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=-3.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 03370C46471 for ; Mon, 6 Aug 2018 13:43:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BBA6421A38 for ; Mon, 6 Aug 2018 13:43:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BBA6421A38 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732523AbeHFPwl (ORCPT ); Mon, 6 Aug 2018 11:52:41 -0400 Received: from foss.arm.com ([217.140.101.70]:38924 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732329AbeHFPwk (ORCPT ); Mon, 6 Aug 2018 11:52:40 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E9CA97A9; Mon, 6 Aug 2018 06:43:30 -0700 (PDT) Received: from en101.Emea.Arm.com (en101.emea.arm.com [10.4.13.23]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id B90843F2EA; Mon, 6 Aug 2018 06:43:29 -0700 (PDT) From: Suzuki K Poulose To: linux-arm-kernel@lists.infradead.org Cc: mathieu.poirier@linaro.org, linux-kernel@vger.kernel.org, robert.walker@arm.com, mike.leach@arm.com, Suzuki K Poulose Subject: [PATCH 11/13] coresight: catu: Claim device before use Date: Mon, 6 Aug 2018 14:41:53 +0100 Message-Id: <1533562915-21558-12-git-send-email-suzuki.poulose@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1533562915-21558-1-git-send-email-suzuki.poulose@arm.com> References: <1533562915-21558-1-git-send-email-suzuki.poulose@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Use the CLAIM protocol to grab the ownership of the component when in use. Cc: Mathieu Poirier Signed-off-by: Suzuki K Poulose --- drivers/hwtracing/coresight/coresight-catu.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c index ff94e58..170fbb6 100644 --- a/drivers/hwtracing/coresight/coresight-catu.c +++ b/drivers/hwtracing/coresight/coresight-catu.c @@ -406,6 +406,7 @@ static inline int catu_wait_for_ready(struct catu_drvdata *drvdata) static int catu_enable_hw(struct catu_drvdata *drvdata, void *data) { + int rc; u32 control, mode; struct etr_buf *etr_buf = data; @@ -418,6 +419,10 @@ static int catu_enable_hw(struct catu_drvdata *drvdata, void *data) return -EBUSY; } + rc = coresight_claim_device_unlocked(drvdata->base); + if (rc) + return rc; + control |= BIT(CATU_CONTROL_ENABLE); if (etr_buf && etr_buf->mode == ETR_MODE_CATU) { @@ -459,6 +464,7 @@ static int catu_disable_hw(struct catu_drvdata *drvdata) int rc = 0; catu_write_control(drvdata, 0); + coresight_disclaim_device_unlocked(drvdata->base); if (catu_wait_for_ready(drvdata)) { dev_info(drvdata->dev, "Timeout while waiting for READY\n"); rc = -EAGAIN; -- 2.7.4