iwlwifi: pcie: retrieve and parse ACPI power limitations
authorIdo Yariv <ido@wizery.com>
Fri, 17 Jan 2014 02:00:11 +0000 (21:00 -0500)
committerEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Mon, 3 Feb 2014 20:23:38 +0000 (22:23 +0200)
commitbcb079a14d75b6e1ed762b194fe04dc5d3f96d7e
tree2d0b7634b195fbc301666bc59fd97f141cd5cebf
parent7b4fe06c25a1a37ba393e791012f3b01c70e674a
iwlwifi: pcie: retrieve and parse ACPI power limitations

Some platforms may have power limitations on PCIe cards connected to
specific root ports.

This information is encoded as part of the ACPI tables, for instance:
<snip>
           Name (SPLX, Package (0x02)
           {
               Zero,
               Package (0x03)
               {
                   0x07,
                   0x00000500,
                   0x80000000
               }
           })

           Method (SPLC, 0, Serialized)
           {
               Return (SPLX)
           }
</snip>

The structure returned contains the domain type, the default power
limitation and the default time window (reserved for future use).

Upon PCI probing, call the relevant ACPI method, parse the returned
structure, and save the power limitation.

Signed-off-by: Ido Yariv <idox.yariv@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
drivers/net/wireless/iwlwifi/iwl-trans.h
drivers/net/wireless/iwlwifi/pcie/drv.c