Eric Lee / smarc-fsl-linux-kernel

16 Oct, 2007

1 commit

  • 4ea241639   [ALSA] cs5535audio: drop unused bus master stuff ... Browse Code »

    We really only care about the first two bus masters (playback and capture).
    There's no need to have unused BM code lying around, so let's get rid of it.
    If for some reason we trigger an IRQ for some BM that we're not using.. well,
    that warrants spitting out an error message (imo).

    Signed-off-by: Andres Salomon
    Signed-off-by: Takashi Iwai
    Signed-off-by: Jaroslav Kysela

    Andres Salomon
     

20 Dec, 2006

1 commit

  • 437a5a460   [ALSA] Remove IRQF_DISABLED for shared PCI irqs ... Browse Code »

    Fix IRQ flags for PCI devices.
    The shared IRQs for PCI devices shouldn't be allocated with
    IRQF_DISABLED. Also, when MSI is enabled, IRQF_SHARED shouldn't
    be used.
    The patch removes unnecessary cast in request_irq and free_irq,
    too.

    Signed-off-by: Takashi Iwai
    Signed-off-by: Jaroslav Kysela

    Takashi Iwai
     

05 Oct, 2006

1 commit

  • 7d12e780e   IRQ: Maintain regs pointer globally rather than passing to IRQ handlers ... Browse Code »

    Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
    of passing regs around manually through all ~1800 interrupt handlers in the
    Linux kernel.

    The regs pointer is used in few places, but it potentially costs both stack
    space and code to pass it around. On the FRV arch, removing the regs parameter
    from all the genirq function results in a 20% speed up of the IRQ exit path
    (ie: from leaving timer_interrupt() to leaving do_IRQ()).

    Where appropriate, an arch may override the generic storage facility and do
    something different with the variable. On FRV, for instance, the address is
    maintained in GR28 at all times inside the kernel as part of general exception
    handling.

    Having looked over the code, it appears that the parameter may be handed down
    through up to twenty or so layers of functions. Consider a USB character
    device attached to a USB hub, attached to a USB controller that posts its
    interrupts through a cascaded auxiliary interrupt controller. A character
    device driver may want to pass regs to the sysrq handler through the input
    layer which adds another few layers of parameter passing.

    I've build this code with allyesconfig for x86_64 and i386. I've runtested the
    main part of the code on FRV and i386, though I can't test most of the drivers.
    I've also done partial conversion for powerpc and MIPS - these at least compile
    with minimal configurations.

    This will affect all archs. Mostly the changes should be relatively easy.
    Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

    struct pt_regs *old_regs = set_irq_regs(regs);

    And put the old one back at the end:

    set_irq_regs(old_regs);

    Don't pass regs through to generic_handle_irq() or __do_IRQ().

    In timer_interrupt(), this sort of change will be necessary:

    - update_process_times(user_mode(regs));
    - profile_tick(CPU_PROFILING, regs);
    + update_process_times(user_mode(get_irq_regs()));
    + profile_tick(CPU_PROFILING);

    I'd like to move update_process_times()'s use of get_irq_regs() into itself,
    except that i386, alone of the archs, uses something other than user_mode().

    Some notes on the interrupt handling in the drivers:

    (*) input_dev() is now gone entirely. The regs pointer is no longer stored in
    the input_dev struct.

    (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
    something different depending on whether it's been supplied with a regs
    pointer or not.

    (*) Various IRQ handler function pointers have been moved to type
    irq_handler_t.

    Signed-Off-By: David Howells
    (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)

    David Howells
     

13 Jul, 2006

1 commit

03 Jul, 2006

1 commit

23 Jun, 2006

5 commits

28 Apr, 2006

1 commit

22 Mar, 2006

1 commit

  • 1037593c8   [ALSA] CS5535: shorter delays when accessing AC'97 codec registers ... Browse Code »

    Modules: CS5535 driver

    The 10 ms sleeps while waiting for AC'97 codec register reads/writes to
    complete are excessive given the maxmium time is one AC'97 frame (~21 us).

    With AC'97 codecs with integrated touchscreens (like the UCB1400) this
    improves the interactive performance of the touchscreen.

    Signed-off-by: David Vrabel
    Signed-off-by: Takashi Iwai

    David Vrabel
     

22 Jan, 2006

1 commit

11 Jan, 2006

1 commit

  • e329113ca   [PATCH] i386: GPIO driver for AMD CS5535/CS5536 ... Browse Code »

    A simple driver for the CS5535 and CS5536 that allows a user-space program
    to manipulate GPIO pins. The CS5535/CS5536 chips are Geode processor
    companion devices.

    Signed-off-by: Ben Gardner
    Signed-off-by: Richard Knutsson
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Ben Gardner
     

03 Jan, 2006

4 commits