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backend-drm: Add 'link bpc' connector property

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The 'link bpc' DRM connector property can be used to retrieve the
physical bpc value.

This property can be used to find out the physical link value as
drivers will try to lower the bpc value when creaing an optimal output.

If we detect change we would notify the user if the value set with 'max
bpc' would be different than that of 'link bpc'.

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
This commit is contained in:
Marius Vlad 2025-10-21 12:40:45 +00:00
parent 8ea328471b
commit a37b496737
3 changed files with 25 additions and 0 deletions
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1
libweston/backend-drm/drm-kms-enums.h
View file

@ -124,6 +124,7 @@ enum wdrm_connector_property {
WDRM_CONNECTOR_CONTENT_TYPE,
WDRM_CONNECTOR_COLORSPACE,
WDRM_CONNECTOR_VRR_CAPABLE,
WDRM_CONNECTOR_LINK_BPC,
WDRM_CONNECTOR__COUNT
};

23
libweston/backend-drm/drm.c
View file

@ -3891,6 +3891,26 @@ drm_connector_find_property_by_id(struct drm_connector *connector,
return prop;
}
static void
weston_head_verify_bpc_status(struct drm_head *head)
{
unsigned int link_bpc;
unsigned int current_max_bpc;
link_bpc = drm_property_get_value(&head->connector.props[WDRM_CONNECTOR_LINK_BPC],
head->connector.props_drm, 0);
/* inherited_max_bpc is used only at head creation or if max_bpc
* is not set by the user. Further more user might supply a different
* max_bpc than one in the range. */
current_max_bpc = drm_property_get_value(&head->connector.props[WDRM_CONNECTOR_MAX_BPC],
head->connector.props_drm, 0);
if (current_max_bpc != link_bpc)
weston_log("WARNING: max bpc was set to %u but current link bpc "
"set to %u\n", current_max_bpc, link_bpc);
}
static void
drm_backend_update_conn_props(struct drm_backend *b,
struct drm_device *device,
@ -3918,6 +3938,9 @@ drm_backend_update_conn_props(struct drm_backend *b,
weston_head_set_content_protection_status(&head->base,
drm_head_get_current_protection(head));
}
if (conn_prop == WDRM_CONNECTOR_LINK_BPC)
weston_head_verify_bpc_status(head);
}
static int

1
libweston/backend-drm/kms.c
View file

@ -252,6 +252,7 @@ const struct drm_property_info connector_props[] = {
[WDRM_CONNECTOR_VRR_CAPABLE] = {
.name = "vrr_capable",
},
[WDRM_CONNECTOR_LINK_BPC] = { .name = "link bpc", },
};
const struct drm_property_info crtc_props[] = {