[PATCH v3 3/5] drm/amd: Fetch the EDID from _DDC if available for eDP

[kernel test robot]

Hi Mario,

kernel test robot noticed the following build warnings:

[auto build test WARNING on rafael-pm/linux-next]
[also build test WARNING on drm-intel/for-linux-next-fixes drm-xe/drm-xe-next linus/master v6.8-rc2 next-20240202]
[cannot apply to drm-misc/drm-misc-next drm-intel/for-linux-next rafael-pm/acpi-bus rafael-pm/devprop]
[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/Mario-Limonciello/ACPI-video-Handle-fetching-EDID-that-is-longer-than-256-bytes/20240202-061301
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link:    https://lore.kernel.org/r/20240201221119.42564-4-mario.limonciello%40amd.com
patch subject: [PATCH v3 3/5] drm/amd: Fetch the EDID from _DDC if available for eDP
config: i386-randconfig-004-20240203 (https://download.01.org/0day-ci/archive/20240203/202402032030.IBEf5Cme-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240203/202402032030.IBEf5Cme-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/202402032030.IBEf5Cme-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c: In function 'create_eml_sink':
>> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:6599:5: warning: 'edid' is used uninitialized in this function [-Wuninitialized]
    6599 |  if (!edid)
         |     ^


vim +/edid +6599 drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c

  6582	
  6583	static void create_eml_sink(struct amdgpu_dm_connector *aconnector)
  6584	{
  6585		struct drm_connector *connector = &aconnector->base;
  6586		struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(&aconnector->base);
  6587		struct dc_sink_init_data init_params = {
  6588				.link = aconnector->dc_link,
  6589				.sink_signal = SIGNAL_TYPE_VIRTUAL
  6590		};
  6591		struct edid *edid;
  6592	
  6593		/*
  6594		 * Note: drm_get_edid gets edid in the following order:
  6595		 * 1) override EDID if set via edid_override debugfs,
  6596		 * 2) firmware EDID if set via edid_firmware module parameter
  6597		 * 3) regular DDC read.
  6598		 */
> 6599		if (!edid)
  6600			edid = drm_get_edid(connector, &amdgpu_connector->ddc_bus->aux.ddc);
  6601	
  6602		if (!edid) {
  6603			DRM_ERROR("No EDID found on connector: %s.\n", connector->name);
  6604			return;
  6605		}
  6606	
  6607		if (drm_detect_hdmi_monitor(edid))
  6608			init_params.sink_signal = SIGNAL_TYPE_HDMI_TYPE_A;
  6609	
  6610		aconnector->edid = edid;
  6611	
  6612		aconnector->dc_em_sink = dc_link_add_remote_sink(
  6613			aconnector->dc_link,
  6614			(uint8_t *)edid,
  6615			(edid->extensions + 1) * EDID_LENGTH,
  6616			&init_params);
  6617	
  6618		if (aconnector->base.force == DRM_FORCE_ON) {
  6619			aconnector->dc_sink = aconnector->dc_link->local_sink ?
  6620			aconnector->dc_link->local_sink :
  6621			aconnector->dc_em_sink;
  6622			dc_sink_retain(aconnector->dc_sink);
  6623		}
  6624	}
  6625	

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