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AJvYcCU/h5gbH5lVcQI/AbXhTypilUjqi+1htb2WOdE3R/CliJVSNepMUtFx3U87ObRhyFLfWQchGsmtFxGi1yc=@vger.kernel.org X-Gm-Message-State: AOJu0Yz49SSqvKZrbrHtzzr67Zz1W62MfjNt7Tg+HGPH1e0U++YWiAPO TojVWDu1h00ZVcWLrZIQEDCXo+RDaEQ6W1cnYRX9lsWLPUyufFPQqAIwln+zU1t/nWx/Hd8xDCO XDOYA+SiZIUsjhA== X-Google-Smtp-Source: AGHT+IHcYTNQDnMOVwc6fZUnOUACET0zvNk3Da5TLzwhaqVFvPYd+NCLi84JDB/wEYzN4ScXaao6SLAgk0EZhb0= X-Received: from guanyulin.c.googlers.com ([fda3:e722:ac3:cc00:131:cd17:ac11:19c7]) (user=guanyulin job=sendgmr) by 2002:a5b:308:0:b0:e33:2432:8b75 with SMTP id 3f1490d57ef6-e3324328dedmr19783276.7.1730882145927; Wed, 06 Nov 2024 00:35:45 -0800 (PST) Date: Wed, 6 Nov 2024 08:32:59 +0000 In-Reply-To: <20241106083501.408074-1-guanyulin@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241106083501.408074-1-guanyulin@google.com> X-Mailer: git-send-email 2.47.0.199.ga7371fff76-goog Message-ID: <20241106083501.408074-6-guanyulin@google.com> Subject: [PATCH v6 5/5] usb: host: enable sideband transfer during system sleep From: Guan-Yu Lin To: gregkh@linuxfoundation.org, Thinh.Nguyen@synopsys.com, mathias.nyman@intel.com, stern@rowland.harvard.edu, sumit.garg@linaro.org, dianders@chromium.org, kekrby@gmail.com, oneukum@suse.com, yajun.deng@linux.dev, niko.mauno@vaisala.com, christophe.jaillet@wanadoo.fr, tj@kernel.org, stanley_chang@realtek.com, andreyknvl@gmail.com, quic_jjohnson@quicinc.com, ricardo@marliere.net Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Guan-Yu Lin Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Sharing a USB controller with another entity via xhci-sideband driver creates power management complexities. To prevent the USB controller from being inadvertently deactivated while in use by the other entity, a usage-count based mechanism is implemented. This allows the system to manage power effectively, ensuring the controller remains available whenever needed. Signed-off-by: Guan-Yu Lin --- drivers/usb/core/driver.c | 10 ++++++++++ drivers/usb/dwc3/core.c | 20 ++++++++++++++++++++ drivers/usb/dwc3/core.h | 1 + drivers/usb/host/xhci-plat.c | 10 ++++++++++ include/linux/usb/hcd.h | 7 +++++++ 5 files changed, 48 insertions(+) diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index e53cb4c267b3..e5bb26e6c71a 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -1583,6 +1583,11 @@ int usb_suspend(struct device *dev, pm_message_t msg) struct usb_device *udev =3D to_usb_device(dev); int r; =20 + if (msg.event =3D=3D PM_EVENT_SUSPEND && usb_sideband_check(udev)) { + dev_dbg(dev, "device accessed via sideband\n"); + return 0; + } + unbind_no_pm_drivers_interfaces(udev); =20 /* From now on we are sure all drivers support suspend/resume @@ -1619,6 +1624,11 @@ int usb_resume(struct device *dev, pm_message_t msg) struct usb_device *udev =3D to_usb_device(dev); int status; =20 + if (msg.event =3D=3D PM_EVENT_RESUME && usb_sideband_check(udev)) { + dev_dbg(dev, "device accessed via sideband\n"); + return 0; + } + /* For all calls, take the device back to full power and * tell the PM core in case it was autosuspended previously. * Unbind the interfaces that will need rebinding later, diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 2fdafbcbe44c..d85c68d5eba4 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -2550,8 +2550,18 @@ static int dwc3_runtime_idle(struct device *dev) static int dwc3_suspend(struct device *dev) { struct dwc3 *dwc =3D dev_get_drvdata(dev); + struct platform_device *xhci =3D dwc->xhci; + struct usb_hcd *hcd; int ret; =20 + if (xhci) { + hcd =3D dev_get_drvdata(&xhci->dev); + if (xhci_sideband_check(hcd)) { + dev_dbg(dev, "device accessed via sideband\n"); + return 0; + } + } + ret =3D dwc3_suspend_common(dwc, PMSG_SUSPEND); if (ret) return ret; @@ -2564,8 +2574,18 @@ static int dwc3_suspend(struct device *dev) static int dwc3_resume(struct device *dev) { struct dwc3 *dwc =3D dev_get_drvdata(dev); + struct platform_device *xhci =3D dwc->xhci; + struct usb_hcd *hcd; int ret; =20 + if (xhci) { + hcd =3D dev_get_drvdata(&xhci->dev); + if (xhci_sideband_check(hcd)) { + dev_dbg(dev, "device accessed via sideband\n"); + return 0; + } + } + pinctrl_pm_select_default_state(dev); =20 pm_runtime_disable(dev); diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 80047d0df179..a585e9d80e59 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -26,6 +26,7 @@ #include #include #include +#include #include #include =20 diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c index 6e49ef1908eb..5fdbdf0c7f1a 100644 --- a/drivers/usb/host/xhci-plat.c +++ b/drivers/usb/host/xhci-plat.c @@ -456,6 +456,11 @@ static int xhci_plat_suspend_common(struct device *dev= , struct pm_message pmsg) struct xhci_hcd *xhci =3D hcd_to_xhci(hcd); int ret; =20 + if (pmsg.event =3D=3D PM_EVENT_SUSPEND && xhci_sideband_check(hcd)) { + dev_dbg(dev, "device accessed via sideband\n"); + return 0; + } + if (pm_runtime_suspended(dev)) pm_runtime_resume(dev); =20 @@ -499,6 +504,11 @@ static int xhci_plat_resume_common(struct device *dev,= struct pm_message pmsg) struct xhci_hcd *xhci =3D hcd_to_xhci(hcd); int ret; =20 + if (pmsg.event =3D=3D PM_EVENT_RESUME && xhci_sideband_check(hcd)) { + dev_dbg(dev, "device accessed via sideband\n"); + return 0; + } + if (!device_may_wakeup(dev) && (xhci->quirks & XHCI_SUSPEND_RESUME_CLKS))= { ret =3D clk_prepare_enable(xhci->clk); if (ret) diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h index 9867c178d188..b22d25ccdf7c 100644 --- a/include/linux/usb/hcd.h +++ b/include/linux/usb/hcd.h @@ -772,6 +772,13 @@ extern struct rw_semaphore ehci_cf_port_reset_rwsem; #define USB_EHCI_LOADED 2 extern unsigned long usb_hcds_loaded; =20 +#if IS_ENABLED(CONFIG_USB_XHCI_SIDEBAND) +extern bool xhci_sideband_check(struct usb_hcd *hcd); +#else +static inline bool xhci_sideband_check(struct usb_hcd *hcd) +{ return false; } +#endif + #endif /* __KERNEL__ */ =20 #endif /* __USB_CORE_HCD_H */ --=20 2.47.0.199.ga7371fff76-goog