drm/i915: Force background color to black for gen9+ (v2)

We don't yet allow userspace to control the CRTC background color, but
we should manually program the color to black to ensure the BIOS didn't
leave us with some other color.  We should also set the pipe gamma and
pipe CSC bits so that the background color goes through the same color
management transformations that a plane with black pixels would.

v2: Rename register to SKL_BOTTOM_COLOR to more closely follow
    bspec naming.  (Ville)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190130185122.10322-2-matthew.d.roper@intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 03adcf3..a64deeb 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5710,6 +5710,12 @@ enum {
 #define   PIPEMISC_DITHER_TYPE_SP      (0 << 2)
 #define PIPEMISC(pipe)                 _MMIO_PIPE2(pipe, _PIPE_MISC_A)
 
+/* Skylake+ pipe bottom (background) color */
+#define _SKL_BOTTOM_COLOR_A            0x70034
+#define   SKL_BOTTOM_COLOR_GAMMA_ENABLE        (1 << 31)
+#define   SKL_BOTTOM_COLOR_CSC_ENABLE  (1 << 30)
+#define SKL_BOTTOM_COLOR(pipe)         _MMIO_PIPE2(pipe, _SKL_BOTTOM_COLOR_A)
+
 #define VLV_DPFLIPSTAT                         _MMIO(VLV_DISPLAY_BASE + 0x70028)
 #define   PIPEB_LINE_COMPARE_INT_EN            (1 << 29)
 #define   PIPEB_HLINE_INT_EN                   (1 << 28)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index efd1683..b0bb8ad 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3930,6 +3930,16 @@ static void intel_update_pipe_config(const struct intel_crtc_state *old_crtc_sta
                else if (old_crtc_state->pch_pfit.enabled)
                        ironlake_pfit_disable(old_crtc_state);
        }
+
+       /*
+        * We don't (yet) allow userspace to control the pipe background color,
+        * so force it to black, but apply pipe gamma and CSC so that its
+        * handling will match how we program our planes.
+        */
+       if (INTEL_GEN(dev_priv) >= 9)
+               I915_WRITE(SKL_BOTTOM_COLOR(crtc->pipe),
+                          SKL_BOTTOM_COLOR_GAMMA_ENABLE |
+                          SKL_BOTTOM_COLOR_CSC_ENABLE);
 }
 
 static void intel_fdi_normal_train(struct intel_crtc *crtc)
@@ -15488,6 +15498,15 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc,
                            plane->base.type != DRM_PLANE_TYPE_PRIMARY)
                                intel_plane_disable_noatomic(crtc, plane);
                }
+
+               /*
+                * Disable any background color set by the BIOS, but enable the
+                * gamma and CSC to match how we program our planes.
+                */
+               if (INTEL_GEN(dev_priv) >= 9)
+                       I915_WRITE(SKL_BOTTOM_COLOR(crtc->pipe),
+                                  SKL_BOTTOM_COLOR_GAMMA_ENABLE |
+                                  SKL_BOTTOM_COLOR_CSC_ENABLE);
        }
 
        /* Adjust the state of the output pipe according to whether we