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From 5b874f0a1f92812bc797c01fa558f0ab4ed338ae Mon Sep 17 00:00:00 2001
From: Peter Chen <peter.chen@nxp.com>
Date: Wed, 21 Jun 2017 14:42:05 +0800
Subject: [PATCH 10/14] 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 <peter.chen@nxp.com>
Tested-by Joshua Clayton <stillcompiling@gmail.com>
Tested-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Reviewed-by: Vaibhav Hiremath <hvaibhav.linux@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
---
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 987fc5ba6321..bd09fc8ff763 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -45,6 +45,7 @@ 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 e3bf65e213cd..f6a739bbe754 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -28,6 +28,7 @@
#include <linux/mutex.h>
#include <linux/random.h>
#include <linux/pm_qos.h>
+#include <linux/power/pwrseq.h>
#include <linux/uaccess.h>
#include <asm/byteorder.h>
@@ -1654,6 +1655,7 @@ 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() */
@@ -1700,11 +1702,41 @@ 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);
@@ -1795,6 +1827,7 @@ 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);
@@ -1808,11 +1841,14 @@ 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
@@ -3633,14 +3669,19 @@ 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 4dc769ee9c74..b5d5c4818f90 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 */
};
/**
--
2.18.0
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