From patchwork Tue Nov 1 11:28:18 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: 9407219 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 7C8F160585 for ; Tue, 1 Nov 2016 11:31:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 52CCC28931 for ; Tue, 1 Nov 2016 11:31:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 46D9C297C5; Tue, 1 Nov 2016 11:31:44 +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 4735328931 for ; Tue, 1 Nov 2016 11:31:43 +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 1c1XGp-0001FD-3P; Tue, 01 Nov 2016 11:30:23 +0000 Received: from [210.61.82.184] (helo=mailgw02.mediatek.com) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1c1XGX-0008T0-Lo; Tue, 01 Nov 2016 11:30:08 +0000 Received: from mtkhts07.mediatek.inc [(172.21.101.69)] by mailgw02.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 163815570; Tue, 01 Nov 2016 19:29:41 +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; Tue, 1 Nov 2016 19:29:39 +0800 From: HS Liao To: Rob Herring , Matthias Brugger , Jassi Brar Subject: [PATCH v16 5/5] CMDQ: save energy Date: Tue, 1 Nov 2016 19:28:18 +0800 Message-ID: <1477999698-6288-6-git-send-email-hs.liao@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1477999698-6288-1-git-send-email-hs.liao@mediatek.com> References: <1477999698-6288-1-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-20161101_043006_300413_65744D80 X-CRM114-Status: GOOD ( 18.10 ) 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/mailbox/mtk-cmdq-mailbox.c | 52 ++++++++++++++++++++++++++++++++------ 1 file changed, 44 insertions(+), 8 deletions(-) diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c index 747bcd3..8771e57 100644 --- a/drivers/mailbox/mtk-cmdq-mailbox.c +++ b/drivers/mailbox/mtk-cmdq-mailbox.c @@ -22,6 +22,7 @@ #include #include #include +#include #define CMDQ_THR_MAX_COUNT 3 /* main, sub, general(misc) */ #define CMDQ_OP_CODE_MASK (0xff << CMDQ_OP_CODE_SHIFT) @@ -75,10 +76,16 @@ struct cmdq_task { struct cmdq_pkt *pkt; /* the packet sent from mailbox client */ }; +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 clk *clock; bool suspended; @@ -203,7 +210,7 @@ static void cmdq_task_exec(struct cmdq_pkt *pkt, struct cmdq_thread *thread) { struct cmdq *cmdq; struct cmdq_task *task; - unsigned long curr_pa, end_pa; + unsigned long curr_pa, end_pa, flags; cmdq = dev_get_drvdata(thread->chan->mbox->dev); @@ -219,7 +226,14 @@ static void cmdq_task_exec(struct cmdq_pkt *pkt, struct cmdq_thread *thread) task->pkt = pkt; if (list_empty(&thread->task_busy_list)) { - WARN_ON(clk_enable(cmdq->clock) < 0); + /* + * Unlock for clk prepare (sleeping function). + * This is safe since clk_prepare_enable has internal locks. + */ + 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); @@ -301,6 +315,26 @@ 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) { @@ -350,7 +384,7 @@ 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)); @@ -409,7 +443,7 @@ 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); } @@ -433,7 +467,7 @@ static int cmdq_suspend(struct device *dev) if (task_running) dev_warn(dev, "exist running task(s) in suspend\n"); - clk_unprepare(cmdq->clock); + flush_workqueue(cmdq->clk_release_wq); return 0; } @@ -441,7 +475,6 @@ 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; } @@ -450,8 +483,8 @@ 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; } @@ -567,8 +600,11 @@ static int cmdq_probe(struct platform_device *pdev) return err; } + 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; }