[PATCH 0/2] media: cedrus: a couple of fixes

[Jernej Skrabec]

This short series fixes two issues:
1. conformance to v4l2 request api specifications
2. regression in h264 video decoding introduced during h264 api rework

Please take a look.

Best regards,
Jernej

Jernej Skrabec (2):
media: cedrus: Remove checking for required controls
media: cedrus: Fix H264 decoding

drivers/staging/media/sunxi/cedrus/cedrus.c | 49 -------------------
drivers/staging/media/sunxi/cedrus/cedrus.h | 1 -
.../staging/media/sunxi/cedrus/cedrus_h264.c | 2 +-
3 files changed, 1 insertion(+), 51 deletions(-)

--
2.29.2

[Jernej Skrabec]

According to v4l2 request api specifications, it's allowed to skip
control if its content isn't changed for performance reasons. Cedrus
driver predates that, so it has implemented mechanism to check if all
required controls are included in one request.

Conform to specifications with removing that mechanism.

Note that this mechanism with static required flag isn't very good
anyway because need for control is usually signaled in other controls.

Fixes: 50e761516f2b ("media: platform: Add Cedrus VPU decoder driver")
Signed-off-by: Jernej Skrabec <jernej....@siol.net>
---
drivers/staging/media/sunxi/cedrus/cedrus.c | 49 ---------------------
drivers/staging/media/sunxi/cedrus/cedrus.h | 1 -
2 files changed, 50 deletions(-)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.c b/drivers/staging/media/sunxi/cedrus/cedrus.c
index ddad5d274ee8..7bd9291c8d5f 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus.c
@@ -34,56 +34,48 @@ static const struct cedrus_control cedrus_controls[] = {
.id = V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS,
},
.codec = CEDRUS_CODEC_MPEG2,
- .required = true,
},
{
.cfg = {
.id = V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION,
},
.codec = CEDRUS_CODEC_MPEG2,
- .required = false,
},
{
.cfg = {
.id = V4L2_CID_STATELESS_H264_DECODE_PARAMS,
},
.codec = CEDRUS_CODEC_H264,
- .required = true,
},
{
.cfg = {
.id = V4L2_CID_STATELESS_H264_SLICE_PARAMS,
},
.codec = CEDRUS_CODEC_H264,
- .required = true,
},
{
.cfg = {
.id = V4L2_CID_STATELESS_H264_SPS,
},
.codec = CEDRUS_CODEC_H264,
- .required = true,
},
{
.cfg = {
.id = V4L2_CID_STATELESS_H264_PPS,
},
.codec = CEDRUS_CODEC_H264,
- .required = true,
},
{
.cfg = {
.id = V4L2_CID_STATELESS_H264_SCALING_MATRIX,
},
.codec = CEDRUS_CODEC_H264,
- .required = false,
},
{
.cfg = {
.id = V4L2_CID_STATELESS_H264_PRED_WEIGHTS,
},
.codec = CEDRUS_CODEC_H264,
- .required = false,
},
{
.cfg = {
@@ -92,7 +84,6 @@ static const struct cedrus_control cedrus_controls[] = {
.def = V4L2_STATELESS_H264_DECODE_MODE_SLICE_BASED,
},
.codec = CEDRUS_CODEC_H264,
- .required = false,
},
{
.cfg = {
@@ -101,7 +92,6 @@ static const struct cedrus_control cedrus_controls[] = {
.def = V4L2_STATELESS_H264_START_CODE_NONE,
},
.codec = CEDRUS_CODEC_H264,
- .required = false,
},
/*
* We only expose supported profiles information,
@@ -120,28 +110,24 @@ static const struct cedrus_control cedrus_controls[] = {
BIT(V4L2_MPEG_VIDEO_H264_PROFILE_EXTENDED),
},
.codec = CEDRUS_CODEC_H264,
- .required = false,
},
{
.cfg = {
.id = V4L2_CID_MPEG_VIDEO_HEVC_SPS,
},
.codec = CEDRUS_CODEC_H265,
- .required = true,
},
{
.cfg = {
.id = V4L2_CID_MPEG_VIDEO_HEVC_PPS,
},
.codec = CEDRUS_CODEC_H265,
- .required = true,
},
{
.cfg = {
.id = V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS,
},
.codec = CEDRUS_CODEC_H265,
- .required = true,
},
{
.cfg = {
@@ -150,7 +136,6 @@ static const struct cedrus_control cedrus_controls[] = {
.def = V4L2_MPEG_VIDEO_HEVC_DECODE_MODE_SLICE_BASED,
},
.codec = CEDRUS_CODEC_H265,
- .required = false,
},
{
.cfg = {
@@ -159,14 +144,12 @@ static const struct cedrus_control cedrus_controls[] = {
.def = V4L2_MPEG_VIDEO_HEVC_START_CODE_NONE,
},
.codec = CEDRUS_CODEC_H265,
- .required = false,
},
{
.cfg = {
.id = V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER,
},
.codec = CEDRUS_CODEC_VP8,
- .required = true,
},
};

@@ -227,12 +210,8 @@ static int cedrus_init_ctrls(struct cedrus_dev *dev, struct cedrus_ctx *ctx)
static int cedrus_request_validate(struct media_request *req)
{
struct media_request_object *obj;
- struct v4l2_ctrl_handler *parent_hdl, *hdl;
struct cedrus_ctx *ctx = NULL;
- struct v4l2_ctrl *ctrl_test;
unsigned int count;
- unsigned int i;
- int ret = 0;

list_for_each_entry(obj, &req->objects, list) {
struct vb2_buffer *vb;
@@ -259,34 +238,6 @@ static int cedrus_request_validate(struct media_request *req)
return -EINVAL;
}

- parent_hdl = &ctx->hdl;
-
- hdl = v4l2_ctrl_request_hdl_find(req, parent_hdl);
- if (!hdl) {
- v4l2_info(&ctx->dev->v4l2_dev, "Missing codec control(s)\n");
- return -ENOENT;
- }
-
- for (i = 0; i < CEDRUS_CONTROLS_COUNT; i++) {
- if (cedrus_controls[i].codec != ctx->current_codec ||
- !cedrus_controls[i].required)
- continue;
-
- ctrl_test = v4l2_ctrl_request_hdl_ctrl_find(hdl,
- cedrus_controls[i].cfg.id);
- if (!ctrl_test) {
- v4l2_info(&ctx->dev->v4l2_dev,
- "Missing required codec control\n");
- ret = -ENOENT;
- break;
- }
- }
-
- v4l2_ctrl_request_hdl_put(hdl);
-
- if (ret)
- return ret;
-
return vb2_request_validate(req);
}

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.h b/drivers/staging/media/sunxi/cedrus/cedrus.h
index c96077aaef49..251a6a660351 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus.h
+++ b/drivers/staging/media/sunxi/cedrus/cedrus.h
@@ -56,7 +56,6 @@ enum cedrus_h264_pic_type {
struct cedrus_control {
struct v4l2_ctrl_config cfg;
enum cedrus_codec codec;
- unsigned char required:1;
};

struct cedrus_h264_run {
--
2.29.2

[Jernej Skrabec]

During H264 API overhaul subtle bug was introduced Cedrus driver.
Progressive references have both, top and bottom reference flags set.
Cedrus reference list expects only bottom reference flag and only when
interlaced frames are decoded. However, due to a bug in Cedrus check,
exclusivity is not tested and that flag is set also for progressive
references. That causes "jumpy" background with many videos.

Fix that by checking that only bottom reference flag is set in control
and nothing else.

Tested-by: Andre Heider <a.he...@gmail.com>
Fixes: cfc8c3ed533e ("media: cedrus: h264: Properly configure reference field")

Signed-off-by: Jernej Skrabec <jernej....@siol.net>
---

drivers/staging/media/sunxi/cedrus/cedrus_h264.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
index 781c84a9b1b7..de7442d4834d 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
@@ -203,7 +203,7 @@ static void _cedrus_write_ref_list(struct cedrus_ctx *ctx,
position = cedrus_buf->codec.h264.position;

sram_array[i] |= position << 1;
- if (ref_list[i].fields & V4L2_H264_BOTTOM_FIELD_REF)
+ if (ref_list[i].fields == V4L2_H264_BOTTOM_FIELD_REF)
sram_array[i] |= BIT(0);
}

--
2.29.2