From patchwork Wed Jan 31 07:41:49 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ryder Lee X-Patchwork-Id: 10193393 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 5D84460383 for ; Wed, 31 Jan 2018 07:47:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4EB38284D2 for ; Wed, 31 Jan 2018 07:47:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 41F042850F; Wed, 31 Jan 2018 07:47:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, RCVD_IN_DNSWL_MED, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id F1D04284D2 for ; Wed, 31 Jan 2018 07:47:50 +0000 (UTC) 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: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:In-Reply-To:References: List-Owner; bh=rb+cSxIzyX5iWtUfmhWinklbF+F2nA1jPczR/86Firs=; b=rLd4s/AuSOM5Mi iakRY/3IpgsB9vCGQ3b8ECO1HR616k1Ts7u2IqkCKWqa1Tj5I9U3Ez4eTCFnjt/5qz3QrGUoOAwBb bLtzHo4rPzg4ExLFKIwPuDKnYoD1/9jY4OPxotNqpxsCb35IvJkLTk/u3D6X232GHo8Uw+RrOM2f1 rcd33omMaCWNaa9eumu6d/SNp7u9VJqVAh04/imWEhMSCmYulCap546rzjT+cd+S14DRXMLYXi6dv idjfwd2beQ8ldJ8+BzycBA9E2LqPl/syIHoGI4Sn36yy1b24sT8Uy84IBq4LIeEApIkOnXWoIte51 4b+/jYgMKq5jp0lDRyWw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.89 #1 (Red Hat Linux)) id 1egn7T-00020G-9m; Wed, 31 Jan 2018 07:47:47 +0000 Received: from [210.61.82.183] (helo=mailgw01.mediatek.com) by bombadil.infradead.org with esmtps (Exim 4.89 #1 (Red Hat Linux)) id 1egn79-0001iK-Gl; Wed, 31 Jan 2018 07:47:29 +0000 X-UUID: 6e48e148906044f4b47da58a6c8b851e-20180131 Received: from mtkexhb02.mediatek.inc [(172.21.101.103)] by mailgw01.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 1731833921; Wed, 31 Jan 2018 15:41:54 +0800 Received: from mtkcas09.mediatek.inc (172.21.101.178) by mtkmbs08n2.mediatek.inc (172.21.101.56) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Wed, 31 Jan 2018 15:41:53 +0800 Received: from mtkslt306.mediatek.inc (10.21.14.136) by mtkcas09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1210.3 via Frontend Transport; Wed, 31 Jan 2018 15:41:53 +0800 From: Ryder Lee To: Arnd Bergmann , Rob Herring , Bjorn Helgaas Subject: [PATCH 1/2] of_pci_irq: add a check to fallback to standard device tree parsing Date: Wed, 31 Jan 2018 15:41:49 +0800 Message-ID: <31c765c53e85e41bfc001d110d69e46c9967f4e7.1516961656.git.ryder.lee@mediatek.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 X-MTK: N X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Lorenzo Pieralisi , Benjamin Herrenschmidt , linux-kernel@vger.kernel.org, Ryder Lee , linux-mediatek@lists.infradead.org, linux-pci@vger.kernel.org, Frank Rowand , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP A root complex usually consist of a host bridge and multiple P2P bridges, and someone may express that in the form of a root node with many subnodes and list all four interrupts for each slot (child node) in the root node like this: pcie-controller { ... interrupt-map-mask = <0xf800 0 0 7>; interrupt-map = <0x0000 0 0 {INTx} &{interrupt parent} ...> 0x0800 0 0 {INTx} &{interrupt parent} ...>; pcie@0,0 { reg = <0x0000 0 0 0 0>; ... }; pcie@1,0 { reg = <0x0800 0 0 0 0>; ... }; }; As shown above, we'd like to propagate IRQs from a root port to the devices in the hierarchy below it in this way. However, it seems that the current parser couldn't handle such cases and will get something unexpected below: pcieport 0000:00:01.0: assign IRQ: got 213 igb 0000:01:00.0: assign IRQ: got 212 There is a device which is connected to 2nd slot, but the port doesn't share the same IRQ with its downstream devices. The problem here is that, if the loop found a P2P bridge, it wouldn't check whether the reg property exists in ppnode or not but just pass the subordinate devfn to of_irq_parse_raw(), thus the subsequent flow couldn't correctly resolve them. Fix this by adding a check to fallback to standard device tree parsing. Signed-off-by: Ryder Lee --- Please refer to the previous discussion thread: https://patchwork.ozlabs.org/patch/829108/ --- drivers/of/of_pci_irq.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/of/of_pci_irq.c b/drivers/of/of_pci_irq.c index 3a05568..e445866 100644 --- a/drivers/of/of_pci_irq.c +++ b/drivers/of/of_pci_irq.c @@ -86,8 +86,18 @@ int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq out_irq->np = ppnode; out_irq->args_count = 1; out_irq->args[0] = pin; - laddr[0] = cpu_to_be32((pdev->bus->number << 16) | (pdev->devfn << 8)); - laddr[1] = laddr[2] = cpu_to_be32(0); + + if (!dn && ppnode) { + const __be32 *addr; + + addr = of_get_property(ppnode, "reg", NULL); + if (addr) + memcpy(laddr, addr, 3); + } else { + laddr[0] = cpu_to_be32((pdev->bus->number << 16) | (pdev->devfn << 8)); + laddr[1] = laddr[2] = cpu_to_be32(0); + } + rc = of_irq_parse_raw(laddr, out_irq); if (rc) goto err;