From patchwork Tue Oct 25 15:33:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: ~axelheider X-Patchwork-Id: 13034866 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7E0B0C4332F for ; Mon, 7 Nov 2022 16:44:33 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1os5Cj-0002Dn-OC; Mon, 07 Nov 2022 11:42:33 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1os5CO-00025E-90; Mon, 07 Nov 2022 11:42:12 -0500 Received: from mail-b.sr.ht ([173.195.146.151]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1os5CI-0004nG-L4; Mon, 07 Nov 2022 11:42:10 -0500 Authentication-Results: mail-b.sr.ht; dkim=none Received: from git.sr.ht (unknown [173.195.146.142]) by mail-b.sr.ht (Postfix) with ESMTPSA id 5BDA211F0AA; Mon, 7 Nov 2022 16:42:04 +0000 (UTC) From: ~axelheider Date: Tue, 25 Oct 2022 17:33:43 +0200 Subject: [PATCH qemu.git v2 1/9] hw/timer/imx_epit: improve comments Message-ID: <166783932395.3279.1096141058484230644-1@git.sr.ht> X-Mailer: git.sr.ht In-Reply-To: <166783932395.3279.1096141058484230644-0@git.sr.ht> To: qemu-devel@nongnu.org Cc: peter.maydell@linaro.org, qemu-arm@nongnu.org MIME-Version: 1.0 Received-SPF: pass client-ip=173.195.146.151; envelope-from=outgoing@sr.ht; helo=mail-b.sr.ht X-Spam_score_int: 36 X-Spam_score: 3.6 X-Spam_bar: +++ X-Spam_report: (3.6 / 5.0 requ) BAYES_00=-1.9, DATE_IN_PAST_96_XX=3.405, FREEMAIL_FORGED_REPLYTO=2.095, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: ~axelheider Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Axel Heider Fix typos, add background information Signed-off-by: Axel Heider Reviewed-by: Peter Maydell --- hw/timer/imx_epit.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/hw/timer/imx_epit.c b/hw/timer/imx_epit.c index ec0fa440d7..4af730593f 100644 --- a/hw/timer/imx_epit.c +++ b/hw/timer/imx_epit.c @@ -100,9 +100,7 @@ static void imx_epit_reset(DeviceState *dev) { IMXEPITState *s = IMX_EPIT(dev); - /* - * Soft reset doesn't touch some bits; hard reset clears them - */ + /* Soft reset doesn't touch some bits; hard reset clears them */ s->cr &= (CR_EN|CR_ENMOD|CR_STOPEN|CR_DOZEN|CR_WAITEN|CR_DBGEN); s->sr = 0; s->lr = EPIT_TIMER_MAX; @@ -214,6 +212,7 @@ static void imx_epit_write(void *opaque, hwaddr offset, uint64_t value, ptimer_transaction_begin(s->timer_cmp); ptimer_transaction_begin(s->timer_reload); + /* Update the frequency. Has been done already in case of a reset. */ if (!(s->cr & CR_SWR)) { imx_epit_set_freq(s); } @@ -254,7 +253,7 @@ static void imx_epit_write(void *opaque, hwaddr offset, uint64_t value, break; case 1: /* SR - ACK*/ - /* writing 1 to OCIF clear the OCIF bit */ + /* writing 1 to OCIF clears the OCIF bit */ if (value & 0x01) { s->sr = 0; imx_epit_update_int(s); @@ -352,8 +351,18 @@ static void imx_epit_realize(DeviceState *dev, Error **errp) 0x00001000); sysbus_init_mmio(sbd, &s->iomem); + /* + * The reload timer keeps running when the peripheral is enabled. It is a + * kind of wall clock that does not generate any interrupts. The callback + * needs to be provided, but it does nothing as the ptimer already supports + * all necessary reloading functionality. + */ s->timer_reload = ptimer_init(imx_epit_reload, s, PTIMER_POLICY_LEGACY); + /* + * The compare timer is running only when the peripheral configuration is + * in a state that will generate compare interrupts. + */ s->timer_cmp = ptimer_init(imx_epit_cmp, s, PTIMER_POLICY_LEGACY); }