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Mon, 14 Oct 2024 01:58:56 -0700 (PDT) Date: Mon, 14 Oct 2024 08:50:29 +0000 In-Reply-To: <20241014085816.1401364-1-guanyulin@google.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241014085816.1401364-1-guanyulin@google.com> X-Mailer: git-send-email 2.47.0.rc1.288.g06298d1525-goog Message-ID: <20241014085816.1401364-6-guanyulin@google.com> Subject: [PATCH v5 5/5] usb: host: enable sideband transfer during system sleep From: Guan-Yu Lin To: Thinh.Nguyen@synopsys.com, gregkh@linuxfoundation.org, mathias.nyman@intel.com, stern@rowland.harvard.edu, yajun.deng@linux.dev, sumit.garg@linaro.org, kekrby@gmail.com, oneukum@suse.com, dianders@chromium.org, perex@perex.cz, tiwai@suse.com, niko.mauno@vaisala.com, andreyknvl@gmail.com, christophe.jaillet@wanadoo.fr, tj@kernel.org, stanley_chang@realtek.com, quic_jjohnson@quicinc.com, ricardo@marliere.net Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org, badhri@google.com, albertccwang@google.com, quic_wcheng@quicinc.com, pumahsu@google.com, Guan-Yu Lin 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/core/hcd.c | 1 + drivers/usb/core/usb.c | 1 + drivers/usb/dwc3/core.c | 13 +++++++++++++ drivers/usb/dwc3/core.h | 8 ++++++++ drivers/usb/host/xhci-plat.c | 10 ++++++++++ drivers/usb/host/xhci-plat.h | 7 +++++++ sound/usb/qcom/qc_audio_offload.c | 3 +++ 8 files changed, 53 insertions(+) diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index e713cf9b3dd2..eb85cbb1a2ff 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 = to_usb_device(dev); int r; + if (msg.event == PM_EVENT_SUSPEND && usb_sideband_check(udev)) { + dev_dbg(dev, "device accessed via sideband\n"); + return 0; + } + unbind_no_pm_drivers_interfaces(udev); /* 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 = to_usb_device(dev); int status; + if (msg.event == 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/core/hcd.c b/drivers/usb/core/hcd.c index 1ff7d901fede..9876b3940281 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -2593,6 +2593,7 @@ struct usb_hcd *__usb_create_hcd(const struct hc_driver *driver, timer_setup(&hcd->rh_timer, rh_timer_func, 0); #ifdef CONFIG_PM INIT_WORK(&hcd->wakeup_work, hcd_resume_work); + refcount_set(&hcd->sb_usage_count, 0); #endif INIT_WORK(&hcd->died_work, hcd_died_work); diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index 0b4685aad2d5..d315d066a56b 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -671,6 +671,7 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent, dev->state = USB_STATE_ATTACHED; dev->lpm_disable_count = 1; atomic_set(&dev->urbnum, 0); + refcount_set(&dev->sb_usage_count, 0); INIT_LIST_HEAD(&dev->ep0.urb_list); dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 2fdafbcbe44c..18c743ce5ac5 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -2550,8 +2550,15 @@ static int dwc3_runtime_idle(struct device *dev) static int dwc3_suspend(struct device *dev) { struct dwc3 *dwc = dev_get_drvdata(dev); + struct platform_device *xhci = dwc->xhci; int ret; + if (xhci && xhci_sideband_check(xhci->dev.driver_data)) { + dev_dbg(dev, "device accessed via sideband\n"); + return 0; + } + + ret = dwc3_suspend_common(dwc, PMSG_SUSPEND); if (ret) return ret; @@ -2564,8 +2571,14 @@ static int dwc3_suspend(struct device *dev) static int dwc3_resume(struct device *dev) { struct dwc3 *dwc = dev_get_drvdata(dev); + struct platform_device *xhci = dwc->xhci; int ret; + if (xhci && xhci_sideband_check(xhci->dev.driver_data)) { + dev_dbg(dev, "device accessed via sideband\n"); + return 0; + } + pinctrl_pm_select_default_state(dev); pm_runtime_disable(dev); diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 80047d0df179..e06d597ee3b0 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -26,6 +26,7 @@ #include #include #include +#include #include #include @@ -1704,4 +1705,11 @@ static inline void dwc3_ulpi_exit(struct dwc3 *dwc) { } #endif +#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 /* __DRIVERS_USB_DWC3_CORE_H */ 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 = hcd_to_xhci(hcd); int ret; + if (pmsg.event == 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); @@ -499,6 +504,11 @@ static int xhci_plat_resume_common(struct device *dev, struct pm_message pmsg) struct xhci_hcd *xhci = hcd_to_xhci(hcd); int ret; + if (pmsg.event == 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 = clk_prepare_enable(xhci->clk); if (ret) diff --git a/drivers/usb/host/xhci-plat.h b/drivers/usb/host/xhci-plat.h index 6475130eac4b..432a040c81e5 100644 --- a/drivers/usb/host/xhci-plat.h +++ b/drivers/usb/host/xhci-plat.h @@ -30,4 +30,11 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, void xhci_plat_remove(struct platform_device *dev); extern const struct dev_pm_ops xhci_plat_pm_ops; +#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 /* _XHCI_PLAT_H */ diff --git a/sound/usb/qcom/qc_audio_offload.c b/sound/usb/qcom/qc_audio_offload.c index 2dc651cd3d05..c82b5dbef2d7 100644 --- a/sound/usb/qcom/qc_audio_offload.c +++ b/sound/usb/qcom/qc_audio_offload.c @@ -1516,8 +1516,11 @@ static void handle_uaudio_stream_req(struct qmi_handle *handle, mutex_lock(&chip->mutex); subs->opened = 0; mutex_unlock(&chip->mutex); + } else { + xhci_sideband_get(uadev[pcm_card_num].sb); } } else { + xhci_sideband_put(uadev[pcm_card_num].sb); info = &uadev[pcm_card_num].info[info_idx]; if (info->data_ep_pipe) { ep = usb_pipe_endpoint(uadev[pcm_card_num].udev,