From 2ea8b58dd3e1a82c4e70c26eb9a9c709b2b4790f Mon Sep 17 00:00:00 2001
From: Shridhar Rasal <srasal@nvidia.com>
Date: Wed, 24 Jan 2018 15:24:18 +0530
Subject: [PATCH] drivers: video: tegra: host: decode fw version tag

- Decode firmware version tag from ucode binary.
- Add debugfs to dump firmware version tag

Jira DLA-318

Change-Id: I0208d8c8da2d91454f3ba0f4efa618cb44e22787
Signed-off-by: Shridhar Rasal <srasal@nvidia.com>
Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1645226
GVS: Gerrit_Virtual_Submit
Reviewed-by: Mitch Harwell <mharwell@nvidia.com>
Tested-by: Mitch Harwell <mharwell@nvidia.com>
Reviewed-by: Ken Adams <kadams@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
---
 drivers/video/tegra/host/nvdla/nvdla_debug.c | 41 ++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/drivers/video/tegra/host/nvdla/nvdla_debug.c b/drivers/video/tegra/host/nvdla/nvdla_debug.c
index bc1fcb12..ddc31a97 100644
--- a/drivers/video/tegra/host/nvdla/nvdla_debug.c
+++ b/drivers/video/tegra/host/nvdla/nvdla_debug.c
@@ -524,6 +524,43 @@ static ssize_t debug_dla_fw_reload_set(struct file *file,
 	return count;
 }
 
+static int nvdla_fw_ver_tag_show(struct seq_file *s, void *unused)
+{
+	struct nvdla_device *nvdla_dev;
+	struct platform_device *pdev;
+	int err;
+	unsigned int tag;
+	struct flcn *m;
+
+	nvdla_dev = (struct nvdla_device *)s->private;
+	pdev = nvdla_dev->pdev;
+
+	/* update fw_version if engine is not yet powered on */
+	err = nvhost_module_busy(pdev);
+	if (err)
+		return err;
+
+	m = get_flcn(pdev);
+	tag = m->os.bin_ver_tag;
+
+	nvhost_module_idle(pdev);
+
+	seq_printf(s, "%x\n", tag);
+
+	return 0;
+}
+
+static int nvdla_fw_ver_tag_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, nvdla_fw_ver_tag_show, inode->i_private);
+}
+
+static const struct file_operations nvdla_fw_ver_tag_fops = {
+	.open		= nvdla_fw_ver_tag_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
 static int debug_dla_fw_reload_show(struct seq_file *s, void *data)
 {
 	seq_puts(s, "0\n");
@@ -613,6 +650,10 @@ static void dla_fw_debugfs_init(struct platform_device *pdev)
 			nvdla_dev, &nvdla_fw_ver_fops))
 		goto trace_failed;
 
+	if (!debugfs_create_file("tag", S_IRUGO, fw_dir,
+			nvdla_dev, &nvdla_fw_ver_tag_fops))
+		goto trace_failed;
+
 	if (!debugfs_create_file("reload", 0600, fw_dir,
 			nvdla_dev, &nvdla_fw_reload_fops))
 		goto trace_failed;