[media] vivid-tpg: don't add offset when switching to monochrome

The grayscale values are still full range sRGB, so don't add the
limited range offset.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/platform/vivid/vivid-tpg.c b/drivers/media/platform/vivid/vivid-tpg.c
index 8f45568..145b6ff 100644 (file)
--- a/drivers/media/platform/vivid/vivid-tpg.c
+++ b/drivers/media/platform/vivid/vivid-tpg.c
@@ -530,7 +530,7 @@ static void precalculate_color(struct tpg_data *tpg, int k)
        if (tpg->qual == TPG_QUAL_GRAY) {
                /* Rec. 709 Luma function */
                /* (0.2126, 0.7152, 0.0722) * (255 * 256) */
-               r = g = b = ((13879 * r + 46688 * g + 4713 * b) >> 16) + (16 << 4);
+               r = g = b = (13879 * r + 46688 * g + 4713 * b) >> 16;
        }
 
        /*