[Intel-gfx] [PATCH 06/10] drm/i915: Extract glk_color_check()

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Unlike the earlier platforms GLK has dedicated degamma and gamma
LUTs. And quite curiously the degamma LUT is actually controlled
via the PLANE_COLOR_CTL CSC enable bit. Hence we must compute
gamma_enable and csc_enable differently to pre-GLK platforms.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_color.c | 40 ++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index 86580541b0da..e2a1c823650b 100644
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -871,6 +871,44 @@ static int chv_color_check(struct intel_crtc_state *crtc_state)
 	return 0;
 }
 
+static u32 glk_gamma_mode(const struct intel_crtc_state *crtc_state)
+{
+	if (!crtc_state->gamma_enable ||
+	    crtc_state_is_legacy_gamma(crtc_state))
+		return GAMMA_MODE_MODE_8BIT;
+	else
+		return GAMMA_MODE_MODE_10BIT;
+}
+
+static int glk_color_check(struct intel_crtc_state *crtc_state)
+{
+	int ret;
+
+	ret = check_luts(crtc_state);
+	if (ret)
+		return ret;
+
+	crtc_state->gamma_enable =
+		crtc_state->base.gamma_lut &&
+		!crtc_state->c8_planes;
+
+	/* On GLK+ degamma LUT is controlled by csc_enable */
+	crtc_state->csc_enable =
+		crtc_state->base.degamma_lut ||
+		crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB ||
+		crtc_state->base.ctm || crtc_state->limited_color_range;
+
+	crtc_state->gamma_mode = glk_gamma_mode(crtc_state);
+
+	crtc_state->csc_mode = 0;
+
+	ret = intel_color_add_affected_planes(crtc_state);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
 static u32 icl_gamma_mode(const struct intel_crtc_state *crtc_state)
 {
 	u32 gamma_mode = 0;
@@ -997,6 +1035,8 @@ void intel_color_init(struct intel_crtc *crtc)
 
 		if (INTEL_GEN(dev_priv) >= 11)
 			dev_priv->display.color_check = icl_color_check;
+		else if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
+			dev_priv->display.color_check = glk_color_check;
 		else
 			dev_priv->display.color_check = _intel_color_check;
 	}
-- 
2.19.2