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Thu, 3 Aug 2023 10:55:43 -0500 Received: from DLEE112.ent.ti.com (157.170.170.23) by DLEE109.ent.ti.com (157.170.170.41) 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 10:55:42 -0500 Received: from lelv0327.itg.ti.com (10.180.67.183) by DLEE112.ent.ti.com (157.170.170.23) 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 10:55:42 -0500 Received: from localhost (ileaxei01-snat.itg.ti.com [10.180.69.5]) by lelv0327.itg.ti.com (8.15.2/8.15.2) with ESMTP id 373FtgL6010324; Thu, 3 Aug 2023 10:55:42 -0500 Date: Thu, 3 Aug 2023 21:25:41 +0530 From: Dhruva Gole To: Andrew Davis CC: Nishanth Menon , Tero Kristo , "Santosh Shilimkar" , , , , Viresh Kumar , Praneeth Bajjuri , Tony Lindgren , Dave Gerlach , Vibhore Vardhan , Georgi Vlaev Subject: Re: [PATCH V6 4/4] firmware: ti_sci: Introduce system suspend resume support Message-ID: <20230803155541.nwsfwobfkbpefoyw@dhruva> References: <20230803064247.503036-1-d-gole@ti.com> <20230803064247.503036-5-d-gole@ti.com> <3882f0ac-b74c-6eb2-197c-34ca233cd7a3@ti.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <3882f0ac-b74c-6eb2-197c-34ca233cd7a3@ti.com> 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_085550_434694_B1C041D5 X-CRM114-Status: GOOD ( 27.02 ) 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-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 > > 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); -- Best regards, Dhruva Gole _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel