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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
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>
-rw-r--r--drivers/gpu/drm/drm_crtc_helper.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 3963b3c1081..4231d6db72e 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -1020,6 +1020,9 @@ bool drm_helper_initial_config(struct drm_device *dev)
{
int count = 0;
+ /* disable all the possible outputs/crtcs before entering KMS mode */
+ drm_helper_disable_unused_functions(dev);
+
drm_fb_helper_parse_command_line(dev);
count = drm_helper_probe_connector_modes(dev,