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Thu, 3 Aug 2023 11:00:13 -0500 Received: from DFLE101.ent.ti.com (10.64.6.22) by DFLE104.ent.ti.com (10.64.6.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23; Thu, 3 Aug 2023 11:00:12 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DFLE101.ent.ti.com (10.64.6.22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23 via Frontend Transport; Thu, 3 Aug 2023 11:00:12 -0500 Received: from [10.250.36.243] (ileaxei01-snat2.itg.ti.com [10.180.69.6]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 373G0B1W012107; Thu, 3 Aug 2023 11:00:11 -0500 Message-ID: <8c330bd9-5f4e-8cd0-ed02-c3a696d7473a@ti.com> Date: Thu, 3 Aug 2023 11:00:11 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [PATCH V6 4/4] firmware: ti_sci: Introduce system suspend resume support Content-Language: en-US To: Dhruva Gole CC: Nishanth Menon , Tero Kristo , "Santosh Shilimkar" , , , , Viresh Kumar , Praneeth Bajjuri , Tony Lindgren , Dave Gerlach , Vibhore Vardhan , Georgi Vlaev References: <20230803064247.503036-1-d-gole@ti.com> <20230803064247.503036-5-d-gole@ti.com> <3882f0ac-b74c-6eb2-197c-34ca233cd7a3@ti.com> <20230803155541.nwsfwobfkbpefoyw@dhruva> From: Andrew Davis In-Reply-To: <20230803155541.nwsfwobfkbpefoyw@dhruva> X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230803_090019_528897_8345CC2B X-CRM114-Status: GOOD ( 21.46 ) 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: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 8/3/23 10:55 AM, Dhruva Gole wrote: > On Aug 03, 2023 at 10:26:32 -0500, Andrew Davis wrote: >> On 8/3/23 1:42 AM, Dhruva Gole wrote: >>> Introduce system suspend resume calls that will allow the ti_sci >>> driver to support deep sleep low power mode when the user space issues a >>> suspend to mem. >>> >>> Also, write a ti_sci_prepare_system_suspend call to be used in the driver >>> suspend handler to allow the system to identify the low power mode being >>> entered and if necessary, send TISCI_MSG_PREPARE_SLEEP with information >>> about the mode is being entered and the address for allocated memory for >>> storing the context during Deep Sleep. >>> >>> We're using "pm_suspend_target_state" to map the kernel's target suspend >>> state to SysFW low power mode. Make sure this is available only when >>> CONFIG_SUSPEND is enabled. >>> >>> Co-developed-by: Dave Gerlach >>> Signed-off-by: Dave Gerlach >>> Signed-off-by: Vibhore Vardhan >>> Signed-off-by: Georgi Vlaev >>> Signed-off-by: Dhruva Gole >>> --- >>> drivers/firmware/ti_sci.c | 63 +++++++++++++++++++++++++++++++++++++++ >>> 1 file changed, 63 insertions(+) >>> > [..snip..] >>> +static int ti_sci_suspend(struct device *dev) >>> +{ >>> + struct ti_sci_info *info = dev_get_drvdata(dev); >>> + int ret; >>> + >>> + ret = ti_sci_cmd_set_io_isolation(&info->handle, TISCI_MSG_VALUE_IO_ENABLE); >> >> After this the will the IOs be in isolation? Or does the firmware wait >> until power down begins later? > > From what I understand, > IOs will be in isolation immediately > That is what I understand too, so then any device that may need to do some external communication for its suspend will not function, this must be the last driver _suspend() the system calls, how do you enforce that? Andrew >> >> Andrew >> >>> + if (ret) >>> + return ret; >>> + dev_dbg(dev, "%s: set I/O isolation: %d\n", __func__, ret); >>> + >>> + ret = ti_sci_prepare_system_suspend(info); >>> + if (ret) >>> + return ret; >>> + >>> + return 0; >>> +} >>> + >>> +static int ti_sci_resume(struct device *dev) >>> +{ >>> + struct ti_sci_info *info = dev_get_drvdata(dev); >>> + int ret; >>> + >>> + ret = ti_sci_cmd_set_io_isolation(&info->handle, TISCI_MSG_VALUE_IO_DISABLE); >>> + if (ret) >>> + return ret; >>> + dev_dbg(dev, "%s: disable I/O isolation: %d\n", __func__, ret); >>> + >>> + return 0; >>> +} >>> + >>> +static DEFINE_SIMPLE_DEV_PM_OPS(ti_sci_pm_ops, ti_sci_suspend, ti_sci_resume); >>> + >>> static int ti_sci_init_suspend(struct platform_device *pdev, >>> struct ti_sci_info *info) >>> { >>> @@ -3759,6 +3821,7 @@ static struct platform_driver ti_sci_driver = { >>> .driver = { >>> .name = "ti-sci", >>> .of_match_table = of_match_ptr(ti_sci_of_match), >>> + .pm = &ti_sci_pm_ops, >>> }, >>> }; >>> module_platform_driver(ti_sci_driver); > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel