Eric Lee / smarc-fsl-linux-kernel

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
     

03 Jul, 2006

1 commit

01 Jul, 2006

1 commit

28 Jun, 2006

1 commit

23 Jun, 2006

2 commits

22 Mar, 2006

1 commit

02 Feb, 2006

1 commit

  • f27f218cd   [ARM] 3290/1: Fix the FIFO size detection ... Browse Code »

    Patch from Catalin Marinas

    AACI reports TX FIFO full after the first write to it if the AC97 is not
    enabled. This patch enables the AC97 probing before the check for the TX
    FIFO size. The patch also adds a warning if the TX FIFO size is not
    multiple of 16.

    Signed-off-by: Catalin Marinas
    Signed-off-by: Russell King

    Catalin Marinas
     

07 Jan, 2006

2 commits

03 Jan, 2006

9 commits

10 Nov, 2005

1 commit

30 Oct, 2005

1 commit

29 Oct, 2005

2 commits

  • 6fbfddcb5   Merge ../bleed-2.6 Browse Code »
    Greg KH
     
  • 9480e307c   [PATCH] DRIVER MODEL: Get rid of the obsolete tri-level suspend/resume callbacks ... Browse Code »

    In PM v1, all devices were called at SUSPEND_DISABLE level. Then
    all devices were called at SUSPEND_SAVE_STATE level, and finally
    SUSPEND_POWER_DOWN level. However, with PM v2, to maintain
    compatibility for platform devices, I arranged for the PM v2
    suspend/resume callbacks to call the old PM v1 suspend/resume
    callbacks three times with each level in order so that existing
    drivers continued to work.

    Since this is obsolete infrastructure which is no longer necessary,
    we can remove it. Here's an (untested) patch to do exactly that.

    Signed-off-by: Russell King
    Signed-off-by: Greg Kroah-Hartman

    Russell King
     

28 Oct, 2005

1 commit

07 Oct, 2005

1 commit

18 Sep, 2005

1 commit

12 Sep, 2005

3 commits

  • 561b220a4   [ALSA] Replace with kzalloc() - others ... Browse Code »

    Documentation,SA11xx UDA1341 driver,Generic drivers,MPU401 UART,OPL3
    OPL4,Digigram VX core,I2C cs8427,I2C lib core,I2C tea6330t,L3 drivers
    AK4114 receiver,AK4117 receiver,PDAudioCF driver,PPC PMAC driver
    SPARC AMD7930 driver,SPARC cs4231 driver,Synth,Common EMU synth
    USB generic driver,USB USX2Y
    Replace kcalloc(1,..) with kzalloc().

    Signed-off-by: Takashi Iwai

    Takashi Iwai
     
  • 16dab54b8   [ALSA] Add snd_card_set_generic_dev() call ... Browse Code »

    ARM,SA11xx UDA1341 driver,Generic drivers,MPU401 UART,MIPS
    MIPS AU1x00 driver,PPC,PPC PowerMac driver,SPARC,SPARC AMD7930 driver
    SPARC cs4231 driver,SPARC DBRI driver
    - Added snd_card_set_generic_dev() call.
    - Added SND_GENERIC_DRIVER to Kconfig.
    - Clean up the error path in probe if necessary.

    Signed-off-by: Takashi Iwai

    Takashi Iwai
     
  • a76af199d   [ALSA] Add snd_card_set_dev() ... Browse Code »

    ARM AACI PL041 driver,PARISC Harmony driver
    Added snd_card_set_dev() calls to register the device pointer for the card.

    Signed-off-by: Takashi Iwai

    Takashi Iwai
     

08 Sep, 2005

2 commits

30 Aug, 2005

2 commits

  • a55bfdc58   [ALSA] Fix compiler warnings in PXA2XX-AC97 ... Browse Code »

    ARM PXA2XX driver
    - change pxa2xx_ac97_do_suspend and pxa2xx_ac97_do_resume to use
    the expected arguments

    Signed-off-by: Dirk Opfer
    Signed-off-by: Takashi Iwai

    Dirk Opfer
     
  • 4a677ac5d   [ALSA] PXA27x AC97 warm reset ... Browse Code »

    ARM PXA2XX driver
    This patch extends the period of an AC97 warm reset on the PXA27x from
    50uS to 500uS. The shorter reset didn't always guarantee that the codec
    would wake up.

    Changes:-

    o Change pxa27x warm reset period to 500uS
    o Removed double semi-colon.

    Signed-off-by: Liam Girdwood
    Signed-off-by: Takashi Iwai

    Liam Girdwood
     

28 Jul, 2005

1 commit

29 May, 2005

2 commits

  • cb5a6ffc5   [ALSA] ARM AACI primecell driver ... Browse Code »

    ARM,/arm/Makefile,ARM AACI PL041 driver
    Add support for the ARM AACI Primecell, which provides an AC'97
    based interface. This driver only provides playback support.

    This has been extensively tested with an LM4549 AC'97 codec.

    Signed-off-by: Russell King
    Signed-off-by: Takashi Iwai

    Russell King
     
  • 9b9a5afff   [ALSA] ARM DMA subsystem ... Browse Code »

    ARM DMA routines
    The patch below adds a convenient re-usable shim around the extended
    ARM DMA API, and is used by several ARM ALSA drivers.

    Signed-off-by: Russell King
    Signed-off-by: Takashi Iwai

    Russell King
     

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