Ping ________________________________________ From: Intel-gfx [intel-gfx-bounces@lists.freedesktop.org] on behalf of StanLis [stanislav.lisovskiy@intel.com] Sent: Monday, April 23, 2018 10:34 AM To: dri-devel@lists.freedesktop.org Cc: intel-gfx@lists.freedesktop.org Subject: [Intel-gfx] [PATCH v7 1/2] drm: content-type property for HDMI connector

From: Stanislav Lisovskiy stanislav.lisovskiy@intel.com

Added content_type property to drm_connector_state in order to properly handle external HDMI TV content-type setting.

v2: * Moved helper function which attaches content type property to the drm core, as was suggested. Removed redundant connector state initialization.

v3: * Removed caps in drm_content_type_enum_list. After some discussion it turned out that HDMI Spec 1.4 was wrongly assuming that IT Content(itc) bit doesn't affect Content type states, however itc bit needs to be manupulated as well. In order to not expose additional property for itc, for sake of simplicity it was decided to bind those together in same "content type" property.

v4: * Added it_content checking in intel_digital_connector_atomic_check. Fixed documentation for new content type enum.

v5: * Moved patch revision's description to commit messages.

v6: * Minor naming fix for the content type enumeration string.

v7: * Fix parameter name for documentation and parameter alignment in order not to get warning. Added Content Type description to new HDMI connector properties section.

Signed-off-by: Stanislav Lisovskiy stanislav.lisovskiy@intel.com --- Documentation/gpu/drm-kms.rst | 6 +++ Documentation/gpu/kms-properties.csv | 1 + drivers/gpu/drm/drm_atomic.c | 17 +++++++ drivers/gpu/drm/drm_connector.c | 74 ++++++++++++++++++++++++++++ drivers/gpu/drm/drm_edid.c | 2 + include/drm/drm_connector.h | 18 +++++++ include/drm/drm_mode_config.h | 5 ++ include/uapi/drm/drm_mode.h | 7 +++ 8 files changed, 130 insertions(+)

diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst index 1dffd1ac4cd4..e233c2626bd0 100644 --- a/Documentation/gpu/drm-kms.rst +++ b/Documentation/gpu/drm-kms.rst @@ -517,6 +517,12 @@ Standard Connector Properties .. kernel-doc:: drivers/gpu/drm/drm_connector.c :doc: standard connector properties

+HDMI Specific Connector Properties +----------------------------- + +.. kernel-doc:: drivers/gpu/drm/drm_connector.c + :doc: HDMI connector properties + Plane Composition Properties ----------------------------

diff --git a/Documentation/gpu/kms-properties.csv b/Documentation/gpu/kms-properties.csv index 6b28b014cb7d..3567c986bd7d 100644 --- a/Documentation/gpu/kms-properties.csv +++ b/Documentation/gpu/kms-properties.csv @@ -17,6 +17,7 @@ Owner Module/Drivers,Group,Property Name,Type,Property Values,Object attached,De ,Virtual GPU,“suggested X”,RANGE,"Min=0, Max=0xffffffff",Connector,property to suggest an X offset for a connector ,,“suggested Y”,RANGE,"Min=0, Max=0xffffffff",Connector,property to suggest an Y offset for a connector ,Optional,"""aspect ratio""",ENUM,"{ ""None"", ""4:3"", ""16:9"" }",Connector,TDB +,Optional,"""content type""",ENUM,"{ ""No Data"", ""Graphics"", ""Photo"", ""Cinema"", ""Game"" }",Connector,TBD i915,Generic,"""Broadcast RGB""",ENUM,"{ ""Automatic"", ""Full"", ""Limited 16:235"" }",Connector,"When this property is set to Limited 16:235 and CTM is set, the hardware will be programmed with the result of the multiplication of CTM by the limited range matrix to ensure the pixels normaly in the range 0..1.0 are remapped to the range 16/255..235/255." ,,“audio”,ENUM,"{ ""force-dvi"", ""off"", ""auto"", ""on"" }",Connector,TBD ,SDVO-TV,“mode”,ENUM,"{ ""NTSC_M"", ""NTSC_J"", ""NTSC_443"", ""PAL_B"" } etc.",Connector,TBD diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 7d25c42f22db..479499f5848e 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -1266,6 +1266,15 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector, state->link_status = val; } else if (property == config->aspect_ratio_property) { state->picture_aspect_ratio = val; + } else if (property == config->content_type_property) { + /* + * Lowest two bits of content_type property control + * content_type, bit 2 controls itc bit. + * It was decided to have a single property called + * content_type, instead of content_type and itc. + */ + state->content_type = val & 3; + state->it_content = val >> 2; } else if (property == connector->scaling_mode_property) { state->scaling_mode = val; } else if (property == connector->content_protection_property) { @@ -1351,6 +1360,14 @@ drm_atomic_connector_get_property(struct drm_connector *connector, *val = state->link_status; } else if (property == config->aspect_ratio_property) { *val = state->picture_aspect_ratio; + } else if (property == config->content_type_property) { + /* + * Lowest two bits of content_type property control + * content_type, bit 2 controls itc bit. + * It was decided to have a single property called + * content_type, instead of content_type and itc. + */ + *val = state->content_type | (state->it_content << 2); } else if (property == connector->scaling_mode_property) { *val = state->scaling_mode; } else if (property == connector->content_protection_property) { diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index b3cde897cd80..4f89602ebaf0 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -720,6 +720,14 @@ static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = { { DRM_MODE_PICTURE_ASPECT_16_9, "16:9" }, };

+static const struct drm_prop_enum_list drm_content_type_enum_list[] = { + { DRM_MODE_CONTENT_TYPE_NO_DATA, "No Data" }, + { DRM_MODE_CONTENT_TYPE_GRAPHICS, "Graphics" }, + { DRM_MODE_CONTENT_TYPE_PHOTO, "Photo" }, + { DRM_MODE_CONTENT_TYPE_CINEMA, "Cinema" }, + { DRM_MODE_CONTENT_TYPE_GAME, "Game" }, +}; + static const struct drm_prop_enum_list drm_panel_orientation_enum_list[] = { { DRM_MODE_PANEL_ORIENTATION_NORMAL, "Normal" }, { DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP, "Upside Down" }, @@ -996,6 +1004,45 @@ int drm_mode_create_dvi_i_properties(struct drm_device *dev) } EXPORT_SYMBOL(drm_mode_create_dvi_i_properties);

+ +/** + * DOC: HDMI connector properties + * + * content type (HDMI specific): + * Indicates content type setting to be used in HDMI infoframes to indicate + * content type for the external device, so that it adjusts it's display + * settings accordingly. + * + * The value of this property can be one of the following: + * + * - DRM_MODE_CONTENT_TYPE_NO_DATA = 0 + * Content type is unknown, it content(itc) bit is cleared. + * - DRM_MODE_CONTENT_TYPE_GRAPHICS = 4 + * Content type is graphics, it content(itc) bit is set. + * - DRM_MODE_CONTENT_TYPE_PHOTO = 5 + * Content type is photo, itc bit is set. + * - DRM_MODE_CONTENT_TYPE_CINEMA = 6 + * Content type is cinema, itc bit is set. + * - DRM_MODE_CONTENT_TYPE_GAME = 7 + * Content type is game, itc bit is set. + */ + +/** + * drm_connector_attach_content_type_property - attach content-type property + * @connector: connector to attach content type property on. + * + * Called by a driver the first time a HDMI connector is made. + */ +int drm_connector_attach_content_type_property(struct drm_connector *connector) +{ + if (!drm_mode_create_content_type_property(connector->dev)) + drm_object_attach_property(&connector->base, + connector->dev->mode_config.content_type_property, + DRM_MODE_CONTENT_TYPE_NO_DATA); + return 0; +} +EXPORT_SYMBOL(drm_connector_attach_content_type_property); + /** * drm_create_tv_properties - create TV specific connector properties * @dev: DRM device @@ -1260,6 +1307,33 @@ int drm_mode_create_aspect_ratio_property(struct drm_device *dev) } EXPORT_SYMBOL(drm_mode_create_aspect_ratio_property);

+/** + * drm_mode_create_content_type_property - create content type property + * @dev: DRM device + * + * Called by a driver the first time it's needed, must be attached to desired + * connectors. + * + * Returns: + * Zero on success, negative errno on failure. + */ +int drm_mode_create_content_type_property(struct drm_device *dev) +{ + if (dev->mode_config.content_type_property) + return 0; + + dev->mode_config.content_type_property = + drm_property_create_enum(dev, 0, "content type", + drm_content_type_enum_list, + ARRAY_SIZE(drm_content_type_enum_list)); + + if (dev->mode_config.content_type_property == NULL) + return -ENOMEM; + + return 0; +} +EXPORT_SYMBOL(drm_mode_create_content_type_property); + /** * drm_mode_create_suggested_offset_properties - create suggests offset properties * @dev: DRM device diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 134069f36482..b1b7f9683e34 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -4867,6 +4867,8 @@ drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame, }

frame->picture_aspect = HDMI_PICTURE_ASPECT_NONE; + frame->content_type = HDMI_CONTENT_TYPE_GRAPHICS; + frame->itc = 0;

/* * Populate picture aspect ratio from either diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 675cc3f8cf85..1fedab750f09 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -418,6 +418,22 @@ struct drm_connector_state { */ enum hdmi_picture_aspect picture_aspect_ratio;

+ /** + * @content_type: Connector property to control the + * HDMI infoframe content type setting. + * The %DRM_MODE_CONTENT_TYPE_* values lowest 2 bits much + * match the values for &enum hdmi_content_type + */ + enum hdmi_content_type content_type; + + /** + * @it_content: Connector property to control the + * HDMI infoframe it content setting(used with content type). + * The %DRM_MODE_CONTENT_TYPE_* values bit 2 + * match the values of it_content + */ + bool it_content; + /** * @scaling_mode: Connector property to control the * upscaling, mostly used for built-in panels. @@ -1089,11 +1105,13 @@ int drm_mode_create_tv_properties(struct drm_device *dev, unsigned int num_modes, const char * const modes[]); int drm_mode_create_scaling_mode_property(struct drm_device *dev); +int drm_connector_attach_content_type_property(struct drm_connector *dev); int drm_connector_attach_scaling_mode_property(struct drm_connector *connector, u32 scaling_mode_mask); int drm_connector_attach_content_protection_property( struct drm_connector *connector); int drm_mode_create_aspect_ratio_property(struct drm_device *dev); +int drm_mode_create_content_type_property(struct drm_device *dev); int drm_mode_create_suggested_offset_properties(struct drm_device *dev);

int drm_mode_connector_set_path_property(struct drm_connector *connector, diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h index 33b3a96d66d0..fb45839179dd 100644 --- a/include/drm/drm_mode_config.h +++ b/include/drm/drm_mode_config.h @@ -726,6 +726,11 @@ struct drm_mode_config { * HDMI infoframe aspect ratio setting. */ struct drm_property *aspect_ratio_property; + /** + * @content_type_property: Optional connector property to control the + * HDMI infoframe content type setting. + */ + struct drm_property *content_type_property; /** * @degamma_lut_property: Optional CRTC property to set the LUT used to * convert the framebuffer's colors to linear gamma. diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index 50bcf4214ff9..3c234bfa80b9 100644 --- a/include/uapi/drm/drm_mode.h +++ b/include/uapi/drm/drm_mode.h @@ -94,6 +94,13 @@ extern "C" { #define DRM_MODE_PICTURE_ASPECT_4_3 1 #define DRM_MODE_PICTURE_ASPECT_16_9 2

+/* HDMI content type and itc bit bound together for simplicity */ +#define DRM_MODE_CONTENT_TYPE_NO_DATA 0 +#define DRM_MODE_CONTENT_TYPE_GRAPHICS 4 +#define DRM_MODE_CONTENT_TYPE_PHOTO 5 +#define DRM_MODE_CONTENT_TYPE_CINEMA 6 +#define DRM_MODE_CONTENT_TYPE_GAME 7 + /* Aspect ratio flag bitmask (4 bits 22:19) */ #define DRM_MODE_FLAG_PIC_AR_MASK (0x0F<<19) #define DRM_MODE_FLAG_PIC_AR_NONE \ -- 2.17.0

_______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx

On Mon, Apr 23, 2018 at 10:34:41AM +0300, StanLis wrote:

From: Stanislav Lisovskiy stanislav.lisovskiy@intel.com

Added content_type property to drm_connector_state in order to properly handle external HDMI TV content-type setting.

v2:

• Moved helper function which attaches content type property to the drm core, as was suggested. Removed redundant connector state initialization.

v3:

• Removed caps in drm_content_type_enum_list. After some discussion it turned out that HDMI Spec 1.4 was wrongly assuming that IT Content(itc) bit doesn't affect Content type states, however itc bit needs to be manupulated as well. In order to not expose additional property for itc, for sake of simplicity it was decided to bind those together in same "content type" property.

v4:

• Added it_content checking in intel_digital_connector_atomic_check. Fixed documentation for new content type enum.

v5:

• Moved patch revision's description to commit messages.

v6:

• Minor naming fix for the content type enumeration string.

v7:

• Fix parameter name for documentation and parameter alignment in order not to get warning. Added Content Type description to new HDMI connector properties section.

Signed-off-by: Stanislav Lisovskiy stanislav.lisovskiy@intel.com

Documentation/gpu/drm-kms.rst | 6 +++ Documentation/gpu/kms-properties.csv | 1 + drivers/gpu/drm/drm_atomic.c | 17 +++++++ drivers/gpu/drm/drm_connector.c | 74 ++++++++++++++++++++++++++++ drivers/gpu/drm/drm_edid.c | 2 + include/drm/drm_connector.h | 18 +++++++ include/drm/drm_mode_config.h | 5 ++ include/uapi/drm/drm_mode.h | 7 +++ 8 files changed, 130 insertions(+)

diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst index 1dffd1ac4cd4..e233c2626bd0 100644 --- a/Documentation/gpu/drm-kms.rst +++ b/Documentation/gpu/drm-kms.rst @@ -517,6 +517,12 @@ Standard Connector Properties .. kernel-doc:: drivers/gpu/drm/drm_connector.c :doc: standard connector properties

+HDMI Specific Connector Properties +-----------------------------

+.. kernel-doc:: drivers/gpu/drm/drm_connector.c

• :doc: HDMI connector properties

Plane Composition Properties

diff --git a/Documentation/gpu/kms-properties.csv b/Documentation/gpu/kms-properties.csv index 6b28b014cb7d..3567c986bd7d 100644 --- a/Documentation/gpu/kms-properties.csv +++ b/Documentation/gpu/kms-properties.csv @@ -17,6 +17,7 @@ Owner Module/Drivers,Group,Property Name,Type,Property Values,Object attached,De ,Virtual GPU,“suggested X”,RANGE,"Min=0, Max=0xffffffff",Connector,property to suggest an X offset for a connector ,,“suggested Y”,RANGE,"Min=0, Max=0xffffffff",Connector,property to suggest an Y offset for a connector ,Optional,"""aspect ratio""",ENUM,"{ ""None"", ""4:3"", ""16:9"" }",Connector,TDB +,Optional,"""content type""",ENUM,"{ ""No Data"", ""Graphics"", ""Photo"", ""Cinema"", ""Game"" }",Connector,TBD i915,Generic,"""Broadcast RGB""",ENUM,"{ ""Automatic"", ""Full"", ""Limited 16:235"" }",Connector,"When this property is set to Limited 16:235 and CTM is set, the hardware will be programmed with the result of the multiplication of CTM by the limited range matrix to ensure the pixels normaly in the range 0..1.0 are remapped to the range 16/255..235/255." ,,“audio”,ENUM,"{ ""force-dvi"", ""off"", ""auto"", ""on"" }",Connector,TBD ,SDVO-TV,“mode”,ENUM,"{ ""NTSC_M"", ""NTSC_J"", ""NTSC_443"", ""PAL_B"" } etc.",Connector,TBD diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 7d25c42f22db..479499f5848e 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -1266,6 +1266,15 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector, state->link_status = val; } else if (property == config->aspect_ratio_property) { state->picture_aspect_ratio = val;

• } else if (property == config->content_type_property) {

• /*
  

•  * Lowest two bits of content_type property control
  

•  * content_type, bit 2 controls itc bit.
  

•  * It was decided to have a single property called
  

•  * content_type, instead of content_type and itc.
  

•  */
  

• state->content_type = val & 3;
  

• state->it_content = val >> 2;
  

  } else if (property == connector->scaling_mode_property) { state->scaling_mode = val; } else if (property == connector->content_protection_property) {

@@ -1351,6 +1360,14 @@ drm_atomic_connector_get_property(struct drm_connector *connector, *val = state->link_status; } else if (property == config->aspect_ratio_property) { *val = state->picture_aspect_ratio;

• } else if (property == config->content_type_property) {

• /*
  

•  * Lowest two bits of content_type property control
  

•  * content_type, bit 2 controls itc bit.
  

•  * It was decided to have a single property called
  

•  * content_type, instead of content_type and itc.
  

•  */
  

• *val = state->content_type | (state->it_content << 2);
  

  } else if (property == connector->scaling_mode_property) { *val = state->scaling_mode; } else if (property == connector->content_protection_property) {

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index b3cde897cd80..4f89602ebaf0 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -720,6 +720,14 @@ static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = { { DRM_MODE_PICTURE_ASPECT_16_9, "16:9" }, };

+static const struct drm_prop_enum_list drm_content_type_enum_list[] = {

• { DRM_MODE_CONTENT_TYPE_NO_DATA, "No Data" },
• { DRM_MODE_CONTENT_TYPE_GRAPHICS, "Graphics" },
• { DRM_MODE_CONTENT_TYPE_PHOTO, "Photo" },
• { DRM_MODE_CONTENT_TYPE_CINEMA, "Cinema" },
• { DRM_MODE_CONTENT_TYPE_GAME, "Game" },

+};

static const struct drm_prop_enum_list drm_panel_orientation_enum_list[] = { { DRM_MODE_PANEL_ORIENTATION_NORMAL, "Normal" }, { DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP, "Upside Down" }, @@ -996,6 +1004,45 @@ int drm_mode_create_dvi_i_properties(struct drm_device *dev) } EXPORT_SYMBOL(drm_mode_create_dvi_i_properties);

+/**

• • DOC: HDMI connector properties
• • content type (HDMI specific):
• • Indicates content type setting to be used in HDMI infoframes to indicate
• • content type for the external device, so that it adjusts it's display
• • settings accordingly.
• • The value of this property can be one of the following:
• • • DRM_MODE_CONTENT_TYPE_NO_DATA = 0

• • Content type is unknown, it content(itc) bit is cleared.
    

• • • DRM_MODE_CONTENT_TYPE_GRAPHICS = 4

• • Content type is graphics, it content(itc) bit is set.
    

• • • DRM_MODE_CONTENT_TYPE_PHOTO = 5

• • Content type is photo, itc bit is set.
    

• • • DRM_MODE_CONTENT_TYPE_CINEMA = 6

• • Content type is cinema, itc bit is set.
    

• • • DRM_MODE_CONTENT_TYPE_GAME = 7

• • Content type is game, itc bit is set.
    

I wonder if we're trying to document the uabi or the internals here. If we are interested in the uabi, then we should document the enum value strings here. If on the other hand we're trying to document the internal details then we should keep the DRM_CONTENT_TYPE_* stuff. Maybe we want both? The raw numbers I think we should just throw out. While they do have some specific meaning in the case (matching the bits in the infoframe), I'm not sure that's important enough to include in the docs. We could add a comment next to the DRM_MODE_CONTENT_TYPE_* definitions.

Looks like the content protection prop is documenting the internals only as well. Hmm. Actually it looks like those things are defined in the uapi header. Oh and the scaling mode prop also does that. This is all setting a rather bad example for userspace. Or maybe we've given up on the "the string is the uabi" notion entirely?

On Fri, Apr 27, 2018 at 10:40:00PM +0300, Ville Syrjälä wrote:

On Mon, Apr 23, 2018 at 10:34:41AM +0300, StanLis wrote:

...

From: Stanislav Lisovskiy stanislav.lisovskiy@intel.com

Added content_type property to drm_connector_state in order to properly handle external HDMI TV content-type setting.

v2:

• Moved helper function which attaches content type property to the drm core, as was suggested. Removed redundant connector state initialization.

v3:

• Removed caps in drm_content_type_enum_list. After some discussion it turned out that HDMI Spec 1.4 was wrongly assuming that IT Content(itc) bit doesn't affect Content type states, however itc bit needs to be manupulated as well. In order to not expose additional property for itc, for sake of simplicity it was decided to bind those together in same "content type" property.

v4:

• Added it_content checking in intel_digital_connector_atomic_check. Fixed documentation for new content type enum.

v5:

• Moved patch revision's description to commit messages.

v6:

• Minor naming fix for the content type enumeration string.

v7:

• Fix parameter name for documentation and parameter alignment in order not to get warning. Added Content Type description to new HDMI connector properties section.

Signed-off-by: Stanislav Lisovskiy stanislav.lisovskiy@intel.com

Documentation/gpu/drm-kms.rst | 6 +++ Documentation/gpu/kms-properties.csv | 1 + drivers/gpu/drm/drm_atomic.c | 17 +++++++ drivers/gpu/drm/drm_connector.c | 74 ++++++++++++++++++++++++++++ drivers/gpu/drm/drm_edid.c | 2 + include/drm/drm_connector.h | 18 +++++++ include/drm/drm_mode_config.h | 5 ++ include/uapi/drm/drm_mode.h | 7 +++ 8 files changed, 130 insertions(+)

diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst index 1dffd1ac4cd4..e233c2626bd0 100644 --- a/Documentation/gpu/drm-kms.rst +++ b/Documentation/gpu/drm-kms.rst @@ -517,6 +517,12 @@ Standard Connector Properties .. kernel-doc:: drivers/gpu/drm/drm_connector.c :doc: standard connector properties

+HDMI Specific Connector Properties +-----------------------------

+.. kernel-doc:: drivers/gpu/drm/drm_connector.c

• :doc: HDMI connector properties

Plane Composition Properties

diff --git a/Documentation/gpu/kms-properties.csv b/Documentation/gpu/kms-properties.csv index 6b28b014cb7d..3567c986bd7d 100644 --- a/Documentation/gpu/kms-properties.csv +++ b/Documentation/gpu/kms-properties.csv @@ -17,6 +17,7 @@ Owner Module/Drivers,Group,Property Name,Type,Property Values,Object attached,De ,Virtual GPU,“suggested X”,RANGE,"Min=0, Max=0xffffffff",Connector,property to suggest an X offset for a connector ,,“suggested Y”,RANGE,"Min=0, Max=0xffffffff",Connector,property to suggest an Y offset for a connector ,Optional,"""aspect ratio""",ENUM,"{ ""None"", ""4:3"", ""16:9"" }",Connector,TDB +,Optional,"""content type""",ENUM,"{ ""No Data"", ""Graphics"", ""Photo"", ""Cinema"", ""Game"" }",Connector,TBD i915,Generic,"""Broadcast RGB""",ENUM,"{ ""Automatic"", ""Full"", ""Limited 16:235"" }",Connector,"When this property is set to Limited 16:235 and CTM is set, the hardware will be programmed with the result of the multiplication of CTM by the limited range matrix to ensure the pixels normaly in the range 0..1.0 are remapped to the range 16/255..235/255." ,,“audio”,ENUM,"{ ""force-dvi"", ""off"", ""auto"", ""on"" }",Connector,TBD ,SDVO-TV,“mode”,ENUM,"{ ""NTSC_M"", ""NTSC_J"", ""NTSC_443"", ""PAL_B"" } etc.",Connector,TBD diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 7d25c42f22db..479499f5848e 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -1266,6 +1266,15 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector, state->link_status = val; } else if (property == config->aspect_ratio_property) { state->picture_aspect_ratio = val;

• } else if (property == config->content_type_property) {

• /*
  

•  * Lowest two bits of content_type property control
  

•  * content_type, bit 2 controls itc bit.
  

•  * It was decided to have a single property called
  

•  * content_type, instead of content_type and itc.
  

•  */
  

• state->content_type = val & 3;
  

• state->it_content = val >> 2;
  

  } else if (property == connector->scaling_mode_property) { state->scaling_mode = val; } else if (property == connector->content_protection_property) {

@@ -1351,6 +1360,14 @@ drm_atomic_connector_get_property(struct drm_connector *connector, *val = state->link_status; } else if (property == config->aspect_ratio_property) { *val = state->picture_aspect_ratio;

• } else if (property == config->content_type_property) {

• /*
  

•  * Lowest two bits of content_type property control
  

•  * content_type, bit 2 controls itc bit.
  

•  * It was decided to have a single property called
  

•  * content_type, instead of content_type and itc.
  

•  */
  

• *val = state->content_type | (state->it_content << 2);
  

  } else if (property == connector->scaling_mode_property) { *val = state->scaling_mode; } else if (property == connector->content_protection_property) {

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index b3cde897cd80..4f89602ebaf0 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -720,6 +720,14 @@ static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = { { DRM_MODE_PICTURE_ASPECT_16_9, "16:9" }, };

+static const struct drm_prop_enum_list drm_content_type_enum_list[] = {

• { DRM_MODE_CONTENT_TYPE_NO_DATA, "No Data" },
• { DRM_MODE_CONTENT_TYPE_GRAPHICS, "Graphics" },
• { DRM_MODE_CONTENT_TYPE_PHOTO, "Photo" },
• { DRM_MODE_CONTENT_TYPE_CINEMA, "Cinema" },
• { DRM_MODE_CONTENT_TYPE_GAME, "Game" },

+};

static const struct drm_prop_enum_list drm_panel_orientation_enum_list[] = { { DRM_MODE_PANEL_ORIENTATION_NORMAL, "Normal" }, { DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP, "Upside Down" }, @@ -996,6 +1004,45 @@ int drm_mode_create_dvi_i_properties(struct drm_device *dev) } EXPORT_SYMBOL(drm_mode_create_dvi_i_properties);

+/**

• • DOC: HDMI connector properties
• • content type (HDMI specific):
• • Indicates content type setting to be used in HDMI infoframes to indicate
• • content type for the external device, so that it adjusts it's display
• • settings accordingly.
• • The value of this property can be one of the following:
• • • DRM_MODE_CONTENT_TYPE_NO_DATA = 0

• • Content type is unknown, it content(itc) bit is cleared.
    

• • • DRM_MODE_CONTENT_TYPE_GRAPHICS = 4

• • Content type is graphics, it content(itc) bit is set.
    

• • • DRM_MODE_CONTENT_TYPE_PHOTO = 5

• • Content type is photo, itc bit is set.
    

• • • DRM_MODE_CONTENT_TYPE_CINEMA = 6

• • Content type is cinema, itc bit is set.
    

• • • DRM_MODE_CONTENT_TYPE_GAME = 7

• • Content type is game, itc bit is set.
    

I wonder if we're trying to document the uabi or the internals here. If we are interested in the uabi, then we should document the enum value strings here. If on the other hand we're trying to document the internal details then we should keep the DRM_CONTENT_TYPE_* stuff. Maybe we want both? The raw numbers I think we should just throw out. While they do have some specific meaning in the case (matching the bits in the infoframe), I'm not sure that's important enough to include in the docs. We could add a comment next to the DRM_MODE_CONTENT_TYPE_* definitions.

Looks like the content protection prop is documenting the internals only as well. Hmm. Actually it looks like those things are defined in the uapi header. Oh and the scaling mode prop also does that. This is all setting a rather bad example for userspace. Or maybe we've given up on the "the string is the uabi" notion entirely?

Wrt documenting uapi: That should imo also be in there, but I realize it makes it a bit a mess. The kerneldoc should definitely align with other property docs to make sure it all looks consistent (i.e. enumeration list with the same indentation as all the other properties).

I guess it'd be good if we can aim for "the string is the uabi", but in practice people will hardcode. For cases where this is likely I think having the defines in the uapi header is probably better. -Daniel

On Wed, May 02, 2018 at 08:09:24AM +0000, Lisovskiy, Stanislav wrote:

On Mon, 2018-04-30 at 17:00 +0200, Daniel Vetter wrote:

...

On Fri, Apr 27, 2018 at 10:40:00PM +0300, Ville Syrjälä wrote:

...

On Mon, Apr 23, 2018 at 10:34:41AM +0300, StanLis wrote:

...

From: Stanislav Lisovskiy stanislav.lisovskiy@intel.com

Added content_type property to drm_connector_state in order to properly handle external HDMI TV content-type setting.

v2:

• Moved helper function which attaches content type property to the drm core, as was suggested. Removed redundant connector state initialization.

v3:

• Removed caps in drm_content_type_enum_list. After some discussion it turned out that HDMI Spec 1.4 was wrongly assuming that IT Content(itc) bit doesn't affect Content type states, however itc bit needs to be manupulated as well. In order to not expose additional property for itc, for sake of simplicity it was decided to bind those together in same "content type" property.

v4:

• Added it_content checking in

intel_digital_connector_atomic_check. Fixed documentation for new content type enum.

v5:

• Moved patch revision's description to commit messages.

v6:

• Minor naming fix for the content type enumeration string.

v7:

• Fix parameter name for documentation and parameter alignment in order not to get warning. Added Content Type description to new HDMI connector properties section.

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com

...

---

Documentation/gpu/drm-kms.rst | 6 +++ Documentation/gpu/kms-properties.csv | 1 + drivers/gpu/drm/drm_atomic.c | 17 +++++++ drivers/gpu/drm/drm_connector.c | 74 ++++++++++++++++++++++++++++ drivers/gpu/drm/drm_edid.c | 2 + include/drm/drm_connector.h | 18 +++++++ include/drm/drm_mode_config.h | 5 ++ include/uapi/drm/drm_mode.h | 7 +++ 8 files changed, 130 insertions(+)

diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst index 1dffd1ac4cd4..e233c2626bd0 100644 --- a/Documentation/gpu/drm-kms.rst +++ b/Documentation/gpu/drm-kms.rst @@ -517,6 +517,12 @@ Standard Connector Properties .. kernel-doc:: drivers/gpu/drm/drm_connector.c :doc: standard connector properties

+HDMI Specific Connector Properties +-----------------------------

+.. kernel-doc:: drivers/gpu/drm/drm_connector.c

• :doc: HDMI connector properties

Plane Composition Properties

diff --git a/Documentation/gpu/kms-properties.csv b/Documentation/gpu/kms-properties.csv index 6b28b014cb7d..3567c986bd7d 100644 --- a/Documentation/gpu/kms-properties.csv +++ b/Documentation/gpu/kms-properties.csv @@ -17,6 +17,7 @@ Owner Module/Drivers,Group,Property Name,Type,Property Values,Object attached,De ,Virtual GPU,“suggested X”,RANGE,"Min=0, Max=0xffffffff",Connector,property to suggest an X offset for a connector ,,“suggested Y”,RANGE,"Min=0, Max=0xffffffff",Connector,property to suggest an Y offset for a connector ,Optional,"""aspect ratio""",ENUM,"{ ""None"", ""4:3"", ""16:9"" }",Connector,TDB +,Optional,"""content type""",ENUM,"{ ""No Data"", ""Graphics"", ""Photo"", ""Cinema"", ""Game"" }",Connector,TBD i915,Generic,"""Broadcast RGB""",ENUM,"{ ""Automatic"", ""Full"", ""Limited 16:235"" }",Connector,"When this property is set to Limited 16:235 and CTM is set, the hardware will be programmed with the result of the multiplication of CTM by the limited range matrix to ensure the pixels normaly in the range 0..1.0 are remapped to the range 16/255..235/255." ,,“audio”,ENUM,"{ ""force-dvi"", ""off"", ""auto"", ""on"" }",Connector,TBD ,SDVO-TV,“mode”,ENUM,"{ ""NTSC_M"", ""NTSC_J"", ""NTSC_443"", ""PAL_B"" } etc.",Connector,TBD diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 7d25c42f22db..479499f5848e 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -1266,6 +1266,15 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector, state->link_status = val; } else if (property == config->aspect_ratio_property) { state->picture_aspect_ratio = val;

• } else if (property == config->content_type_property) {

• /*
  

•  * Lowest two bits of content_type property
  

control

•  * content_type, bit 2 controls itc bit.
  

•  * It was decided to have a single property
  

called

•  * content_type, instead of content_type and
  

itc.

•  */
  

• state->content_type = val & 3;
  

• state->it_content = val >> 2;
  

  } else if (property == connector->scaling_mode_property)

{ state->scaling_mode = val; } else if (property == connector-

...

content_protection_property) {

@@ -1351,6 +1360,14 @@ drm_atomic_connector_get_property(struct drm_connector *connector, *val = state->link_status; } else if (property == config->aspect_ratio_property) { *val = state->picture_aspect_ratio;

• } else if (property == config->content_type_property) {

• /*
  

•  * Lowest two bits of content_type property
  

control

•  * content_type, bit 2 controls itc bit.
  

•  * It was decided to have a single property
  

called

•  * content_type, instead of content_type and
  

itc.

•  */
  

• *val = state->content_type | (state->it_content
  

<< 2); } else if (property == connector->scaling_mode_property) { *val = state->scaling_mode; } else if (property == connector-

...

content_protection_property) {

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index b3cde897cd80..4f89602ebaf0 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -720,6 +720,14 @@ static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = { { DRM_MODE_PICTURE_ASPECT_16_9, "16:9" }, };

+static const struct drm_prop_enum_list drm_content_type_enum_list[] = {

• { DRM_MODE_CONTENT_TYPE_NO_DATA, "No Data" },
• { DRM_MODE_CONTENT_TYPE_GRAPHICS, "Graphics" },
• { DRM_MODE_CONTENT_TYPE_PHOTO, "Photo" },
• { DRM_MODE_CONTENT_TYPE_CINEMA, "Cinema" },
• { DRM_MODE_CONTENT_TYPE_GAME, "Game" },

+};

static const struct drm_prop_enum_list drm_panel_orientation_enum_list[] = { { DRM_MODE_PANEL_ORIENTATION_NORMAL, "Normal" }, { DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP, "Upside Down" }, @@ -996,6 +1004,45 @@ int drm_mode_create_dvi_i_properties(struct drm_device *dev) } EXPORT_SYMBOL(drm_mode_create_dvi_i_properties);

+/**

• • DOC: HDMI connector properties
• • content type (HDMI specific):
• • Indicates content type setting to be used in HDMI

infoframes to indicate

• • content type for the external device, so that it

adjusts it's display

• • settings accordingly.
• • The value of this property can be one of the

following:

• • • DRM_MODE_CONTENT_TYPE_NO_DATA = 0

• • Content type is unknown, it content(itc) bit
    

is cleared.

• • • DRM_MODE_CONTENT_TYPE_GRAPHICS = 4

• • Content type is graphics, it content(itc) bit
    

is set.

• • • DRM_MODE_CONTENT_TYPE_PHOTO = 5

• • Content type is photo, itc bit is set.
    

• • • DRM_MODE_CONTENT_TYPE_CINEMA = 6

• • Content type is cinema, itc bit is set.
    

• • • DRM_MODE_CONTENT_TYPE_GAME = 7

• • Content type is game, itc bit is set.
    

I wonder if we're trying to document the uabi or the internals here. If we are interested in the uabi, then we should document the enum value strings here. If on the other hand we're trying to document the internal details then we should keep the DRM_CONTENT_TYPE_* stuff. Maybe we want both? The raw numbers I think we should just throw out. While they do have some specific meaning in the case (matching the bits in the infoframe), I'm not sure that's important enough to include in the docs. We could add a comment next to the DRM_MODE_CONTENT_TYPE_* definitions.

Looks like the content protection prop is documenting the internals only as well. Hmm. Actually it looks like those things are defined in the uapi header. Oh and the scaling mode prop also does that. This is all setting a rather bad example for userspace. Or maybe we've given up on the "the string is the uabi" notion entirely?

Wrt documenting uapi: That should imo also be in there, but I realize it makes it a bit a mess. The kerneldoc should definitely align with other property docs to make sure it all looks consistent (i.e. enumeration list with the same indentation as all the other properties).

I guess it'd be good if we can aim for "the string is the uabi", but in practice people will hardcode. For cases where this is likely I think having the defines in the uapi header is probably better. -Daniel

So how should we proceed then? In fact those definitions(DRM_MODE_CONTENT_TYPE_*) are already in the uapi header(I've added them in the first patch), done same way as aspect ratio:

• Picture aspect ratio options */

#define DRM_MODE_PICTURE_ASPECT_NONE 0 #define DRM_MODE_PICTURE_ASPECT_4_3 1 #define DRM_MODE_PICTURE_ASPECT_16_9 2

This aren't for a property, but for flags in the drm_mode_modeinfo structure. That means it's required to have them as #defines.

/* HDMI content type and itc bit bound together for simplicity */ #define DRM_MODE_CONTENT_TYPE_NO_DATA 0 #define DRM_MODE_CONTENT_TYPE_GRAPHICS 4 #define DRM_MODE_CONTENT_TYPE_PHOTO 5 #define DRM_MODE_CONTENT_TYPE_CINEMA 6 #define DRM_MODE_CONTENT_TYPE_GAME 7

These hare are for properties, which means they're not really required since we have a getproperties ioctl to figure them out from the string.

Should I just throw out numbers from kernel doc for drm_connector.c? Or may be add the enum string values? The thing is that other properties documentation seems to be done in different manner, for example "content protection" documents the defined enum values, while "scaling mode" documents the strings themself.

Yeah that's what Ville pointed out, we already screwed up a bit with the content protection prop. For props, the string should be the uapi (but we'll probably have to deal with userspace hardcoding stuff in some cases no matter what).

So I would be happy to implement it correctly, however just need some clue or hint here :)

I hope the above helps in clarifying things - aspect ratio ain't a property. -Daniel

On Wed, May 02, 2018 at 09:08:11AM +0000, Lisovskiy, Stanislav wrote:

On Wed, 2018-05-02 at 10:15 +0200, Daniel Vetter wrote:

...

...

On Wed, May 02, 2018 at 08:09:24AM +0000, Lisovskiy, Stanislav wrote:

...

On Mon, 2018-04-30 at 17:00 +0200, Daniel Vetter wrote:

...

On Fri, Apr 27, 2018 at 10:40:00PM +0300, Ville Syrjälä wrote:

...

On Mon, Apr 23, 2018 at 10:34:41AM +0300, StanLis wrote:

...

From: Stanislav Lisovskiy stanislav.lisovskiy@intel.com

Added content_type property to drm_connector_state in order to properly handle external HDMI TV content-type setting.

v2:

• Moved helper function which attaches content type property to the drm core, as was suggested. Removed redundant connector state initialization.

v3:

• Removed caps in drm_content_type_enum_list. After some discussion it turned out that HDMI Spec 1.4 was wrongly assuming that IT Content(itc) bit doesn't

affect Content type states, however itc bit needs to be manupulated as well. In order to not expose additional property for itc, for sake of simplicity it was decided to bind those together in same "content type" property.

v4:

• Added it_content checking in

intel_digital_connector_atomic_check. Fixed documentation for new content type enum.

v5:

• Moved patch revision's description to commit messages.

v6:

• Minor naming fix for the content type enumeration string.

v7:

• Fix parameter name for documentation and parameter

alignment in order not to get warning. Added Content Type description to new HDMI connector properties section.

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel .com >

---

Documentation/gpu/drm-kms.rst | 6 +++ Documentation/gpu/kms-properties.csv | 1 + drivers/gpu/drm/drm_atomic.c | 17 +++++++ drivers/gpu/drm/drm_connector.c | 74 ++++++++++++++++++++++++++++ drivers/gpu/drm/drm_edid.c | 2 + include/drm/drm_connector.h | 18 +++++++ include/drm/drm_mode_config.h | 5 ++ include/uapi/drm/drm_mode.h | 7 +++ 8 files changed, 130 insertions(+)

diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst index 1dffd1ac4cd4..e233c2626bd0 100644 --- a/Documentation/gpu/drm-kms.rst +++ b/Documentation/gpu/drm-kms.rst @@ -517,6 +517,12 @@ Standard Connector Properties .. kernel-doc:: drivers/gpu/drm/drm_connector.c :doc: standard connector properties

+HDMI Specific Connector Properties +-----------------------------

+.. kernel-doc:: drivers/gpu/drm/drm_connector.c

• :doc: HDMI connector properties

Plane Composition Properties

diff --git a/Documentation/gpu/kms-properties.csv b/Documentation/gpu/kms-properties.csv index 6b28b014cb7d..3567c986bd7d 100644 --- a/Documentation/gpu/kms-properties.csv +++ b/Documentation/gpu/kms-properties.csv @@ -17,6 +17,7 @@ Owner Module/Drivers,Group,Property Name,Type,Property Values,Object attached,De ,Virtual GPU,“suggested X”,RANGE,"Min=0, Max=0xffffffff",Connector,property to suggest an X offset for a connector ,,“suggested Y”,RANGE,"Min=0, Max=0xffffffff",Connector,property to suggest an Y offset for a connector ,Optional,"""aspect ratio""",ENUM,"{ ""None"", ""4:3"", ""16:9"" }",Connector,TDB +,Optional,"""content type""",ENUM,"{ ""No Data"", ""Graphics"", ""Photo"", ""Cinema"", ""Game"" }",Connector,TBD i915,Generic,"""Broadcast RGB""",ENUM,"{ ""Automatic"", ""Full"", ""Limited 16:235"" }",Connector,"When this property is set to Limited 16:235 and CTM is set, the hardware will be programmed with the result of the multiplication of CTM by the limited range matrix to ensure the pixels normaly in the range 0..1.0 are remapped to the range 16/255..235/255." ,,“audio”,ENUM,"{ ""force-dvi"", ""off"", ""auto"", ""on"" }",Connector,TBD ,SDVO-TV,“mode”,ENUM,"{ ""NTSC_M"", ""NTSC_J"", ""NTSC_443"", ""PAL_B"" } etc.",Connector,TBD diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 7d25c42f22db..479499f5848e 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -1266,6 +1266,15 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector, state->link_status = val; } else if (property == config- >aspect_ratio_property) { state->picture_aspect_ratio = val;

• } else if (property == config-

>content_type_property) {

• /*
  

•  * Lowest two bits of content_type property
  

control

•  * content_type, bit 2 controls itc bit.
  

•  * It was decided to have a single property
  

called

•  * content_type, instead of content_type and
  

itc.

•  */
  

• state->content_type = val & 3;
  

• state->it_content = val >> 2;
  

  } else if (property == connector-

>scaling_mode_property) { state->scaling_mode = val; } else if (property == connector- > content_protection_property) {

@@ -1351,6 +1360,14 @@ drm_atomic_connector_get_property(struct drm_connector *connector, *val = state->link_status; } else if (property == config- >aspect_ratio_property) { *val = state->picture_aspect_ratio;

• } else if (property == config-

>content_type_property) {

• /*
  

•  * Lowest two bits of content_type property
  

control

•  * content_type, bit 2 controls itc bit.
  

•  * It was decided to have a single property
  

called

•  * content_type, instead of content_type and
  

itc.

•  */
  

• *val = state->content_type | (state-
  

>it_content << 2); } else if (property == connector- >scaling_mode_property) { *val = state->scaling_mode; } else if (property == connector- > content_protection_property) {

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index b3cde897cd80..4f89602ebaf0 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -720,6 +720,14 @@ static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = { { DRM_MODE_PICTURE_ASPECT_16_9, "16:9" }, };

+static const struct drm_prop_enum_list drm_content_type_enum_list[] = {

• { DRM_MODE_CONTENT_TYPE_NO_DATA, "No Data" },
• { DRM_MODE_CONTENT_TYPE_GRAPHICS, "Graphics" },
• { DRM_MODE_CONTENT_TYPE_PHOTO, "Photo" },
• { DRM_MODE_CONTENT_TYPE_CINEMA, "Cinema" },
• { DRM_MODE_CONTENT_TYPE_GAME, "Game" },

+};

static const struct drm_prop_enum_list drm_panel_orientation_enum_list[] = { { DRM_MODE_PANEL_ORIENTATION_NORMAL, "Normal"

}, { DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP, "Upsi de Down" }, @@ -996,6 +1004,45 @@ int drm_mode_create_dvi_i_properties(struct drm_device *dev) } EXPORT_SYMBOL(drm_mode_create_dvi_i_properties);

+/**

• • DOC: HDMI connector properties
• • content type (HDMI specific):
• • Indicates content type setting to be used in HDMI

infoframes to indicate

• • content type for the external device, so that it

adjusts it's display

• • settings accordingly.
• • The value of this property can be one of the

following:

• • • DRM_MODE_CONTENT_TYPE_NO_DATA = 0

• • Content type is unknown, it content(itc)
    

bit is cleared.

• • • DRM_MODE_CONTENT_TYPE_GRAPHICS = 4

• • Content type is graphics, it content(itc)
    

bit is set.

• • • DRM_MODE_CONTENT_TYPE_PHOTO = 5

• • Content type is photo, itc bit is set.
    

• • • DRM_MODE_CONTENT_TYPE_CINEMA = 6

• • Content type is cinema, itc bit is set.
    

• • • DRM_MODE_CONTENT_TYPE_GAME = 7

• • Content type is game, itc bit is set.
    

I wonder if we're trying to document the uabi or the internals here. If we are interested in the uabi, then we should document the enum value strings here. If on the other hand we're trying to document the internal details then we should keep the DRM_CONTENT_TYPE_* stuff. Maybe we want both? The raw numbers I think we should just throw out. While they do have some specific meaning in the case (matching the bits in the infoframe), I'm not sure that's important enough to include in the docs. We could add a comment next to the DRM_MODE_CONTENT_TYPE_* definitions.

Looks like the content protection prop is documenting the internals only as well. Hmm. Actually it looks like those things are defined in the uapi header. Oh and the scaling mode prop also does that. This is all setting a rather bad example for userspace. Or maybe we've given up on the "the string is the uabi" notion entirely?

Wrt documenting uapi: That should imo also be in there, but I realize it makes it a bit a mess. The kerneldoc should definitely align with other property docs to make sure it all looks consistent (i.e. enumeration list with the same indentation as all the other properties).

I guess it'd be good if we can aim for "the string is the uabi", but in practice people will hardcode. For cases where this is likely I think having the defines in the uapi header is probably better. -Daniel

So how should we proceed then? In fact those definitions(DRM_MODE_CONTENT_TYPE_*) are already in the uapi header(I've added them in the first patch), done same way as aspect ratio:

• Picture aspect ratio options */

#define DRM_MODE_PICTURE_ASPECT_NONE 0 #define DRM_MODE_PICTURE_ASPECT_4_3 1 #define DRM_MODE_PICTURE_ASPECT_16_9 2

This aren't for a property, but for flags in the drm_mode_modeinfo structure. That means it's required to have them as #defines.

Ok, honestly I thought aspect ratio is also a property, because it is created along with other drm connector properties in drm_connector.c:

static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = { { DRM_MODE_PICTURE_ASPECT_NONE, "Automatic" }, { DRM_MODE_PICTURE_ASPECT_4_3, "4:3" }, { DRM_MODE_PICTURE_ASPECT_16_9, "16:9" }, };

/**

• drm_mode_create_aspect_ratio_property - create aspect ratio property
• @dev: DRM device
• Called by a driver the first time it's needed, must be attached to

desired

• connectors.
• Returns:
• Zero on success, negative errno on failure.

*/ int drm_mode_create_aspect_ratio_property(struct drm_device *dev) { if (dev->mode_config.aspect_ratio_property) return 0;

   dev->mode_config.aspect_ratio_property =
            drm_property_create_enum(dev, 0, "aspect ratio",
                           drm_aspect_ratio_enum_list,
                           ARRAY_SIZE(drm_aspect_ratio_enum_list));

    if (dev->mode_config.aspect_ratio_property == NULL)
          return -ENOMEM;

    return 0;

}

And basically as I see drm_atomic_connector_set_property can set it either.

Oh, oops, I totally forgot that we have this. I guess we've been bad at this a few times already. Other properties with hardcoded values are DPMS, scaling and probably a few more.

So not sure what to do here. I guess you're current code is ok. -Daniel