u-boot/common/usb_hub.c

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/*
* Most of this source has been derived from the Linux USB
* project:
* (C) Copyright Linus Torvalds 1999
* (C) Copyright Johannes Erdfelt 1999-2001
* (C) Copyright Andreas Gal 1999
* (C) Copyright Gregory P. Smith 1999
* (C) Copyright Deti Fliegl 1999 (new USB architecture)
* (C) Copyright Randy Dunlap 2000
* (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
* (C) Copyright Yggdrasil Computing, Inc. 2000
* (usb_device_id matching changes by Adam J. Richter)
*
* Adapted for U-Boot:
* (C) Copyright 2001 Denis Peter, MPL AG Switzerland
*
* SPDX-License-Identifier: GPL-2.0+
*/
/****************************************************************************
* HUB "Driver"
* Probes device for being a hub and configurate it
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <errno.h>
#include <memalign.h>
#include <asm/processor.h>
#include <asm/unaligned.h>
#include <linux/ctype.h>
usb: Change power-on / scanning timeout handling This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
2016-03-15 12:59:15 +00:00
#include <linux/list.h>
#include <asm/byteorder.h>
#ifdef CONFIG_SANDBOX
#include <asm/state.h>
#endif
#include <asm/unaligned.h>
DECLARE_GLOBAL_DATA_PTR;
#include <usb.h>
#define USB_BUFSIZ 512
#define HUB_SHORT_RESET_TIME 20
#define HUB_LONG_RESET_TIME 200
usb: Change power-on / scanning timeout handling This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
2016-03-15 12:59:15 +00:00
#define PORT_OVERCURRENT_MAX_SCAN_COUNT 3
struct usb_device_scan {
struct usb_device *dev; /* USB hub device to scan */
struct usb_hub_device *hub; /* USB hub struct */
int port; /* USB port to scan */
struct list_head list;
};
static LIST_HEAD(usb_scan_list);
__weak void usb_hub_reset_devices(int port)
{
return;
}
static inline bool usb_hub_is_superspeed(struct usb_device *hdev)
{
return hdev->descriptor.bDeviceProtocol == 3;
}
#ifdef CONFIG_DM_USB
bool usb_hub_is_root_hub(struct udevice *hub)
{
if (device_get_uclass_id(hub->parent) != UCLASS_USB_HUB)
return true;
return false;
}
static int usb_set_hub_depth(struct usb_device *dev, int depth)
{
if (depth < 0 || depth > 4)
return -EINVAL;
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_SET_HUB_DEPTH, USB_DIR_OUT | USB_RT_HUB,
depth, 0, NULL, 0, USB_CNTL_TIMEOUT);
}
#endif
static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
{
unsigned short dtype = USB_DT_HUB;
if (usb_hub_is_superspeed(dev))
dtype = USB_DT_SS_HUB;
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
dtype << 8, 0, data, size, USB_CNTL_TIMEOUT);
}
static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
{
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
port, NULL, 0, USB_CNTL_TIMEOUT);
}
static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
{
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
port, NULL, 0, USB_CNTL_TIMEOUT);
}
static int usb_get_hub_status(struct usb_device *dev, void *data)
{
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
}
int usb_get_port_status(struct usb_device *dev, int port, void *data)
{
int ret;
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
data, sizeof(struct usb_port_status), USB_CNTL_TIMEOUT);
#ifdef CONFIG_DM_USB
if (ret < 0)
return ret;
/*
* Translate the USB 3.0 hub port status field into the old version
* that U-Boot understands. Do this only when the hub is not root hub.
* For root hub, the port status field has already been translated
* in the host controller driver (see xhci_submit_root() in xhci.c).
*
* Note: this only supports driver model.
*/
if (!usb_hub_is_root_hub(dev->dev) && usb_hub_is_superspeed(dev)) {
struct usb_port_status *status = (struct usb_port_status *)data;
u16 tmp = (status->wPortStatus) & USB_SS_PORT_STAT_MASK;
if (status->wPortStatus & USB_SS_PORT_STAT_POWER)
tmp |= USB_PORT_STAT_POWER;
if ((status->wPortStatus & USB_SS_PORT_STAT_SPEED) ==
USB_SS_PORT_STAT_SPEED_5GBPS)
tmp |= USB_PORT_STAT_SUPER_SPEED;
status->wPortStatus = tmp;
}
#endif
return ret;
}
static void usb_hub_power_on(struct usb_hub_device *hub)
{
int i;
struct usb_device *dev;
unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
const char *env;
dev = hub->pusb_dev;
debug("enabling power on all ports\n");
for (i = 0; i < dev->maxchild; i++) {
usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
debug("port %d returns %lX\n", i + 1, dev->status);
}
usb: Change power-on / scanning timeout handling This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
2016-03-15 12:59:15 +00:00
#ifdef CONFIG_SANDBOX
/*
* Don't set timeout / delay values here. This results
* in these values still being reset to 0.
*/
if (state_get_skip_delays())
return;
#endif
/*
* Wait for power to become stable,
* plus spec-defined max time for device to connect
* but allow this time to be increased via env variable as some
* devices break the spec and require longer warm-up times
*/
env = env_get("usb_pgood_delay");
if (env)
pgood_delay = max(pgood_delay,
(unsigned)simple_strtol(env, NULL, 0));
debug("pgood_delay=%dms\n", pgood_delay);
usb: Change power-on / scanning timeout handling This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
2016-03-15 12:59:15 +00:00
/*
* Do a minimum delay of the larger value of 100ms or pgood_delay
* so that the power can stablize before the devices are queried
*/
hub->query_delay = get_timer(0) + max(100, (int)pgood_delay);
/*
* Record the power-on timeout here. The max. delay (timeout)
* will be done based on this value in the USB port loop in
* usb_hub_configure() later.
*/
hub->connect_timeout = hub->query_delay + 1000;
debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n",
dev->devnum, max(100, (int)pgood_delay),
max(100, (int)pgood_delay) + 1000);
}
#ifndef CONFIG_DM_USB
static struct usb_hub_device hub_dev[USB_MAX_HUB];
static int usb_hub_index;
void usb_hub_reset(void)
{
usb_hub_index = 0;
usb: Change power-on / scanning timeout handling This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
2016-03-15 12:59:15 +00:00
/* Zero out global hub_dev in case its re-used again */
memset(hub_dev, 0, sizeof(hub_dev));
}
static struct usb_hub_device *usb_hub_allocate(void)
{
if (usb_hub_index < USB_MAX_HUB)
return &hub_dev[usb_hub_index++];
printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
return NULL;
}
#endif
#define MAX_TRIES 5
static inline char *portspeed(int portstatus)
{
char *speed_str;
switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
case USB_PORT_STAT_SUPER_SPEED:
speed_str = "5 Gb/s";
break;
case USB_PORT_STAT_HIGH_SPEED:
speed_str = "480 Mb/s";
break;
case USB_PORT_STAT_LOW_SPEED:
speed_str = "1.5 Mb/s";
break;
default:
speed_str = "12 Mb/s";
break;
}
return speed_str;
}
/**
* usb_hub_port_reset() - reset a port given its usb_device pointer
*
* Reset a hub port and see if a device is present on that port, providing
* sufficient time for it to show itself. The port status is returned.
*
* @dev: USB device to reset
* @port: Port number to reset (note ports are numbered from 0 here)
* @portstat: Returns port status
*/
static int usb_hub_port_reset(struct usb_device *dev, int port,
unsigned short *portstat)
{
int err, tries;
ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
unsigned short portstatus, portchange;
int delay = HUB_SHORT_RESET_TIME; /* start with short reset delay */
#ifdef CONFIG_DM_USB
debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name,
port + 1);
#else
debug("%s: resetting port %d...\n", __func__, port + 1);
#endif
for (tries = 0; tries < MAX_TRIES; tries++) {
err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
if (err < 0)
return err;
mdelay(delay);
if (usb_get_port_status(dev, port + 1, portsts) < 0) {
debug("get_port_status failed status %lX\n",
dev->status);
return -1;
}
portstatus = le16_to_cpu(portsts->wPortStatus);
portchange = le16_to_cpu(portsts->wPortChange);
debug("portstatus %x, change %x, %s\n", portstatus, portchange,
portspeed(portstatus));
debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
" USB_PORT_STAT_ENABLE %d\n",
(portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
(portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
(portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);
usb: hub: don't check CONNECTION in hub_port_reset() One specific USB 3.0 device behaves strangely when reset by usb_new_device()'s call to hub_port_reset(). For some reason, the device appears to briefly drop off the bus when this second bus reset is executed, yet if we retry this loop, it'll eventually come back after another two resets. If USB bus reset is executed over and over within usb_new_device()'s call to hub_port_reset(), I see the following sequence of results, which repeats as long as you want: 1) STAT_C_CONNECTION = 1 STAT_CONNECTION = 0 USB_PORT_STAT_ENABLE 0 2) STAT_C_CONNECTION = 1 STAT_CONNECTION = 1 USB_PORT_STAT_ENABLE 0 3) STAT_C_CONNECTION = 1 STAT_CONNECTION = 1 USB_PORT_STAT_ENABLE 1 The device in question is a SanDisk Ultra USB 3.0 16GB memory stick with USB VID/PID 0x0781/0x5581. In order to allow this device to work with U-Boot, ignore the {C_,}CONNECTION bits in the status/change registers, and only use the ENABLE bit to determine if the reset was successful. To be honest, extensive investigation has failed to determine why this problem occurs. I'd love to know! I don't know if it's caused by: * A HW bug in the device * A HW bug in the Tegra USB controller * A SW bug in the U-Boot Tegra USB driver * A SW bug in the U-Boot USB core This issue only occurs when the device's USB3 pins are attached to the host; if only the USB2 pins are connected the issue does not occur. The USB3 controller on Tegra is in reset, so is not actively communicating with the device at all - a USB3 analyzer confirms this. Slightly unplugging the device (so the USB3 pins don't contact) or using a USB2 cable or hub as an intermediary avoids the problem. For some reason, the Linux kernel (either on the same Tegra board, or on an x86 host) has no issue with the device, and I observe no disconnections during reset. This change won't affect any USB device that already works, since such devices could not currently be triggering the error return this patch removes, or they wouldn't be working currently. However, this patch is quite reliable in practice, hence I hope it's acceptable to solve the problem. The only potential fallout I can see from this patch is: * A broken device that triggers C_CONNECTION/!CONNECTION now causes the loop in hub_port_reset() to run multiple times. If it never succeeds, this will cause "usb start" to take roughly 1s extra to execute. * If the user unplugs a device while hub_port_reset() is executing, and very quickly swaps in a new device, hub_port_reset() might succeed on the new device. This would mean that any information cached about the original device (from the descriptor read in usb_new_device(), which simply caches the max packet size) might be invalid, which would cause problems talking to the new device. However, without this change, the new device wouldn't work anyway, so this is probably not much of a loss. Signed-off-by: Stephen Warren <swarren@nvidia.com>
2014-08-07 23:07:59 +00:00
/*
* Perhaps we should check for the following here:
* - C_CONNECTION hasn't been set.
* - CONNECTION is still set.
*
* Doing so would ensure that the device is still connected
* to the bus, and hasn't been unplugged or replaced while the
* USB bus reset was going on.
*
* However, if we do that, then (at least) a San Disk Ultra
* USB 3.0 16GB device fails to reset on (at least) an NVIDIA
* Tegra Jetson TK1 board. For some reason, the device appears
* to briefly drop off the bus when this second bus reset is
* executed, yet if we retry this loop, it'll eventually come
* back after another reset or two.
*/
if (portstatus & USB_PORT_STAT_ENABLE)
break;
/* Switch to long reset delay for the next round */
delay = HUB_LONG_RESET_TIME;
}
if (tries == MAX_TRIES) {
debug("Cannot enable port %i after %i retries, " \
"disabling port.\n", port + 1, MAX_TRIES);
debug("Maybe the USB cable is bad?\n");
return -1;
}
usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
*portstat = portstatus;
return 0;
}
int usb_hub_port_connect_change(struct usb_device *dev, int port)
{
ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
unsigned short portstatus;
int ret, speed;
/* Check status */
ret = usb_get_port_status(dev, port + 1, portsts);
if (ret < 0) {
debug("get_port_status failed\n");
return ret;
}
portstatus = le16_to_cpu(portsts->wPortStatus);
debug("portstatus %x, change %x, %s\n",
portstatus,
le16_to_cpu(portsts->wPortChange),
portspeed(portstatus));
/* Clear the connection change status */
usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);
/* Disconnect any existing devices under this port */
if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
(!(portstatus & USB_PORT_STAT_ENABLE))) ||
usb_device_has_child_on_port(dev, port)) {
debug("usb_disconnect(&hub->children[port]);\n");
/* Return now if nothing is connected */
if (!(portstatus & USB_PORT_STAT_CONNECTION))
return -ENOTCONN;
}
/* Reset the port */
ret = usb_hub_port_reset(dev, port, &portstatus);
if (ret < 0) {
if (ret != -ENXIO)
printf("cannot reset port %i!?\n", port + 1);
return ret;
}
switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
case USB_PORT_STAT_SUPER_SPEED:
speed = USB_SPEED_SUPER;
break;
case USB_PORT_STAT_HIGH_SPEED:
speed = USB_SPEED_HIGH;
break;
case USB_PORT_STAT_LOW_SPEED:
speed = USB_SPEED_LOW;
break;
default:
speed = USB_SPEED_FULL;
break;
}
#ifdef CONFIG_DM_USB
struct udevice *child;
ret = usb_scan_device(dev->dev, port + 1, speed, &child);
#else
struct usb_device *usb;
ret = usb_alloc_new_device(dev->controller, &usb);
if (ret) {
printf("cannot create new device: ret=%d", ret);
return ret;
}
dev->children[port] = usb;
usb->speed = speed;
usb->parent = dev;
usb->portnr = port + 1;
/* Run it through the hoops (find a driver, etc) */
ret = usb_new_device(usb);
if (ret < 0) {
/* Woops, disable the port */
usb_free_device(dev->controller);
dev->children[port] = NULL;
}
#endif
if (ret < 0) {
debug("hub: disabling port %d\n", port + 1);
usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
}
return ret;
}
usb: Change power-on / scanning timeout handling This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
2016-03-15 12:59:15 +00:00
static int usb_scan_port(struct usb_device_scan *usb_scan)
{
ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
unsigned short portstatus;
unsigned short portchange;
struct usb_device *dev;
struct usb_hub_device *hub;
int ret = 0;
int i;
dev = usb_scan->dev;
hub = usb_scan->hub;
i = usb_scan->port;
/*
* Don't talk to the device before the query delay is expired.
* This is needed for voltages to stabalize.
*/
if (get_timer(0) < hub->query_delay)
return 0;
ret = usb_get_port_status(dev, i + 1, portsts);
if (ret < 0) {
debug("get_port_status failed\n");
if (get_timer(0) >= hub->connect_timeout) {
debug("devnum=%d port=%d: timeout\n",
dev->devnum, i + 1);
/* Remove this device from scanning list */
list_del(&usb_scan->list);
free(usb_scan);
return 0;
}
return 0;
usb: Change power-on / scanning timeout handling This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
2016-03-15 12:59:15 +00:00
}
portstatus = le16_to_cpu(portsts->wPortStatus);
portchange = le16_to_cpu(portsts->wPortChange);
debug("Port %d Status %X Change %X\n", i + 1, portstatus, portchange);
/*
* No connection change happened, wait a bit more.
*
* For some situation, the hub reports no connection change but a
* device is connected to the port (eg: CCS bit is set but CSC is not
* in the PORTSC register of a root hub), ignore such case.
*/
if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
!(portstatus & USB_PORT_STAT_CONNECTION)) {
usb: Change power-on / scanning timeout handling This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
2016-03-15 12:59:15 +00:00
if (get_timer(0) >= hub->connect_timeout) {
debug("devnum=%d port=%d: timeout\n",
dev->devnum, i + 1);
/* Remove this device from scanning list */
list_del(&usb_scan->list);
free(usb_scan);
return 0;
}
return 0;
}
/* A new USB device is ready at this point */
debug("devnum=%d port=%d: USB dev found\n", dev->devnum, i + 1);
usb_hub_port_connect_change(dev, i);
if (portchange & USB_PORT_STAT_C_ENABLE) {
debug("port %d enable change, status %x\n", i + 1, portstatus);
usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE);
/*
* The following hack causes a ghost device problem
* to Faraday EHCI
*/
#ifndef CONFIG_USB_EHCI_FARADAY
/*
* EM interference sometimes causes bad shielded USB
* devices to be shutdown by the hub, this hack enables
* them again. Works at least with mouse driver
*/
if (!(portstatus & USB_PORT_STAT_ENABLE) &&
(portstatus & USB_PORT_STAT_CONNECTION) &&
usb_device_has_child_on_port(dev, i)) {
debug("already running port %i disabled by hub (EMI?), re-enabling...\n",
i + 1);
usb_hub_port_connect_change(dev, i);
}
#endif
}
if (portstatus & USB_PORT_STAT_SUSPEND) {
debug("port %d suspend change\n", i + 1);
usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_SUSPEND);
}
if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
debug("port %d over-current change\n", i + 1);
usb_clear_port_feature(dev, i + 1,
USB_PORT_FEAT_C_OVER_CURRENT);
/* Only power-on this one port */
usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
hub->overcurrent_count[i]++;
/*
* If the max-scan-count is not reached, return without removing
* the device from scan-list. This will re-issue a new scan.
*/
if (hub->overcurrent_count[i] <=
PORT_OVERCURRENT_MAX_SCAN_COUNT)
return 0;
/* Otherwise the device will get removed */
printf("Port %d over-current occurred %d times\n", i + 1,
usb: Change power-on / scanning timeout handling This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
2016-03-15 12:59:15 +00:00
hub->overcurrent_count[i]);
}
if (portchange & USB_PORT_STAT_C_RESET) {
debug("port %d reset change\n", i + 1);
usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET);
}
/*
* We're done with this device, so let's remove this device from
* scanning list
*/
list_del(&usb_scan->list);
free(usb_scan);
return 0;
}
static int usb_device_list_scan(void)
{
struct usb_device_scan *usb_scan;
struct usb_device_scan *tmp;
static int running;
int ret = 0;
/* Only run this loop once for each controller */
if (running)
return 0;
running = 1;
while (1) {
/* We're done, once the list is empty again */
if (list_empty(&usb_scan_list))
goto out;
list_for_each_entry_safe(usb_scan, tmp, &usb_scan_list, list) {
int ret;
/* Scan this port */
ret = usb_scan_port(usb_scan);
if (ret)
goto out;
}
}
out:
/*
* This USB controller has finished scanning all its connected
* USB devices. Set "running" back to 0, so that other USB controllers
* will scan their devices too.
*/
running = 0;
return ret;
}
static struct usb_hub_device *usb_get_hub_device(struct usb_device *dev)
{
struct usb_hub_device *hub;
#ifndef CONFIG_DM_USB
/* "allocate" Hub device */
hub = usb_hub_allocate();
#else
hub = dev_get_uclass_priv(dev->dev);
#endif
return hub;
}
static int usb_hub_configure(struct usb_device *dev)
{
int i, length;
ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
unsigned char *bitmap;
short hubCharacteristics;
struct usb_hub_descriptor *descriptor;
struct usb_hub_device *hub;
__maybe_unused struct usb_hub_status *hubsts;
int ret;
hub = usb_get_hub_device(dev);
if (hub == NULL)
return -ENOMEM;
hub->pusb_dev = dev;
/* Get the the hub descriptor */
ret = usb_get_hub_descriptor(dev, buffer, 4);
if (ret < 0) {
debug("usb_hub_configure: failed to get hub " \
"descriptor, giving up %lX\n", dev->status);
return ret;
}
descriptor = (struct usb_hub_descriptor *)buffer;
length = min_t(int, descriptor->bLength,
sizeof(struct usb_hub_descriptor));
ret = usb_get_hub_descriptor(dev, buffer, length);
if (ret < 0) {
debug("usb_hub_configure: failed to get hub " \
"descriptor 2nd giving up %lX\n", dev->status);
return ret;
}
memcpy((unsigned char *)&hub->desc, buffer, length);
/* adjust 16bit values */
put_unaligned(le16_to_cpu(get_unaligned(
&descriptor->wHubCharacteristics)),
&hub->desc.wHubCharacteristics);
/* set the bitmap */
bitmap = (unsigned char *)&hub->desc.u.hs.DeviceRemovable[0];
/* devices not removable by default */
memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
bitmap = (unsigned char *)&hub->desc.u.hs.PortPowerCtrlMask[0];
memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
hub->desc.u.hs.DeviceRemovable[i] =
descriptor->u.hs.DeviceRemovable[i];
for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
hub->desc.u.hs.PortPowerCtrlMask[i] =
descriptor->u.hs.PortPowerCtrlMask[i];
dev->maxchild = descriptor->bNbrPorts;
debug("%d ports detected\n", dev->maxchild);
hubCharacteristics = get_unaligned(&hub->desc.wHubCharacteristics);
switch (hubCharacteristics & HUB_CHAR_LPSM) {
case 0x00:
debug("ganged power switching\n");
break;
case 0x01:
debug("individual port power switching\n");
break;
case 0x02:
case 0x03:
debug("unknown reserved power switching mode\n");
break;
}
if (hubCharacteristics & HUB_CHAR_COMPOUND)
debug("part of a compound device\n");
else
debug("standalone hub\n");
switch (hubCharacteristics & HUB_CHAR_OCPM) {
case 0x00:
debug("global over-current protection\n");
break;
case 0x08:
debug("individual port over-current protection\n");
break;
case 0x10:
case 0x18:
debug("no over-current protection\n");
break;
}
switch (dev->descriptor.bDeviceProtocol) {
case USB_HUB_PR_FS:
break;
case USB_HUB_PR_HS_SINGLE_TT:
debug("Single TT\n");
break;
case USB_HUB_PR_HS_MULTI_TT:
ret = usb_set_interface(dev, 0, 1);
if (ret == 0) {
debug("TT per port\n");
hub->tt.multi = true;
} else {
debug("Using single TT (err %d)\n", ret);
}
break;
case USB_HUB_PR_SS:
/* USB 3.0 hubs don't have a TT */
break;
default:
debug("Unrecognized hub protocol %d\n",
dev->descriptor.bDeviceProtocol);
break;
}
/* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
switch (hubCharacteristics & HUB_CHAR_TTTT) {
case HUB_TTTT_8_BITS:
if (dev->descriptor.bDeviceProtocol != 0) {
hub->tt.think_time = 666;
debug("TT requires at most %d FS bit times (%d ns)\n",
8, hub->tt.think_time);
}
break;
case HUB_TTTT_16_BITS:
hub->tt.think_time = 666 * 2;
debug("TT requires at most %d FS bit times (%d ns)\n",
16, hub->tt.think_time);
break;
case HUB_TTTT_24_BITS:
hub->tt.think_time = 666 * 3;
debug("TT requires at most %d FS bit times (%d ns)\n",
24, hub->tt.think_time);
break;
case HUB_TTTT_32_BITS:
hub->tt.think_time = 666 * 4;
debug("TT requires at most %d FS bit times (%d ns)\n",
32, hub->tt.think_time);
break;
}
debug("power on to power good time: %dms\n",
descriptor->bPwrOn2PwrGood * 2);
debug("hub controller current requirement: %dmA\n",
descriptor->bHubContrCurrent);
for (i = 0; i < dev->maxchild; i++)
debug("port %d is%s removable\n", i + 1,
hub->desc.u.hs.DeviceRemovable[(i + 1) / 8] & \
(1 << ((i + 1) % 8)) ? " not" : "");
if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
debug("usb_hub_configure: failed to get Status - " \
"too long: %d\n", descriptor->bLength);
return -EFBIG;
}
ret = usb_get_hub_status(dev, buffer);
if (ret < 0) {
debug("usb_hub_configure: failed to get Status %lX\n",
dev->status);
return ret;
}
#ifdef DEBUG
hubsts = (struct usb_hub_status *)buffer;
#endif
debug("get_hub_status returned status %X, change %X\n",
le16_to_cpu(hubsts->wHubStatus),
le16_to_cpu(hubsts->wHubChange));
debug("local power source is %s\n",
(le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_LOCAL_POWER) ? \
"lost (inactive)" : "good");
debug("%sover-current condition exists\n",
(le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
"" : "no ");
#ifdef CONFIG_DM_USB
/*
* Update USB host controller's internal representation of this hub
* after the hub descriptor is fetched.
*/
ret = usb_update_hub_device(dev);
if (ret < 0 && ret != -ENOSYS) {
debug("%s: failed to update hub device for HCD (%x)\n",
__func__, ret);
return ret;
}
/*
* A maximum of seven tiers are allowed in a USB topology, and the
* root hub occupies the first tier. The last tier ends with a normal
* USB device. USB 3.0 hubs use a 20-bit field called 'route string'
* to route packets to the designated downstream port. The hub uses a
* hub depth value multiplied by four as an offset into the 'route
* string' to locate the bits it uses to determine the downstream
* port number.
*/
if (usb_hub_is_root_hub(dev->dev)) {
hub->hub_depth = -1;
} else {
struct udevice *hdev;
int depth = 0;
hdev = dev->dev->parent;
while (!usb_hub_is_root_hub(hdev)) {
depth++;
hdev = hdev->parent;
}
hub->hub_depth = depth;
if (usb_hub_is_superspeed(dev)) {
debug("set hub (%p) depth to %d\n", dev, depth);
/*
* This request sets the value that the hub uses to
* determine the index into the 'route string index'
* for this hub.
*/
ret = usb_set_hub_depth(dev, depth);
if (ret < 0) {
debug("%s: failed to set hub depth (%lX)\n",
__func__, dev->status);
return ret;
}
}
}
#endif
usb_hub_power_on(hub);
/*
* Reset any devices that may be in a bad state when applying
* the power. This is a __weak function. Resetting of the devices
* should occur in the board file of the device.
*/
for (i = 0; i < dev->maxchild; i++)
usb_hub_reset_devices(i + 1);
usb: Change power-on / scanning timeout handling This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
2016-03-15 12:59:15 +00:00
/*
* Only add the connected USB devices, including potential hubs,
* to a scanning list. This list will get scanned and devices that
* are detected (either via port connected or via port timeout)
* will get removed from this list. Scanning of the devices on this
* list will continue until all devices are removed.
*/
for (i = 0; i < dev->maxchild; i++) {
usb: Change power-on / scanning timeout handling This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
2016-03-15 12:59:15 +00:00
struct usb_device_scan *usb_scan;
usb: Change power-on / scanning timeout handling This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
2016-03-15 12:59:15 +00:00
usb_scan = calloc(1, sizeof(*usb_scan));
if (!usb_scan) {
printf("Can't allocate memory for USB device!\n");
return -ENOMEM;
}
usb: Change power-on / scanning timeout handling This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
2016-03-15 12:59:15 +00:00
usb_scan->dev = dev;
usb_scan->hub = hub;
usb_scan->port = i;
list_add_tail(&usb_scan->list, &usb_scan_list);
}
usb: Change power-on / scanning timeout handling This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
2016-03-15 12:59:15 +00:00
/*
* And now call the scanning code which loops over the generated list
*/
ret = usb_device_list_scan();
usb: Change power-on / scanning timeout handling This patch changes the USB port scanning procedure and timeout handling in the following ways: a) The power-on delay in usb_hub_power_on() is now reduced to a value of max(100ms, "hub->desc.bPwrOn2PwrGood * 2"). The code does not wait using mdelay, instead usb_hub_power_on() will wait before querying the device in the scanning loop later. The total timeout for this hub, which is 1 second + "hub->desc.bPwrOn2PwrGood * 2" is calculated and will be used in the following per-port scanning loop as the timeout to detect active USB devices on this hub. b) Don't delay the minimum delay (for power to stabilize) in usb_hub_power_on(). Instead skip querying these devices in the scannig loop until the delay time is reached. c) The ports are now scanned in a quasi parallel way. The current code did wait for each (unconnected) port to reach its timeout and only then continue with the next port. This patch now changes this to scan all ports of all USB hubs quasi simultaneously. For this, all ports are added to a scanning list. This list is scanned until all ports are ready by either a) reaching the connection timeout (calculated earlier), or by b) detecting a USB device. This results in a faster USB scan time as the recursive scanning of USB hubs connected to the hub that's currently being scanned will start earlier. One small functional change to the original code is, that ports with overcurrent detection will now get rescanned multiple times (PORT_OVERCURRENT_MAX_SCAN_COUNT). Without this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 20.163 seconds With this patch: starting USB... USB0: USB EHCI 1.00 scanning bus 0 for devices... 9 USB Device(s) found time: 1.822 seconds So ~18.3 seconds of USB scanning time reduction. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Stephen Warren <swarren@nvidia.com>
2016-03-15 12:59:15 +00:00
return ret;
}
static int usb_hub_check(struct usb_device *dev, int ifnum)
{
struct usb_interface *iface;
struct usb_endpoint_descriptor *ep = NULL;
iface = &dev->config.if_desc[ifnum];
/* Is it a hub? */
if (iface->desc.bInterfaceClass != USB_CLASS_HUB)
goto err;
/* Some hubs have a subclass of 1, which AFAICT according to the */
/* specs is not defined, but it works */
if ((iface->desc.bInterfaceSubClass != 0) &&
(iface->desc.bInterfaceSubClass != 1))
goto err;
/* Multiple endpoints? What kind of mutant ninja-hub is this? */
if (iface->desc.bNumEndpoints != 1)
goto err;
ep = &iface->ep_desc[0];
/* Output endpoint? Curiousier and curiousier.. */
if (!(ep->bEndpointAddress & USB_DIR_IN))
goto err;
/* If it's not an interrupt endpoint, we'd better punt! */
if ((ep->bmAttributes & 3) != 3)
goto err;
/* We found a hub */
debug("USB hub found\n");
return 0;
err:
debug("USB hub not found: bInterfaceClass=%d, bInterfaceSubClass=%d, bNumEndpoints=%d\n",
iface->desc.bInterfaceClass, iface->desc.bInterfaceSubClass,
iface->desc.bNumEndpoints);
if (ep) {
debug(" bEndpointAddress=%#x, bmAttributes=%d",
ep->bEndpointAddress, ep->bmAttributes);
}
return -ENOENT;
}
int usb_hub_probe(struct usb_device *dev, int ifnum)
{
int ret;
ret = usb_hub_check(dev, ifnum);
if (ret)
return 0;
ret = usb_hub_configure(dev);
return ret;
}
#ifdef CONFIG_DM_USB
int usb_hub_scan(struct udevice *hub)
{
struct usb_device *udev = dev_get_parent_priv(hub);
return usb_hub_configure(udev);
}
static int usb_hub_post_probe(struct udevice *dev)
{
debug("%s\n", __func__);
return usb_hub_scan(dev);
}
static const struct udevice_id usb_hub_ids[] = {
{ .compatible = "usb-hub" },
{ }
};
U_BOOT_DRIVER(usb_generic_hub) = {
.name = "usb_hub",
.id = UCLASS_USB_HUB,
.of_match = usb_hub_ids,
.flags = DM_FLAG_ALLOC_PRIV_DMA,
};
UCLASS_DRIVER(usb_hub) = {
.id = UCLASS_USB_HUB,
.name = "usb_hub",
.post_bind = dm_scan_fdt_dev,
.post_probe = usb_hub_post_probe,
.child_pre_probe = usb_child_pre_probe,
.per_child_auto_alloc_size = sizeof(struct usb_device),
.per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
.per_device_auto_alloc_size = sizeof(struct usb_hub_device),
};
static const struct usb_device_id hub_id_table[] = {
{
.match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
.bDeviceClass = USB_CLASS_HUB
},
{ } /* Terminating entry */
};
U_BOOT_USB_DEVICE(usb_generic_hub, hub_id_table);
#endif