treewide: remove references to CREDITS ...

The CREDITS file was removed from barebox in 2015 by commit 6570288f2d97
("Remove the CREDITS file"). Remove references to it from several files.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: hub: When no connection came up remove from scanning list ...

When after a timeout no connection came up then we have not only bail
out, but also remove the device from the scanning list. Otherwise it
can happen that the list never becomes empty and we probe forever.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: Add super speed support ...

This adds the missing bits and pieces to add super speed support to the
USB stack. It is based on the corresponding U-Boot code.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: hub: Translate USB 3.0 hub port status into old version ...

Adoption of U-Boot commit:

| 1commit 74ffc7c
| Author: Bin Meng <bmeng.cn@gmail.com>
| Date:   Wed Jul 19 21:51:12 2017 +0800
|
|     usb: hub: Translate USB 3.0 hub port status into old version
|
|     USB 3.0 hub port status field has different bit positions from 2.0
|     hubs. Since U-Boot only understands the old version, translate the
|     new one into the old one.
|
|     Since we are going to add USB 3.0 hub support, this feature is only
|     available with driver model USB.
|
|     Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
|     Reviewed-by: Simon Glass <sjg@chromium.org>

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: factor out a usb_setup_descriptor() function ...

This factors out a usb_setup_descriptor() function with the goal to
make the code better comparable to the corresponding U-Boot code.

This also incorporates this U-Boot commit:

| commit 2b338ef
| Author: Hans de Goede <hdegoede@redhat.com>
| Date:   Tue May 5 23:56:04 2015 +0200
|
|     usb: Fix maxpacketsize for first descriptor read for low-speed usb devs
|
|     This fixes descriptor reading of lowspeed devices through ohci not working.
|
|     Signed-off-by: Hans de Goede <hdegoede@redhat.com>
|     Acked-by: Marek Vasut <marex@denx.de>

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: remove unnecessary variable ...

"tmp" is only used to store the size of the descriptor. The name is not
very meaningful and "tmp" is not even used everywhere it could be used.
Just replace by using sizeof() directly where needed.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: Assign dev_index once ...

dev->devnum is set once in usb_alloc_new_device(), set to 0 again later
in usb_new_device() and then set back to the original value. This seems
unnecessary, just set devnum once right before calling usb_set_address()
on the device.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: support set hub depth request for USB 3.0 hubs ...

This is an adoption of U-Boot commit bbc6f06:

| commit bbc6f06
| Author: Bin Meng <bmeng.cn@gmail.com>
| Date:   Wed Jul 19 21:51:13 2017 +0800
|
|     usb: hub: Support 'set hub depth' request for USB 3.0 hubs
|
|     USB 3.0 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. We shall set the hub depth value of a USB
|     3.0 hub after it is configured.
|
|     Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
|     Reviewed-by: Simon Glass <sjg@chromium.org>

In this patch we also support recording the depth of a hub in
struct usb_device.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: host: make init hook optional ...

For controllers which do everything relevant during probe time
make the init hook optional.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: hub: Parse and save TT details from device descriptor ...

Adoption of U-Boot commit 5624dfd:

| commit 5624dfd
| Author: Bin Meng <bmeng.cn@gmail.com>
| Date:   Wed Jul 19 21:51:16 2017 +0800
|
|     usb: hub: Parse and save TT details from device descriptor
|
|     A high speed hub has a special responsibility to handle full speed/
|     low speed devices connected on downstream ports. In this case, the
|     hub must isolate the high speed signaling environment from the full
|     speed/low speed signaling environment with the help of Transaction
|     Translator (TT). TT details are provided by hub descriptors and we
|     parse and save it to hub uclass_priv for later use.
|
|     Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
|     Reviewed-by: Simon Glass <sjg@chromium.org>

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: Use dev_* ...

Give the USB messages some context by using dev_* functions rather than
printf()/debug().

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: Set new USB device name earlier ...

in usb_new_device() set the device name as early as possible to let
dev_* functions print a meaningful name.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: hub: Do not power-cycle usb devices on init ...

This is an adoption of U-Boot commit 0834bb2fb0 ("usb: Do not power-cycle
usb devices on init")

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: Pass portstatus/portchange to usb_hub_port_connect_change() ...

portstatus/portchange have just been read in usb_scan_port(), there
shouldn't be any need to read them again in
usb_hub_port_connect_change().

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: Remove hack from the early days ...

The weird hack about "bad shielded USB devices" goes back to the initial
U-Boot git commmit. Let's be bold and remove it 18 years later.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: hub: let usb_scan_port() return void ...

usb_scan_port() never returns anything else but 0, so let it return
void.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: hub: do not reset devices twice ...

U-Boot has this since 3ed9eb93c2 ("usb: Don't reset the USB hub a 2nd
time"), so do the same for barebox.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: hub: Make debugging output more consistent ...

Some of the messages print the port they belong to, others don't. Print
the port consistently in all debugging messages. Also remove some stray
'\' in the messages.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: Add extra delay for device scan ...

Since b1d9837182, detection of various USB flash drives stopped working.
While the changes itself look correct, probably the HUB requires some
"recovery time" between the GET_STATUS commands in order to be able to
detect devices.

Our configuration: i.MX6ULL (USB-OTG) with only one port on the root
HUB. This port is connected to a Microchip USB4916 hub (permanently
attached). The USB4916 is configured with it's power on defaults which
means that bPwrOn2PwrGood is set to the maximum (0xFF = 510 ms).

Fixes: b1d9837182 ("usb: Change power-on / scanning timeout handling")
Signed-off-by: Christian Eggers <ceggers@arri.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: Forward error code from usb_set_configuration ...

Instead of returning -1 forward the error code and take the opportunity
to print the error string.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: Make timeout unit clear ...

The usb_*_msg() functions take a timeout parameter. Make clear which
unit is expected by adding a _ms suffix to the variable name.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: Change power-on / scanning timeout handling ...

Change USB port scanning procedure and timeout handling in the
following ways:

1)
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 connection 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.

2)
Don't delay the minimum delay (for power to stabilize) in
usb_hub_power_on(). Instead skip querying these devices in the scanning
loop usb_scan_port() until the delay time is reached.

3)
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 in usb_hub_configure_ports(). The list is later scanned
in usb_device_list_scan() 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.

4)
Ports with overcurrent detection will get scanned multiple times if OC
condition is detected (PORT_OVERCURRENT_MAX_SCAN_COUNT).

Without patch:

    $ time usb
    usb: USB: scanning bus for devices...
    usb: 17 USB Device(s) found
    time: 10344ms

With patch:

    $ time usb
    usb: USB: scanning bus for devices...
    usb: 17 USB Device(s) found
    time: 4529ms

Delta: ~6 seconds

Signed-off-by: Primoz Fiser <primoz.fiser@norik.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: usb_hub_port_connect_change(): Remove unnecessary delays ...

Remove two mdelay(200) calls from usb_hub_port_connect_change() before
and after calling hub_port_reset().

These delays don't seem to be necessary since hub_port_reset() already
incorporates delays on its own.

Without patch:

    $ time usb
    usb: USB: scanning bus for devices...
    usb: 17 USB Device(s) found
    time: 16355ms

With patch:

    $ time usb
    usb: USB: scanning bus for devices...
    usb: 17 USB Device(s) found
    time: 10344ms

Delta: ~6 seconds

Signed-off-by: Primoz Fiser <primoz.fiser@norik.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: hub_port_reset(): Speedup hub reset handling ...

Start with a short USB hub reset delay of 20ms. This can be enough for
some configurations. Switch to longer reset delay only if the short
delay hasn't been long enough.

This USB hub reset handling strategy is also used in the Linux kernel
USB hub driver, function hub_port_reset().

Without patch:

    $ time usb
    usb: USB: scanning bus for devices...
    usb: 17 USB Device(s) found
    time: 21750ms

With patch:

    $ time usb
    usb: USB: scanning bus for devices...
    usb: 17 USB Device(s) found
    time: 16355ms

Delta: ~5.5 seconds

Signed-off-by: Primoz Fiser <primoz.fiser@norik.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: Drop usb_disable_asynch() ...

There are no users of usb_control_msg() in the codebase that pass
timeout of 0, so it doesn't look like usb_disable_asynch() has any
effect on USB operation. Drop that function and remove all of its uses
to simplify things.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

usb: hub: Do not include <scsi.h> ...

No symbols found in <scsi.h> are used in this file. Drop it.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/usb'

usb: Add usb_unregister_host() ...

We have usb_register_host() which puts a new host on the list
of hosts we should also have the opposite which removes the
host from the list again.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers: Introduce dev_set_name() ...

Introduce dev_set_name() in order to hide implementation details of
setting device's name so it'd be easier to change it.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

USB: host: hub: Adjust device speed after every port reset ...

To account for the possibility of a device coming out of second reset
operating at different speed compared to first, move the code that
stores device speed to be a part of hub_port_reset(). This way any
speed change happening as a result of port reset could be accounted
for.

The above behaviour was observed on i.MX51 ZII RDU1, on USBH2 port
connected to SMSC2660 USB Hub/SD card reader. For reasons unclear,
first reset would put it into Full Speed mode whereas second would
result in switch to High Speed. Artifically disabling second reset
would result in the device operating at Full Speed.

Not doing second speed adjustement on that board result would result
in un-processed control transfer and failure to execute
usb_set_address().

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>