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=-13.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 2E179C433B4 for ; Sat, 10 Apr 2021 02:45:33 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 9EDEF6008E for ; Sat, 10 Apr 2021 02:45:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9EDEF6008E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:39672 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lV3cp-0000YH-Gl for qemu-devel@archiver.kernel.org; Fri, 09 Apr 2021 22:45:31 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43578) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lV3bU-00005X-8i for qemu-devel@nongnu.org; Fri, 09 Apr 2021 22:44:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:37570) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lV3bS-0007ib-JT for qemu-devel@nongnu.org; Fri, 09 Apr 2021 22:44:07 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 01E08610A2 for ; Sat, 10 Apr 2021 02:44:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618022644; bh=UvEHqi8mVEpcnBo/dQF8JEMP7dsNow4lpzWSAoxfSQA=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=Yu9rY69Bv06ouvBOPWP8YXjFPdiwqlnJ4WFPN3bcwg08jPkGBR6JviutqcsgJARfY I6iI+h4m3ejK0xRlkMV1ykZcHKkijXIF8HFeO8x8V3HB+ammqWOr1N3WEMqy/w9tvm WgKz7p0TXV1CvfVQ/IQ6unsrWQRGti0fgPxbGyBY18i3dEHPwq+BDCRIYGVIzqxNBU LRgZV5uhyivx14EbviciVHRTGFcIUTIm3AO+0kjhOIHTiLePUAe5nnXVkWP32zmCym OKGt70yn9EsgKt4GfzTztQjggcm/HaMq7RGWFbzQLV8i2iJp+Zm8tqIgHyGJxtJTfY H8UcRVP2btm3g== Received: by mail-io1-f52.google.com with SMTP id x17so7883110iog.2 for ; Fri, 09 Apr 2021 19:44:03 -0700 (PDT) X-Gm-Message-State: AOAM5306UvYRYHUPrHzQQxkXlhYfUwCgMk9DyuDmJYk1ACifSQai30ow 98y9HshZJwfsPPVSvBWe+7IAG/iBH6ARsiMYJjs= X-Google-Smtp-Source: ABdhPJzyxnuhqvI7usp6OOHEDah522OUHAVaha5HYtMDpTxnK2SfPUNnUvEBFBHGEHAcrrxjAALwPq063/YSgOQ+MsU= X-Received: by 2002:a05:6602:2be1:: with SMTP id d1mr13496094ioy.148.1618022643466; Fri, 09 Apr 2021 19:44:03 -0700 (PDT) MIME-Version: 1.0 References: <20210409093623.2402750-1-f4bug@amsat.org> <20210409093623.2402750-7-f4bug@amsat.org> In-Reply-To: <20210409093623.2402750-7-f4bug@amsat.org> From: Huacai Chen Date: Sat, 10 Apr 2021 10:43:52 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [RFC PATCH-for-6.1 v2 6/6] hw/mips/loongson3_virt: Raise CPU clock to 2 GHz To: =?UTF-8?Q?Philippe_Mathieu=2DDaud=C3=A9?= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=198.145.29.99; envelope-from=chenhuacai@kernel.org; helo=mail.kernel.org X-Spam_score_int: -70 X-Spam_score: -7.1 X-Spam_bar: ------- X-Spam_report: (-7.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Aleksandar Rikalo , Luc Michel , QEMU Developers , Hao Wu , Aurelien Jarno Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi, Philippe, On Fri, Apr 9, 2021 at 5:36 PM Philippe Mathieu-Daud=C3=A9 wrote: > > Commit cd3a53b727d ("clock: Add clock_ns_to_ticks() function") > removed the limitation of using clock with a frequency of 1 GHz > or more. > > The previous commit converted the MIPS CP0 timer to use this > new clock_ns_to_ticks() function. We can now use a clock of > 2 GHz with the Loongson3 virt board. Yes, we can do this, but why should we do this? I don't think this can bring any advantages. Huacai > > Signed-off-by: Philippe Mathieu-Daud=C3=A9 > --- > hw/mips/loongson3_virt.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/hw/mips/loongson3_virt.c b/hw/mips/loongson3_virt.c > index b15071defc6..0b72ef8a684 100644 > --- a/hw/mips/loongson3_virt.c > +++ b/hw/mips/loongson3_virt.c > @@ -152,7 +152,7 @@ static const MemoryRegionOps loongson3_pm_ops =3D { > } > }; > > -#define DEF_LOONGSON3_FREQ (800 * 1000 * 1000) > +#define DEF_LOONGSON3_FREQ (2000 * 1000 * 1000) > > static uint64_t get_cpu_freq_hz(void) > { > -- > 2.26.3 >