[Intel-gfx] [PATCH 05/10] drm/i915: Use 1/2 compression ratio limit for 16bpp on FBC2

[ville . syrjala]

From: Ville Syrjälä <ville.syrj...@linux.intel.com>

Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index c6e047e..a7af5b4 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -155,7 +155,11 @@ static void g4x_enable_fbc(struct drm_crtc *crtc)
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        u32 dpfc_ctl;
 
-       dpfc_ctl = DPFC_CTL_PLANE(intel_crtc->plane) | DPFC_SR_EN | 
DPFC_CTL_LIMIT_1X;
+       dpfc_ctl = DPFC_CTL_PLANE(intel_crtc->plane) | DPFC_SR_EN;
+       if (drm_format_plane_cpp(fb->pixel_format, 0) == 2)
+               dpfc_ctl |= DPFC_CTL_LIMIT_2X;
+       else
+               dpfc_ctl |= DPFC_CTL_LIMIT_1X;
        dpfc_ctl |= DPFC_CTL_FENCE_EN | obj->fence_reg;
 
        I915_WRITE(DPFC_FENCE_YOFF, crtc->y);
@@ -225,7 +229,11 @@ static void ironlake_enable_fbc(struct drm_crtc *crtc)
 
        dpfc_ctl = I915_READ(ILK_DPFC_CONTROL);
        dpfc_ctl &= DPFC_RESERVED;
-       dpfc_ctl |= DPFC_CTL_PLANE(intel_crtc->plane) | DPFC_CTL_LIMIT_1X;
+       dpfc_ctl |= DPFC_CTL_PLANE(intel_crtc->plane);
+       if (drm_format_plane_cpp(fb->pixel_format, 0) == 2)
+               dpfc_ctl |= DPFC_CTL_LIMIT_2X;
+       else
+               dpfc_ctl |= DPFC_CTL_LIMIT_1X;
        dpfc_ctl |= DPFC_CTL_FENCE_EN;
        if (IS_GEN5(dev))
                dpfc_ctl |= obj->fence_reg;
@@ -275,10 +283,16 @@ static void gen7_enable_fbc(struct drm_crtc *crtc)
        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
        struct drm_i915_gem_object *obj = intel_fb->obj;
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+       u32 dpfc_ctl;
 
-       I915_WRITE(ILK_DPFC_CONTROL, DPFC_CTL_EN | DPFC_CTL_LIMIT_1X |
-                  IVB_DPFC_CTL_FENCE_EN |
-                  IVB_DPFC_CTL_PLANE(intel_crtc->plane));
+       dpfc_ctl = IVB_DPFC_CTL_PLANE(intel_crtc->plane);
+       if (drm_format_plane_cpp(fb->pixel_format, 0) == 2)
+               dpfc_ctl |= DPFC_CTL_LIMIT_2X;
+       else
+               dpfc_ctl |= DPFC_CTL_LIMIT_1X;
+       dpfc_ctl |= IVB_DPFC_CTL_FENCE_EN;
+
+       I915_WRITE(ILK_DPFC_CONTROL, dpfc_ctl | DPFC_CTL_EN);
 
        if (IS_IVYBRIDGE(dev)) {
                /* WaFbcAsynchFlipDisableFbcQueue:ivb */
-- 
1.8.3.2

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