drm/exynos: mixer: fix chroma comment in vp_video_buffer()

The current comment sounds like the division op is done to
compensate for some hardware erratum. But the chroma plane
having half the height of the luma plane is just the way
NV12/NV21 is defined, so clarify this behaviour.

Signed-off-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index a998a8dd783cbc347792f88d56141ca34e4716e1..cbd949a989f9f04b891421906f49ec275071b9b6 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -532,7 +532,7 @@ static void vp_video_buffer(struct mixer_context *ctx,
        /* setting size of input image */
        vp_reg_write(res, VP_IMG_SIZE_Y, VP_IMG_HSIZE(fb->pitches[0]) |
                VP_IMG_VSIZE(fb->height));
-       /* chroma height has to reduced by 2 to avoid chroma distorions */
+       /* chroma plane for NV12/NV21 is half the height of the luma plane */
        vp_reg_write(res, VP_IMG_SIZE_C, VP_IMG_HSIZE(fb->pitches[0]) |
                VP_IMG_VSIZE(fb->height / 2));