[PATCH v2 3/6] drm: lcdif: rework runtime PM handling in the atomic commit

[kernel test robot]

Hi Lucas,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on linus/master v6.6-rc2 next-20230921]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Lucas-Stach/drm-lcdif-don-t-clear-unrelated-bits-in-CTRLDESCL0_5-when-setting-up-format/20230922-040438
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20230921200312.3989073-3-l.stach%40pengutronix.de
patch subject: [PATCH v2 3/6] drm: lcdif: rework runtime PM handling in the atomic commit
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20230922/202309220530.84SlbdTU-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230922/202309220530.84SlbdTU-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309220530.84SlbdTU-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/mxsfb/lcdif_drv.c:39:6: warning: no previous prototype for 'lcdif_commit_tail' [-Wmissing-prototypes]
      39 | void lcdif_commit_tail(struct drm_atomic_state *old_state)
         |      ^~~~~~~~~~~~~~~~~


vim +/lcdif_commit_tail +39 drivers/gpu/drm/mxsfb/lcdif_drv.c

    38	
  > 39	void lcdif_commit_tail(struct drm_atomic_state *old_state)
    40	{
    41		struct drm_device *drm = old_state->dev;
    42	
    43		pm_runtime_get_sync(drm->dev);
    44	
    45		drm_atomic_helper_commit_modeset_disables(drm, old_state);
    46		drm_atomic_helper_commit_planes(drm, old_state,
    47						DRM_PLANE_COMMIT_ACTIVE_ONLY);
    48		drm_atomic_helper_commit_modeset_enables(drm, old_state);
    49	
    50		drm_atomic_helper_fake_vblank(old_state);
    51		drm_atomic_helper_commit_hw_done(old_state);
    52		drm_atomic_helper_wait_for_vblanks(drm, old_state);
    53	
    54		pm_runtime_put(drm->dev);
    55	
    56		drm_atomic_helper_cleanup_planes(drm, old_state);
    57	}
    58	

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