- /*
- * FIXME: The pipe degamma table in geminilake doesn't support
- * different values per channel, so this just loads a linear table.
- */
- for (i = 0; i < lut_size; i++) {
- u32 v = (i * (1 << 16)) / (lut_size - 1);
+ if (crtc_state->base.degamma_lut) {
+ struct drm_color_lut *lut = crtc_state->base.degamma_lut->data;
+
+ for (i = 0; i < lut_size; i++) {
+ /*
+ * First 33 entries represent range from 0 to 1.0
+ * 34th and 35th entry will represent extended range
+ * inputs 3.0 and 7.0 respectively, currently clamped
+ * at 1.0. Since the precision is 16bit, the user
+ * value can be directly filled to register.
+ * The pipe degamma table in GLK+ onwards doesn't
+ * support different values per channel, so this just
+ * programs green value which will be equal to Red and
+ * Blue into the lut registers.
+ * ToDo: Extend to max 7.0. Enable 32 bit input value
+ * as compared to just 16 to achieve this.
+ */
+ I915_WRITE(PRE_CSC_GAMC_DATA(pipe), lut[i].green);
+ }
+ } else {
+ /* load a linear table. */
+ for (i = 0; i < lut_size; i++) {
+ u32 v = (i * (1 << 16)) / (lut_size - 1);