linux-kernel - Re: [PATCH v2] media: mediatek: vcodec: add decoder command to support stateless decoder

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Message-ID: <20240513100641.5irday5ej2v66jur@basti-XPS-13-9310>
Date: Mon, 13 May 2024 12:06:41 +0200
From: Sebastian Fricke <sebastian.fricke@...labora.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Yunfei Dong <yunfei.dong@...iatek.com>,
	Nícolas F . R . A . Prado <nfraprado@...labora.com>,
	Nicolas Dufresne <nicolas.dufresne@...labora.com>,
	Hans Verkuil <hverkuil-cisco@...all.nl>,
	Benjamin Gaignard <benjamin.gaignard@...labora.com>,
	Nathan Hebert <nhebert@...omium.org>,
	Hsin-Yi Wang <hsinyi@...omium.org>,
	Fritz Koenig <frkoenig@...omium.org>,
	Daniel Vetter <daniel@...ll.ch>, Steve Cho <stevecho@...omium.org>,
	linux-media@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v2] media: mediatek: vcodec: add decoder command to
 support stateless decoder

Hey Angelo,

On 09.05.2024 11:54, AngeloGioacchino Del Regno wrote:
>Il 16/03/24 09:13, Yunfei Dong ha scritto:
>>The supported decoder commands are different for stateless and
>>stateful architecture. 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@...iatek.com>
>
>Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>
>Nicolas, Sebastian, anything to add?

No looks fine for me, this is on my list for the next round of pull
requests.

>
>Cheers,
>Angelo

Greetings,
Sebastian

>
>>---
>>changed with v1:
>>- remove the static function prefix.
>>- fix some messages not reasonable.
>>---
>>  .../mediatek/vcodec/decoder/mtk_vcodec_dec.c  | 60 +++++++++++++++++--
>>  1 file changed, 54 insertions(+), 6 deletions(-)
>>
>>diff --git a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec.c b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec.c
>>index ba742f0e391d..c2b64a528028 100644
>>--- a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec.c
>>+++ b/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]);
>
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