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=-8.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,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 F3A92C4321B for ; Mon, 10 Jun 2019 22:16:52 +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 C56782173B for ; Mon, 10 Jun 2019 22:16:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="Q6XrakSN" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C56782173B 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=YWNJCJn6pDzLO7ay7WztP1QL2mQZT2wNok72Ar+aVg0=; b=Q6XrakSNeNSzLO 6UQoSJ+xoJYrOYxKD0bbnze96yS9W7nw3Cmx9oPuRNxhJ3Er8TRqFfyOXoAg4Dtskqkwot67y5W50 GJFyPvNMSYml5oxPDzbVQS+eCIId07dAXBT+MoOSbQno88S5BV7AqGr3VS1FmzgTKrMLM+B6kme12 rijEmVgdEDZk4W3kjIS2ElqmvnBtRm9MaAMyfH+DRzTRZmzcPiJ5g/SpEEqrLnZyma/DMu4IyE6Hd NWn2F7xJwgH6a1SLvgclvqy9jynkCcSkRTJA/xQeZ2g1LhiUhHN0TvL6haKPshstNnv8y3ghqrYtk qoK3gvOcpfdTZ5C0VU/g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1haSax-0003VW-JZ; Mon, 10 Jun 2019 22:16:51 +0000 Received: from 089144193064.atnat0002.highway.a1.net ([89.144.193.64] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1haSat-0003Ll-PD; Mon, 10 Jun 2019 22:16:48 +0000 From: Christoph Hellwig To: Palmer Dabbelt Subject: [PATCH 09/17] riscv: improve the default power off implementation Date: Tue, 11 Jun 2019 00:16:13 +0200 Message-Id: <20190610221621.10938-10-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190610221621.10938-1-hch@lst.de> References: <20190610221621.10938-1-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: linux-mm@kvack.org, Damien Le Moal , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, uclinux-dev@uclinux.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 Only call the SBI code if we are not running in M mode, and if we didn't do the SBI call, or it didn't succeed call wfi in a loop to at least save some power. Signed-off-by: Christoph Hellwig --- arch/riscv/kernel/reset.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/riscv/kernel/reset.c b/arch/riscv/kernel/reset.c index cfb6eb1d762d..17c810985ad0 100644 --- a/arch/riscv/kernel/reset.c +++ b/arch/riscv/kernel/reset.c @@ -8,8 +8,11 @@ static void default_power_off(void) { +#ifndef CONFIG_M_MODE sbi_shutdown(); - while (1); +#endif + while (1) + wait_for_interrupt(); } void (*pm_power_off)(void) = default_power_off; -- 2.20.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv