drm/i915: make the panel fitter work on pipes B and C on IVB

I actually found this problem on Haswell, but then discovered Ivy
Bridge also has it by reading the spec.

I don't have the hardware to test this.

Cc: stable@vger.kernel.org
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 7 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 5aba146300d3..97fbd9d1823b 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3339,6 +3339,8 @@
 #define _PFA_CTL_1               0x68080
 #define _PFB_CTL_1               0x68880
 #define  PF_ENABLE              (1<<31)
+#define  PF_PIPE_SEL_MASK_IVB   (3<<29)
+#define  PF_PIPE_SEL_IVB(pipe)  ((pipe)<<29)
 #define  PF_FILTER_MASK         (3<<23)
 #define  PF_FILTER_PROGRAMMED   (0<<23)
 #define  PF_FILTER_MED_3x3      (1<<23)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e233541d4c9f..c2ef6cdf66c3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3387,7 +3387,11 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc)
                  * as some pre-programmed values are broken,
                  * e.g. x201.
                  */
-                I915_WRITE(PF_CTL(pipe), PF_ENABLE | PF_FILTER_MED_3x3);
+                if (IS_IVYBRIDGE(dev))
+                        I915_WRITE(PF_CTL(pipe), PF_ENABLE | PF_FILTER_MED_3x3 |
+                                                 PF_PIPE_SEL_IVB(pipe));
+                else
+                        I915_WRITE(PF_CTL(pipe), PF_ENABLE | PF_FILTER_MED_3x3);
                 I915_WRITE(PF_WIN_POS(pipe), dev_priv->pch_pf_pos);
                 I915_WRITE(PF_WIN_SZ(pipe), dev_priv->pch_pf_size);
         }