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drm: introduce pipe color correction properties

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Patch based on a previous series by Shashank Sharma.

This introduces optional properties to enable color correction at the
pipe level. It relies on 3 transformations applied to every pixels
displayed. First a lookup into a degamma table, then a multiplication
of the rgb components by a 3x3 matrix and finally another lookup into
a gamma table.

The following properties can be added to a pipe :
  - DEGAMMA_LUT : blob containing degamma LUT
  - DEGAMMA_LUT_SIZE : number of elements in DEGAMMA_LUT
  - CTM : transformation matrix applied after the degamma LUT
  - GAMMA_LUT : blob containing gamma LUT
  - GAMMA_LUT_SIZE : number of elements in GAMMA_LUT

DEGAMMA_LUT_SIZE and GAMMA_LUT_SIZE are read only properties, set by
the driver to tell userspace applications what sizes should be the
lookup tables in DEGAMMA_LUT and GAMMA_LUT.

A helper is also provided so legacy gamma correction is redirected
through these new properties.

v2: Register LUT size properties as range

v3: Fix round in drm_color_lut_get_value() helper
    More docs on how degamma/gamma properties are used

v4: Update contributors

v5: Rename CTM_MATRIX property to CTM (Doh!)
    Add legacy gamma_set atomic helper
    Describe CTM/LUT acronyms in the kernel doc

v6: Fix missing blob unref in drm_atomic_helper_crtc_reset

Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Kumar, Kiran S <kiran.s.kumar@intel.com>
Signed-off-by: Kausal Malladi <kausalmalladi@gmail.com>
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Acked-by: Rob Bradford <robert.bradford@intel.com>
[danvet: CrOS maintainers are also happy with the userspacde side:
https://codereview.chromium.org/1182063002/ ]
Reviewed-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1456506302-640-4-git-send-email-lionel.g.landwerlin@intel.com
This commit is contained in:
Lionel Landwerlin
2016-02-26 17:05:00 +00:00
committed by Daniel Vetter
parent 9b8d1e53f6
commit 5488dc16fd
9 changed files with 386 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
include/drm/drm_crtc.h
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@@ -305,6 +305,8 @@ struct drm_plane_helper_funcs;
* @mode_changed: crtc_state->mode or crtc_state->enable has been changed
* @active_changed: crtc_state->active has been toggled.
* @connectors_changed: connectors to this crtc have been updated
* @color_mgmt_changed: color management properties have changed (degamma or
* gamma LUT or CSC matrix)
* @plane_mask: bitmask of (1 << drm_plane_index(plane)) of attached planes
* @connector_mask: bitmask of (1 << drm_connector_index(connector)) of attached connectors
* @encoder_mask: bitmask of (1 << drm_encoder_index(encoder)) of attached encoders
@@ -312,6 +314,11 @@ struct drm_plane_helper_funcs;
* update to ensure framebuffer cleanup isn't done too early
* @adjusted_mode: for use by helpers and drivers to compute adjusted mode timings
* @mode: current mode timings
* @degamma_lut: Lookup table for converting framebuffer pixel data
* before apply the conversion matrix
* @ctm: Transformation matrix
* @gamma_lut: Lookup table for converting pixel data after the
* conversion matrix
* @event: optional pointer to a DRM event to signal upon completion of the
* state update
* @state: backpointer to global drm_atomic_state
@@ -333,6 +340,7 @@ struct drm_crtc_state {
bool mode_changed : 1;
bool active_changed : 1;
bool connectors_changed : 1;
bool color_mgmt_changed : 1;
/* attached planes bitmask:
* WARNING: transitional helpers do not maintain plane_mask so
@@ -355,6 +363,11 @@ struct drm_crtc_state {
/* blob property to expose current mode to atomic userspace */
struct drm_property_blob *mode_blob;
/* blob property to expose color management to userspace */
struct drm_property_blob *degamma_lut;
struct drm_property_blob *ctm;
struct drm_property_blob *gamma_lut;
struct drm_pending_vblank_event *event;
struct drm_atomic_state *state;
@@ -757,7 +770,7 @@ struct drm_crtc {
int x, y;
const struct drm_crtc_funcs *funcs;
/* CRTC gamma size for reporting to userspace */
/* Legacy FB CRTC gamma size for reporting to userspace */
uint32_t gamma_size;
uint16_t *gamma_store;
@@ -2027,6 +2040,15 @@ struct drm_mode_config_funcs {
* @property_blob_list: list of all the blob property objects
* @blob_lock: mutex for blob property allocation and management
* @*_property: core property tracking
* @degamma_lut_property: LUT used to convert the framebuffer's colors to linear
* gamma
* @degamma_lut_size_property: size of the degamma LUT as supported by the
* driver (read-only)
* @ctm_property: Matrix used to convert colors after the lookup in the
* degamma LUT
* @gamma_lut_property: LUT used to convert the colors, after the CSC matrix, to
* the gamma space of the connected screen (read-only)
* @gamma_lut_size_property: size of the gamma LUT as supported by the driver
* @preferred_depth: preferred RBG pixel depth, used by fb helpers
* @prefer_shadow: hint to userspace to prefer shadow-fb rendering
* @async_page_flip: does this device support async flips on the primary plane?
@@ -2128,6 +2150,13 @@ struct drm_mode_config {
struct drm_property *aspect_ratio_property;
struct drm_property *dirty_info_property;
/* Optional color correction properties */
struct drm_property *degamma_lut_property;
struct drm_property *degamma_lut_size_property;
struct drm_property *ctm_property;
struct drm_property *gamma_lut_property;
struct drm_property *gamma_lut_size_property;
/* properties for virtual machine layout */
struct drm_property *suggested_x_property;
struct drm_property *suggested_y_property;
@@ -2550,6 +2579,21 @@ static inline struct drm_property *drm_property_find(struct drm_device *dev,
return mo ? obj_to_property(mo) : NULL;
}
/*
* Extract a degamma/gamma LUT value provided by user and round it to the
* precision supported by the hardware.
*/
static inline uint32_t drm_color_lut_extract(uint32_t user_input,
uint32_t bit_precision)
{
uint32_t val = user_input + (1 << (16 - bit_precision - 1));
uint32_t max = 0xffff >> (16 - bit_precision);
val >>= 16 - bit_precision;
return clamp_val(val, 0, max);
}
/* Plane list iterator for legacy (overlay only) planes. */
#define drm_for_each_legacy_plane(plane, dev) \
list_for_each_entry(plane, &(dev)->mode_config.plane_list, head) \