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Tue, 29 Jul 2025 08:43:30 +0000 Message-ID: <9eff9349-5115-471d-b3c5-c2684045ab79@intel.com> Date: Tue, 29 Jul 2025 14:13:23 +0530 User-Agent: Mozilla Thunderbird Subject: Re: Regression on linux-next (next-20250708) To: Damien Le Moal CC: "intel-gfx@lists.freedesktop.org" , "intel-xe@lists.freedesktop.org" , , , , "Kurmi, Suresh Kumar" , "Saarinen, Jani" , , "Deak, Imre" References: <07563042-6576-41cd-9a95-de83cfc95de1@intel.com> <5143bbee-697b-4357-9645-10f38296b561@kernel.org> Content-Language: en-GB From: "Borah, Chaitanya Kumar" In-Reply-To: <5143bbee-697b-4357-9645-10f38296b561@kernel.org> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MA5PR01CA0024.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a01:177::10) To SJ1PR11MB6129.namprd11.prod.outlook.com (2603:10b6:a03:488::12) Precedence: bulk X-Mailing-List: linux-ide@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PR11MB6129:EE_|BL1PR11MB6027:EE_ X-MS-Office365-Filtering-Correlation-Id: 36963ca8-bd0a-4b94-7d94-08ddce7bfe94 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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[5][6] >>>> >>>> IIUC, the above change is based on spec and not something which can be >>>> reverted. So as I see it, we have to drop this code path for external ports. >>>> However I am not sure if we can achieve deep power states without enforcing it >>>> through the sysfs entry. >>>> >>>> Atleast for the basic-rte subtest, the test passes if we comment out the >>>> functions controlling the SATA ports. We will need more testing to determine if >>>> this approach work. Any thoughts on it? >>>> >>>> Also, are there other ways to detect a port is external other than receiving >>>> EOPNOTSUPP on the sysfs write? >>> >>> The attached patch adds the "link_power_management_supported" sysfs device >>> attribute for drives connected to AHCI. Would that work for you ? >>> >> >> Yes this could work. I quickly hacked the test to ignore writing policy >> if this file returns 0. >> >> Here is the state of the machine I am testing on. >> >> /sys/class/scsi_host/host0/link_power_management_supported: 0 >> /sys/class/scsi_host/host1/link_power_management_supported: 0 >> /sys/class/scsi_host/host2/link_power_management_supported: 0 >> /sys/class/scsi_host/host3/link_power_management_supported: 0 >> /sys/class/scsi_host/host4/link_power_management_supported: 1 >> /sys/class/scsi_host/host5/link_power_management_supported: 1 >> /sys/class/scsi_host/host6/link_power_management_supported: 1 >> /sys/class/scsi_host/host7/link_power_management_supported: 1 > > Looks good. My test machine looks exactly like this too. > I will send out this patch as it is useful anyway regardless of external/hotplug > ports since not all adapters/drives support LPM. > > When posting this, can I tag it as a solution to the regression ? > Yes sure you can use it. Adding Imre to the conversation if he has anything to say about this change in our test. Regards Chaitanya > And in addition to this patch, I will work on a flexible way of ignoring hotplug. > >