• Jesse Barnes's avatar
    DRM: i915: add mode setting support · 79e53945
    Jesse Barnes authored
    This commit adds i915 driver support for the DRM mode setting APIs.
    Currently, VGA, LVDS, SDVO DVI & VGA, TV and DVO LVDS outputs are
    supported.  HDMI, DisplayPort and additional SDVO output support will
    follow.
    
    Support for the mode setting code is controlled by the new 'modeset'
    module option.  A new config option, CONFIG_DRM_I915_KMS controls the
    default behavior, and whether a PCI ID list is built into the module for
    use by user level module utilities.
    
    Note that if mode setting is enabled, user level drivers that access
    display registers directly or that don't use the kernel graphics memory
    manager will likely corrupt kernel graphics memory, disrupt output
    configuration (possibly leading to hangs and/or blank displays), and
    prevent panic/oops messages from appearing.  So use caution when
    enabling this code; be sure your user level code supports the new
    interfaces.
    
    A new SysRq key, 'g', provides emergency support for switching back to
    the kernel's framebuffer console; which is useful for testing.
    
    Co-authors: Dave Airlie <airlied@linux.ie>, Hong Liu <hong.liu@intel.com>
    Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
    Signed-off-by: default avatarEric Anholt <eric@anholt.net>
    Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
    79e53945
i915_irq.c 15.5 KB