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| /openbmc/linux/include/drm/ |
| H A D | drm_print.h | 30658985 Tue Sep 21 10:28:01 CDT 2021 Douglas Anderson <dianders@chromium.org> drm/print: Add deprecation notes to DRM_...() functions
It's hard for someone (like me) who's not following closely to know
what the suggested best practices are for error printing in DRM
drivers. Add some hints to the header file.
In general, my understanding is that:
* When possible we should be using a `struct drm_device` for logging
and recent patches have tried to make it more possible to access a
relevant `struct drm_device` in more places.
* For most cases when we don't have a `struct drm_device`, we no
longer bother with DRM-specific wrappers on the dev_...() functions
or pr_...() functions and just encourage drivers to use the normal
functions.
* For debug-level functions where we might want filtering based on a
category we'll still have DRM-specific wrappers, but we'll only
support passing a `struct drm_device`, not a `struct
device`. Presumably most of the cases where we want the filtering
are messages that happen while the system is in a normal running
state (AKA not during probe time) and we should have a `struct
drm_device` then. If we absolutely can't get a `struct drm_device`
then these functions begrudgingly accept NULL for the `struct
drm_device` and hopefully the awkwardness of having to manually pass
NULL will keep people from doing this unless absolutely necessary.
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210921082757.RFC.1.Ibd82d98145615fa55f604947dc6a696cc82e8e43@changeid
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