[PATCH 3/4] drm/i915: add panel lock assertion function

[Jesse Barnes <jbarnes@virtuousgeek.org>]

When PLLs or timing regs are changed, we need to make sure the panel
lock will allow it.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
 drivers/gpu/drm/i915/intel_display.c |   29 +++++++++++++++++++++++++++++
 1 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 800514d..159cf7b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1086,6 +1086,35 @@ static void assert_pll(struct drm_i915_private *dev_priv, enum pipe pipe,
 #define assert_pll_enabled(d, p) assert_pll(d, p, on)
 #define assert_pll_disabled(d, p) assert_pll(d, p, off)
 
+static void assert_panel_unlocked(struct drm_i915_private *dev_priv,
+				  enum pipe pipe)
+{
+	int pp_reg, lvds_reg;
+	u32 val;
+	enum pipe panel_pipe = PIPE_A;
+	bool locked = locked;
+
+	if (HAS_PCH_SPLIT(dev_priv->dev)) {
+		pp_reg = PCH_PP_CONTROL;
+		lvds_reg = PCH_LVDS;
+	} else {
+		pp_reg = PP_CONTROL;
+		lvds_reg = LVDS;
+	}
+
+	val = I915_READ(pp_reg);
+	if (!(val & PANEL_POWER_ON) ||
+	    ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS))
+		locked = false;
+
+	if (I915_READ(lvds_reg) & LVDS_PIPEB_SELECT)
+		panel_pipe = PIPE_B;
+
+	WARN(panel_pipe == pipe && locked,
+	     "panel assertion failure, pipe %c regs locked\n",
+	     pipe ? 'B' : 'A');
+}
+
 static void assert_pipe_enabled(struct drm_i915_private *dev_priv,
 				enum pipe pipe)
 {
-- 
1.7.0.4