[PATCH v6,4/8] media: mediatek: vcodec: Get each context resolution information

[Yunfei Dong <yunfei.dong@xxxxxxxxxxxx>]

Will store the string to temp buffer like "echo -picinfo > vdec" when
user want to get needed information.

Then getting debug information using command 'cat vdec' calling mtk_vdec_dbgfs_read
to analysis the temp buffer.

Signed-off-by: Yunfei Dong <yunfei.dong@xxxxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
---
 .../mediatek/vcodec/mtk_vcodec_dbgfs.c        | 42 +++++++++++++++++++
 .../mediatek/vcodec/mtk_vcodec_dbgfs.h        |  8 ++++
 2 files changed, 50 insertions(+)

diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c
index 70286088cce8..5b6bd4c4de3b 100644
--- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c
+++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c
@@ -26,9 +26,51 @@ static ssize_t mtk_vdec_dbgfs_write(struct file *filp, const char __user *ubuf,
 	return dbgfs->buf_size;
 }
 
+static ssize_t mtk_vdec_dbgfs_read(struct file *filp, char __user *ubuf,
+				   size_t count, loff_t *ppos)
+{
+	struct mtk_vcodec_dev *vcodec_dev = filp->private_data;
+	struct mtk_vcodec_dbgfs *dbgfs = &vcodec_dev->dbgfs;
+	struct mtk_vcodec_dbgfs_inst *dbgfs_inst;
+	struct mtk_vcodec_ctx *ctx;
+	int total_len = 200 * (dbgfs->inst_count == 0 ? 1 : dbgfs->inst_count);
+	int used_len = 0, curr_len, ret;
+	bool dbgfs_index[MTK_VDEC_DBGFS_MAX] = {0};
+	char *buf = kmalloc(total_len, GFP_KERNEL);
+
+	if (!buf)
+		return -ENOMEM;
+
+	if (strstr(dbgfs->dbgfs_buf, "-picinfo"))
+		dbgfs_index[MTK_VDEC_DBGFS_PICINFO] = true;
+
+	mutex_lock(&dbgfs->dbgfs_lock);
+	list_for_each_entry(dbgfs_inst, &dbgfs->dbgfs_head, node) {
+		ctx = dbgfs_inst->vcodec_ctx;
+
+		curr_len = snprintf(buf + used_len, total_len - used_len,
+				    "inst[%d]:\n ", ctx->id);
+		used_len += curr_len;
+
+		if (dbgfs_index[MTK_VDEC_DBGFS_PICINFO]) {
+			curr_len = snprintf(buf + used_len, total_len - used_len,
+					    "\treal(%dx%d)=>align(%dx%d)\n",
+					    ctx->picinfo.pic_w, ctx->picinfo.pic_h,
+					    ctx->picinfo.buf_w, ctx->picinfo.buf_h);
+			used_len += curr_len;
+		}
+	}
+	mutex_unlock(&dbgfs->dbgfs_lock);
+
+	ret = simple_read_from_buffer(ubuf, count, ppos, buf, used_len);
+	kfree(buf);
+	return ret;
+}
+
 static const struct file_operations vdec_fops = {
 	.open = simple_open,
 	.write = mtk_vdec_dbgfs_write,
+	.read = mtk_vdec_dbgfs_read,
 };
 
 void mtk_vcodec_dbgfs_create(struct mtk_vcodec_ctx *ctx)
diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.h b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.h
index a563e656f42e..30d956b7227f 100644
--- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.h
+++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.h
@@ -10,6 +10,14 @@
 struct mtk_vcodec_dev;
 struct mtk_vcodec_ctx;
 
+/*
+ * enum mtk_vdec_dbgfs_log_index  - used to get different debug information
+ */
+enum mtk_vdec_dbgfs_log_index {
+	MTK_VDEC_DBGFS_PICINFO,
+	MTK_VDEC_DBGFS_MAX,
+};
+
 /**
  * struct mtk_vcodec_dbgfs_inst  - debugfs information for each inst
  * @node:       list node for each inst
-- 
2.18.0