[PATCH 11/11] [v2] drm/i915: Add intel_compare_color_lut() to compare hw and sw gamma lut values

[Swati Sharma <swati2.sharma@xxxxxxxxx>]

Signed-off-by: Swati Sharma <swati2.sharma@xxxxxxxxx>
---
 drivers/gpu/drm/i915/intel_color.c   | 49 ++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_display.c | 10 ++++++++
 drivers/gpu/drm/i915/intel_drv.h     |  3 +++
 3 files changed, 62 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index a099f5e..3f71ec2 100644
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -1499,6 +1499,55 @@ static void ilk_get_color_config(struct intel_crtc_state *crtc_state)
 		ilk_get_gamma_config(crtc_state);
 }
 
+static inline bool gamma_err_check(struct drm_color_lut *sw_lut, struct drm_color_lut *hw_lut, u32 err)
+{
+	 return ((abs((long)hw_lut->red - sw_lut->red)) >= err) ||
+	        ((abs((long)hw_lut->blue - sw_lut->blue)) >= err) ||
+	        ((abs((long)hw_lut->green - sw_lut->green)) >= err);
+}
+
+bool intel_compare_color_lut(struct drm_property_blob *blob1,
+			     struct drm_property_blob *blob2,
+			     u32 gamma_mode)
+{
+	struct drm_color_lut *sw_lut = blob1->data;
+	struct drm_color_lut *hw_lut = blob2->data;
+	int sw_lut_size, hw_lut_size, i;
+	u32 bit_precision, err;
+
+	if (!blob1 || !blob2)
+		return false;
+
+	switch(gamma_mode) {
+	case GAMMA_MODE_MODE_8BIT:
+		bit_precision = 8;
+		break;
+	case GAMMA_MODE_MODE_10BIT:
+		bit_precision = 10;
+		break;
+	case GAMMA_MODE_MODE_12BIT:
+		bit_precision = 12;
+		break;
+	default:
+		bit_precision = 8;
+	}
+
+	err = 0xffff >> bit_precision;
+
+	sw_lut_size = drm_color_lut_size(blob1);
+	hw_lut_size = drm_color_lut_size(blob2);
+
+	if (sw_lut_size != hw_lut_size)
+		return false;
+
+	for (i = 0; i < sw_lut_size; i++) {
+		 if (!gamma_err_check(&hw_lut[i], &sw_lut[i], err))
+			return false;
+	}
+
+	return true;
+}
+
 void intel_color_init(struct intel_crtc *crtc)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 3282bc7..71425f8 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12206,6 +12206,14 @@ static bool fastboot_enabled(struct drm_i915_private *dev_priv)
 	} \
 } while (0)
 
+#define PIPE_CONF_CHECK_COLOR_LUT(name, gamma_mode) do { \
+	if (!intel_compare_color_lut(current_config->name, pipe_config->name, gamma_mode)) { \
+		pipe_config_err(adjust, __stringify(name), \
+				"hw_state doesn't match sw_state\n"); \
+		ret = false; \
+	} \
+} while (0)
+
 #define PIPE_CONF_QUIRK(quirk) \
 	((current_config->quirks | pipe_config->quirks) & (quirk))
 
@@ -12349,6 +12357,8 @@ static bool fastboot_enabled(struct drm_i915_private *dev_priv)
 	PIPE_CONF_CHECK_INFOFRAME(spd);
 	PIPE_CONF_CHECK_INFOFRAME(hdmi);
 
+	PIPE_CONF_CHECK_COLOR_LUT(base.gamma_lut, pipe_config->gamma_mode);
+
 #undef PIPE_CONF_CHECK_X
 #undef PIPE_CONF_CHECK_I
 #undef PIPE_CONF_CHECK_BOOL
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 417f985..e9371ea 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -2554,6 +2554,9 @@ int intel_plane_atomic_check_with_state(const struct intel_crtc_state *old_crtc_
 void intel_color_commit(const struct intel_crtc_state *crtc_state);
 void intel_color_load_luts(const struct intel_crtc_state *crtc_state);
 void intel_get_color_config(struct intel_crtc_state *crtc_state);
+bool intel_compare_color_lut(struct drm_property_blob *blob1,
+			     struct drm_property_blob *blob2,
+			     u32 gamma_mode);
 
 /* intel_lspcon.c */
 bool lspcon_init(struct intel_digital_port *intel_dig_port);
-- 
1.9.1

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