• Rafal Bilski's avatar
    Longhaul: add auto enabled "revid_errata" option · 52a2638b
    Rafal Bilski authored
    VIA C3 Ezra-T has RevisionID equal to 1, but it needs RevisionKey to be 0
    or CPU will ignore new frequency and will continue to work at old
    frequency.  New "revid_errata" option will force RevisionKey to be set to
    0, whatever RevisionID is.
    
    Additionaly "Longhaul" will not silently ignore unsuccessful transition.
    It will try to check if "revid_errata" or "disable_acpi_c3" options need to
    be enabled for this processor/system.
    
    Same for Longhaul ver.  2 support.  It will be disabled if none of above
    options will work.
    
     Best case scenario (with patch apllied and v2 enabled):
     longhaul: VIA C3 'Ezra' [C5C] CPU detected.  Longhaul v2 supported.
     longhaul: Using northbridge support.
     longhaul: VRM 8.5
     longhaul: Max VID=1.350  Min VID=1.050, 13 possible voltage scales
     longhaul: f: 300000 kHz, index: 0, vid: 1050 mV
     [...]
     longhaul: Voltage scaling enabled.
     Worst case scenario:
     longhaul: VIA C3 'Ezra-T' [C5M] CPU detected.  Powersaver supported.
     longhaul: Using northbridge support.
     longhaul: Using ACPI support.
     longhaul: VRM 8.5
     longhaul: Claims to support voltage scaling but min & max are both 1.250. Voltage scaling disabled
     longhaul: Failed to set requested frequency!
     longhaul: Enabling "Ignore Revision ID" option.
     longhaul: Failed to set requested frequency!
     longhaul: Disabling ACPI C3 support.
     longhaul: Disabling "Ignore Revision ID" option.
     longhaul: Failed to set requested frequency!
     longhaul: Enabling "Ignore Revision ID" option.
    
    [akpm@linux-foundation.org: coding-style cleanups]
    Signed-off-by: default avatarRafal Bilski <rafalbilski@interia.pl>
    Signed-off-by: default avatarDave Jones <davej@redhat.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    52a2638b
longhaul.c 26.3 KB