From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751593AbdJ3Mmd (ORCPT ); Mon, 30 Oct 2017 08:42:33 -0400 Received: from bastet.se.axis.com ([195.60.68.11]:42914 "EHLO bastet.se.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751251AbdJ3Mmb (ORCPT ); Mon, 30 Oct 2017 08:42:31 -0400 From: Niklas Cassel To: Jingoo Han , Joao Pinto , Bjorn Helgaas Cc: Niklas Cassel , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 02/17] PCI: designware-ep: dw_pcie_ep_set_msi() should only set MMC bits Date: Mon, 30 Oct 2017 13:42:05 +0100 Message-Id: <20171030124221.20690-3-niklas.cassel@axis.com> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20171030124221.20690-1-niklas.cassel@axis.com> References: <20171030124221.20690-1-niklas.cassel@axis.com> X-TM-AS-GCONF: 00 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Previously, dw_pcie_ep_set_msi() wrote all bits in the Message Control register, thus overwriting the PCI_MSI_FLAGS_64BIT bit. By clearing the PCI_MSI_FLAGS_64BIT bit, we break MSI on systems where the RC has set a 64 bit MSI address. Signed-off-by: Niklas Cassel --- V2: * Clarified commit message. drivers/pci/dwc/pcie-designware-ep.c | 4 +++- drivers/pci/dwc/pcie-designware.h | 1 + 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c index d53d5f168363..c92ab87fd660 100644 --- a/drivers/pci/dwc/pcie-designware-ep.c +++ b/drivers/pci/dwc/pcie-designware-ep.c @@ -220,7 +220,9 @@ static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 encode_int) struct dw_pcie_ep *ep = epc_get_drvdata(epc); struct dw_pcie *pci = to_dw_pcie_from_ep(ep); - val = (encode_int << MSI_CAP_MMC_SHIFT); + val = dw_pcie_readw_dbi(pci, MSI_MESSAGE_CONTROL); + val &= ~MSI_CAP_MMC_MASK; + val |= (encode_int << MSI_CAP_MMC_SHIFT) & MSI_CAP_MMC_MASK; dw_pcie_writew_dbi(pci, MSI_MESSAGE_CONTROL, val); return 0; diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h index ecdede68522a..9aaf0cd04dd6 100644 --- a/drivers/pci/dwc/pcie-designware.h +++ b/drivers/pci/dwc/pcie-designware.h @@ -101,6 +101,7 @@ #define MSI_MESSAGE_CONTROL 0x52 #define MSI_CAP_MMC_SHIFT 1 +#define MSI_CAP_MMC_MASK (7 << MSI_CAP_MMC_SHIFT) #define MSI_CAP_MME_SHIFT 4 #define MSI_CAP_MME_MASK (7 << MSI_CAP_MME_SHIFT) #define MSI_MESSAGE_ADDR_L32 0x54 -- 2.14.2