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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 <daniel.vetter@ffwll.ch>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org [after applying 5bddd17]
This commit is contained in:
Chris Wilson 2010-12-06 11:20:45 +00:00
parent 7a1948768c
commit 1b39d6f376
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/i915/intel_dp.c
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@ -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.