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GET /api/1.1/patches/2230830/?format=api
{ "id": 2230830, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2230830/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20260430053050.3590173-1-ajay.neeli@amd.com/", "project": { "id": 35, "url": "http://patchwork.ozlabs.org/api/1.1/projects/35/?format=api", "name": "Linux I2C development", "link_name": "linux-i2c", "list_id": "linux-i2c.vger.kernel.org", "list_email": "linux-i2c@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20260430053050.3590173-1-ajay.neeli@amd.com>", "date": "2026-04-30T05:30:50", "name": "[v4] i2c: cadence: Add shutdown handler", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "7baad64204d6f5e54702aeace95cc4f23de38819", "submitter": { "id": 91036, "url": "http://patchwork.ozlabs.org/api/1.1/people/91036/?format=api", "name": "Ajay Neeli", "email": "ajay.neeli@amd.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20260430053050.3590173-1-ajay.neeli@amd.com/mbox/", "series": [ { "id": 502202, "url": "http://patchwork.ozlabs.org/api/1.1/series/502202/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/list/?series=502202", "date": "2026-04-30T05:30:50", "name": "[v4] i2c: cadence: Add shutdown handler", "version": 4, "mbox": "http://patchwork.ozlabs.org/series/502202/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2230830/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2230830/checks/", "tags": {}, "headers": { "Return-Path": "\n <linux-i2c+bounces-17202-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-i2c@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=amd.com header.i=@amd.com header.a=rsa-sha256\n header.s=selector1 header.b=O+ZV8co5;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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Add a\nshutdown handler that marks the adapter suspended and resets the\ncontroller, ensuring a clean handoff.\n\nSigned-off-by: Ajay Neeli <ajay.neeli@amd.com>\n---\nLink: https://lore.kernel.org/linux-i2c/20250730122907.18909-1-ajay.neeli@amd.com/\n\nChanges v3->v4:\n- Replaced disable_irq() with cdns_i2c_master_reset() to avoid\n potential deadlocks during shutdown\n- Added pm_runtime_status_suspended() check to skip register access\n when clocks are disabled\n\nChanges v2->v3:\nCorrected a typo that caused a build error in v2\n\nChanges in v1->v2:\nDisable interrupts\n---\n drivers/i2c/busses/i2c-cadence.c | 20 ++++++++++++++++++++\n 1 file changed, 20 insertions(+)", "diff": "diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c\nindex 0fb728ade92e..da8770182a18 100644\n--- a/drivers/i2c/busses/i2c-cadence.c\n+++ b/drivers/i2c/busses/i2c-cadence.c\n@@ -1635,6 +1635,25 @@ static void cdns_i2c_remove(struct platform_device *pdev)\n \treset_control_assert(id->reset);\n }\n \n+/**\n+ * cdns_i2c_shutdown - Prepare I2C controller for system shutdown\n+ * @pdev:\tHandle to the platform device structure\n+ *\n+ * Mark the adapter as suspended and reset the controller to ensure a clean\n+ * handoff during system reboot or kexec.\n+ */\n+static void cdns_i2c_shutdown(struct platform_device *pdev)\n+{\n+\tstruct cdns_i2c *id = platform_get_drvdata(pdev);\n+\n+\t/* Mark the adapter as suspended to prevent further I2C transfers */\n+\ti2c_mark_adapter_suspended(&id->adap);\n+\n+\t/* Reset the controller state if active - clocks are disabled when suspended */\n+\tif (!pm_runtime_status_suspended(&pdev->dev))\n+\t\tcdns_i2c_master_reset(&id->adap);\n+}\n+\n static struct platform_driver cdns_i2c_drv = {\n \t.driver = {\n \t\t.name = DRIVER_NAME,\n@@ -1643,6 +1662,7 @@ static struct platform_driver cdns_i2c_drv = {\n \t},\n \t.probe = cdns_i2c_probe,\n \t.remove = cdns_i2c_remove,\n+\t.shutdown = cdns_i2c_shutdown,\n };\n \n module_platform_driver(cdns_i2c_drv);\n", "prefixes": [ "v4" ] }