On Wed, 02 May 2018, StanLis <stanislav.lisovskiy@xxxxxxxxx> wrote:
> From: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
>
> 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.
>
> v8:
> * Thrown away unneeded numbers from HDMI content-type property
> description. Switch to strings desription instead of plain
> definitions.
>
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
> ---
> 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 | 76 +++++++++++++++++++++++++++-
> 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, 131 insertions(+), 1 deletion(-)
>
> 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 07ed22ea3bd6..bfde04eddd14 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 3d9ae057a6cd..046fc5249859 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -1270,6 +1270,15 @@ 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.
Who decided? I was trying to look through the history, but couldn't find
the review discussion on this part.
This approach encodes meaning to bits in the property value, while no
such promise is actually made in the property interface. Do you expect
to support graphics, photo, cinema, game with and without itc?
Is the intention to be able to extend this later on? If yes, why is itc
in bit 2 instead of e.g. bit 0, so the content-type could actually grow?
> + */
> + state->content_type = val & 3;
> + state->it_content = val >> 2;
I'm mostly asking because this is really confusing considering the
property value definitions, and should IMO be written in terms of the
macros, respecting SPOT, instead of adding magic numbers here.
Also, later on you set frame->content_type = HDMI_CONTENT_TYPE_GRAPHICS,
which is inconsistent with the masking above.
BR,
Jani.
PS. Please wait for the discussion to settle on this before sending
another version. Accumulating tons of revisions of the patch does not
make it move any faster.
> } else if (property == connector->scaling_mode_property) {
> state->scaling_mode = val;
> } else if (property == connector->content_protection_property) {
> @@ -1355,6 +1364,14 @@ 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..49941d2bd0fe 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:
> + *
> + * No Data:
> + * Content type is unknown, it content(itc) bit is cleared.
> + * Graphics:
> + * Content type is graphics, it content(itc) bit is set.
> + * Photo:
> + * Content type is photo, itc bit is set.
> + * Cinema:
> + * Content type is cinema, itc bit is set.
> + * Game:
> + * 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
> @@ -1150,7 +1197,7 @@ EXPORT_SYMBOL(drm_mode_create_scaling_mode_property);
> *
> * Returns:
> * Zero on success, negative errno on failure.
> - */
> + */
> int drm_connector_attach_scaling_mode_property(struct drm_connector *connector,
> u32 scaling_mode_mask)
> {
> @@ -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 \
--
Jani Nikula, Intel Open Source Technology Center
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