drm/connector: Add TV standard property

The TV mode property has been around for a while now to select and get the
current TV mode output on an analog TV connector.

Despite that property name being generic, its content isn't and has been
driver-specific which makes it hard to build any generic behaviour on top
of it, both in kernel and user-space.

Let's create a new enum tv norm property, that can contain any of the
analog TV standards currently supported by kernel drivers. Each driver can
then pass in a bitmask of the modes it supports, and the property
creation function will filter out the modes not supported.

We'll then be able to phase out the older tv mode property.

Tested-by: Mateusz Kwiatkowski <kfyatek+publicgit@gmail.com>
Acked-in-principle-or-something-like-that-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://lore.kernel.org/r/20220728-rpi-analog-tv-properties-v10-5-256dad125326@cerno.tech
Signed-off-by: Maxime Ripard <maxime@cerno.tech>

1 files changed, 64 insertions, 0 deletions

diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 572bd6487247..efa32e88a5b7 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -144,6 +144,65 @@ enum subpixel_order {
 };
 
 /**
+ * enum drm_connector_tv_mode - Analog TV output mode
+ *
+ * This enum is used to indicate the TV output mode used on an analog TV
+ * connector.
+ *
+ * WARNING: The values of this enum is uABI since they're exposed in the
+ * "TV mode" connector property.
+ */
+enum drm_connector_tv_mode {
+	/**
+	 * @DRM_MODE_TV_MODE_NTSC: CCIR System M (aka 525-lines)
+	 * together with the NTSC Color Encoding.
+	 */
+	DRM_MODE_TV_MODE_NTSC,
+
+	/**
+	 * @DRM_MODE_TV_MODE_NTSC_443: Variant of
+	 * @DRM_MODE_TV_MODE_NTSC. Uses a color subcarrier frequency
+	 * of 4.43 MHz.
+	 */
+	DRM_MODE_TV_MODE_NTSC_443,
+
+	/**
+	 * @DRM_MODE_TV_MODE_NTSC_J: Variant of @DRM_MODE_TV_MODE_NTSC
+	 * used in Japan. Uses a black level equals to the blanking
+	 * level.
+	 */
+	DRM_MODE_TV_MODE_NTSC_J,
+
+	/**
+	 * @DRM_MODE_TV_MODE_PAL: CCIR System B together with the PAL
+	 * color system.
+	 */
+	DRM_MODE_TV_MODE_PAL,
+
+	/**
+	 * @DRM_MODE_TV_MODE_PAL_M: CCIR System M (aka 525-lines)
+	 * together with the PAL color encoding
+	 */
+	DRM_MODE_TV_MODE_PAL_M,
+
+	/**
+	 * @DRM_MODE_TV_MODE_PAL_N: CCIR System N together with the PAL
+	 * color encoding. It uses 625 lines, but has a color subcarrier
+	 * frequency of 3.58MHz, the SECAM color space, and narrower
+	 * channels compared to most of the other PAL variants.
+	 */
+	DRM_MODE_TV_MODE_PAL_N,
+
+	/**
+	 * @DRM_MODE_TV_MODE_SECAM: CCIR System B together with the
+	 * SECAM color system.
+	 */
+	DRM_MODE_TV_MODE_SECAM,
+
+	DRM_MODE_TV_MODE_MAX,
+};
+
+/**
  * struct drm_scrambling: sink's scrambling support.
  */
 struct drm_scrambling {
@@ -702,6 +761,7 @@ struct drm_connector_tv_margins {
  * @subconnector: detected subconnector
  * @margins: TV margins
  * @legacy_mode: Legacy TV mode, driver specific value
+ * @mode: TV mode
  * @brightness: brightness in percent
  * @contrast: contrast in percent
  * @flicker_reduction: flicker reduction in percent
@@ -714,6 +774,7 @@ struct drm_tv_connector_state {
 	enum drm_mode_subconnector subconnector;
 	struct drm_connector_tv_margins margins;
 	unsigned int legacy_mode;
+	unsigned int mode;
 	unsigned int brightness;
 	unsigned int contrast;
 	unsigned int flicker_reduction;
@@ -1810,6 +1871,7 @@ const char *drm_get_subpixel_order_name(enum subpixel_order order);
 const char *drm_get_dpms_name(int val);
 const char *drm_get_dvi_i_subconnector_name(int val);
 const char *drm_get_dvi_i_select_name(int val);
+const char *drm_get_tv_mode_name(int val);
 const char *drm_get_tv_subconnector_name(int val);
 const char *drm_get_tv_select_name(int val);
 const char *drm_get_dp_subconnector_name(int val);
@@ -1823,6 +1885,8 @@ int drm_mode_create_tv_margin_properties(struct drm_device *dev);
 int drm_mode_create_tv_properties_legacy(struct drm_device *dev,
 					 unsigned int num_modes,
 					 const char * const modes[]);
+int drm_mode_create_tv_properties(struct drm_device *dev,
+				  unsigned int supported_tv_modes);
 void drm_connector_attach_tv_margin_properties(struct drm_connector *conn);
 int drm_mode_create_scaling_mode_property(struct drm_device *dev);
 int drm_connector_attach_content_type_property(struct drm_connector *dev);