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Miller" , Eric Dumazet , "Jakub Kicinski" , Paolo Abeni CC: , , "Mario Limonciello" , Sanath S , Basavaraj Natikar , Mika Westerberg Subject: [PATCH -next v2 3/3] thunderbolt: Add quirk to reset host interface for AMD USB4 routers Date: Mon, 5 Oct 2026 22:17:18 +0530 Message-ID: <20261005164718.4166200-4-Basavaraj.Natikar@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20261005164718.4166200-1-Basavaraj.Natikar@amd.com> References: <20261005164718.4166200-1-Basavaraj.Natikar@amd.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: satlexmb07.amd.com (10.181.42.216) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH01EPF000BE943:EE_|SJ0PR12MB6735:EE_ X-MS-Office365-Filtering-Correlation-Id: ad4c112f-9168-4cf6-75fe-08df23007281 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|82310400026|1800799024|36860700016|23010399003|376014|10067099003|11063799006|56012099006|22082099003|18002099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(7416014)(82310400026)(1800799024)(36860700016)(23010399003)(376014)(10067099003)(11063799006)(56012099006)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: dhbmsoCD/is2nmriVRgQPPLAS6MRuNm8TPukTznyD1mrI5NhJPPbZwZbcLKXCoYKXODpMncYHzEwe31sIU6REXzSpryfrzBXXqnRNSEUSagmZafW2ciNlvWoONJoCp3pOv4y7Oe6PNChc/+9PBNQtmB1ChGvHkEol7ZFtULzzv5cY4Knc8OghNsX4drKOf4fkKW22ErZxo2i8BeqblXl4UnXoRV+nbCDPYJ5tmnEZLvpoaYPnCg3TXaunc85T+BZvcjEJStQXR2lueUxjz8bsvJij37le0qo0/KX3R3j7msaP9ti0vunrjuxeTd8b6wnWJeX2CZvhSmawQ0lQnhLE6bn8u56s5iklLbtvSGZ0weTwcXy6STeZ36Gz6vxRxiTAxwgb5cs8fIQ2UcWt7sWjpxuIyR383+S63OBioVJ6IoqBKfnzzif+SFXToKkIlPe X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Oct 2026 16:48:13.7378 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ad4c112f-9168-4cf6-75fe-08df23007281 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH01EPF000BE943.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB6735 Affected AMD USB4 host routers hang a TX ring when a DMA HopID is programmed again after the DMA paths are torn down without an intervening host interface reset. Hence, set QUIRK_RESET_DMA_ON_REUSE for these routers so a used DMA HopID is not reprogrammed until the host interface has been reset. The reset waits for all DMA rings to stop, leaving unrelated active tunnels undisturbed. Suggested-by: Mika Westerberg Co-developed-by: Sanath S Signed-off-by: Sanath S Signed-off-by: Basavaraj Natikar --- drivers/thunderbolt/pci.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/thunderbolt/pci.c b/drivers/thunderbolt/pci.c index e40d4d6af071..b60b0d136821 100644 --- a/drivers/thunderbolt/pci.c +++ b/drivers/thunderbolt/pci.c @@ -77,11 +77,11 @@ static void nhi_pci_check_quirks(struct tb_nhi_pci *nhi_pci) case PCI_DEVICE_ID_AMD_1AH_M70H_NHI0: case PCI_DEVICE_ID_AMD_1AH_M70H_NHI1: /* - * These AMD hosts may hang the Tx ring when the - * DMA paths are torn down so they need the host - * interface reset after each teardown. + * These hosts may hang the Tx ring if its HopID is + * programmed again without a host interface reset + * in between. */ - nhi->quirks |= QUIRK_RESET_DMA_ON_TEARDOWN; + nhi->quirks |= QUIRK_RESET_DMA_ON_REUSE; break; } } -- 2.34.1