[Intel-gfx] [PATCH 3/3] drm/i915: Add aspect ratio property for HDMI

[Vandana Kannan]

Create and attach the drm property to set aspect ratio. If there is no user
specified value, then PAR_NONE/Automatic option is set by default. User can
select aspect ratio 4:3 or 16:9. The aspect ratio selected by user would
come into effect with a mode set.

Signed-off-by: Vandana Kannan <vandana.kannan at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h   |  5 +++++
 drivers/gpu/drm/i915/intel_drv.h  |  1 +
 drivers/gpu/drm/i915/intel_hdmi.c | 31 +++++++++++++++++++++++++++++++
 3 files changed, 37 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 13495a4..8dc5f59 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2691,6 +2691,11 @@ int vlv_freq_opcode(struct drm_i915_private *dev_priv, int val);
 #define INTEL_BROADCAST_RGB_FULL 1
 #define INTEL_BROADCAST_RGB_LIMITED 2
 
+/* Aspect ratio property */
+#define INTEL_ASPECT_RATIO_AUTO 0
+#define INTEL_ASPECT_RATIO_4_3  1
+#define INTEL_ASPECT_RATIO_16_9 2
+
 static inline uint32_t i915_vgacntrl_reg(struct drm_device *dev)
 {
 	if (HAS_PCH_SPLIT(dev))
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 287b89e..f9f19b6 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -488,6 +488,7 @@ struct intel_hdmi {
 	bool has_audio;
 	enum hdmi_force_audio force_audio;
 	bool rgb_quant_range_selectable;
+	enum hdmi_picture_aspect aspect_ratio;
 	void (*write_infoframe)(struct drm_encoder *encoder,
 				enum hdmi_infoframe_type type,
 				const void *frame, ssize_t len);
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 171d0dd..2c6aa76 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -367,6 +367,9 @@ static void intel_hdmi_set_avi_infoframe(struct drm_encoder *encoder,
 	union hdmi_infoframe frame;
 	int ret;
 
+	/* Set user selected PAR to incoming mode's member */
+	adjusted_mode->picture_aspect_ratio = intel_hdmi->aspect_ratio;
+
 	ret = drm_hdmi_avi_infoframe_from_display_mode(&frame.avi,
 						       adjusted_mode);
 	if (ret < 0) {
@@ -1124,6 +1127,23 @@ intel_hdmi_set_property(struct drm_connector *connector,
 		goto done;
 	}
 
+	if (property == connector->dev->mode_config.aspect_ratio_property) {
+		switch (val) {
+		case INTEL_ASPECT_RATIO_AUTO:
+			intel_hdmi->aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
+			break;
+		case INTEL_ASPECT_RATIO_4_3:
+			intel_hdmi->aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
+			break;
+		case INTEL_ASPECT_RATIO_16_9:
+			intel_hdmi->aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
+			break;
+		default:
+			return -EINVAL;
+		}
+		goto done;
+	}
+
 	return -EINVAL;
 
 done:
@@ -1416,11 +1436,22 @@ static const struct drm_encoder_funcs intel_hdmi_enc_funcs = {
 };
 
 static void
+intel_attach_aspect_ratio_property(struct drm_connector *connector)
+{
+	drm_mode_create_aspect_ratio_property(connector->dev);
+	drm_object_attach_property(&connector->base,
+			connector->dev->mode_config.aspect_ratio_property,
+			HDMI_PICTURE_ASPECT_NONE);
+}
+
+static void
 intel_hdmi_add_properties(struct intel_hdmi *intel_hdmi, struct drm_connector *connector)
 {
 	intel_attach_force_audio_property(connector);
 	intel_attach_broadcast_rgb_property(connector);
 	intel_hdmi->color_range_auto = true;
+	intel_attach_aspect_ratio_property(connector);
+	intel_hdmi->aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
 }
 
 void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
-- 
1.9.3