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Thu, 29 Jan 2026 20:42:53 +0000 Message-ID: <1db7b04b-ee65-4791-8db5-0dffc7befca2@intel.com> Date: Thu, 29 Jan 2026 22:42:32 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/7] i3c: master: Mark last_busy on IBI when runtime PM is allowed To: Frank Li CC: , , , References: <20260129181841.130864-1-adrian.hunter@intel.com> <20260129181841.130864-4-adrian.hunter@intel.com> Content-Language: en-US From: Adrian Hunter Organization: Intel Finland Oy, Registered Address: c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo, Business Identity Code: 0357606 - 4, Domiciled in Helsinki In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: DUZPR01CA0058.eurprd01.prod.exchangelabs.com (2603:10a6:10:469::12) To DS0PR11MB7215.namprd11.prod.outlook.com (2603:10b6:8:13a::13) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB7215:EE_|DM3PPF1721FD39C:EE_ X-MS-Office365-Filtering-Correlation-Id: cff641c6-69e2-4023-1d20-08de5f76f95a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014; 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In such cases, the runtime PM core may not see >> any recent activity and may suspend the device earlier than intended. >> >> Mark the controller as last busy whenever an IBI is queued (when >> rpm_ibi_allowed is set) so that the auto-suspend delay correctly reflects >> recent bus activity and avoids premature suspension. > > look like this can't resolve problem. pm_runtime_mark_last_busy() just > change dev->power.last_busy. If suspend before it, nothing happen. It should be effective. rpm_suspend() recalculates the autosuspend expiry time based on last_busy (see pm_runtime_autosuspend_expiration()) and restarts the timer is it is in the future. > > irq use thread irq, in irq thread call pm_runtime_resume() if needs. > > And this function call by irq handle, just put to work queue, what's impact > if do nothing here? Just premature runtime suspension inconsistent with autosuspend_delay. > > Frank > >> >> Signed-off-by: Adrian Hunter >> --- >> drivers/i3c/master.c | 5 +++++ >> 1 file changed, 5 insertions(+) >> >> diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c >> index bcc493dc9d04..dcc07ebc50a2 100644 >> --- a/drivers/i3c/master.c >> +++ b/drivers/i3c/master.c >> @@ -2721,9 +2721,14 @@ static void i3c_master_unregister_i3c_devs(struct i3c_master_controller *master) >> */ >> void i3c_master_queue_ibi(struct i3c_dev_desc *dev, struct i3c_ibi_slot *slot) >> { >> + struct i3c_master_controller *master = i3c_dev_get_master(dev); >> + >> if (!dev->ibi || !slot) >> return; >> >> + if (master->rpm_ibi_allowed) >> + pm_runtime_mark_last_busy(master->rpm_dev); >> + >> atomic_inc(&dev->ibi->pending_ibis); >> queue_work(dev->ibi->wq, &slot->work); >> } >> -- >> 2.51.0 >>