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    • Lv Zheng's avatar
      dcf15cbd
      ACPI / EC: Fix a boot EC regresion by restoring boot EC support for the DSDT EC · dcf15cbd
      Lv Zheng authored
      According to the Windows probing result, during the table loading, the EC
      device described in the ECDT should be used. And the ECDT EC is also
      effective during the period the namespace objects are initialized (we can
      see a separate process executing _STA/_INI on Windows before executing
      other device specific control methods, for example, EC._REG). During the
      device enumration, the EC device described in the DSDT should be used. But
      there are differences between Linux and Windows around the device probing
      order. Thus in Linux, we should enable the DSDT EC as early as possible
      before enumerating devices in order not to trigger issues related to the
      device enumeration order differences.
      
      This patch thus converts acpi_boot_ec_enable() into acpi_ec_dsdt_probe() to
      fix the gap. This also fixes a user reported regression triggered after we
      switched the "table loading"/"ECDT support" to be ACPI spec 2.0 compliant.
      
      Fixes: 59f0aa94 (ACPI 2.0 / ECDT: Remove early namespace reference from EC)
      Link: https://bugzilla.kernel.org/show_bug.cgi?id=119261
      
      
      Reported-and-tested-by: default avatarGabriele Mazzotta <gabriele.mzt@gmail.com>
      Signed-off-by: default avatarLv Zheng <lv.zheng@intel.com>
      Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      dcf15cbd
      History
      ACPI / EC: Fix a boot EC regresion by restoring boot EC support for the DSDT EC
      Lv Zheng authored
      According to the Windows probing result, during the table loading, the EC
      device described in the ECDT should be used. And the ECDT EC is also
      effective during the period the namespace objects are initialized (we can
      see a separate process executing _STA/_INI on Windows before executing
      other device specific control methods, for example, EC._REG). During the
      device enumration, the EC device described in the DSDT should be used. But
      there are differences between Linux and Windows around the device probing
      order. Thus in Linux, we should enable the DSDT EC as early as possible
      before enumerating devices in order not to trigger issues related to the
      device enumeration order differences.
      
      This patch thus converts acpi_boot_ec_enable() into acpi_ec_dsdt_probe() to
      fix the gap. This also fixes a user reported regression triggered after we
      switched the "table loading"/"ECDT support" to be ACPI spec 2.0 compliant.
      
      Fixes: 59f0aa94 (ACPI 2.0 / ECDT: Remove early namespace reference from EC)
      Link: https://bugzilla.kernel.org/show_bug.cgi?id=119261
      
      
      Reported-and-tested-by: default avatarGabriele Mazzotta <gabriele.mzt@gmail.com>
      Signed-off-by: default avatarLv Zheng <lv.zheng@intel.com>
      Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    motorola_pgalloc.h 2.22 KiB