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authorKenji Kaneshige2008-11-10 13:54:43 +0900
committerJesse Barnes2008-11-11 13:33:05 -0800
commit2485b8674bf5762822e14e1554938e36511c0ae4 (patch)
tree9594d7366d234f9b23c33da9b087c120562b0070 /init
parentf21f237cf55494c3a4209de323281a3b0528da10 (diff)
PCI: ignore bit0 of _OSC return code
Currently acpi_run_osc() checks all the bits in _OSC result code (the first DWORD in the capabilities buffer) to see error condition. But the bit 0, which doesn't indicate any error, must be ignored. The bit 0 is used as the query flag at _OSC invocation time. Some platforms clear it during _OSC evaluation, but the others don't. On latter platforms, current acpi_run_osc() mis-detects error when _OSC is evaluated with query flag set because it doesn't ignore the bit 0. Because of this, the __acpi_query_osc() always fails on such platforms. And this is the cause of the problem that pci_osc_control_set() doesn't work since the commit 4e39432f4df544d3dfe4fc90a22d87de64d15815 which changed pci_osc_control_set() to use __acpi_query_osc(). Tested-by:"Tomasz Czernecki <czernecki@gmail.com> Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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