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=-8.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 6848DC48BE8 for ; Mon, 24 Jun 2019 05:43:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 362A82168B for ; Mon, 24 Jun 2019 05:43:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="bOJanL5M" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727431AbfFXFnu (ORCPT ); Mon, 24 Jun 2019 01:43:50 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:36406 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726223AbfFXFnp (ORCPT ); Mon, 24 Jun 2019 01:43:45 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=5S44G7hi9/oDzUjI/c4UDpw03IJ9UksvFQEQlTe28Is=; b=bOJanL5MMnc/t7xSRwNl23fs0K aeNomPXq+bdVmfGjm7QRaFm9ieHxtd8szKCB8LzF3VBt+56T9bWIcSx3l2sZ3yrFCt8hsBXSUggZ+ +1vAATxtqrhDYJxKiEsAQfkE+e61DJiYbUXXQTpvfNkDBQWEsG+N6s77wOacZ+peImRSnwjUjAtDn OCXkGgA4IVqSHPmT7He01n2msBaxwwg7D79sLkzAgVdMIqYmqCXIl9UKMggE7wL7HO5tpiBlBM7hq Ogdeuv7YAqIa7B4iM21XQMBymT3miTYC6nVRevqkNpks/Yd7ZnY34qKnata1FuJIiiypv/Q4OyDxk pfsmhyLg==; Received: from 213-225-6-159.nat.highway.a1.net ([213.225.6.159] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hfHlW-0006Ra-NN; Mon, 24 Jun 2019 05:43:43 +0000 From: Christoph Hellwig To: Palmer Dabbelt , Paul Walmsley Cc: Damien Le Moal , linux-riscv@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 08/17] riscv: improve the default power off implementation Date: Mon, 24 Jun 2019 07:43:02 +0200 Message-Id: <20190624054311.30256-9-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190624054311.30256-1-hch@lst.de> References: <20190624054311.30256-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.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 d0fe623bfb8f..2f5ca379747e 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