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

commit 13888d78c664a1f61d7b09d282f5916993827a40 upstream.

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.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index a4162ddff6c5e0e38c3c7b298aa4806d02bcb992..09ae4b0a4785e4e9e498cc2ad63329c4dacf8e74 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3315,6 +3315,8 @@
 #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 b426d44a2b055d5a8afb31a0ba4bc9fd40ea0554..71f9b5de04177af198edda99cbcb9e01a6079828 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3225,7 +3225,11 @@ 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);
        }