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Thu, 7 May 2026 08:46:18 -0700 From: Kartik Rajput To: , , , , , , , , , CC: Subject: [PATCH 1/4] clocksource/drivers/timer-tegra186: Fix support for multiple watchdog instances Date: Thu, 7 May 2026 21:15:54 +0530 Message-ID: <20260507154557.2082697-2-kkartik@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260507154557.2082697-1-kkartik@nvidia.com> References: <20260507154557.2082697-1-kkartik@nvidia.com> Precedence: bulk X-Mailing-List: linux-tegra@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF0001A0FB:EE_|PH7PR12MB7212:EE_ X-MS-Office365-Filtering-Correlation-Id: 090e7576-f8a9-47ed-1e6e-08deac4fdafe X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|376014|82310400026|1800799024|921020|18002099003|22082099003|56012099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: NrxJZxwTX0oHysKpoZnhdRPW9s33CXHk/kuO5IAHoOneuB4cv/mXgbFV1wft8q45IfC2nznrSWREf9m43QTkDbeJFQGFTVrjCGnRYbFkyo46VddbffoRUgaq5aW2jeVYSTKnayMrFpmlLJeiGJxasKdqK2eFkRcaDEIjt0vSR3uBVZh8/xZesE8fry0kkulNC7uYdO5KnmsguJpVyFqgg17oqzqYYkvqed60No6pefLQZ3Pn+DcuHRsWvU5P9pqG5v9lR4ridoKTkJieznTWwcp3xuFlBt6i7JWK57b+A3qEVT3faTCnPKoy+Y6Krp3/SyWXWuHOKydFOlV4JXxZaJkvSdnLz/Vd7Tl8tLR0vuwmtUGK/fvQJdneOmeuLiSx9o+rg+EQfO7xJ1nIQ4qNJb28Lkj6b7QCwOjN5WqTuSgwU1Saw56mTLOYEUlYyt6C X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 May 2026 15:46:50.7910 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 090e7576-f8a9-47ed-1e6e-08deac4fdafe X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF0001A0FB.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB7212 Tegra SoCs support multiple watchdogs; currently only one (WDT0) is used. When multiple watchdogs are registered, tegra186_wdt_enable() overwrites the TKEIE(x) register, discarding any existing watchdog interrupt enable bits. As a result, enabling one watchdog inadvertently disables interrupts for the others. Fix this by preserving the existing TKEIE(x) value and updating it using a read-modify-write sequence. Fixes: 42cee19a9f83 ("clocksource: Add Tegra186 timers support") Cc: stable@vger.kernel.org Signed-off-by: Kartik Rajput --- drivers/clocksource/timer-tegra186.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/clocksource/timer-tegra186.c b/drivers/clocksource/timer-tegra186.c index 355558893e5f..bfe16d2d5104 100644 --- a/drivers/clocksource/timer-tegra186.c +++ b/drivers/clocksource/timer-tegra186.c @@ -149,7 +149,8 @@ static void tegra186_wdt_enable(struct tegra186_wdt *wdt) u32 value; /* unmask hardware IRQ, this may have been lost across powergate */ - value = TKEIE_WDT_MASK(wdt->index, 1); + value = readl(tegra->regs + TKEIE(wdt->tmr->hwirq)); + value |= TKEIE_WDT_MASK(wdt->index, 1); writel(value, tegra->regs + TKEIE(wdt->tmr->hwirq)); /* clear interrupt */ -- 2.43.0