Doug / smarc-fsl-linux-kernel

19 Oct, 2007

1 commit

  • 8f4ce8c32   serial: turn serial console suspend a boot rather than compile time option ... Browse Code »

    Currently, there's a CONFIG_DISABLE_CONSOLE_SUSPEND that allows one to stop
    the serial console from being suspended when the rest of the machine goes
    to sleep. This is incredibly useful for debugging power management-related
    things; however, having it as a compile-time option has proved to be
    incredibly inconvenient for us (OLPC). There are plenty of times that we
    want serial console to not suspend, but for the most part we'd like serial
    console to be suspended.

    This drops CONFIG_DISABLE_CONSOLE_SUSPEND, and replaces it with a kernel
    boot parameter (no_console_suspend). By default, the serial console will
    be suspended along with the rest of the system; by passing
    'no_console_suspend' to the kernel during boot, serial console will remain
    alive during suspend.

    For now, this is pretty serial console specific; further fixes could be
    applied to make this work for things like netconsole.

    Signed-off-by: Andres Salomon
    Acked-by: "Rafael J. Wysocki"
    Acked-by: Pavel Machek
    Cc: Nigel Cunningham
    Cc: Russell King
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Andres Salomon
     

17 Oct, 2007

1 commit

  • e400b6ec4   vt/vgacon: Check if screen resize request comes from userspace ... Browse Code »

    Various console drivers are able to resize the screen via the con_resize()
    hook. This hook is also visible in userspace via the TIOCWINSZ, VT_RESIZE and
    VT_RESIZEX ioctl's. One particular utility, SVGATextMode, expects that
    con_resize() of the VGA console will always return success even if the
    resulting screen is not compatible with the hardware. However, this
    particular behavior of the VGA console, as reported in Kernel Bugzilla Bug
    7513, can cause undefined behavior if the user starts with a console size
    larger than 80x25.

    To work around this problem, add an extra parameter to con_resize(). This
    parameter is ignored by drivers except for vgacon. If this parameter is
    non-zero, then the resize request came from a VT_RESIZE or VT_RESIZEX ioctl
    and vgacon will always return success. If this parameter is zero, vgacon will
    return -EINVAL if the requested size is not compatible with the hardware. The
    latter is the more correct behavior.

    With this change, SVGATextMode should still work correctly while in-kernel and
    stty resize calls can expect correct behavior from vgacon.

    Signed-off-by: Antonino Daplas
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Antonino A. Daplas
     

17 Jul, 2007

2 commits

  • 0a3021f4e   Remove unnecessary includes of spinlock.h under include/linux ... Browse Code »

    Remove the obviously unnecessary includes of under the
    include/linux/ directory, and fix the couple errors that are introduced as
    a result of that.

    Signed-off-by: Robert P. J. Day
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Robert P. J. Day
     
  • 18a8bd949   serial: convert early_uart to earlycon for 8250 ... Browse Code »

    Beacuse SERIAL_PORT_DFNS is removed from include/asm-i386/serial.h and
    include/asm-x86_64/serial.h. the serial8250_ports need to be probed late in
    serial initializing stage. the console_init=>serial8250_console_init=>
    register_console=>serial8250_console_setup will return -ENDEV, and console
    ttyS0 can not be enabled at that time. need to wait till uart_add_one_port in
    drivers/serial/serial_core.c to call register_console to get console ttyS0.
    that is too late.

    Make early_uart to use early_param, so uart console can be used earlier. Make
    it to be bootconsole with CON_BOOT flag, so can use console handover feature.
    and it will switch to corresponding normal serial console automatically.

    new command line will be:
    console=uart8250,io,0x3f8,9600n8
    console=uart8250,mmio,0xff5e0000,115200n8
    or
    earlycon=uart8250,io,0x3f8,9600n8
    earlycon=uart8250,mmio,0xff5e0000,115200n8

    it will print in very early stage:
    Early serial console at I/O port 0x3f8 (options '9600n8')
    console [uart0] enabled
    later for console it will print:
    console handover: boot [uart0] -> real [ttyS0]

    Signed-off-by:
    Cc: Andi Kleen
    Cc: Bjorn Helgaas
    Cc: Russell King
    Cc: Gerd Hoffmann
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Yinghai Lu
     

09 May, 2007

2 commits

12 Feb, 2007

1 commit

03 Oct, 2006

1 commit

26 Sep, 2006

1 commit

27 Jun, 2006

1 commit

  • 3e795de76   [PATCH] VT binding: Add binding/unbinding support for the VT console ... Browse Code »

    The framebuffer console is now able to dynamically bind and unbind from the VT
    console layer. Due to the way the VT console layer works, the drivers
    themselves decide when to bind or unbind. However, it was decided that
    binding must be controlled, not by the drivers themselves, but by the VT
    console layer. With this, dynamic binding is possible for all VT console
    drivers, not just fbcon.

    Thus, the VT console layer will impose the following to all VT console
    drivers:

    - all registered VT console drivers will be entered in a private list
    - drivers can register themselves to the VT console layer, but they cannot
    decide when to bind or unbind. (Exception: To maintain backwards
    compatibility, take_over_console() will automatically bind the driver after
    registration.)
    - drivers can remove themselves from the list by unregistering from the VT
    console layer. A prerequisite for unregistration is that the driver must not
    be bound.

    The following functions are new in the vt.c:

    register_con_driver() - public function, this function adds the VT console
    driver to an internal list maintained by the VT console

    bind_con_driver() - private function, it binds the driver to the console

    take_over_console() is changed to call register_con_driver() followed by a
    bind_con_driver(). This is the only time drivers can decide when to bind to
    the VT layer. This is to maintain backwards compatibility.

    unbind_con_driver() - private function, it unbinds the driver from its
    console. The vacated consoles will be taken over by the default boot console
    driver.

    unregister_con_driver() - public function, removes the driver from the
    internal list maintained by the VT console. It will only succeed if the
    driver is currently unbound.

    con_is_bound() checks if the driver is currently bound or not

    give_up_console() is just a wrapper to unregister_con_driver().

    There are also 3 additional functions meant to be called only by the tty layer
    for sysfs control:

    vt_bind() - calls bind_con_driver()
    vt_unbind() - calls unbind_con_driver()
    vt_show_drivers() - shows the list of registered drivers

    Most VT console drivers will continue to work as is, but might have problems
    when unbinding or binding which should be fixable with minimal changes.

    Signed-off-by: Antonino Daplas
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Antonino A. Daplas
     

26 Jun, 2006

1 commit

  • 76a8ad293   [PATCH] Make printk work for really early debugging ... Browse Code »

    Currently printk is no use for early debugging because it refuses to
    actually print anything to the console unless
    cpu_online(smp_processor_id()) is true.

    The stated explanation is that console drivers may require per-cpu
    resources, or otherwise barf, because the system is not yet setup
    correctly. Fair enough.

    However some console drivers might be quite happy running early during
    boot, in fact we have one, and so it'd be nice if printk understood that.

    So I added a flag (which I would have called CON_BOOT, but that's taken)
    called CON_ANYTIME, which indicates that a console is happy to be called
    anytime, even if the cpu is not yet online.

    Tested on a Power 5 machine, with both a CON_ANYTIME driver and a bogus
    console driver that BUG()s if called while offline. No problems AFAICT.
    Built for i386 UP & SMP.

    Signed-off-by: Michael Ellerman
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Michael Ellerman
     

20 Jun, 2006

1 commit

17 Apr, 2005

1 commit

  • 1da177e4c   Linux-2.6.12-rc2 ... Browse Code »

    Initial git repository build. I'm not bothering with the full history,
    even though we have it. We can create a separate "historical" git
    archive of that later if we want to, and in the meantime it's about
    3.2GB when imported into git - space that would just make the early
    git days unnecessarily complicated, when we don't have a lot of good
    infrastructure for it.

    Let it rip!

    Linus Torvalds