media: mediatek: vcodec: add decoder command to support stateless decoder

The supported decoder commands are different for stateless and
stateful architectures. Add stateless decoder commands to fix
the v4l2-compliance test error below.

Codec ioctls:
    VIDIOC_ENCODER_CMD returned -1 (Inappropriate ioctl for device)
    VIDIOC_TRY_ENCODER_CMD returned -1 (Inappropriate ioctl for device)
 test VIDIOC_(TRY_)ENCODER_CMD: OK (Not Supported)
    VIDIOC_G_ENC_INDEX returned -1 (Inappropriate ioctl for device)
 test VIDIOC_G_ENC_INDEX: OK (Not Supported)
    VIDIOC_DECODER_CMD returned -1 (Invalid argument)
    VIDIOC_TRY_DECODER_CMD returned -1 (Invalid argument)
    VIDIOC_TRY_DECODER_CMD returned -1 (Invalid argument)
    fail: v4l2-test-codecs.cpp(126): ret
 test VIDIOC_(TRY_)DECODER_CMD: FAIL
Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec.c

@@ -80,21 +80,18 @@ static struct mtk_q_data *mtk_vdec_get_q_data(struct mtk_vcodec_dec_ctx *ctx,
 	return &ctx->q_data[MTK_Q_DATA_DST];
 }
 
-static int vidioc_try_decoder_cmd(struct file *file, void *priv,
-				struct v4l2_decoder_cmd *cmd)
+static int stateful_try_decoder_cmd(struct file *file, void *priv, struct v4l2_decoder_cmd *cmd)
 {
 	return v4l2_m2m_ioctl_try_decoder_cmd(file, priv, cmd);
 }
 
-
-static int vidioc_decoder_cmd(struct file *file, void *priv,
-				struct v4l2_decoder_cmd *cmd)
+static int stateful_decoder_cmd(struct file *file, void *priv, struct v4l2_decoder_cmd *cmd)
 {
 	struct mtk_vcodec_dec_ctx *ctx = fh_to_dec_ctx(priv);
 	struct vb2_queue *src_vq, *dst_vq;
 	int ret;
 
-	ret = vidioc_try_decoder_cmd(file, priv, cmd);
+	ret = stateful_try_decoder_cmd(file, priv, cmd);
 	if (ret)
 		return ret;
 
@@ -128,6 +125,57 @@ static int vidioc_decoder_cmd(struct file *file, void *priv,
 	return 0;
 }
 
+static int stateless_try_decoder_cmd(struct file *file, void *priv, struct v4l2_decoder_cmd *cmd)
+{
+	return v4l2_m2m_ioctl_stateless_try_decoder_cmd(file, priv, cmd);
+}
+
+static int stateless_decoder_cmd(struct file *file, void *priv, struct v4l2_decoder_cmd *cmd)
+{
+	struct mtk_vcodec_dec_ctx *ctx = fh_to_dec_ctx(priv);
+	int ret;
+
+	ret = v4l2_m2m_ioctl_stateless_try_decoder_cmd(file, priv, cmd);
+	if (ret)
+		return ret;
+
+	mtk_v4l2_vdec_dbg(3, ctx, "decoder cmd=%u", cmd->cmd);
+	switch (cmd->cmd) {
+	case V4L2_DEC_CMD_FLUSH:
+		/*
+		 * If the flag of the output buffer is equals V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF,
+		 * this command will prevent dequeueing the capture buffer containing the last
+		 * decoded frame. Or do nothing
+		 */
+		break;
+	default:
+		mtk_v4l2_vdec_err(ctx, "invalid stateless decoder cmd=%u", cmd->cmd);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int vidioc_try_decoder_cmd(struct file *file, void *priv, struct v4l2_decoder_cmd *cmd)
+{
+	struct mtk_vcodec_dec_ctx *ctx = fh_to_dec_ctx(priv);
+
+	if (ctx->dev->vdec_pdata->uses_stateless_api)
+		return stateless_try_decoder_cmd(file, priv, cmd);
+
+	return stateful_try_decoder_cmd(file, priv, cmd);
+}
+
+static int vidioc_decoder_cmd(struct file *file, void *priv, struct v4l2_decoder_cmd *cmd)
+{
+	struct mtk_vcodec_dec_ctx *ctx = fh_to_dec_ctx(priv);
+
+	if (ctx->dev->vdec_pdata->uses_stateless_api)
+		return stateless_decoder_cmd(file, priv, cmd);
+
+	return stateful_decoder_cmd(file, priv, cmd);
+}
+
 void mtk_vdec_unlock(struct mtk_vcodec_dec_ctx *ctx)
 {
 	mutex_unlock(&ctx->dev->dec_mutex[ctx->hw_id]);