From patchwork Mon Apr 15 15:08:50 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Belloni X-Patchwork-Id: 10901001 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 47CAF1390 for ; Mon, 15 Apr 2019 15:09:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2AFE42621B for ; Mon, 15 Apr 2019 15:09:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1EA9E27F9F; Mon, 15 Apr 2019 15:09:55 +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=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id BBF5C2621B for ; Mon, 15 Apr 2019 15:09:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=hL6sWaYr7Jat9as3u+qUucSJfSSTqOO97NywW/ic1LQ=; b=XYs7UzLAbFSM2U 1lZ08kjABsIlOVrYrSLby6bUymG4nqZtyFCHbh5LqL7GIQKXflGE1F2tbbSthueBIOA8nDVuxSrDo 42jHay7xBteL8gliIvCkCCbiX9OKEk1dwnSahSPOJK8+jJi3DuDF88JFdOuz7NNEks6IkWP/dPbYC +auga17sT0+wzHTv3aza8dJHRE+Ye9YqbglFOzptzTKFDNDZAY7pERH5qAv9BGfjg6VIzrQRqHVIq qEqY1o49QZt7MTA2b7d9RwauTuh7u9AvOdQMsw+zappMr9+dTqx5ZDTEPIpColS6R99+uoHx/mLvr rdGTP1w4U+ZCxPYj1WZQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hG3Ey-0002Qo-5X; Mon, 15 Apr 2019 15:09:48 +0000 Received: from relay6-d.mail.gandi.net ([217.70.183.198]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hG3EZ-0001pt-Az for linux-arm-kernel@lists.infradead.org; Mon, 15 Apr 2019 15:09:26 +0000 X-Originating-IP: 109.212.207.226 Received: from localhost (alyon-652-1-176-226.w109-212.abo.wanadoo.fr [109.212.207.226]) (Authenticated sender: alexandre.belloni@bootlin.com) by relay6-d.mail.gandi.net (Postfix) with ESMTPSA id F33E4C0006; Mon, 15 Apr 2019 15:09:13 +0000 (UTC) From: Alexandre Belloni To: Daniel Lezcano Subject: [PATCH v2 3/9] clocksource/drivers/tcb_clksrc: Use tcb as sched_clock Date: Mon, 15 Apr 2019 17:08:50 +0200 Message-Id: <20190415150856.9384-4-alexandre.belloni@bootlin.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190415150856.9384-1-alexandre.belloni@bootlin.com> References: <20190415150856.9384-1-alexandre.belloni@bootlin.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190415_080924_089847_A0D5A12E X-CRM114-Status: GOOD ( 13.28 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alexandre Belloni , Alexander Dahl , Sebastian Andrzej Siewior , linux-kernel@vger.kernel.org, Thomas Gleixner , linux-arm-kernel@lists.infradead.org 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 Now that the driver is registered early enough, use the TCB as the sched_clock which is much more accurate than the jiffies implementation. Signed-off-by: Alexandre Belloni --- drivers/clocksource/tcb_clksrc.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c index bf68504da94a..9de8c10ab546 100644 --- a/drivers/clocksource/tcb_clksrc.c +++ b/drivers/clocksource/tcb_clksrc.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include @@ -114,6 +115,16 @@ static struct clocksource clksrc = { .resume = tc_clksrc_resume, }; +static u64 notrace tc_sched_clock_read(void) +{ + return tc_get_cycles(&clksrc); +} + +static u64 notrace tc_sched_clock_read32(void) +{ + return tc_get_cycles32(&clksrc); +} + #ifdef CONFIG_GENERIC_CLOCKEVENTS struct tc_clkevt_device { @@ -335,6 +346,7 @@ static int __init tcb_clksrc_init(struct device_node *node) struct atmel_tc tc; struct clk *t0_clk; const struct of_device_id *match; + u64 (*tc_sched_clock)(void); u32 rate, divided_rate = 0; int best_divisor_idx = -1; int clk32k_divisor_idx = -1; @@ -419,6 +431,7 @@ static int __init tcb_clksrc_init(struct device_node *node) clksrc.read = tc_get_cycles32; /* setup ony channel 0 */ tcb_setup_single_chan(&tc, best_divisor_idx); + tc_sched_clock = tc_sched_clock_read32; } else { /* we have three clocks no matter what the * underlying platform supports. @@ -430,6 +443,7 @@ static int __init tcb_clksrc_init(struct device_node *node) } /* setup both channel 0 & 1 */ tcb_setup_dual_chan(&tc, best_divisor_idx); + tc_sched_clock = tc_sched_clock_read; } /* and away we go! */ @@ -442,6 +456,8 @@ static int __init tcb_clksrc_init(struct device_node *node) if (ret) goto err_unregister_clksrc; + sched_clock_register(tc_sched_clock, 32, divided_rate); + return 0; err_unregister_clksrc: