linux/drivers/usb
Fabio Estevam 0247a7bcd4 USB: ehci-mxc: Setup portsc register prior to accessing OTG viewport
In order to read/write to the i.MX OTG viewport register it is necessary to setup
the PORTSCx register first.

By default i.MX OTG port is configured for USB serial PHY. In order to use a ULPI PHY
the PORTSCx register needs to be configured properly.

commit 724c852 (USB: ehci/mxc: compile fix) placed the PORTSC setup after the OTG
viewport is accessed and this causes ULPI read/write to fail.

Revert the PORTSC setup order.

Tested on a MX31PDK board with a ISP1504 transceiver:

ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
mxc-ehci mxc-ehci.0: initializing i.MX USB Controller
ULPI transceiver vendor/product ID 0x04cc/0x1504
Found NXP ISP1504 ULPI transceiver.
ULPI integrity check: passed.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-12-16 13:37:48 -08:00
..
atm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2010-12-14 17:33:40 -08:00
c67x00 usb: makefile cleanup 2010-10-22 10:22:07 -07:00
class Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2010-10-22 20:30:48 -07:00
core Merge branch 'usb-next' into musb-merge 2010-12-16 10:05:06 -08:00
early usb: makefile cleanup 2010-10-22 10:22:07 -07:00
gadget USB: atmel_usba_udc: fix freeing irq in usba_udc_remove() 2010-12-16 13:36:12 -08:00
host USB: ehci-mxc: Setup portsc register prior to accessing OTG viewport 2010-12-16 13:37:48 -08:00
image SCSI host lock push-down 2010-11-16 13:33:23 -08:00
misc USB: yurex: add .llseek fop to file_operations 2010-11-30 10:24:50 -08:00
mon Merge branch 'usb-next' into musb-merge 2010-12-16 10:05:06 -08:00
musb Merge branch 'usb-next' into musb-merge 2010-12-16 10:05:06 -08:00
otg Merge branch 'usb-next' into musb-merge 2010-12-16 10:05:06 -08:00
serial Merge branch 'usb-next' into musb-merge 2010-12-16 10:05:06 -08:00
storage Merge branch 'usb-next' into musb-merge 2010-12-16 10:05:06 -08:00
wusbcore usb: makefile cleanup 2010-10-22 10:22:07 -07:00
Kconfig USB: EHCI: Add MSM Host Controller driver 2010-12-10 14:23:32 -08:00
Makefile USB: drivers/usb/Makefile: conditionally descend to 'early' 2010-08-10 14:35:38 -07:00
README
usb-skeleton.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00

To understand all the Linux-USB framework, you'll use these resources:

    * This source code.  This is necessarily an evolving work, and
      includes kerneldoc that should help you get a current overview.
      ("make pdfdocs", and then look at "usb.pdf" for host side and
      "gadget.pdf" for peripheral side.)  Also, Documentation/usb has
      more information.

    * The USB 2.0 specification (from www.usb.org), with supplements
      such as those for USB OTG and the various device classes.
      The USB specification has a good overview chapter, and USB
      peripherals conform to the widely known "Chapter 9".

    * Chip specifications for USB controllers.  Examples include
      host controllers (on PCs, servers, and more); peripheral
      controllers (in devices with Linux firmware, like printers or
      cell phones); and hard-wired peripherals like Ethernet adapters.

    * Specifications for other protocols implemented by USB peripheral
      functions.  Some are vendor-specific; others are vendor-neutral
      but just standardized outside of the www.usb.org team.

Here is a list of what each subdirectory here is, and what is contained in
them.

core/		- This is for the core USB host code, including the
		  usbfs files and the hub class driver ("khubd").

host/		- This is for USB host controller drivers.  This
		  includes UHCI, OHCI, EHCI, and others that might
		  be used with more specialized "embedded" systems.

gadget/		- This is for USB peripheral controller drivers and
		  the various gadget drivers which talk to them.


Individual USB driver directories.  A new driver should be added to the
first subdirectory in the list below that it fits into.

image/		- This is for still image drivers, like scanners or
		  digital cameras.
../input/	- This is for any driver that uses the input subsystem,
		  like keyboard, mice, touchscreens, tablets, etc.
../media/	- This is for multimedia drivers, like video cameras,
		  radios, and any other drivers that talk to the v4l
		  subsystem.
../net/		- This is for network drivers.
serial/		- This is for USB to serial drivers.
storage/	- This is for USB mass-storage drivers.
class/		- This is for all USB device drivers that do not fit
		  into any of the above categories, and work for a range
		  of USB Class specified devices. 
misc/		- This is for all USB device drivers that do not fit
		  into any of the above categories.