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=-2.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 8463CC4360C for ; Mon, 30 Sep 2019 08:23:29 +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 467752086A for ; Mon, 30 Sep 2019 08:23:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="hXwnQij+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 467752086A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=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:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=cOIXAHuJVquMtlyZWVu5Hmk7yJ21MFzkL3PKlPj2U2w=; b=hXwnQij+OjtUCM JuvDAyf3xv9jPuHXlLeQbSPZ3mX6CIAVQfaiHz3+31KVujFN8n2qsIZbZLkozC1nNYDVmYi8/eLMC z4xg3DduMaGBSax7AcFZZbvayQ91TxeRlQta5bLg+RE4hYRQEbq/YBDPTyiJwLbWYb8xlVzpl60Su /2GxEkr+/EcBEJZPksdWXc5x8DWsfTk/RRJTKb/3cipSuRHEc9jV6IOurpwiLyai2e3U/k+OPC3MN xfJy/+MaaUENkNsl0ntjq2tbT6emGMLAf1u1Dr22vR58qCdwGN6ubSgCN0xmicW23dtmwyR6YAJxS GXWcs1RwKelEeOW2QKZQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1iEqxk-0001xf-Rf; Mon, 30 Sep 2019 08:23:20 +0000 Received: from hch by bombadil.infradead.org with local (Exim 4.92.2 #3 (Red Hat Linux)) id 1iEqvP-000835-Nr; Mon, 30 Sep 2019 08:20:55 +0000 Date: Mon, 30 Sep 2019 01:20:55 -0700 From: Christoph Hellwig To: Arnd Bergmann Subject: Re: [PATCH 00/11] of: dma-ranges fixes and improvements Message-ID: <20190930082055.GA21971@infradead.org> References: <20190927002455.13169-1-robh@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thierry Reding , Rob Herring , Florian Fainelli , Geert Uytterhoeven , Frank Rowand , DTML , linux-pci , "linux-kernel@vger.kernel.org" , Christoph Hellwig , Marek Vasut , Lorenzo Pieralisi , Oza Pawandeep , Linux ARM , Simon Horman , Robin Murphy , Nicolas Saenz Julienne , Stefan Wahren Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sun, Sep 29, 2019 at 01:16:20PM +0200, Arnd Bergmann wrote: > On a semi-related note, Thierry asked about one aspect of the dma-ranges > property recently, which is the behavior of dma_set_mask() and related > functions when a driver sets a mask that is larger than the memory > area in the bus-ranges but smaller than the available physical RAM. > As I understood Thierry's problem and the current code, the generic > dma_set_mask() will either reject the new mask entirely or override > the mask set by of_dma_configure, but it fails to set a correct mask > within the limitations of the parent bus in this case. There days dma_set_mask will only reject a mask if it is too small to be supported by the hardware. Larger than required masks are now always accepted. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel