From: Rob Clark <r...@ti.com> A bitmask property is similar to an enum. The enum value is a bit position (0-63), and valid property values consist of a mask of zero or more of (1 << enum_val[n]).
TODO: word commit msg better TODO: maybe "flags" would be a better name for the property type? --- See https://github.com/robclark/kernel-omap4/commit/970b7bb95993fc43b4977976bf8005dc2e1a4ad3#L6R411 for an example usage. In this case combinations of "x-invert", "y-invert" and "xy-flip" can express all possible combinations of rotations of multiples of 90 degrees plus mirroring. Which is sufficient for an xrandr v1.2 rotation support. For arbitrary transforms in xrandr v1.3 a different property with a transform matrix (if supported by the driver) should be used. Note: I've not finished updating libdrm and ddx driver to use this yet, so other than compile and boot test, you can consider this as untested. But I figure that it is at least worthwhile to send as an RFC at this point to get feedback. drivers/gpu/drm/drm_crtc.c | 46 +++++++++++++++++++++++++++++++++++++++++-- include/drm/drm_crtc.h | 3 ++ include/drm/drm_mode.h | 1 + 3 files changed, 47 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 95c7ab2..2b462f6 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -2713,6 +2713,33 @@ struct drm_property *drm_property_create_enum(struct drm_device *dev, int flags, } EXPORT_SYMBOL(drm_property_create_enum); +struct drm_property *drm_property_create_bitmask(struct drm_device *dev, + int flags, const char *name, + const struct drm_prop_enum_list *props, int num_values) +{ + struct drm_property *property; + int i, ret; + + flags |= DRM_MODE_PROP_BITMASK; + + property = drm_property_create(dev, flags, name, num_values); + if (!property) + return NULL; + + for (i = 0; i < num_values; i++) { + ret = drm_property_add_enum(property, i, + props[i].type, + props[i].name); + if (ret) { + drm_property_destroy(dev, property); + return NULL; + } + } + + return property; +} +EXPORT_SYMBOL(drm_property_create_bitmask); + struct drm_property *drm_property_create_range(struct drm_device *dev, int flags, const char *name, uint64_t min, uint64_t max) @@ -2737,7 +2764,14 @@ int drm_property_add_enum(struct drm_property *property, int index, { struct drm_property_enum *prop_enum; - if (!(property->flags & DRM_MODE_PROP_ENUM)) + if (!(property->flags & (DRM_MODE_PROP_ENUM | DRM_MODE_PROP_BITMASK))) + return -EINVAL; + + /* + * Bitmask enum properties have the additional constraint of values + * from 0 to 63 + */ + if ((property->flags & DRM_MODE_PROP_BITMASK) && (value > 63)) return -EINVAL; if (!list_empty(&property->enum_blob_list)) { @@ -2881,7 +2915,7 @@ int drm_mode_getproperty_ioctl(struct drm_device *dev, } property = obj_to_property(obj); - if (property->flags & DRM_MODE_PROP_ENUM) { + if (property->flags & (DRM_MODE_PROP_ENUM | DRM_MODE_PROP_BITMASK)) { list_for_each_entry(prop_enum, &property->enum_blob_list, head) enum_count++; } else if (property->flags & DRM_MODE_PROP_BLOB) { @@ -2906,7 +2940,7 @@ int drm_mode_getproperty_ioctl(struct drm_device *dev, } out_resp->count_values = value_count; - if (property->flags & DRM_MODE_PROP_ENUM) { + if (property->flags & (DRM_MODE_PROP_ENUM | DRM_MODE_PROP_BITMASK)) { if ((out_resp->count_enum_blobs >= enum_count) && enum_count) { copied = 0; enum_ptr = (struct drm_mode_property_enum __user *)(unsigned long)out_resp->enum_blob_ptr; @@ -3063,6 +3097,12 @@ static bool drm_property_change_is_valid(struct drm_property *property, if (value > property->values[1]) return false; return true; + } else if (property->flags & DRM_MODE_PROP_BITMASK) { + int i; + __u64 valid_mask = 0; + for (i = 0; i < property->num_values; i++) + valid_mask |= (1 << property->values[i]); + return !(value & ~valid_mask); } else { int i; for (i = 0; i < property->num_values; i++) diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index 32e9c51..28e9a78 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -940,6 +940,9 @@ extern struct drm_property *drm_property_create_enum(struct drm_device *dev, int const char *name, const struct drm_prop_enum_list *props, int num_values); +struct drm_property *drm_property_create_bitmask(struct drm_device *dev, + int flags, const char *name, + const struct drm_prop_enum_list *props, int num_values); struct drm_property *drm_property_create_range(struct drm_device *dev, int flags, const char *name, uint64_t min, uint64_t max); diff --git a/include/drm/drm_mode.h b/include/drm/drm_mode.h index de5de2a..3190dfe 100644 --- a/include/drm/drm_mode.h +++ b/include/drm/drm_mode.h @@ -228,6 +228,7 @@ struct drm_mode_get_connector { #define DRM_MODE_PROP_IMMUTABLE (1<<2) #define DRM_MODE_PROP_ENUM (1<<3) /* enumerated type with text strings */ #define DRM_MODE_PROP_BLOB (1<<4) +#define DRM_MODE_PROP_BITMASK (1<<5) /* bitmask of enumerated types */ struct drm_mode_property_enum { __u64 value; -- 1.7.9.1
