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How do I turn on V4L debug messages?

John Anderson
Genius 5240 points

The chip drivers use debug messages through V4L but I can't figure out how to turn them on.  I've had to go around them to get debug messages from the driver, but my curiosity tells me to find the answer to this question.

JohnA

  • 0
    Guru 11260 points

    Hi John,

    looking at the v4l_dbg code

    #define v4l_dbg(level, debug, client, fmt, arg...)                 \
        do {                                      \
            if (debug >= (level))                         \
                v4l_client_printk(KERN_DEBUG, client, fmt , ## arg); \
        } while (0)

    so when you call this macro its obvious that debug's value must be greater or equal to level.

    This debug value might be set as the module parameter for the driver, you just look at it.

    Thx,

    --Prabhakar