+static void update_connector_ext_caps(struct amdgpu_dm_connector *aconnector)
+{
+ u32 max_cll, min_cll, max, min, q, r;
+ struct amdgpu_dm_backlight_caps *caps;
+ struct amdgpu_display_manager *dm;
+ struct drm_connector *conn_base;
+ struct amdgpu_device *adev;
+ static const u8 pre_computed_values[] = {
+ 50, 51, 52, 53, 55, 56, 57, 58, 59, 61, 62, 63, 65, 66, 68, 69,
+ 71, 72, 74, 75, 77, 79, 81, 82, 84, 86, 88, 90, 92, 94, 96, 98};
+
+ if (!aconnector || !aconnector->dc_link)
+ return;
+
+ conn_base = &aconnector->base;
+ adev = conn_base->dev->dev_private;
+ dm = &adev->dm;
+ caps = &dm->backlight_caps;
+ caps->ext_caps = &aconnector->dc_link->dpcd_sink_ext_caps;
+ caps->aux_support = false;
+ max_cll = conn_base->hdr_sink_metadata.hdmi_type1.max_cll;
+ min_cll = conn_base->hdr_sink_metadata.hdmi_type1.min_cll;
+
+ if (caps->ext_caps->bits.oled == 1 ||
+ caps->ext_caps->bits.sdr_aux_backlight_control == 1 ||
+ caps->ext_caps->bits.hdr_aux_backlight_control == 1)
+ caps->aux_support = true;
+
+ /* From the specification (CTA-861-G), for calculating the maximum
+ * luminance we need to use:
+ * Luminance = 50*2**(CV/32)
+ * Where CV is a one-byte value.
+ * For calculating this expression we may need float point precision;
+ * to avoid this complexity level, we take advantage that CV is divided
+ * by a constant. From the Euclids division algorithm, we know that CV
+ * can be written as: CV = 32*q + r. Next, we replace CV in the
+ * Luminance expression and get 50*(2**q)*(2**(r/32)), hence we just
+ * need to pre-compute the value of r/32. For pre-computing the values
+ * We just used the following Ruby line:
+ * (0...32).each {|cv| puts (50*2**(cv/32.0)).round}
+ * The results of the above expressions can be verified at
+ * pre_computed_values.
+ */
+ q = max_cll >> 5;
+ r = max_cll % 32;
+ max = (1 << q) * pre_computed_values[r];
+
+ // min luminance: maxLum * (CV/255)^2 / 100
+ q = DIV_ROUND_CLOSEST(min_cll, 255);
+ min = max * DIV_ROUND_CLOSEST((q * q), 100);
+
+ caps->aux_max_input_signal = max;
+ caps->aux_min_input_signal = min;
+}
+
+void amdgpu_dm_update_connector_after_detect(
+ struct amdgpu_dm_connector *aconnector)