How to enable debug statements in v4l2 framework

[m silverstri <michael.j.silverstri@xxxxxxxxx>]

Hi,

In drivers/media/v4l2-core/videobuf2-core.c, I see debug printfs ilke this.
I want to know how can I enable debug statements in v42l framework?

 #define dprintk(level, fmt, arg...)                                    \
        do {                                                            \
               if (debug >= level)                                     \
                       printk(KERN_DEBUG "vb2: " fmt, ## arg);         \
        } while (0)

Thank you.
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