From 292560a839e5622bf2e071c1afe54bdb34209516 Mon Sep 17 00:00:00 2001 From: Peter Chen Date: Wed, 21 Jun 2017 14:42:05 +0800 Subject: [PATCH 11/14] usb: core: add power sequence handling for USB devices Some hard-wired USB devices need to do power sequence to let the device work normally, the typical power sequence like: enable USB PHY clock, toggle reset pin, etc. But current Linux USB driver lacks of such code to do it, it may cause some hard-wired USB devices works abnormal or can't be recognized by controller at all. In this patch, it calls power sequence library APIs to finish the power sequence events. It will do power on sequence at hub's probe for all devices under this hub (includes root hub). At hub_disconnect, it will do power off sequence which is at powered on list. Signed-off-by: Peter Chen Tested-by Joshua Clayton Tested-by: Maciej S. Szmigiero Reviewed-by: Vaibhav Hiremath Acked-by: Alan Stern --- drivers/usb/Kconfig | 1 + drivers/usb/core/hub.c | 49 +++++++++++++++++++++++++++++++++++++++++++++---- drivers/usb/core/hub.h | 1 + 3 files changed, 47 insertions(+), 4 deletions(-) diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig index f699abab1787..67316ba6a84c 100644 --- a/drivers/usb/Kconfig +++ b/drivers/usb/Kconfig @@ -39,6 +39,7 @@ config USB tristate "Support for Host-side USB" depends on USB_ARCH_HAS_HCD select USB_COMMON + select POWER_SEQUENCE select NLS # for UTF-8 strings ---help--- Universal Serial Bus (USB) is a specification for a serial bus diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index cf7bbcb9a63c..34f249f73757 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include @@ -1634,6 +1635,7 @@ static void hub_disconnect(struct usb_interface *intf) hub->error = 0; hub_quiesce(hub, HUB_DISCONNECT); + of_pwrseq_off_list(&hub->pwrseq_list); mutex_lock(&usb_port_peer_mutex); /* Avoid races with recursively_mark_NOTATTACHED() */ @@ -1680,11 +1682,41 @@ static bool hub_descriptor_is_sane(struct usb_host_interface *desc) return true; } +#ifdef CONFIG_OF +static int hub_of_pwrseq_on(struct usb_hub *hub) +{ + struct device *parent; + struct usb_device *hdev = hub->hdev; + struct device_node *np; + int ret; + + if (hdev->parent) + parent = &hdev->dev; + else + parent = bus_to_hcd(hdev->bus)->self.sysdev; + + for_each_child_of_node(parent->of_node, np) { + ret = of_pwrseq_on_list(np, &hub->pwrseq_list); + /* Maybe no power sequence library is chosen */ + if (ret && ret != -ENOENT) + return ret; + } + + return 0; +} +#else +static int hub_of_pwrseq_on(struct usb_hub *hub) +{ + return 0; +} +#endif + static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) { struct usb_host_interface *desc; struct usb_device *hdev; struct usb_hub *hub; + int ret = -ENODEV; desc = intf->cur_altsetting; hdev = interface_to_usbdev(intf); @@ -1775,6 +1807,7 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) INIT_DELAYED_WORK(&hub->leds, led_work); INIT_DELAYED_WORK(&hub->init_work, NULL); INIT_WORK(&hub->events, hub_event); + INIT_LIST_HEAD(&hub->pwrseq_list); usb_get_intf(intf); usb_get_dev(hdev); @@ -1788,11 +1821,14 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) hub->quirk_check_port_auto_suspend = 1; - if (hub_configure(hub, &desc->endpoint[0].desc) >= 0) - return 0; + if (hub_configure(hub, &desc->endpoint[0].desc) >= 0) { + ret = hub_of_pwrseq_on(hub); + if (!ret) + return 0; + } hub_disconnect(intf); - return -ENODEV; + return ret; } static int @@ -3606,14 +3642,19 @@ static int hub_suspend(struct usb_interface *intf, pm_message_t msg) /* stop hub_wq and related activity */ hub_quiesce(hub, HUB_SUSPEND); - return 0; + return pwrseq_suspend_list(&hub->pwrseq_list); } static int hub_resume(struct usb_interface *intf) { struct usb_hub *hub = usb_get_intfdata(intf); + int ret; dev_dbg(&intf->dev, "%s\n", __func__); + ret = pwrseq_resume_list(&hub->pwrseq_list); + if (ret) + return ret; + hub_activate(hub, HUB_RESUME); return 0; } diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h index 2a700ccc868c..3a0e6e6b22b0 100644 --- a/drivers/usb/core/hub.h +++ b/drivers/usb/core/hub.h @@ -70,6 +70,7 @@ struct usb_hub { struct delayed_work init_work; struct work_struct events; struct usb_port **ports; + struct list_head pwrseq_list; /* powered pwrseq node list */ }; /** -- 2.16.1