Eric Lee / smarc-fsl-linux-kernel

21 Apr, 2012

1 commit

  • 19244ad06   Revert "ACPI: ignore FADT reset-reg-sup flag" ... Browse Code »

    This reverts commit cf450136bfde77c7f95065c91bffded4aa7fa731.

    It breaks reboot on at least one Thinkpad T43, as reported by Jörg Otte:
    "On reboot it shuts down as normal.
    The last lines displayed are:

    >Unmounting temporary filesystems.. [OK]
    >Deactivating swap... [OK]
    >Unmounting local filesystems... [OK]
    >Will now restart
    > Restarting system

    Then I hear it accessing the cd-drive, but then it's being stuck."

    Jörg bisected the regression to this commit.

    That commit fixes another machine (see

    https://bugzilla.kernel.org/show_bug.cgi?id=11533

    for details) that has a BIOS bug and doesn't support ACPI reset.
    However, at least one of those other reporters no longer even has the
    machine in question, and had a different workaround to begin with.
    Besides, it clearly was a buggy BIOS. Let's not break the correct case
    to fix that case.

    Reported-and-bisected-by: Jörg Otte
    Cc: linux-acpi@vger.kernel.org
    Cc: Len Brown
    Cc: Peter Anvin
    Signed-off-by: Linus Torvalds

    Linus Torvalds
     

21 Mar, 2012

1 commit

23 Mar, 2011

2 commits

31 Dec, 2008

2 commits

  • 2ee626124   ACPI: reboot.c: use new acpi_reset interface ... Browse Code »

    Use new acpi_reset interface to write to reset register

    Signed-off-by: Lin Ming
    Signed-off-by: Len Brown

    Lin Ming
     
  • ecfbbc7b4   ACPICA: New: acpi_read and acpi_write public interfaces ... Browse Code »

    Changed the acpi_hw_low_level_read and acpi_hw_low_level_write functions to
    the public acpi_read and acpi_write to allow direct access to
    ACPI registers. Removed the "width" parameter since the width
    can be obtained from the input GAS structure. Updated the FADT
    initialization to setup the GAS structures with the proper
    widths. Some widths are still hardcoded because many FADTs have
    incorrect register lengths.

    Signed-off-by: Bob Moore
    Signed-off-by: Len Brown

    Bob Moore
     

07 Nov, 2008

1 commit

18 Oct, 2008

1 commit

  • 8fd145917   ACPI: Ingore the RESET_REG_SUP bit when using ACPI reset mechanism ... Browse Code »

    According to ACPI 3.0, FADT.flags.RESET_REG_SUP indicates
    whether the ACPI reboot mechanism is supported.

    However, some boxes have this bit clear, have a valid
    ACPI_RESET_REG & RESET_VALUE, and ACPI reboot is the only
    mechanism that works for them after S3.

    This suggests that other operating systems may not be checking
    the RESET_REG_SUP bit, and are using other means to decide
    whether to use the ACPI reboot mechanism or not.

    Here we stop checking RESET_REG_SUP.
    Instead, When acpi reboot is requested,
    only the reset_register is checked. If the following
    conditions are met, it indicates that the reset register is supported.
    a. reset_register is not zero
    b. the access width is eight
    c. the bit_offset is zero

    http://bugzilla.kernel.org/show_bug.cgi?id=7299
    http://bugzilla.kernel.org/show_bug.cgi?id=1148

    Signed-off-by: Zhao Yakui
    Signed-off-by: Len Brown

    Zhao Yakui
     

17 Jul, 2008

1 commit