From: "uma.shankar at intel.com (Uma Shankar)" <uma.shan...@intel.com>
Define a helper function to set legacy gamma table size for planes. (am from https://patchwork.kernel.org/patch/9971343/) Change-Id: I3d0c3e71d92300259cdfcebed4349207f64e4083 Signed-off-by: Uma Shankar <uma.shankar at intel.com> --- drivers/gpu/drm/drm_color_mgmt.c | 41 ++++++++++++++++++++++++++++++++ include/drm/drm_color_mgmt.h | 3 +++ include/drm/drm_plane.h | 4 ++++ 3 files changed, 48 insertions(+) diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c index 0d002b045bd26..8f360b3ae0f24 100644 --- a/drivers/gpu/drm/drm_color_mgmt.c +++ b/drivers/gpu/drm/drm_color_mgmt.c @@ -203,6 +203,47 @@ int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc, } EXPORT_SYMBOL(drm_mode_crtc_set_gamma_size); +/** + * drm_mode_plane_set_gamma_size - set the gamma table size + * @plane: Plane to set the gamma table size for + * @gamma_size: size of the gamma table + * + * Drivers which support gamma tables should set this to the supported gamma + * table size when initializing the Plane. Currently the drm core only supports + * a fixed gamma table size. + * + * Returns: + * Zero on success, negative errno on failure. + */ +int drm_mode_plane_set_gamma_size(struct drm_plane *plane, + int gamma_size) +{ + uint16_t *r_base, *g_base, *b_base; + int i; + + plane->gamma_size = gamma_size; + + plane->gamma_store = kcalloc(gamma_size, sizeof(uint16_t) * 3, + GFP_KERNEL); + if (!plane->gamma_store) { + plane->gamma_size = 0; + return -ENOMEM; + } + + r_base = plane->gamma_store; + g_base = r_base + gamma_size; + b_base = g_base + gamma_size; + for (i = 0; i < gamma_size; i++) { + r_base[i] = i << 8; + g_base[i] = i << 8; + b_base[i] = i << 8; + } + + + return 0; +} +EXPORT_SYMBOL(drm_mode_plane_set_gamma_size); + /** * drm_mode_gamma_set_ioctl - set the gamma table * @dev: DRM device diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h index 155a9ba38471c..2f59c820e148c 100644 --- a/include/drm/drm_color_mgmt.h +++ b/include/drm/drm_color_mgmt.h @@ -42,4 +42,7 @@ void drm_plane_enable_color_mgmt(struct drm_plane *plane, bool plane_has_ctm, uint plane_gamma_lut_size); +int drm_mode_plane_set_gamma_size(struct drm_plane *plane, + int plane_gamma_size); + #endif diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h index acabb85009a14..18d09eacbcd7d 100644 --- a/include/drm/drm_plane.h +++ b/include/drm/drm_plane.h @@ -585,6 +585,10 @@ struct drm_plane { struct drm_property *zpos_property; struct drm_property *rotation_property; + + /* Legacy FB Plane gamma size for reporting to userspace */ + uint32_t gamma_size; + uint16_t *gamma_store; }; #define obj_to_plane(x) container_of(x, struct drm_plane, base) -- 2.16.1.291.g4437f3f132-goog _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
