drm/sti: add hdmi_mode property for HDMI connector

Configures the framer of the HDMI connection.
By default starts in HDMI mode and can be swtich to DVI.
Signed-off-by: Vincent Abriou <vincent.abriou@st.com>
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>

drivers/gpu/drm/sti/sti_hdmi.c

@@ -129,6 +129,7 @@ struct sti_hdmi_connector {
 	struct drm_encoder *encoder;
 	struct sti_hdmi *hdmi;
 	struct drm_property *colorspace_property;
+	struct drm_property *hdmi_mode_property;
 };
 
 #define to_sti_hdmi_connector(x) \
@@ -229,8 +230,10 @@ static void hdmi_config(struct sti_hdmi *hdmi)
 	/* Clear overrun and underrun fifo */
 	conf = HDMI_CFG_FIFO_OVERRUN_CLR | HDMI_CFG_FIFO_UNDERRUN_CLR;
 
-	/* Enable HDMI mode not DVI */
-	conf |= HDMI_CFG_HDMI_NOT_DVI | HDMI_CFG_ESS_NOT_OESS;
+	/* Select encryption type and the framing mode */
+	conf |= HDMI_CFG_ESS_NOT_OESS;
+	if (hdmi->hdmi_mode == HDMI_MODE_HDMI)
+		conf |= HDMI_CFG_HDMI_NOT_DVI;
 
 	/* Enable sink term detection */
 	conf |= HDMI_CFG_SINK_TERM_DET_EN;
@@ -791,6 +794,19 @@ static void sti_hdmi_connector_init_property(struct drm_device *drm_dev,
 	}
 	hdmi_connector->colorspace_property = prop;
 	drm_object_attach_property(&connector->base, prop, hdmi->colorspace);
+
+	/* hdmi_mode property */
+	hdmi->hdmi_mode = DEFAULT_HDMI_MODE;
+	prop = drm_property_create_enum(drm_dev, 0, "hdmi_mode",
+					hdmi_mode_names,
+					ARRAY_SIZE(hdmi_mode_names));
+	if (!prop) {
+		DRM_ERROR("fails to create colorspace property\n");
+		return;
+	}
+	hdmi_connector->hdmi_mode_property = prop;
+	drm_object_attach_property(&connector->base, prop, hdmi->hdmi_mode);
+
 }
 
 static int
@@ -808,6 +824,11 @@ sti_hdmi_connector_set_property(struct drm_connector *connector,
 		return 0;
 	}
 
+	if (property == hdmi_connector->hdmi_mode_property) {
+		hdmi->hdmi_mode = val;
+		return 0;
+	}
+
 	DRM_ERROR("failed to set hdmi connector property\n");
 	return -EINVAL;
 }
@@ -827,6 +848,11 @@ sti_hdmi_connector_get_property(struct drm_connector *connector,
 		return 0;
 	}
 
+	if (property == hdmi_connector->hdmi_mode_property) {
+		*val = hdmi->hdmi_mode;
+		return 0;
+	}
+
 	DRM_ERROR("failed to get hdmi connector property\n");
 	return -EINVAL;
 }

drivers/gpu/drm/sti/sti_hdmi.h

@@ -25,6 +25,19 @@ struct hdmi_phy_ops {
 	void (*stop)(struct sti_hdmi *hdmi);
 };
 
+/* values for the framing mode property */
+enum sti_hdmi_modes {
+	HDMI_MODE_HDMI,
+	HDMI_MODE_DVI,
+};
+
+static const struct drm_prop_enum_list hdmi_mode_names[] = {
+	{ HDMI_MODE_HDMI, "hdmi" },
+	{ HDMI_MODE_DVI, "dvi" },
+};
+
+#define DEFAULT_HDMI_MODE HDMI_MODE_HDMI
+
 static const struct drm_prop_enum_list colorspace_mode_names[] = {
 	{ HDMI_COLORSPACE_RGB, "rgb" },
 	{ HDMI_COLORSPACE_YUV422, "yuv422" },
@@ -55,6 +68,7 @@ static const struct drm_prop_enum_list colorspace_mode_names[] = {
  * @reset: reset control of the hdmi phy
  * @ddc_adapt: i2c ddc adapter
  * @colorspace: current colorspace selected
+ * @hdmi_mode: select framing for HDMI or DVI
  */
 struct sti_hdmi {
 	struct device dev;
@@ -76,6 +90,7 @@ struct sti_hdmi {
 	struct reset_control *reset;
 	struct i2c_adapter *ddc_adapt;
 	enum hdmi_colorspace colorspace;
+	enum sti_hdmi_modes hdmi_mode;
 };
 
 u32 hdmi_read(struct sti_hdmi *hdmi, int offset);