From patchwork Thu Feb 7 11:09:24 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kishon Vijay Abraham I X-Patchwork-Id: 10800911 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1DFBA6C2 for ; Thu, 7 Feb 2019 11:33:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0D3292C6EF for ; Thu, 7 Feb 2019 11:33:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F3F972C900; Thu, 7 Feb 2019 11:33:00 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6FB982C6EF for ; Thu, 7 Feb 2019 11:33:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726901AbfBGLcw (ORCPT ); Thu, 7 Feb 2019 06:32:52 -0500 Received: from fllv0015.ext.ti.com ([198.47.19.141]:53322 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726764AbfBGLcw (ORCPT ); Thu, 7 Feb 2019 06:32:52 -0500 Received: from fllv0034.itg.ti.com ([10.64.40.246]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id x17BWUmb094530; Thu, 7 Feb 2019 05:32:30 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1549539150; bh=zM9Td9IPdnQ4poiwQG4NpDYQ8HxesMv3eUNXS4tDPuQ=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=E/rOYfLNiwIP+378pFcSfLSZNuirUeWe1V18HqDNf8oBwvFCwK/raYcj84h2UYonf YrY9BBq2NjbLT0N9C+La+Ljim/ipVsCvd4PxpywBKtIVpcRwdtQFp5GkJOSpURgAol GAi6OCOgSDTHyKroCD5jz5QUuuSfTfXTUVu7OeMI= Received: from DFLE100.ent.ti.com (dfle100.ent.ti.com [10.64.6.21]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x17BWUdD073075 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 7 Feb 2019 05:32:30 -0600 Received: from DFLE113.ent.ti.com (10.64.6.34) by DFLE100.ent.ti.com (10.64.6.21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1591.10; Thu, 7 Feb 2019 05:32:30 -0600 Received: from dflp32.itg.ti.com (10.64.6.15) by DFLE113.ent.ti.com (10.64.6.34) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.1591.10 via Frontend Transport; Thu, 7 Feb 2019 05:32:30 -0600 Received: from a0393678ub.india.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp32.itg.ti.com (8.14.3/8.13.8) with ESMTP id x17BVxat026282; Thu, 7 Feb 2019 05:32:27 -0600 From: Kishon Vijay Abraham I To: Murali Karicheri , Lorenzo Pieralisi CC: Kishon Vijay Abraham I , Bjorn Helgaas , Jingoo Han , Gustavo Pimentel , , , Subject: [PATCH v2 9/9] PCI: dwc: Do not write to MSI control registers if the platform doesn't use it Date: Thu, 7 Feb 2019 16:39:24 +0530 Message-ID: <20190207110924.30716-10-kishon@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190207110924.30716-1-kishon@ti.com> References: <20190207110924.30716-1-kishon@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Platforms which populate msi_host_init, has it's own MSI controller logic. Writing to MSI control registers on platforms which doesn't use Designware's MSI controller logic might have side effects. To be safe, do not write to MSI control registers if the platform uses it's own MSI controller logic instead of Designware's MSI controller logic. Signed-off-by: Kishon Vijay Abraham I Acked-by: Gustavo Pimentel --- .../pci/controller/dwc/pcie-designware-host.c | 24 ++++++++++--------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index 9492b05e8ff0..d7184e1a7d92 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -647,17 +647,19 @@ void dw_pcie_setup_rc(struct pcie_port *pp) dw_pcie_setup(pci); - num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL; - - /* Initialize IRQ Status array */ - for (ctrl = 0; ctrl < num_ctrls; ctrl++) { - dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK + - (ctrl * MSI_REG_CTRL_BLOCK_SIZE), - 4, ~0); - dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + - (ctrl * MSI_REG_CTRL_BLOCK_SIZE), - 4, ~0); - pp->irq_status[ctrl] = 0; + if (!pp->ops->msi_host_init) { + num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL; + + /* Initialize IRQ Status array */ + for (ctrl = 0; ctrl < num_ctrls; ctrl++) { + dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK + + (ctrl * MSI_REG_CTRL_BLOCK_SIZE), + 4, ~0); + dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + + (ctrl * MSI_REG_CTRL_BLOCK_SIZE), + 4, ~0); + pp->irq_status[ctrl] = 0; + } } /* Setup RC BARs */