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drm/doc: Interlink color manager docs better 

Motivated by a request from Eric.

v2: Take in suggestions from Lionel

Cc: Eric Anholt <eric@anholt.net>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170412152006.12233-1-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2017-04-12 17:20:06 +02:00
parent ccb92b945e
commit 2e38178e23
3 changed files with 36 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/drm_atomic_helper.c
View File

@ -3517,7 +3517,8 @@ EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);
*
* Implements support for legacy gamma correction table for drivers
* that support color management through the DEGAMMA_LUT/GAMMA_LUT
* properties.
* properties. See drm_crtc_enable_color_mgmt() and the containing chapter for
* how the atomic color management and gamma tables work.
*/
int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
u16 *red, u16 *green, u16 *blue,

9
drivers/gpu/drm/drm_color_mgmt.c
View File

@ -43,7 +43,8 @@
*
* Setting this to NULL (blob property value set to 0) means a
* linear/pass-thru gamma table should be used. This is generally the
* driver boot-up state too.
* driver boot-up state too. Drivers can access this blob through
* &drm_crtc_state.degamma_lut.
*
* “DEGAMMA_LUT_SIZE”:
* Unsinged range property to give the size of the lookup table to be set
@ -60,7 +61,8 @@
*
* Setting this to NULL (blob property value set to 0) means a
* unit/pass-thru matrix should be used. This is generally the driver
* boot-up state too.
* boot-up state too. Drivers can access the blob for the color conversion
* matrix through &drm_crtc_state.ctm.
*
* “GAMMA_LUT”:
* Blob property to set the gamma lookup table (LUT) mapping pixel data
@ -72,7 +74,8 @@
*
* Setting this to NULL (blob property value set to 0) means a
* linear/pass-thru gamma table should be used. This is generally the
* driver boot-up state too.
* driver boot-up state too. Drivers can access this blob through
* &drm_crtc_state.gamma_lut.
*
* “GAMMA_LUT_SIZE”:
* Unsigned range property to give the size of the lookup table to be set

34
include/drm/drm_crtc.h
View File

@ -93,11 +93,6 @@ struct drm_plane_helper_funcs;
* @adjusted_mode: for use by helpers and drivers to compute adjusted mode timings
* @mode: current mode timings
* @mode_blob: &drm_property_blob for @mode
* @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
* @state: backpointer to global drm_atomic_state
*
* Note that the distinction between @enable and @active is rather subtile:
@ -144,9 +139,30 @@ 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 */
/**
* @degamma_lut:
*
* Lookup table for converting framebuffer pixel data before apply the
* color conversion matrix @ctm. See drm_crtc_enable_color_mgmt(). The
* blob (if not NULL) is an array of &struct drm_color_lut.
*/
struct drm_property_blob *degamma_lut;
/**
* @ctm:
*
* Color transformation matrix. See drm_crtc_enable_color_mgmt(). The
* blob (if not NULL) is a &struct drm_color_ctm.
*/
struct drm_property_blob *ctm;
/**
* @gamma_lut:
*
* Lookup table for converting pixel data after the color conversion
* matrix @ctm. See drm_crtc_enable_color_mgmt(). The blob (if not
* NULL) is an array of &struct drm_color_lut.
*/
struct drm_property_blob *gamma_lut;
/**
@ -313,6 +329,12 @@ struct drm_crtc_funcs {
*
* This callback is optional.
*
* Atomic drivers who want to support gamma tables should implement the
* atomic color management support, enabled by calling
* drm_crtc_enable_color_mgmt(), which then supports the legacy gamma
* interface through the drm_atomic_helper_legacy_gamma_set()
* compatibility implementation.
*
* NOTE:
*
* Drivers that support gamma tables and also fbdev emulation through