From patchwork Wed Jul 27 07:14:13 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: hs.liao@mediatek.com X-Patchwork-Id: 9249349 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id DD41C607F0 for ; Wed, 27 Jul 2016 07:18:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C69C027AC2 for ; Wed, 27 Jul 2016 07:18:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BB5F227BF4; Wed, 27 Jul 2016 07:18:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 49E5627AC2 for ; Wed, 27 Jul 2016 07:18:51 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bSJ5r-0000T1-Mc; Wed, 27 Jul 2016 07:17:27 +0000 Received: from [210.61.82.183] (helo=mailgw01.mediatek.com) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bSJ5n-0000Ay-Ub; Wed, 27 Jul 2016 07:17:25 +0000 Received: from mtkhts07.mediatek.inc [(172.21.101.69)] by mailgw01.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 184902802; Wed, 27 Jul 2016 15:17:00 +0800 Received: from mtkslt205.mediatek.inc (10.21.15.75) by mtkhts07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.266.1; Wed, 27 Jul 2016 15:16:59 +0800 From: HS Liao To: Rob Herring , Matthias Brugger Subject: [PATCH v11 4/4] CMDQ: save more energy in idle Date: Wed, 27 Jul 2016 15:14:13 +0800 Message-ID: <1469603653-9733-5-git-send-email-hs.liao@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1469603653-9733-1-git-send-email-hs.liao@mediatek.com> References: <1469603653-9733-1-git-send-email-hs.liao@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160727_001724_321075_873DDC1F X-CRM114-Status: GOOD ( 15.62 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Kurtz , Monica Wang , Jiaguang Zhang , Nicolas Boichat , cawa cheng , HS Liao , Bibby Hsieh , YT Shen , Damon Chu , devicetree@vger.kernel.org, Sascha Hauer , Daoyuan Huang , Sascha Hauer , Glory Hung , CK HU , linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, srv_heupstream@mediatek.com, Josh-YC Liu , linux-kernel@vger.kernel.org, Dennis-YC Hsieh , Philipp Zabel Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Use clk_disable_unprepare instead of clk_disable to save more energy when CMDQ is idle. Signed-off-by: HS Liao --- drivers/soc/mediatek/mtk-cmdq.c | 55 +++++++++++++++++++++++++++++++++++------ 1 file changed, 47 insertions(+), 8 deletions(-) diff --git a/drivers/soc/mediatek/mtk-cmdq.c b/drivers/soc/mediatek/mtk-cmdq.c index ec384f9..155caf7 100644 --- a/drivers/soc/mediatek/mtk-cmdq.c +++ b/drivers/soc/mediatek/mtk-cmdq.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #define CMDQ_THR_MAX_COUNT 3 /* main, sub, general(misc) */ @@ -131,10 +132,16 @@ struct cmdq_task { struct cmdq_task_cb cb; }; +struct cmdq_clk_release { + struct cmdq *cmdq; + struct work_struct release_work; +}; + struct cmdq { struct mbox_controller mbox; void __iomem *base; u32 irq; + struct workqueue_struct *clk_release_wq; struct cmdq_thread thread[CMDQ_THR_MAX_COUNT]; struct mutex task_mutex; struct clk *clock; @@ -300,11 +307,19 @@ static void cmdq_thread_wait_end(struct cmdq_thread *thread, static void cmdq_task_exec(struct cmdq_task *task, struct cmdq_thread *thread) { struct cmdq *cmdq = task->cmdq; - unsigned long curr_pa, end_pa; + unsigned long curr_pa, end_pa, flags; task->thread = thread; if (list_empty(&thread->task_busy_list)) { - WARN_ON(clk_enable(cmdq->clock) < 0); + /* + * Unlock for clk prepare (sleeping function). + * We are safe to do that since we have task_mutex and + * only flush will add task. + */ + spin_unlock_irqrestore(&thread->chan->lock, flags); + WARN_ON(clk_prepare_enable(cmdq->clock) < 0); + spin_lock_irqsave(&thread->chan->lock, flags); + WARN_ON(cmdq_thread_reset(cmdq, thread) < 0); writel(task->pa_base, thread->base + CMDQ_THR_CURR_ADDR); @@ -386,6 +401,26 @@ static void cmdq_task_handle_error(struct cmdq_task *task) cmdq_thread_resume(thread); } +static void cmdq_clk_release_work(struct work_struct *work_item) +{ + struct cmdq_clk_release *clk_release = container_of(work_item, + struct cmdq_clk_release, release_work); + struct cmdq *cmdq = clk_release->cmdq; + + clk_disable_unprepare(cmdq->clock); + kfree(clk_release); +} + +static void cmdq_clk_release_schedule(struct cmdq *cmdq) +{ + struct cmdq_clk_release *clk_release; + + clk_release = kmalloc(sizeof(*clk_release), GFP_ATOMIC); + clk_release->cmdq = cmdq; + INIT_WORK(&clk_release->release_work, cmdq_clk_release_work); + queue_work(cmdq->clk_release_wq, &clk_release->release_work); +} + static void cmdq_thread_irq_handler(struct cmdq *cmdq, struct cmdq_thread *thread) { @@ -435,7 +470,7 @@ static void cmdq_thread_irq_handler(struct cmdq *cmdq, if (list_empty(&thread->task_busy_list)) { cmdq_thread_disable(cmdq, thread); - clk_disable(cmdq->clock); + cmdq_clk_release_schedule(cmdq); } else { mod_timer(&thread->timeout, jiffies + msecs_to_jiffies(CMDQ_TIMEOUT_MS)); @@ -494,7 +529,7 @@ static void cmdq_thread_handle_timeout(unsigned long data) cmdq_thread_resume(thread); cmdq_thread_disable(cmdq, thread); - clk_disable(cmdq->clock); + cmdq_clk_release_schedule(cmdq); spin_unlock_irqrestore(&thread->chan->lock, flags); } @@ -782,7 +817,7 @@ static int cmdq_suspend(struct device *dev) msleep(20); } - clk_unprepare(cmdq->clock); + flush_workqueue(cmdq->clk_release_wq); return 0; } @@ -790,7 +825,6 @@ static int cmdq_resume(struct device *dev) { struct cmdq *cmdq = dev_get_drvdata(dev); - WARN_ON(clk_prepare(cmdq->clock) < 0); cmdq->suspended = false; return 0; } @@ -799,8 +833,8 @@ static int cmdq_remove(struct platform_device *pdev) { struct cmdq *cmdq = platform_get_drvdata(pdev); + destroy_workqueue(cmdq->clk_release_wq); mbox_controller_unregister(&cmdq->mbox); - clk_unprepare(cmdq->clock); return 0; } @@ -918,8 +952,13 @@ static int cmdq_probe(struct platform_device *pdev) } mutex_init(&cmdq->task_mutex); + + cmdq->clk_release_wq = alloc_ordered_workqueue( + "%s", WQ_MEM_RECLAIM | WQ_HIGHPRI, + "cmdq_clk_release"); + platform_set_drvdata(pdev, cmdq); - WARN_ON(clk_prepare(cmdq->clock) < 0); + return 0; }