[PATCH] media: mediatek: vcodec: Skip SOURCE_CHANGE & EOS events for stateless

[Chen-Yu Tsai]

The stateless decoder API does not specify the usage of SOURCE_CHANGE
and EOF events. These events are used by stateful decoders to signal
changes in the bitstream. They do not make sense for stateless decoders.

Do not handle subscription for these two types of events for stateless
decoder instances. This fixes the last v4l2-compliance error:

Control ioctls:
		fail: v4l2-test-controls.cpp(946): have_source_change || have_eos
	test VIDIOC_(UN)SUBSCRIBE_EVENT/DQEVENT: FAIL

Fixes: 8cdc3794b2e3 ("media: mtk-vcodec: vdec: support stateless API")
Signed-off-by: Chen-Yu Tsai <wenst at chromium.org>
---

This should apply cleanly on next-20220617. The other media patches I
have on my branch:

media: mediatek: vcodec: Initialize decoder parameters after getting dec_capability
media: mediatek: vcodec: Fix non subdev architecture open power fail

should not interfere, though the second is required for proper operation
of the decoder on MT8183.

 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
index 62f29b6fa104..a5fbc0a1c6bc 100644
--- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
+++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
@@ -234,6 +234,11 @@ static int vidioc_vdec_querycap(struct file *file, void *priv,
 static int vidioc_vdec_subscribe_evt(struct v4l2_fh *fh,
 				     const struct v4l2_event_subscription *sub)
 {
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(fh);
+
+	if (ctx->dev->vdec_pdata->uses_stateless_api)
+		return v4l2_ctrl_subscribe_event(fh, sub);
+
 	switch (sub->type) {
 	case V4L2_EVENT_EOS:
 		return v4l2_event_subscribe(fh, sub, 2, NULL);
-- 
2.36.1.476.g0c4daa206d-goog