media: aspeed: add debugfs

To show video real-time information as below:

Capture:
Signal : Unlock
Width : 1920
Height : 1080
FRC : 30

Performance:
Frame# : 0
Frame Duration(ms) :
Now : 0
Min : 0
Max : 0
FPS : 0

[hverkuil: make aspeed_video_proc_open() static, fixes sparse warning]

Signed-off-by: Jammy Huang <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/platform/aspeed-video.c

···
 #include <linux/videodev2.h>
 #include <linux/wait.h>
 #include <linux/workqueue.h>
+#include <linux/debugfs.h>
+#include <linux/ktime.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-dev.h>
 #include <media/v4l2-device.h>
···
 	struct list_head link;
 };
 
+struct aspeed_video_perf {
+	ktime_t last_sample;
+	u32 totaltime;
+	u32 duration;
+	u32 duration_min;
+	u32 duration_max;
+};
+
 #define to_aspeed_video_buffer(x) \
 	container_of((x), struct aspeed_video_buffer, vb)
 
···
 	unsigned int frame_left;
 	unsigned int frame_right;
 	unsigned int frame_top;
+
+	struct aspeed_video_perf perf;
 };
 
 #define to_aspeed_video(x) container_of((x), struct aspeed_video, v4l2_dev)
···
 		readl(video->base + reg));
 }
 
+static void update_perf(struct aspeed_video_perf *p)
+{
+	p->duration =
+		ktime_to_ms(ktime_sub(ktime_get(),  p->last_sample));
+	p->totaltime += p->duration;
+
+	p->duration_max = max(p->duration, p->duration_max);
+	p->duration_min = min(p->duration, p->duration_min);
+}
+
 static int aspeed_video_start_frame(struct aspeed_video *video)
 {
 	dma_addr_t addr;
···
 
 	aspeed_video_update(video, VE_INTERRUPT_CTRL, 0,
 			    VE_INTERRUPT_COMP_COMPLETE);
+
+	video->perf.last_sample = ktime_get();
 
 	aspeed_video_update(video, VE_SEQ_CTRL, 0,
 			    VE_SEQ_CTRL_TRIG_CAPTURE | VE_SEQ_CTRL_TRIG_COMP);
···
 		struct aspeed_video_buffer *buf;
 		u32 frame_size = aspeed_video_read(video,
 						   video->comp_size_read);
+
+		update_perf(&video->perf);
 
 		spin_lock(&video->lock);
 		clear_bit(VIDEO_FRAME_INPRG, &video->flags);
···
 	det->width = MIN_WIDTH;
 	det->height = MIN_HEIGHT;
 	video->v4l2_input_status = V4L2_IN_ST_NO_SIGNAL;
+	memset(&video->perf, 0, sizeof(video->perf));
 
 	do {
 		if (tries) {
···
 	struct aspeed_video *video = vb2_get_drv_priv(q);
 
 	video->sequence = 0;
+	video->perf.duration_max = 0;
+	video->perf.duration_min = 0xffffffff;
 
 	rc = aspeed_video_start_frame(video);
 	if (rc) {
···
 	.stop_streaming = aspeed_video_stop_streaming,
 	.buf_queue =  aspeed_video_buf_queue,
 };
+
+#ifdef CONFIG_DEBUG_FS
+static int aspeed_video_debugfs_show(struct seq_file *s, void *data)
+{
+	struct aspeed_video *v = s->private;
+
+	seq_puts(s, "\n");
+
+	seq_printf(s, "  %-20s:\t%s\n", "Signal",
+		   v->v4l2_input_status ? "Unlock" : "Lock");
+	seq_printf(s, "  %-20s:\t%d\n", "Width", v->pix_fmt.width);
+	seq_printf(s, "  %-20s:\t%d\n", "Height", v->pix_fmt.height);
+	seq_printf(s, "  %-20s:\t%d\n", "FRC", v->frame_rate);
+
+	seq_puts(s, "\n");
+
+	seq_puts(s, "Performance:\n");
+	seq_printf(s, "  %-20s:\t%d\n", "Frame#", v->sequence);
+	seq_printf(s, "  %-20s:\n", "Frame Duration(ms)");
+	seq_printf(s, "    %-18s:\t%d\n", "Now", v->perf.duration);
+	seq_printf(s, "    %-18s:\t%d\n", "Min", v->perf.duration_min);
+	seq_printf(s, "    %-18s:\t%d\n", "Max", v->perf.duration_max);
+	seq_printf(s, "  %-20s:\t%d\n", "FPS", 1000 / (v->perf.totaltime / v->sequence));
+
+	return 0;
+}
+
+static int aspeed_video_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, aspeed_video_debugfs_show, inode->i_private);
+}
+
+static const struct file_operations aspeed_video_debugfs_ops = {
+	.owner   = THIS_MODULE,
+	.open    = aspeed_video_proc_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = single_release,
+};
+
+static struct dentry *debugfs_entry;
+
+static void aspeed_video_debugfs_remove(struct aspeed_video *video)
+{
+	debugfs_remove_recursive(debugfs_entry);
+	debugfs_entry = NULL;
+}
+
+static int aspeed_video_debugfs_create(struct aspeed_video *video)
+{
+	debugfs_entry = debugfs_create_file(DEVICE_NAME, 0444, NULL,
+					    video,
+					    &aspeed_video_debugfs_ops);
+	if (!debugfs_entry)
+		aspeed_video_debugfs_remove(video);
+
+	return !debugfs_entry ? -EIO : 0;
+}
+#else
+static void aspeed_video_debugfs_remove(struct aspeed_video *video) { }
+static int aspeed_video_debugfs_create(struct aspeed_video *video)
+{
+	return 0;
+}
+#endif /* CONFIG_DEBUG_FS */
 
 static int aspeed_video_setup_video(struct aspeed_video *video)
 {
···
 		return rc;
 	}
 
+	rc = aspeed_video_debugfs_create(video);
+	if (rc)
+		dev_err(video->dev, "debugfs create failed\n");
+
 	return 0;
 }
 
···
 	struct aspeed_video *video = to_aspeed_video(v4l2_dev);
 
 	aspeed_video_off(video);
+
+	aspeed_video_debugfs_remove(video);
 
 	clk_unprepare(video->vclk);
 	clk_unprepare(video->eclk);