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authorZhao Yakui <yakui.zhao@intel.com>2009-12-09 11:23:42 +0800
committerDave Airlie <airlied@redhat.com>2009-12-09 13:28:07 +1000
commitb16d9acbdb97452d1418420e069acf7381ef10bb (patch)
treef483f41167a02e0f660bfcbfd828c7d186a90d3a /Documentation/irqflags-tracing.txt
parent7b0a9e8302522d5f7bb7fab6b8a3c8ce8181609c (diff)
drm: disable all the possible outputs/crtcs before entering KMS mode
Sometimes we will use a crtc for integerated LVDS, which is different with that assigned by BIOS. If we want to get flicker-free transitions, then we could read out the current state for it and set our current state accordingly. But it is true that if we aren't reading current state out, we do need to turn everything off before modesetting. Otherwise the clocks can get very angry and we get things worse than a flicker at boot. In fact we also do the similar thing in UMS mode. We will disable all the possible outputs/crtcs for the first modesetting. So we disable all the possible outputs/crtcs before entering the KMS mode. Before we configure connector/encoder/crtc, the function of drm_helper_disable_unused_function can disable all the possible outputs/crtcs. Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Rafal Milecki <zajec5@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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