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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?o1enUBysKn6fmjLVgNDCwPiQds4RBpltv/Q3+EHHz+Y2trP4HwsMCOLTRRTr?= =?us-ascii?Q?DgbASaMl4KSozWKceSaUROK4NKbUhi0yiHJ+MsTB3pdCoZ0Ho5IXq6sWH/8f?= =?us-ascii?Q?RzC3IxyVn7aVou65MoCjheKEveFHy1WRZLGF/uHSTctEHjDEJPolJ8ZeCEAQ?= =?us-ascii?Q?NMeSUWsP06DgB6RDuNqOgMi0kXywPs62EAAjLjFzNZSwkIqRaOgfO4BwM+dQ?= =?us-ascii?Q?r24tTQRL9v9Tz/vzNH7rl8ScCM8bQ11K1+wHaSr3RaRVQCZGWMdriAnclcSP?= =?us-ascii?Q?M+FeKW4DEe+stO59wu2G+Kwja4dxJyN2Ilkanyw0rLZa5Ne0UwxirGF2zyFo?= =?us-ascii?Q?pWIp6zBnpLa9aa7pra4X77oW3XlqdmToCfbHTIJPHAaQQpkw45p9D+QL9z50?= =?us-ascii?Q?k+YkoZ12BUyyjXNs5ocB7pv81iiGzMgegLN5ndR6p/i41Wim7DAuYbA/Uloo?= =?us-ascii?Q?rjUrLGOYkjloA5YW6tT6mX7SDkG+M8B2WAmcO2luB48qP+kUz03WWVfIHf04?= =?us-ascii?Q?ydX4XHDG2IjuTJoJKOiLd+GRDcm7c4MKH9IB/tP3URRLsS31vJ3oN1s1g+Hb?= =?us-ascii?Q?EsY5nQiYi9Fpc405+WKcD4PhLuIc/3cLOMhbNsEi/KYGISnVhDPbecl5AfNJ?= =?us-ascii?Q?/mi+rw/6bbNffvXP6D5zHmZZB8u4G/QDd7nxNoh0VjgIGJKoaIYnbTyv4qdw?= =?us-ascii?Q?gdrtykoG7DIejBpz6Qwa6YMoR2sUuTLMFPJdtR+Cq+d+PIpgCCiZaEsyVT9s?= =?us-ascii?Q?V4O3/BeyDJQIbHv+/NttFr8YYPKtx71RhfycLxe07ooczu1e+tat2muP3gTb?= =?us-ascii?Q?LhNxHMqCzXyHSD0xCvojqNROscBxZhb7VGvRwMsXgBJrJCnD9GIxgv2+eeZm?= =?us-ascii?Q?wBCSM5lk/Xc+B/giSOcI5baTP4KjjmmqwhiQIlRErg/PEhtXdXtZl3b/w1QH?= =?us-ascii?Q?d36lycHVm7zriQe8P3SvZYldltK9+e7c8OeJMI2Cxj05RrTVq579myRsTOrZ?= =?us-ascii?Q?pBhjpMUOf1QhvCRDu+IgaEjVXJNgWqU6km5pHqsnbaaiRTsL1fUraEBpOS+g?= =?us-ascii?Q?Vo/N1HtOlgOHCsy+ypDgOi2tm6hmH9qUTYxCgJakWRhL3gOOnm/We7BmQuQP?= =?us-ascii?Q?JZioARLM4gbDNnP9SRCj5xXJzBsDQj8BxUpYd1E5fYhm0T8k89uWhU0+BVDm?= =?us-ascii?Q?bTqy8pALrEBymZYTA1dbVTsSMbkwNhgoEXCOK3YFzXc2+YKnBgvXrQto5UXG?= =?us-ascii?Q?gvjbhTIGnc3k5KKdYFh5FCAb7pbDTA0GoA+4X3I6DejvVJ9PBZegBrhro7sQ?= =?us-ascii?Q?5IaCfUhB1g/O2Q44CF7YjUQW/sdTDOB513uKcDWguJj2a27i2eHbMtKDcjOQ?= =?us-ascii?Q?dqLzhEOUucHBQ/72/E/ae4iJ9BdAdvrGBjv5hEzHAEvPhnlqpoGw5JMEQImw?= =?us-ascii?Q?CInIpeftUJQ5JjpsIOk4ALaKueVTD1L9hmWwxiMueXYbO14NEdMJT/83UaRK?= =?us-ascii?Q?NJuI7v4ITlQ2e1OeP4gNbMxfPZ+yk21iza37ZwpmBXkqDfEqqqNC9VYqwlt7?= =?us-ascii?Q?Mz4itBTntBgVeHMS9yaV5ksKhNGDhBjzn2aRWeQu?= X-OriginatorOrg: oss.nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 81e3e726-173c-42c6-c73d-08ddbd3b6028 X-MS-Exchange-CrossTenant-AuthSource: PAXPR04MB8459.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jul 2025 09:48:07.7170 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: XxmGqulY+o/Su4RLHHAvAxvKe3sDpwiUPcHC/AXADGl38rkTgd4kvXdqIbY5jv+bMHHsyPEW95i1CenL+paf7Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI2PR04MB10859 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250707_024821_274376_4B84B5D8 X-CRM114-Status: GOOD ( 11.14 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org +Ulf On Tue, Jul 01, 2025 at 03:16:08AM +0000, Carlos Song wrote: >Hi, All: > >We met the dead lock issue recently and think it should be common issue and not sure how to fix it. > >We use gpio-gate-clock clock provider (drivers/clk/clk-gpio.c), gpio is one of i2c gpio expander (drivers/gpio/gpio-pcf857x.c). Our i2c driver enable run time pm (drivers/i2c/busses/i2c-imx-lpi2c.c [1]). System random blocked when at reboot. > >The dead lock happen as below call stacks > >Task 117 Task 120 > >schedule() >clk_prepare_lock()--> wait prepare_lock(mutex_lock) schedule() wait for power.runtime_status exit RPM_SUSPENDING > ^^^^ A ^^^^ B >clk_bulk_unprepare() rpm_resume() >lpi2c_runtime_suspend() pm_runtime_resume_and_get() >... lpi2c_imx_xfer() > ... >rpm_suspend() set RPM_SUSPENDING pcf857x_set(); > ^^^^ B ... > clk_prepare_lock() --> hold prepare_lock > ^^^^ A > ... > This is a common issue that clk use a big prepare lock which is easy to trigger dead lock with runtime pm. I recalled that pengutronix raised this, but could not find the information. In this case, there are two clock providers that are independent. So I think using one global prepare lock does not make sense here. Stephen, I propose using a per provider prepare lock if the providers are totally independent. How do you think? Thanks, Peng