Re: [PATCH v1 08/16] drm/i915/bios: support VS/PE Override per each ddi port

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

Hi Michał,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-i915/for-linux-next]
[also build test ERROR on drm-i915/for-linux-next-fixes drm-tip/drm-tip linus/master v7.0-rc6 next-20260331]
[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/Micha-Grzelak/drm-i915-lt-align-xe3plpd-with-VS-PE-Override-layout/20260401-092928
base:   https://gitlab.freedesktop.org/drm/i915/kernel.git for-linux-next
patch link:    https://lore.kernel.org/r/20260331183332.1773886-9-michal.grzelak%40intel.com
patch subject: [PATCH v1 08/16] drm/i915/bios: support VS/PE Override per each ddi port
config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20260402/202604021026.aZi3LxDW-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260402/202604021026.aZi3LxDW-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/202604021026.aZi3LxDW-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/i915/display/intel_bios.c:2767:34: error: cast to union type from type 'int' not present in union
    2767 |         devdata->vswing_preemph.index = (union ddi_vswing_preemph_index) -1;
         |                                         ^                                ~~
   drivers/gpu/drm/i915/display/intel_bios.c:3178:4: error: cast to union type from type 'int' not present in union
    3178 |                         (union ddi_vswing_preemph_index) -1;
         |                         ^                                ~~
   2 errors generated.


vim +/int +2767 drivers/gpu/drm/i915/display/intel_bios.c

  2761	
  2762	static void override_vswing_preemph(struct intel_bios_encoder_data *devdata)
  2763	{
  2764		struct intel_ddi_buf_trans *buf_trans;
  2765	
  2766		devdata->vswing_preemph.buf_trans = NULL;
> 2767		devdata->vswing_preemph.index = (union ddi_vswing_preemph_index) -1;
  2768	
  2769		if (!intel_bios_encoder_overrides_vswing(devdata))
  2770			return;
  2771	
  2772		buf_trans = kzalloc(sizeof(*buf_trans), GFP_KERNEL);
  2773		devdata->vswing_preemph.buf_trans = buf_trans;
  2774	}
  2775	

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