[PATCH 80/81] drm/i915: rip out dp port enabling cludges^Wchecks

Daniel Vetter
2012-07-11T15:37:01Z

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
disable 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 disable
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.

Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
drivers/gpu/drm/i915/intel_dp.c | 16 ++++++++--------
1 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 68fe1dd..90b03e9 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1359,15 +1359,15 @@ static void intel_enable_dp(struct intel_encoder *encoder)
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);
}

@@ -1922,7 +1922,7 @@ intel_dp_link_down(struct intel_dp *intel_dp)
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");
--
1.7.7.6