drm/mediatek: Add gamma correction.
Add gamma set function to correct brightness values.
It applies arbitrary mapping curve to compensate the
incorrect transfer function of the panel.
Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
index 81e5566..d332564 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
@@ -19,6 +19,7 @@
#include "mtk_drm_plane.h"
#define OVL_LAYER_NR 4
+#define MTK_LUT_SIZE 512
int mtk_drm_crtc_enable_vblank(struct drm_device *drm, unsigned int pipe);
void mtk_drm_crtc_disable_vblank(struct drm_device *drm, unsigned int pipe);