From: "Théo Lebrun" <theo.lebrun@bootlin.com> To: "Peter Chen" <peter.chen@kernel.org> Cc: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>, "Rob Herring" <robh+dt@kernel.org>, "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>, "Conor Dooley" <conor+dt@kernel.org>, "Roger Quadros" <rogerq@kernel.org>, "Pawel Laszczak" <pawell@cadence.com>, "Nishanth Menon" <nm@ti.com>, "Vignesh Raghavendra" <vigneshr@ti.com>, "Tero Kristo" <kristo@kernel.org>, <linux-usb@vger.kernel.org>, <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org> Subject: Re: [PATCH 4/6] usb: cdns3: support power-off of controller when in host role Date: Tue, 14 Nov 2023 12:10:18 +0100 [thread overview] Message-ID: <CWYHLRBFE1X1.15330WETL2R7U@tleb-bootlin-xps13-01> (raw) In-Reply-To: <20231114083838.GC64573@nchen-desktop> Hello, On Tue Nov 14, 2023 at 9:38 AM CET, Peter Chen wrote: > On 23-11-13 15:26:59, Théo Lebrun wrote: > > The controller is not being reconfigured at resume. Change resume to > > redo hardware config if quirk CDNS3_RESET_ON_RESUME is active. > > Current logic has power off judgement, see cdns3_controller_resume for > detail. Indeed! Thanks for the pointer. I had not noticed that, those patches come from an older kernel which didn't have it. That'll make for less changes; patches 4 & 5 can go away. > > + if (cdns->pdata && cdns->pdata->quirks & CDNS3_RESET_ON_RESUME) > > + cdns->xhci_plat_data->quirks |= XHCI_RESET_ON_RESUME | XHCI_SUSPEND_RESUME_CLKS; > > + > > If you set this flag, how could you support the USB remote wakeup > request? In that case, the USB bus does not expect re-enumeration. We didn't support remote USB wakeup. Only S2R mattered in our case and USB remote wakeup wasn't a possibility. > > +static int cdns_host_resume(struct cdns *cdns, bool hibernated) > > +{ > > + return cdns_drd_host_on(cdns); > > This one will redo if controller's power is off, please consider both > on and power situation. Clearly. Can see that at runtime. Thanks for the review! -- Théo Lebrun, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
WARNING: multiple messages have this Message-ID (diff)
From: "Théo Lebrun" <theo.lebrun@bootlin.com> To: "Peter Chen" <peter.chen@kernel.org> Cc: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>, "Rob Herring" <robh+dt@kernel.org>, "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>, "Conor Dooley" <conor+dt@kernel.org>, "Roger Quadros" <rogerq@kernel.org>, "Pawel Laszczak" <pawell@cadence.com>, "Nishanth Menon" <nm@ti.com>, "Vignesh Raghavendra" <vigneshr@ti.com>, "Tero Kristo" <kristo@kernel.org>, <linux-usb@vger.kernel.org>, <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org> Subject: Re: [PATCH 4/6] usb: cdns3: support power-off of controller when in host role Date: Tue, 14 Nov 2023 12:10:18 +0100 [thread overview] Message-ID: <CWYHLRBFE1X1.15330WETL2R7U@tleb-bootlin-xps13-01> (raw) In-Reply-To: <20231114083838.GC64573@nchen-desktop> Hello, On Tue Nov 14, 2023 at 9:38 AM CET, Peter Chen wrote: > On 23-11-13 15:26:59, Théo Lebrun wrote: > > The controller is not being reconfigured at resume. Change resume to > > redo hardware config if quirk CDNS3_RESET_ON_RESUME is active. > > Current logic has power off judgement, see cdns3_controller_resume for > detail. Indeed! Thanks for the pointer. I had not noticed that, those patches come from an older kernel which didn't have it. That'll make for less changes; patches 4 & 5 can go away. > > + if (cdns->pdata && cdns->pdata->quirks & CDNS3_RESET_ON_RESUME) > > + cdns->xhci_plat_data->quirks |= XHCI_RESET_ON_RESUME | XHCI_SUSPEND_RESUME_CLKS; > > + > > If you set this flag, how could you support the USB remote wakeup > request? In that case, the USB bus does not expect re-enumeration. We didn't support remote USB wakeup. Only S2R mattered in our case and USB remote wakeup wasn't a possibility. > > +static int cdns_host_resume(struct cdns *cdns, bool hibernated) > > +{ > > + return cdns_drd_host_on(cdns); > > This one will redo if controller's power is off, please consider both > on and power situation. Clearly. Can see that at runtime. Thanks for the review! -- Théo Lebrun, Bootlin Embedded Linux and Kernel engineering https://bootlin.com _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2023-11-14 11:10 UTC|newest] Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-11-13 14:26 [PATCH 0/6] usb: cdns: fix suspend on J7200 by assuming reset on resume Théo Lebrun 2023-11-13 14:26 ` Théo Lebrun 2023-11-13 14:26 ` [PATCH 1/6] dt-bindings: usb: ti,j721e-usb: add ti,j7200-usb compatible Théo Lebrun 2023-11-13 14:26 ` Théo Lebrun 2023-11-13 19:58 ` Conor Dooley 2023-11-13 19:58 ` Conor Dooley 2023-11-13 14:26 ` [PATCH 2/6] usb: cdns3-ti: move reg writes from probe into an init_hw helper Théo Lebrun 2023-11-13 14:26 ` Théo Lebrun 2023-11-15 11:33 ` Roger Quadros 2023-11-15 11:33 ` Roger Quadros 2023-11-15 14:23 ` Théo Lebrun 2023-11-15 14:23 ` Théo Lebrun 2023-11-16 12:00 ` Roger Quadros 2023-11-16 12:00 ` Roger Quadros 2023-11-13 14:26 ` [PATCH 3/6] usb: cdns3-ti: add suspend/resume procedures for J7200 Théo Lebrun 2023-11-13 14:26 ` Théo Lebrun 2023-11-13 15:39 ` Gregory CLEMENT 2023-11-13 15:39 ` Gregory CLEMENT 2023-11-14 11:13 ` Théo Lebrun 2023-11-14 11:13 ` Théo Lebrun 2023-11-15 11:37 ` Roger Quadros 2023-11-15 11:37 ` Roger Quadros 2023-11-15 15:02 ` Théo Lebrun 2023-11-15 15:02 ` Théo Lebrun 2023-11-16 12:40 ` Roger Quadros 2023-11-16 12:40 ` Roger Quadros 2023-11-16 18:56 ` Théo Lebrun 2023-11-16 18:56 ` Théo Lebrun 2023-11-16 21:44 ` Roger Quadros 2023-11-16 21:44 ` Roger Quadros 2023-11-17 10:17 ` Théo Lebrun 2023-11-17 10:17 ` Théo Lebrun 2023-11-17 11:51 ` Roger Quadros 2023-11-17 11:51 ` Roger Quadros 2023-11-17 14:20 ` Théo Lebrun 2023-11-17 14:20 ` Théo Lebrun 2023-11-18 10:41 ` Roger Quadros 2023-11-18 10:41 ` Roger Quadros 2023-11-22 22:23 ` Kevin Hilman 2023-11-22 22:23 ` Kevin Hilman 2023-11-23 9:51 ` Théo Lebrun 2023-11-23 9:51 ` Théo Lebrun 2023-11-26 22:36 ` Kevin Hilman 2023-11-26 22:36 ` Kevin Hilman 2023-11-27 13:25 ` Théo Lebrun 2023-11-27 13:25 ` Théo Lebrun 2023-12-12 18:26 ` Kevin Hilman 2023-12-12 18:26 ` Kevin Hilman 2023-12-12 19:31 ` Alan Stern 2023-12-12 19:31 ` Alan Stern 2023-11-13 14:26 ` [PATCH 4/6] usb: cdns3: support power-off of controller when in host role Théo Lebrun 2023-11-13 14:26 ` Théo Lebrun 2023-11-14 8:38 ` Peter Chen 2023-11-14 8:38 ` Peter Chen 2023-11-14 11:10 ` Théo Lebrun [this message] 2023-11-14 11:10 ` Théo Lebrun 2023-11-17 3:38 ` Peter Chen 2023-11-17 3:38 ` Peter Chen 2023-11-17 9:58 ` Théo Lebrun 2023-11-17 9:58 ` Théo Lebrun 2023-11-20 5:44 ` Peter Chen 2023-11-20 5:44 ` Peter Chen 2023-11-13 14:27 ` [PATCH 5/6] usb: cdns3-ti: notify cdns core that hardware resets across suspend on J7200 Théo Lebrun 2023-11-13 14:27 ` Théo Lebrun 2023-11-13 14:27 ` [PATCH 6/6] arm64: dts: ti: k3-j7200: use J7200-specific USB compatible Théo Lebrun 2023-11-13 14:27 ` Théo Lebrun 2023-11-14 10:01 ` Gregory CLEMENT 2023-11-14 10:01 ` Gregory CLEMENT 2023-11-14 11:14 ` Théo Lebrun 2023-11-14 11:14 ` Théo Lebrun
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