[PATCH 3/3] media: mtk-jpegenc: design SW algorithm for using multi-HW of jpegenc

[kyrie.wu <kyrie.wu@mediatek.com>]

the SW algorithm would meet the request of how to use
multi-HW at the same time;
For user process, it only needed to open one device node to use
multi-HW.

Signed-off-by: kyrie.wu <kyrie.wu@mediatek.com>
---
 drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c | 164 +++++++++++++++++++++---
 1 file changed, 147 insertions(+), 17 deletions(-)

diff --git a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
index c84815a..b8d1303 100644
--- a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
+++ b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
@@ -944,38 +944,150 @@ static int mtk_jpeg_set_dec_dst(struct mtk_jpeg_ctx *ctx,
 	return 0;
 }
 
-static void mtk_jpeg_enc_device_run(void *priv)
+static int mtk_jpeg_select_hw(struct mtk_jpeg_ctx *ctx)
 {
-	struct mtk_jpeg_ctx *ctx = priv;
+	int hw_id = -1;
+	int i;
+	unsigned long flags;
+	struct mtk_jpeg_dev *jpeg = ctx->jpeg, *comp_jpeg = NULL;
+
+	spin_lock_irqsave(&jpeg->hw_lock, flags);
+	for (i = 0; i < MTK_JPEGENC_HW_MAX; i++) {
+		comp_jpeg = jpeg->hw_dev[i];
+		if (comp_jpeg->hw_state == MTK_JPEG_HW_IDLE) {
+			hw_id = i;
+			comp_jpeg->hw_state = MTK_JPEG_HW_BUSY;
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&jpeg->hw_lock, flags);
+
+	return hw_id;
+}
+
+static int mtk_jpeg_deselect_hw(struct mtk_jpeg_dev *jpeg, int hw_id)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&jpeg->hw_lock, flags);
+	jpeg->hw_dev[hw_id]->hw_state = MTK_JPEG_HW_IDLE;
+	spin_unlock_irqrestore(&jpeg->hw_lock, flags);
+
+	return 0;
+}
+
+static int mtk_jpeg_set_hw_param(struct mtk_jpeg_ctx *ctx,
+				 int hw_id,
+				 struct vb2_v4l2_buffer *src_buf,
+				 struct vb2_v4l2_buffer *dst_buf)
+{
+	struct mtk_jpeg_dev *jpeg = ctx->jpeg->hw_dev[hw_id];
+
+	jpeg->hw_param.curr_ctx = ctx;
+	jpeg->hw_param.src_buffer = src_buf;
+	jpeg->hw_param.dst_buffer = dst_buf;
+
+	return 0;
+}
+
+static void mtk_jpegenc_worker(struct work_struct *work)
+{
+	struct mtk_jpeg_ctx *ctx = container_of(work, struct mtk_jpeg_ctx,
+		jpeg_work);
 	struct mtk_jpeg_dev *jpeg = ctx->jpeg;
+	struct mtk_jpeg_dev *comp_jpeg[MTK_JPEGENC_HW_MAX];
 	struct vb2_v4l2_buffer *src_buf, *dst_buf;
 	enum vb2_buffer_state buf_state = VB2_BUF_STATE_ERROR;
 	unsigned long flags;
-	int ret;
+	struct mtk_jpeg_src_buf *jpeg_src_buf, *jpeg_dst_buf;
+	int ret, i, hw_id = 0;
+	atomic_t *hw_rdy[MTK_JPEGENC_HW_MAX];
+	struct clk *jpegenc_clk;
+
+	for (i = 0; i < MTK_JPEGENC_HW_MAX; i++) {
+		comp_jpeg[i] = jpeg->hw_dev[i];
+		hw_rdy[i] = &comp_jpeg[i]->hw_rdy;
+	}
+
+retry_select:
+	hw_id = mtk_jpeg_select_hw(ctx);
+	if (hw_id < 0) {
+		//wait hw idle
+		ret = wait_event_interruptible(jpeg->hw_wq,
+					       (atomic_read(hw_rdy[0]) ||
+					       atomic_read(hw_rdy[1])) > 0);
+		if (ret != 0) {
+			pr_err("%s : %d, all HW are busy\n",
+			       __func__, __LINE__);
+			v4l2_m2m_job_finish(jpeg->m2m_dev, ctx->fh.m2m_ctx);
+			return;
+		}
+		pr_info("%s : %d, NEW HW IDLE, please retry selcet!!!\n",
+			__func__, __LINE__);
+		goto retry_select;
+	}
+	atomic_dec(&comp_jpeg[hw_id]->hw_rdy);
 
 	src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
+	if (!src_buf) {
+		pr_info("%s : %d, get src_buf fail !!!\n", __func__, __LINE__);
+		goto getbuf_fail;
+	}
+
 	dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
+	if (!dst_buf) {
+		pr_info("%s : %d, get dst_buf fail !!!\n", __func__, __LINE__);
+		goto getbuf_fail;
+	}
 
-	ret = pm_runtime_get_sync(jpeg->dev);
-	if (ret < 0)
+	jpeg_src_buf = mtk_jpeg_vb2_to_srcbuf(&src_buf->vb2_buf);
+	jpeg_dst_buf = mtk_jpeg_vb2_to_srcbuf(&dst_buf->vb2_buf);
+
+	jpeg_src_buf->curr_ctx = ctx;
+	jpeg_src_buf->frame_num = ctx->total_frame_num;
+	jpeg_dst_buf->curr_ctx = ctx;
+	jpeg_dst_buf->frame_num = ctx->total_frame_num;
+	ctx->total_frame_num++;
+
+	v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
+	v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
+
+	mtk_jpeg_set_hw_param(ctx, hw_id, src_buf, dst_buf);
+
+	ret = pm_runtime_get_sync(comp_jpeg[hw_id]->pm.dev);
+	if (ret < 0) {
+		pr_err("%s : %d, pm_runtime_get_sync fail !!!\n",
+		       __func__, __LINE__);
 		goto enc_end;
+	}
 
-	schedule_delayed_work(&jpeg->job_timeout_work,
-			      msecs_to_jiffies(MTK_JPEG_HW_TIMEOUT_MSEC));
+	jpegenc_clk = comp_jpeg[hw_id]->pm.venc_clk.clk_info->jpegenc_clk;
+	ret = clk_prepare_enable(jpegenc_clk);
+	if (ret) {
+		pr_err("%s : %d, jpegenc clk_prepare_enable fail\n",
+		       __func__, __LINE__);
+		goto enc_end;
+	}
 
-	spin_lock_irqsave(&jpeg->hw_lock, flags);
+	schedule_delayed_work(&comp_jpeg[hw_id]->job_timeout_work,
+			      msecs_to_jiffies(MTK_JPEG_HW_TIMEOUT_MSEC));
 
 	/*
 	 * Resetting the hardware every frame is to ensure that all the
 	 * registers are cleared. This is a hardware requirement.
 	 */
-	mtk_jpeg_enc_reset(jpeg->reg_base);
-
-	mtk_jpeg_set_enc_src(ctx, jpeg->reg_base, &src_buf->vb2_buf);
-	mtk_jpeg_set_enc_dst(ctx, jpeg->reg_base, &dst_buf->vb2_buf);
-	mtk_jpeg_set_enc_params(ctx, jpeg->reg_base);
-	mtk_jpeg_enc_start(jpeg->reg_base);
-	spin_unlock_irqrestore(&jpeg->hw_lock, flags);
+	spin_lock_irqsave(&comp_jpeg[hw_id]->hw_lock, flags);
+	mtk_jpeg_enc_reset(comp_jpeg[hw_id]->reg_base[0]);
+	mtk_jpeg_set_enc_dst(ctx,
+			     comp_jpeg[hw_id]->reg_base[0],
+			     &dst_buf->vb2_buf);
+	mtk_jpeg_set_enc_src(ctx,
+			     comp_jpeg[hw_id]->reg_base[0],
+			     &src_buf->vb2_buf);
+	mtk_jpeg_set_enc_params(ctx, comp_jpeg[hw_id]->reg_base[0]);
+	mtk_jpeg_enc_start(comp_jpeg[hw_id]->reg_base[0]);
+	v4l2_m2m_job_finish(jpeg->m2m_dev, ctx->fh.m2m_ctx);
+	spin_unlock_irqrestore(&comp_jpeg[hw_id]->hw_lock, flags);
 	return;
 
 enc_end:
@@ -983,9 +1095,20 @@ static void mtk_jpeg_enc_device_run(void *priv)
 	v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
 	v4l2_m2m_buf_done(src_buf, buf_state);
 	v4l2_m2m_buf_done(dst_buf, buf_state);
+getbuf_fail:
+	atomic_inc(&comp_jpeg[hw_id]->hw_rdy);
+	mtk_jpeg_deselect_hw(jpeg, hw_id);
 	v4l2_m2m_job_finish(jpeg->m2m_dev, ctx->fh.m2m_ctx);
 }
 
+static void mtk_jpeg_enc_device_run(void *priv)
+{
+	struct mtk_jpeg_ctx *ctx = priv;
+	struct mtk_jpeg_dev *jpeg = ctx->jpeg;
+
+	queue_work(jpeg->workqueue, &ctx->jpeg_work);
+}
+
 static void mtk_jpeg_dec_device_run(void *priv)
 {
 	struct mtk_jpeg_ctx *ctx = priv;
@@ -1002,7 +1125,8 @@ static void mtk_jpeg_dec_device_run(void *priv)
 	dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
 	jpeg_src_buf = mtk_jpeg_vb2_to_srcbuf(&src_buf->vb2_buf);
 
-	if (mtk_jpeg_check_resolution_change(ctx, &jpeg_src_buf->dec_param)) {
+	if (mtk_jpeg_check_resolution_change(ctx,
+					     &jpeg_src_buf->dec_param)) {
 		mtk_jpeg_queue_src_chg_event(ctx);
 		ctx->state = MTK_JPEG_SOURCE_CHANGE;
 		v4l2_m2m_job_finish(jpeg->m2m_dev, ctx->fh.m2m_ctx);
@@ -1017,7 +1141,8 @@ static void mtk_jpeg_dec_device_run(void *priv)
 			      msecs_to_jiffies(MTK_JPEG_HW_TIMEOUT_MSEC));
 
 	mtk_jpeg_set_dec_src(ctx, &src_buf->vb2_buf, &bs);
-	if (mtk_jpeg_set_dec_dst(ctx, &jpeg_src_buf->dec_param, &dst_buf->vb2_buf, &fb))
+	if (mtk_jpeg_set_dec_dst(ctx, &jpeg_src_buf->dec_param,
+				 &dst_buf->vb2_buf, &fb))
 		goto dec_end;
 
 	spin_lock_irqsave(&jpeg->hw_lock, flags);
@@ -1248,6 +1373,11 @@ static int mtk_jpeg_open(struct file *file)
 		goto free;
 	}
 
+	if (jpeg->variant->is_encoder) {
+		INIT_WORK(&ctx->jpeg_work, mtk_jpegenc_worker);
+		INIT_LIST_HEAD(&ctx->dst_done_queue);
+	}
+
 	v4l2_fh_init(&ctx->fh, vfd);
 	file->private_data = &ctx->fh;
 	v4l2_fh_add(&ctx->fh);
-- 
2.6.4
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