[Intel-gfx] [PATCH 2/2] drm/i915/fbc: fix FBC_COMPRESSION_MASK on BDW+

[Paulo Zanoni]

Its size is 11:0 instead of 10:0. Found by inspecting the spec. I'm
not aware of any real-world IGT failures caused by this.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 10 ++++++----
 drivers/gpu/drm/i915/i915_reg.h     |  5 +++--
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index dc057c7..b54ff40 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1674,11 +1674,13 @@ static int i915_fbc_status(struct seq_file *m, void *unused)
 		seq_printf(m, "FBC disabled: %s\n",
 			   dev_priv->fbc.no_fbc_reason);
 
-	if (intel_fbc_is_active(dev_priv) &&
-	    INTEL_GEN(dev_priv) >= 7)
+	if (intel_fbc_is_active(dev_priv) && INTEL_GEN(dev_priv) >= 7) {
+		uint32_t mask = INTEL_GEN(dev_priv) >= 8 ?
+				BDW_FBC_COMPRESSION_MASK :
+				IVB_FBC_COMPRESSION_MASK;
 		seq_printf(m, "Compressing: %s\n",
-			   yesno(I915_READ(FBC_STATUS2) &
-				 FBC_COMPRESSION_MASK));
+			   yesno(I915_READ(FBC_STATUS2) & mask));
+	}
 
 	mutex_unlock(&dev_priv->fbc.lock);
 	intel_runtime_pm_put(dev_priv);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 00efaa1..a9be3f0 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2188,8 +2188,9 @@ enum skl_disp_power_wells {
 #define FBC_FENCE_OFF		_MMIO(0x3218) /* BSpec typo has 321Bh */
 #define FBC_TAG(i)		_MMIO(0x3300 + (i) * 4)
 
-#define FBC_STATUS2		_MMIO(0x43214)
-#define  FBC_COMPRESSION_MASK	0x7ff
+#define FBC_STATUS2			_MMIO(0x43214)
+#define  IVB_FBC_COMPRESSION_MASK	0x7ff
+#define  BDW_FBC_COMPRESSION_MASK	0xfff
 
 #define FBC_LL_SIZE		(1536)
 
-- 
2.7.4