mirror of
https://github.com/archlinuxarm/PKGBUILDs.git
synced 2024-11-28 22:57:37 +00:00
164 lines
5 KiB
Diff
164 lines
5 KiB
Diff
From 3725bba0f1591b698482f4b144dc311199ef492b 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 10/13] 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 aa9968d90a48..14b93b844aaa 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 */
|
|
};
|
|
|
|
/**
|
|
--
|
|
2.17.0
|
|
|