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@xxxxxxxxxxxxxxx>
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 6 ++++++
drivers/gpu/drm/i915/intel_display.c | 19 +++++++++++++++++++
2 files changed, 25 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 02af9b5add34..9962dcb475d4 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5699,6 +5699,12 @@ 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 f0b480fba980..cc19b276f2c1 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3894,6 +3894,16 @@ 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)
@@ -15399,6 +15409,15 @@ 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
--
2.14.5
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