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author | Peter Tyser <ptyser@xes-inc.com> | 2011-01-10 17:34:14 -0600 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-01-22 18:38:58 -0800 |
commit | cc604ddd118cf4a699c12bc41a5fa2d2f225f702 (patch) | |
tree | 6efdd3c28567a7cbdb030a08f1a27b95f88364ce /drivers/usb/serial/usb-serial.c | |
parent | ad84e4a9efb7c8ed322bafb6ebdb9c3a49a3d3a8 (diff) | |
download | kernel_samsung_smdk4412-cc604ddd118cf4a699c12bc41a5fa2d2f225f702.zip kernel_samsung_smdk4412-cc604ddd118cf4a699c12bc41a5fa2d2f225f702.tar.gz kernel_samsung_smdk4412-cc604ddd118cf4a699c12bc41a5fa2d2f225f702.tar.bz2 |
USB: ehci-fsl: Fix 'have_sysif_regs' detection
Previously a check was done on an ID register at the base of a CPU's
internal USB registers to determine if system interface regsiters were
present. The check looked for an ID register that had the format
ID[0:5] == ~ID[8:13] as described in the MPC5121 User's Manual to
determine if a MPC5121 or MPC83xx/85xx was being used.
There are two issues with this method:
- The ID register is not defined on the MPC83xx/85xx CPUs, so its
unclear what is being checked on them.
- Newer CPUs such as the P4080 also don't document the ID register, but
do share the same format as the MPC5121. Thus the previous code did
not set 'have_sysif_regs' properly which results in the P4080 not
properly initializing its USB ports.
Using the device tree 'compatible' node is a cleaner way to determine if
'have_sysif_regs' should be set and resolves the USB initialization issue
seen on the P4080.
Tested on a P4080-based system and compile tested on mpc512x_defconfig
with Freescale EHCI driver enabled.
Cc: Anatolij Gustschin <agust@denx.de>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial/usb-serial.c')
0 files changed, 0 insertions, 0 deletions