[PATCH v3] media: mediatek: vcodec: Handle VP9 superframe bitstream with 8 sub-frames

[Irui Wang <irui.wang@xxxxxxxxxxxx>]

The VP9 bitstream uses superframes, which each contain 8 sub-frames,
enable accessing the last superframe by increasing the range of the index
vaidation as the maximum number of superframes is 8 and not 7, so that the
last sub-frame can be decoded normally with stateful vp9 decoder.

Signed-off-by: Irui Wang <irui.wang@xxxxxxxxxxxx>
---
changed with v2:
 - update commit message only.

changed with v1:
 - add a new define 'VP9_MAX_SUPER_FRAMES_NUM' for superframes.
---
 .../mediatek/vcodec/decoder/vdec/vdec_vp9_if.c        | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_if.c b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_if.c
index 55355fa70090..039082f600c8 100644
--- a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_if.c
+++ b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_if.c
@@ -16,6 +16,7 @@
 #include "../vdec_drv_base.h"
 #include "../vdec_vpu_if.h"
 
+#define VP9_MAX_SUPER_FRAMES_NUM 8
 #define VP9_SUPER_FRAME_BS_SZ 64
 #define MAX_VP9_DPB_SIZE	9
 
@@ -133,11 +134,11 @@ struct vp9_sf_ref_fb {
  */
 struct vdec_vp9_vsi {
 	unsigned char sf_bs_buf[VP9_SUPER_FRAME_BS_SZ];
-	struct vp9_sf_ref_fb sf_ref_fb[VP9_MAX_FRM_BUF_NUM-1];
+	struct vp9_sf_ref_fb sf_ref_fb[VP9_MAX_SUPER_FRAMES_NUM];
 	int sf_next_ref_fb_idx;
 	unsigned int sf_frm_cnt;
-	unsigned int sf_frm_offset[VP9_MAX_FRM_BUF_NUM-1];
-	unsigned int sf_frm_sz[VP9_MAX_FRM_BUF_NUM-1];
+	unsigned int sf_frm_offset[VP9_MAX_SUPER_FRAMES_NUM];
+	unsigned int sf_frm_sz[VP9_MAX_SUPER_FRAMES_NUM];
 	unsigned int sf_frm_idx;
 	unsigned int sf_init;
 	struct vdec_fb fb;
@@ -526,7 +527,7 @@ static void vp9_swap_frm_bufs(struct vdec_vp9_inst *inst)
 	/* if this super frame and it is not last sub-frame, get next fb for
 	 * sub-frame decode
 	 */
-	if (vsi->sf_frm_cnt > 0 && vsi->sf_frm_idx != vsi->sf_frm_cnt - 1)
+	if (vsi->sf_frm_cnt > 0 && vsi->sf_frm_idx != vsi->sf_frm_cnt)
 		vsi->sf_next_ref_fb_idx = vp9_get_sf_ref_fb(inst);
 }
 
@@ -735,7 +736,7 @@ static void get_free_fb(struct vdec_vp9_inst *inst, struct vdec_fb **out_fb)
 
 static int validate_vsi_array_indexes(struct vdec_vp9_inst *inst,
 		struct vdec_vp9_vsi *vsi) {
-	if (vsi->sf_frm_idx >= VP9_MAX_FRM_BUF_NUM - 1) {
+	if (vsi->sf_frm_idx > VP9_MAX_SUPER_FRAMES_NUM) {
 		mtk_vdec_err(inst->ctx, "Invalid vsi->sf_frm_idx=%u.", vsi->sf_frm_idx);
 		return -EIO;
 	}
-- 
2.18.0