[PATCH 07/12] drm/i915: Add bigjoiner and uncompressed joiner hw readout sanity checks

[Ankit Nautiyal]

From: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>

Adding sanity checks for primary and secondary bigjoiner/uncompressed
bitmasks, should make it easier to spot possible issues.

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 25 +++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 6ea018545eca..d6cd8d5a979d 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -3639,11 +3639,17 @@ static void enabled_bigjoiner_pipes(struct drm_i915_private *dev_priv,
 	}
 }
 
+static u8 expected_secondary_pipes(u8 primary_pipes)
+{
+	return primary_pipes << 1;
+}
+
 static void enabled_joiner_pipes(struct drm_i915_private *dev_priv,
 				 u8 *primary_pipes, u8 *secondary_pipes)
 {
 	u8 primary_uncompressed_joiner_pipes, primary_bigjoiner_pipes;
 	u8 secondary_uncompressed_joiner_pipes, secondary_bigjoiner_pipes;
+	u8 uncompressed_joiner_pipes, bigjoiner_pipes;
 
 	enabled_uncompressed_joiner_pipes(dev_priv, &primary_uncompressed_joiner_pipes,
 					  &secondary_uncompressed_joiner_pipes);
@@ -3651,11 +3657,28 @@ static void enabled_joiner_pipes(struct drm_i915_private *dev_priv,
 	enabled_bigjoiner_pipes(dev_priv, &primary_bigjoiner_pipes,
 				&secondary_bigjoiner_pipes);
 
+	uncompressed_joiner_pipes = primary_uncompressed_joiner_pipes |
+				    secondary_uncompressed_joiner_pipes;
+	bigjoiner_pipes = primary_bigjoiner_pipes | secondary_bigjoiner_pipes;
+
+	drm_WARN(&dev_priv->drm, (uncompressed_joiner_pipes & bigjoiner_pipes) != 0,
+		 "Uncomressed joiner pipes(%x) and bigjoiner pipes(%x) can't intersect\n",
+		 uncompressed_joiner_pipes, bigjoiner_pipes);
+	drm_WARN(&dev_priv->drm, secondary_bigjoiner_pipes !=
+		 expected_secondary_pipes(primary_bigjoiner_pipes),
+		 "Wrong secondary bigjoiner pipes(expected %x, current %x)\n",
+		 expected_secondary_pipes(primary_bigjoiner_pipes),
+		 secondary_bigjoiner_pipes);
+	drm_WARN(&dev_priv->drm, secondary_uncompressed_joiner_pipes !=
+		 expected_secondary_pipes(primary_uncompressed_joiner_pipes),
+		 "Wrong secondary uncompressed joiner pipes(expected %x, current %x)\n",
+		 expected_secondary_pipes(primary_uncompressed_joiner_pipes),
+		 secondary_uncompressed_joiner_pipes);
+
 	*primary_pipes = 0;
 	*secondary_pipes = 0;
 
 	*primary_pipes = primary_uncompressed_joiner_pipes | primary_bigjoiner_pipes;
-
 	*secondary_pipes = secondary_uncompressed_joiner_pipes | secondary_bigjoiner_pipes;
 }
 
-- 
2.45.2