From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753795AbbJZLGe (ORCPT ); Mon, 26 Oct 2015 07:06:34 -0400 Received: from mx0a-0016f401.pphosted.com ([67.231.148.174]:14434 "EHLO mx0a-0016f401.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753617AbbJZLG2 (ORCPT ); Mon, 26 Oct 2015 07:06:28 -0400 From: Jisheng Zhang To: , , , , , , , CC: , , , , , Jisheng Zhang Subject: [RFC PATCH 2/3] PCI: tegra: generate proper configuration access cycles Date: Mon, 26 Oct 2015 19:02:13 +0800 Message-ID: <1445857334-6936-3-git-send-email-jszhang@marvell.com> X-Mailer: git-send-email 2.6.2 In-Reply-To: <1445857334-6936-1-git-send-email-jszhang@marvell.com> References: <1445857334-6936-1-git-send-email-jszhang@marvell.com> MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2015-10-26_09:,, signatures=0 X-Proofpoint-Spam-Details: rule=inbound_notspam policy=inbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1507310000 definitions=main-1510260190 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Inspired by Russell King's patch[1], I found current tegra also has the same issue of "reading 32-bits from the command register, modifying the command register, and then writing it back has the effect of clearing any status bits that were indicating at that time" as pointed out by Russell. This patch fix this issue by using the pci_generic_config_write. [1]http://www.spinics.net/lists/linux-pci/msg44869.html Signed-off-by: Jisheng Zhang --- drivers/pci/host/pci-tegra.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c index 81df0c1..d926e3e 100644 --- a/drivers/pci/host/pci-tegra.c +++ b/drivers/pci/host/pci-tegra.c @@ -483,7 +483,7 @@ static void __iomem *tegra_pcie_conf_address(struct pci_bus *bus, static struct pci_ops tegra_pcie_ops = { .map_bus = tegra_pcie_conf_address, .read = pci_generic_config_read32, - .write = pci_generic_config_write32, + .write = pci_generic_config_write, }; static unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port) -- 2.6.2