[PATCH V3 4/9] drm/vc4: hdmi: add PM suspend/resume support

[kernel test robot]

Hi Stefan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on arm/for-next arm/fixes v6.11-rc4 next-20240822]
[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/Stefan-Wahren/mailbox-bcm2835-Fix-timeout-during-suspend-mode/20240822-063725
base:   linus/master
patch link:    https://lore.kernel.org/r/20240821214052.6800-5-wahrenst%40gmx.net
patch subject: [PATCH V3 4/9] drm/vc4: hdmi: add PM suspend/resume support
config: arc-allmodconfig (https://download.01.org/0day-ci/archive/20240822/202408221940.t4pWjzvz-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240822/202408221940.t4pWjzvz-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/202408221940.t4pWjzvz-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/vc4/vc4_hdmi.c:3118:12: warning: 'vc4_hdmi_resume' defined but not used [-Wunused-function]
    3118 | static int vc4_hdmi_resume(struct device *dev)
         |            ^~~~~~~~~~~~~~~
>> drivers/gpu/drm/vc4/vc4_hdmi.c:3107:12: warning: 'vc4_hdmi_suspend' defined but not used [-Wunused-function]
    3107 | static int vc4_hdmi_suspend(struct device *dev)
         |            ^~~~~~~~~~~~~~~~


vim +/vc4_hdmi_resume +3118 drivers/gpu/drm/vc4/vc4_hdmi.c

  3106	
> 3107	static int vc4_hdmi_suspend(struct device *dev)
  3108	{
  3109		struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
  3110		struct drm_device *drm = vc4_hdmi->connector.dev;
  3111	
  3112		if (drm && drm->mode_config.poll_enabled)
  3113			drm_kms_helper_poll_disable(drm);
  3114	
  3115		return pm_runtime_force_suspend(dev);
  3116	}
  3117	
> 3118	static int vc4_hdmi_resume(struct device *dev)
  3119	{
  3120		struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
  3121		struct drm_device *drm = vc4_hdmi->connector.dev;
  3122		int ret;
  3123	
  3124		ret = pm_runtime_force_resume(dev);
  3125	
  3126		if (drm && drm->mode_config.poll_enabled)
  3127			drm_kms_helper_poll_enable(drm);
  3128	
  3129		return ret;
  3130	}
  3131	

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