions of read/write functions X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" Add support for pm_runtime with the appropriate error checks for sdw_write/read functions, e.g. when pm_runtime is not supported. Also expose internal functions without pm_runtime support, which are required to perform any sort of suspend/resume operation, as well as any enumeration tasks. Signed-off-by: Pierre-Louis Bossart --- drivers/soundwire/bus.c | 68 +++++++++++++++++++++++++++++++---------- 1 file changed, 52 insertions(+), 16 deletions(-) diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 903aee258800..7f431677f152 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -317,6 +317,46 @@ int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave, return 0; } +/* + * Read/Write IO functions. + * no_pm versions can only be called by the bus, e.g. while enumerating or + * handling suspend-resume sequences. + * all clients need to use the pm versions + */ + +static int +sdw_nread_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val) +{ + struct sdw_msg msg; + int ret; + + ret = sdw_fill_msg(&msg, slave, addr, count, + slave->dev_num, SDW_MSG_FLAG_READ, val); + if (ret < 0) + return ret; + + return sdw_transfer(slave->bus, &msg); +} + +static int +sdw_nwrite_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val) +{ + struct sdw_msg msg; + int ret; + + ret = sdw_fill_msg(&msg, slave, addr, count, + slave->dev_num, SDW_MSG_FLAG_WRITE, val); + if (ret < 0) + return ret; + + return sdw_transfer(slave->bus, &msg); +} + +int sdw_write_no_pm(struct sdw_slave *slave, u32 addr, u8 value) +{ + return sdw_nwrite_no_pm(slave, addr, 1, &value); +} + /** * sdw_nread() - Read "n" contiguous SDW Slave registers * @slave: SDW Slave @@ -326,19 +366,17 @@ int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave, */ int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val) { - struct sdw_msg msg; int ret; - ret = sdw_fill_msg(&msg, slave, addr, count, - slave->dev_num, SDW_MSG_FLAG_READ, val); - if (ret < 0) - return ret; - ret = pm_runtime_get_sync(slave->bus->dev); - if (ret < 0) + if (ret < 0 && ret != -EACCES) { + pm_runtime_put_noidle(slave->bus->dev); return ret; + } + + ret = sdw_nread_no_pm(slave, addr, count, val); - ret = sdw_transfer(slave->bus, &msg); + pm_runtime_mark_last_busy(slave->bus->dev); pm_runtime_put(slave->bus->dev); return ret; @@ -354,19 +392,17 @@ EXPORT_SYMBOL(sdw_nread); */ int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, u8 *val) { - struct sdw_msg msg; int ret; - ret = sdw_fill_msg(&msg, slave, addr, count, - slave->dev_num, SDW_MSG_FLAG_WRITE, val); - if (ret < 0) - return ret; - ret = pm_runtime_get_sync(slave->bus->dev); - if (ret < 0) + if (ret < 0 && ret != -EACCES) { + pm_runtime_put_noidle(slave->bus->dev); return ret; + } + + ret = sdw_nwrite_no_pm(slave, addr, count, val); - ret = sdw_transfer(slave->bus, &msg); + pm_runtime_mark_last_busy(slave->bus->dev); pm_runtime_put(slave->bus->dev); return ret;