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Mon, 2 Mar 2026 22:58:45 -0800 From: Manikanta Maddireddy To: , , , , , , , , , , , , , , , , , , <18255117159@163.com> CC: , , , Manikanta Maddireddy Subject: [PATCH v7 5/9] PCI: tegra194: Enable hardware hot reset mode in Endpoint Date: Tue, 3 Mar 2026 12:27:54 +0530 Message-ID: <20260303065758.2364340-6-mmaddireddy@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260303065758.2364340-1-mmaddireddy@nvidia.com> References: <20260303065758.2364340-1-mmaddireddy@nvidia.com> Precedence: bulk X-Mailing-List: linux-tegra@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: rnnvmail202.nvidia.com (10.129.68.7) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN2PEPF000044A5:EE_|BL4PR12MB9505:EE_ X-MS-Office365-Filtering-Correlation-Id: 1d01a00b-90a2-4401-80c2-08de78f25bb5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|376014|36860700013|7416014|921020; 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To enable this feature, program the APPL_CTRL register with hardware hot reset with immediate LTSSM enable mode. Reviewed-by: Jon Hunter Tested-by: Jon Hunter Signed-off-by: Vidya Sagar Signed-off-by: Manikanta Maddireddy --- Changes V1 -> V7: None drivers/pci/controller/dwc/pcie-tegra194.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c index 918e864b74a7..8f95910e99bc 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -1772,6 +1772,8 @@ static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie) val = appl_readl(pcie, APPL_CTRL); val |= APPL_CTRL_SYS_PRE_DET_STATE; val |= APPL_CTRL_HW_HOT_RST_EN; + val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK << APPL_CTRL_HW_HOT_RST_MODE_SHIFT); + val |= (APPL_CTRL_HW_HOT_RST_MODE_IMDT_RST_LTSSM_EN << APPL_CTRL_HW_HOT_RST_MODE_SHIFT); appl_writel(pcie, val, APPL_CTRL); val = appl_readl(pcie, APPL_CFG_MISC); -- 2.34.1