drm/i915: rip out dp port enabling cludges^Wchecks
These have been added because dp links are fiddle things and don't
like it when we try to re-train an enabled output (or disable a
disabled output harder). And because the crtc helper code is
ridiculously bad add tracking the modeset state.
But with the new code in place it is simply a bug to disable a disabled
encoder or to enable an enabled encoder again. Hence convert these to
WARNs (and bail out for safety), but flatten all conditionals in the
code itself.
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 0f84800..8a70df0 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1333,15 +1333,15 @@
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t dp_reg = I915_READ(intel_dp->output_reg);
+ if (WARN_ON(dp_reg & DP_PORT_EN))
+ return;
+
ironlake_edp_panel_vdd_on(intel_dp);
intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
- if (!(dp_reg & DP_PORT_EN)) {
- intel_dp_start_link_train(intel_dp);
- ironlake_edp_panel_on(intel_dp);
- ironlake_edp_panel_vdd_off(intel_dp, true);
- intel_dp_complete_link_train(intel_dp);
- } else
- ironlake_edp_panel_vdd_off(intel_dp, false);
+ intel_dp_start_link_train(intel_dp);
+ ironlake_edp_panel_on(intel_dp);
+ ironlake_edp_panel_vdd_off(intel_dp, true);
+ intel_dp_complete_link_train(intel_dp);
ironlake_edp_backlight_on(intel_dp);
}
@@ -1900,7 +1900,7 @@
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t DP = intel_dp->DP;
- if ((I915_READ(intel_dp->output_reg) & DP_PORT_EN) == 0)
+ if (WARN_ON((I915_READ(intel_dp->output_reg) & DP_PORT_EN) == 0))
return;
DRM_DEBUG_KMS("\n");