From 3739850b46f560a2be29287c3e5c29999d1a7e0e Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Thu, 6 Sep 2012 22:15:44 +0200 Subject: [PATCH] drm/i915: disable the cpu edp port after the cpu pipe See bspec, Vol3 Part2, Section 1.1.3 "Display Mode Set Sequence". This applies to all platforms where we currently support eDP on, i.e. ilk, snb & ivb. Without this change we fail to light up the eDP port on previously unused crtcs (likely because something is stuck on the old pipe), and we also fail to properly disable the old pipe (i.e. bit 30 in the PIPECONF register is stuck as set until the next reboot). v2: Rebased on top of the edp panel off sequence changes in 3.6-rc2. Reviewed-by: Paulo Zanoni Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=44001 Signed-Off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_dp.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 8a70df0c32bb..a48c0260a9b0 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1315,15 +1315,20 @@ static void intel_disable_dp(struct intel_encoder *encoder) ironlake_edp_backlight_off(intel_dp); intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON); ironlake_edp_panel_off(intel_dp); - intel_dp_link_down(intel_dp); + + /* cpu edp my only be disable _after_ the cpu pipe/plane is disabled. */ + if (!is_cpu_edp(intel_dp)) + intel_dp_link_down(intel_dp); } static void intel_post_disable_dp(struct intel_encoder *encoder) { struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base); - if (is_cpu_edp(intel_dp)) + if (is_cpu_edp(intel_dp)) { + intel_dp_link_down(intel_dp); ironlake_edp_pll_off(intel_dp); + } } static void intel_enable_dp(struct intel_encoder *encoder) -- 2.11.0