Re: [PATCH v2 34/39] drm: bridge: dw_hdmi: switch to ->edid_read callback

[kernel test robot <lkp@intel.com>]

Hi Jani,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next-fixes drm-tip/drm-tip linus/master v6.7-rc8 next-20240103]
[cannot apply to drm-intel/for-linux-next]
[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/Jani-Nikula/drm-bridge-add-edid_read-hook-and-drm_bridge_edid_read/20240103-181513
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/a8f71940221fb085b8767f8123f496c9b36b22cc.1704276309.git.jani.nikula%40intel.com
patch subject: [PATCH v2 34/39] drm: bridge: dw_hdmi: switch to ->edid_read callback
config: powerpc-allmodconfig (https://download.01.org/0day-ci/archive/20240104/202401041305.NcTmAmOJ-lkp@intel.com/config)
compiler: clang version 18.0.0git (https://github.com/llvm/llvm-project 7e186d366d6c7def0543acc255931f617e76dff0)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240104/202401041305.NcTmAmOJ-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401041305.NcTmAmOJ-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c:2473:3: warning: variable 'edid' is uninitialized when used here [-Wuninitialized]
    2473 |                 edid->width_cm, edid->height_cm);
         |                 ^~~~
   include/linux/dev_printk.h:155:39: note: expanded from macro 'dev_dbg'
     155 |         dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
         |                                              ^~~~~~~~~~~
   include/linux/dynamic_debug.h:274:19: note: expanded from macro 'dynamic_dev_dbg'
     274 |                            dev, fmt, ##__VA_ARGS__)
         |                                        ^~~~~~~~~~~
   include/linux/dynamic_debug.h:250:59: note: expanded from macro '_dynamic_func_call'
     250 |         _dynamic_func_call_cls(_DPRINTK_CLASS_DFLT, fmt, func, ##__VA_ARGS__)
         |                                                                  ^~~~~~~~~~~
   include/linux/dynamic_debug.h:248:65: note: expanded from macro '_dynamic_func_call_cls'
     248 |         __dynamic_func_call_cls(__UNIQUE_ID(ddebug), cls, fmt, func, ##__VA_ARGS__)
         |                                                                        ^~~~~~~~~~~
   include/linux/dynamic_debug.h:224:15: note: expanded from macro '__dynamic_func_call_cls'
     224 |                 func(&id, ##__VA_ARGS__);                       \
         |                             ^~~~~~~~~~~
   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c:2461:25: note: initialize the variable 'edid' to silence this warning
    2461 |         const struct edid *edid;
         |                                ^
         |                                 = NULL
   1 warning generated.


vim +/edid +2473 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c

9aaf880ed4ee3c drivers/staging/imx-drm/imx-hdmi.c        Fabio Estevam    2013-11-29  2456  
fcb55de55cf341 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Jani Nikula      2024-01-03  2457  static const struct drm_edid *dw_hdmi_edid_read(struct dw_hdmi *hdmi,
ec971aaa6775cf drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Laurent Pinchart 2020-05-26  2458  						struct drm_connector *connector)
9aaf880ed4ee3c drivers/staging/imx-drm/imx-hdmi.c        Fabio Estevam    2013-11-29  2459  {
fcb55de55cf341 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Jani Nikula      2024-01-03  2460  	const struct drm_edid *drm_edid;
fcb55de55cf341 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Jani Nikula      2024-01-03  2461  	const struct edid *edid;
9aaf880ed4ee3c drivers/staging/imx-drm/imx-hdmi.c        Fabio Estevam    2013-11-29  2462  
9aaf880ed4ee3c drivers/staging/imx-drm/imx-hdmi.c        Fabio Estevam    2013-11-29  2463  	if (!hdmi->ddc)
ec971aaa6775cf drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Laurent Pinchart 2020-05-26  2464  		return NULL;
9aaf880ed4ee3c drivers/staging/imx-drm/imx-hdmi.c        Fabio Estevam    2013-11-29  2465  
fcb55de55cf341 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Jani Nikula      2024-01-03  2466  	drm_edid = drm_edid_read_ddc(connector, hdmi->ddc);
fcb55de55cf341 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Jani Nikula      2024-01-03  2467  	if (!drm_edid) {
ec971aaa6775cf drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Laurent Pinchart 2020-05-26  2468  		dev_dbg(hdmi->dev, "failed to get edid\n");
ec971aaa6775cf drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Laurent Pinchart 2020-05-26  2469  		return NULL;
ec971aaa6775cf drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Laurent Pinchart 2020-05-26  2470  	}
ec971aaa6775cf drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Laurent Pinchart 2020-05-26  2471  
9aaf880ed4ee3c drivers/staging/imx-drm/imx-hdmi.c        Fabio Estevam    2013-11-29  2472  	dev_dbg(hdmi->dev, "got edid: width[%d] x height[%d]\n",
9aaf880ed4ee3c drivers/staging/imx-drm/imx-hdmi.c        Fabio Estevam    2013-11-29 @2473  		edid->width_cm, edid->height_cm);
9aaf880ed4ee3c drivers/staging/imx-drm/imx-hdmi.c        Fabio Estevam    2013-11-29  2474  
fcb55de55cf341 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Jani Nikula      2024-01-03  2475  	/*
fcb55de55cf341 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Jani Nikula      2024-01-03  2476  	 * FIXME: This should use connector->display_info.is_hdmi and
fcb55de55cf341 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Jani Nikula      2024-01-03  2477  	 * connector->display_info.has_audio from a path that has read the EDID
fcb55de55cf341 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Jani Nikula      2024-01-03  2478  	 * and called drm_edid_connector_update().
fcb55de55cf341 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Jani Nikula      2024-01-03  2479  	 */
fcb55de55cf341 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Jani Nikula      2024-01-03  2480  	edid = drm_edid_raw(drm_edid);
fcb55de55cf341 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Jani Nikula      2024-01-03  2481  
05b1342f5014b7 drivers/gpu/drm/bridge/dw_hdmi.c          Russell King     2015-07-21  2482  	hdmi->sink_is_hdmi = drm_detect_hdmi_monitor(edid);
f709ec07e38a71 drivers/gpu/drm/bridge/dw_hdmi.c          Russell King     2015-07-21  2483  	hdmi->sink_has_audio = drm_detect_monitor_audio(edid);
ec971aaa6775cf drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Laurent Pinchart 2020-05-26  2484  
fcb55de55cf341 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Jani Nikula      2024-01-03  2485  	return drm_edid;
ec971aaa6775cf drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Laurent Pinchart 2020-05-26  2486  }
ec971aaa6775cf drivers/gpu/drm/bridge/synopsys/dw-hdmi.c Laurent Pinchart 2020-05-26  2487  

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