Define a helper function to set legacy gamma table
size for planes.
Signed-off-by: Uma Shankar <uma.shankar@xxxxxxxxx>
---
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 fe09827..8aef6b5 100644
--- a/drivers/gpu/drm/drm_color_mgmt.c
+++ b/drivers/gpu/drm/drm_color_mgmt.c
@@ -204,6 +204,47 @@ 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
* @data: ioctl data
diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
index 155a9ba..2f59c82 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 172d0c1..7dc8e53 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -575,6 +575,10 @@ 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)
--
1.7.9.5
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