From 1b39d6f37622f1da70aa2cfd38bfff9a52c13e05 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 6 Dec 2010 11:20:45 +0000 Subject: [PATCH] drm/i915/dp: Only apply the workaround if the select is still active As we may try to power down the link at various times, it is not necessarily still coupled with an encoder and so we must be careful not to depend upon an operation that is only valid when the link is still attached to a pipe. Fixes regression in 5bddd17. Reported-and-tested-by: Daniel Vetter Signed-off-by: Chris Wilson Cc: stable@kernel.org [after applying 5bddd17] --- drivers/gpu/drm/i915/intel_dp.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 1d8d068bc473..df648cb4c296 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1374,9 +1374,11 @@ intel_dp_link_down(struct intel_dp *intel_dp) { struct drm_device *dev = intel_dp->base.base.dev; struct drm_i915_private *dev_priv = dev->dev_private; - struct intel_crtc *intel_crtc = to_intel_crtc(intel_dp->base.base.crtc); uint32_t DP = intel_dp->DP; + if ((I915_READ(intel_dp->output_reg) & DP_PORT_EN) == 0) + return; + DRM_DEBUG_KMS("\n"); if (is_edp(intel_dp)) { @@ -1400,7 +1402,9 @@ intel_dp_link_down(struct intel_dp *intel_dp) if (is_edp(intel_dp)) DP |= DP_LINK_TRAIN_OFF; - if (!HAS_PCH_CPT(dev) && (DP & DP_PIPEB_SELECT)) { + if (!HAS_PCH_CPT(dev) && + I915_READ(intel_dp->output_reg) & DP_PIPEB_SELECT) { + struct intel_crtc *intel_crtc = to_intel_crtc(intel_dp->base.base.crtc); /* Hardware workaround: leaving our transcoder select * set to transcoder B while it's off will prevent the * corresponding HDMI output on transcoder A. -- 2.20.1