drm/i915: Fix CHV CGM CSC coefficient sign handling

The CHV CGM CSC coefficients are in s4.12 two's complement
format. Fix the CTM->CGM conversion to handle that correctly
instead of pretending that the hw coefficients are also
in some sign-magnitude format.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230413164916.4221-4-ville.syrjala@linux.intel.comReviewed-by: Uma Shankar <uma.shankar@intel.com>

drivers/gpu/drm/i915/display/intel_color.c

@@ -568,29 +568,41 @@ static void icl_load_csc_matrix(const struct intel_crtc_state *crtc_state)
 		icl_update_output_csc(crtc, &crtc_state->output_csc);
 }
 
-static void chv_cgm_csc_convert_ctm(const struct intel_crtc_state *crtc_state,
-				    struct intel_csc_matrix *csc)
+static u16 ctm_to_twos_complement(u64 coeff, int int_bits, int frac_bits)
 {
-	const struct drm_color_ctm *ctm = crtc_state->hw.ctm->data;
-	int i;
+	s64 c = CTM_COEFF_ABS(coeff);
 
-	for (i = 0; i < 9; i++) {
-		u64 abs_coeff = ((1ULL << 63) - 1) & ctm->matrix[i];
+	/* leave an extra bit for rounding */
+	c >>= 32 - frac_bits - 1;
 
-		/* Round coefficient. */
-		abs_coeff += 1 << (32 - 13);
-		/* Clamp to hardware limits. */
-		abs_coeff = clamp_val(abs_coeff, 0, CTM_COEFF_8_0 - 1);
+	/* round and drop the extra bit */
+	c = (c + 1) >> 1;
 
-		csc->coeff[i] = 0;
+	if (CTM_COEFF_NEGATIVE(coeff))
+		c = -c;
 
-		/* Write coefficients in S3.12 format. */
-		if (ctm->matrix[i] & (1ULL << 63))
-			csc->coeff[i] |= 1 << 15;
+	c = clamp(c, -(s64)BIT(int_bits + frac_bits - 1),
+		  (s64)(BIT(int_bits + frac_bits - 1) - 1));
 
-		csc->coeff[i] |= ((abs_coeff >> 32) & 7) << 12;
-		csc->coeff[i] |= (abs_coeff >> 20) & 0xfff;
-	}
+	return c & (BIT(int_bits + frac_bits) - 1);
+}
+
+/*
+ * CHV Color Gamut Mapping (CGM) CSC
+ * |r|   | c0 c1 c2 |   |r|
+ * |g| = | c3 c4 c5 | x |g|
+ * |b|   | c6 c7 c8 |   |b|
+ *
+ * Coefficients are two's complement s4.12.
+ */
+static void chv_cgm_csc_convert_ctm(const struct intel_crtc_state *crtc_state,
+				    struct intel_csc_matrix *csc)
+{
+	const struct drm_color_ctm *ctm = crtc_state->hw.ctm->data;
+	int i;
+
+	for (i = 0; i < 9; i++)
+		csc->coeff[i] = ctm_to_twos_complement(ctm->matrix[i], 4, 12);
 }
 
 static void chv_load_cgm_csc(struct intel_crtc *crtc,