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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,URIBL_SBL,URIBL_SBL_A, USER_AGENT_GIT 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 2B3CACA9EC1 for ; Mon, 28 Oct 2019 12:11:01 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 E912B2086D for ; Mon, 28 Oct 2019 12:11:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="X9kidHOc" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E912B2086D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org 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=Q0qHsIYU591SHN0VpqrhAiJ/wbM9dcHqfd3VolXSrv8=; b=X9kidHOcohK+Sy GOwiZlGXGKa+9cVNZdCmoFiVdSilPfoSFGy4BH9xxFEUH372/l2CxOHEfN5nEn218LjVGgcASphAB N7HH/RhpTCV2EWGProHxUzA5AwrWsdWQMD23qNiwjTT9cqcyaI2+09VK7unkkuQDCrApxA4T8NQXU xp3pRZIHYdbUyc4riExixBo/xmeB3x4VnI8IeENoKi/Qr9kDUbqMTW9SrdcdCG9ETMrGEjIUE7L9y ZAx2cPJ5uk6ZXhgJ0HX9lpgqN5U/zrBHdbp6scBxeiS07TZzAmZuRyOfLvc3IF0dT0IpIsOcfiy0o SWQGFki/TpixaLJ+l8jA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iP3rP-0006ka-3j; Mon, 28 Oct 2019 12:10:59 +0000 Received: from [2001:4bb8:18c:c7d:c70:4a89:bc61:2] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1iP3rM-0006fc-Kp; Mon, 28 Oct 2019 12:10:57 +0000 From: Christoph Hellwig To: Palmer Dabbelt , Paul Walmsley Subject: [PATCH 04/12] riscv: cleanup the default power off implementation Date: Mon, 28 Oct 2019 13:10:35 +0100 Message-Id: <20191028121043.22934-5-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191028121043.22934-1-hch@lst.de> References: <20191028121043.22934-1-hch@lst.de> MIME-Version: 1.0 X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Anup Patel , Damien Le Moal , Atish Patra , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org Move the sbi poweroff to a separate function and file that is only compiled if CONFIG_SBI is set. Provide a new default fallback power off that just sits in a wfi loop to save some power. Signed-off-by: Christoph Hellwig Reviewed-by: Anup Patel Reviewed-by: Atish Patra --- arch/riscv/kernel/Makefile | 1 + arch/riscv/kernel/reset.c | 5 ++--- arch/riscv/kernel/sbi.c | 17 +++++++++++++++++ 3 files changed, 20 insertions(+), 3 deletions(-) create mode 100644 arch/riscv/kernel/sbi.c diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile index 696020ff72db..d8c35fa93cc6 100644 --- a/arch/riscv/kernel/Makefile +++ b/arch/riscv/kernel/Makefile @@ -41,5 +41,6 @@ obj-$(CONFIG_DYNAMIC_FTRACE) += mcount-dyn.o obj-$(CONFIG_PERF_EVENTS) += perf_event.o obj-$(CONFIG_PERF_EVENTS) += perf_callchain.o obj-$(CONFIG_HAVE_PERF_REGS) += perf_regs.o +obj-$(CONFIG_RISCV_SBI) += sbi.o clean: diff --git a/arch/riscv/kernel/reset.c b/arch/riscv/kernel/reset.c index d0fe623bfb8f..5e4e69859af1 100644 --- a/arch/riscv/kernel/reset.c +++ b/arch/riscv/kernel/reset.c @@ -4,12 +4,11 @@ */ #include -#include static void default_power_off(void) { - sbi_shutdown(); - while (1); + while (1) + wait_for_interrupt(); } void (*pm_power_off)(void) = default_power_off; diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c new file mode 100644 index 000000000000..f6c7c3e82d28 --- /dev/null +++ b/arch/riscv/kernel/sbi.c @@ -0,0 +1,17 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include +#include +#include + +static void sbi_power_off(void) +{ + sbi_shutdown(); +} + +static int __init sbi_init(void) +{ + pm_power_off = sbi_power_off; + return 0; +} +early_initcall(sbi_init); -- 2.20.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv