[PATCH 3/4] drm/exynos/mixer: planes are not disabled by setting dma_addr to zero

[djkurtz@chromium.org (Daniel Kurtz)]

Planes are disabled by calling the win_mode_disable() callback, not by
calling win_mode_commit()[->vp_video_buffer] with dma_addr set to zero.

Thus, the comment in the pixel_format switch default clause is obsolete,
we should always check if the pixel_format is supported, and therefore,
since the driver does not actually supported single-buffer formats,
buf_num will always be 2, and we drop the broken 1-buffer case.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
---
 drivers/gpu/drm/exynos/exynos_mixer.c | 17 +++--------------
 1 file changed, 3 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index 40cf39b..b252ec7 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -382,7 +382,6 @@ static void vp_video_buffer(struct mixer_context *ctx, int win)
 	unsigned long flags;
 	struct hdmi_win_data *win_data;
 	unsigned int x_ratio, y_ratio;
-	unsigned int buf_num = 1;
 	dma_addr_t luma_addr[2], chroma_addr[2];
 	bool tiled_mode = false;
 	bool crcb_mode = false;
@@ -393,16 +392,12 @@ static void vp_video_buffer(struct mixer_context *ctx, int win)
 	switch (win_data->pixel_format) {
 	case DRM_FORMAT_NV12MT:
 		tiled_mode = true;
+		/* fall through */
 	case DRM_FORMAT_NV12:
 		crcb_mode = false;
-		buf_num = 2;
 		break;
 	/* TODO: single buffer format NV12, NV21 */
 	default:
-		/* ignore pixel format at disable time */
-		if (!win_data->dma_addr)
-			break;
-
 		DRM_ERROR("pixel format for vp is wrong [%d].\n",
 				win_data->pixel_format);
 		return;
@@ -412,14 +407,8 @@ static void vp_video_buffer(struct mixer_context *ctx, int win)
 	x_ratio = (win_data->src_width << 16) / win_data->crtc_width;
 	y_ratio = (win_data->src_height << 16) / win_data->crtc_height;
 
-	if (buf_num == 2) {
-		luma_addr[0] = win_data->dma_addr;
-		chroma_addr[0] = win_data->chroma_dma_addr;
-	} else {
-		luma_addr[0] = win_data->dma_addr;
-		chroma_addr[0] = win_data->dma_addr
-			+ (win_data->fb_width * win_data->fb_height);
-	}
+	luma_addr[0] = win_data->dma_addr;
+	chroma_addr[0] = win_data->chroma_dma_addr;
 
 	if (win_data->scan_flags & DRM_MODE_FLAG_INTERLACE) {
 		ctx->interlace = true;
-- 
1.9.1.423.g4596e3a