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Mon, 26 Sep 2022 04:51:27 -0700 From: Vidya Sagar To: , , , , , , , , , , CC: , , , , , , , Subject: [PATCH V2 7/9] PCI: tegra194: Disable direct speed change for EP Date: Mon, 26 Sep 2022 17:20:36 +0530 Message-ID: <20220926115038.24727-8-vidyas@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220926115038.24727-1-vidyas@nvidia.com> References: <20220926115038.24727-1-vidyas@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT096:EE_|PH7PR12MB5902:EE_ X-MS-Office365-Filtering-Correlation-Id: b6914b81-ed7d-431b-29cc-08da9fb579da X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230022)(4636009)(39860400002)(136003)(346002)(376002)(396003)(451199015)(36840700001)(40470700004)(46966006)(83380400001)(82740400003)(356005)(921005)(7636003)(110136005)(36860700001)(40460700003)(4326008)(70586007)(8676002)(70206006)(86362001)(316002)(54906003)(2906002)(5660300002)(8936002)(7416002)(41300700001)(47076005)(2616005)(36756003)(1076003)(426003)(336012)(186003)(7696005)(6666004)(40480700001)(26005)(82310400005)(478600001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Sep 2022 11:51:40.7021 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b6914b81-ed7d-431b-29cc-08da9fb579da X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT096.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB5902 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Disable direct speed change for endpoint to prevent it from doing speed change by itself post physical layer link up at gen1 and also to leave link speed in control of the host. Signed-off-by: Vidya Sagar --- V2: * None drivers/pci/controller/dwc/pcie-tegra194.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/contr= oller/dwc/pcie-tegra194.c index 702c55deb747..3e4868ab8416 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -1872,6 +1872,10 @@ static void pex_ep_event_pex_rst_deassert(struct teg= ra_pcie_dw *pcie) =20 reset_control_deassert(pcie->core_rst); =20 + val =3D dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL); + val &=3D ~PORT_LOGIC_SPEED_CHANGE; + dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val); + if (pcie->update_fc_fixup) { val =3D dw_pcie_readl_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF); val |=3D 0x1 << CFG_TIMER_CTRL_ACK_NAK_SHIFT; --=20 2.17.1