On Fri, 22 May 2026, Michał Grzelak wrote:
> Setting 6th or 9th bit of drm.debug change debug logging. Meanwhile
> `modinfo drm` does not inform about it at all.
>
> Add info to MODULE_PARAM_DESC(debug, ...) about setting 6th and 9th bit
> basing on DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, ...). Match
> description of corresponding bits with enum drm_debug_category. Include
> 9th bit in the example with enabling all possible logging provided at
> comment at include/drm/drm_print.h.
>
> Signed-off-by: Michał Grzelak <michal.grzelak@intel.com>

What should have been added here is R-B: tag provided by Chaitanya,
which currently is very much absent. The omission was not intentional.

BR,
Michał

> ---
> drivers/gpu/drm/drm_print.c | 4 +++-
> include/drm/drm_print.h     | 2 +-
> 2 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
> index ded9461df5f2..86cef1a37678 100644
> --- a/drivers/gpu/drm/drm_print.c
> +++ b/drivers/gpu/drm/drm_print.c
> @@ -50,8 +50,10 @@ MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug cat
> "\t\tBit 3 (0x08)  will enable PRIME messages (prime code)\n"
> "\t\tBit 4 (0x10)  will enable ATOMIC messages (atomic code)\n"
> "\t\tBit 5 (0x20)  will enable VBL messages (vblank code)\n"
> +"\t\tBit 6 (0x40)  will enable STATE messages (atomic state code)\n"
> "\t\tBit 7 (0x80)  will enable LEASE messages (leasing code)\n"
> -"\t\tBit 8 (0x100) will enable DP messages (displayport code)");
> +"\t\tBit 8 (0x100) will enable DP messages (displayport code)\n"
> +"\t\tBit 9 (0x200) will enable DRMRES messages (managed resources code)");
>
> #if !defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
> module_param_named(debug, __drm_debug, ulong, 0600);
> diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
> index ab017b05e175..2adc5ac688e1 100644
> --- a/include/drm/drm_print.h
> +++ b/include/drm/drm_print.h
> @@ -87,7 +87,7 @@ extern unsigned long __drm_debug;
>  *  - drm.debug=0x2 will enable DRIVER messages
>  *  - drm.debug=0x3 will enable CORE and DRIVER messages
>  *  - ...
> - *  - drm.debug=0x1ff will enable all messages
> + *  - drm.debug=0x3ff will enable all messages
>  *
>  * An interesting feature is that it's possible to enable verbose logging at
>  * run-time by echoing the debug value in its sysfs node::
> -- 
> 2.45.2
>
>