Re: [PATCH v13 9/9] drm/i915: Compute CMRR and calculate vtotal

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

Hi Mitul,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-intel/for-linux-next]
[also build test ERROR on drm-tip/drm-tip next-20240606]
[cannot apply to drm-intel/for-linux-next-fixes drm/drm-next drm-exynos/exynos-drm-next drm-misc/drm-misc-next linus/master v6.10-rc2]
[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/Mitul-Golani/gpu-drm-i915-Update-indentation-for-VRR-registers-and-bits/20240606-011504
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
patch link:    https://lore.kernel.org/r/20240605170111.494784-10-mitulkumar.ajitkumar.golani%40intel.com
patch subject: [PATCH v13 9/9] drm/i915: Compute CMRR and calculate vtotal
config: i386-randconfig-016-20240606 (https://download.01.org/0day-ci/archive/20240607/202406071749.cjO2itUi-lkp@intel.com/config)
compiler: gcc-12 (Ubuntu 12.3.0-9ubuntu2) 12.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240607/202406071749.cjO2itUi-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/202406071749.cjO2itUi-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: drivers/gpu/drm/i915/display/intel_vrr.o: in function `cmrr_get_vtotal':
>> drivers/gpu/drm/i915/display/intel_vrr.c:152:(.text+0x507): undefined reference to `__udivdi3'


vim +152 drivers/gpu/drm/i915/display/intel_vrr.c

   135	
   136	static unsigned int
   137	cmrr_get_vtotal(struct intel_crtc_state *crtc_state, bool video_mode_required)
   138	{
   139		int multiplier_m = 1, multiplier_n = 1, vtotal, desired_refresh_rate;
   140		long long adjusted_pixel_rate;
   141		struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
   142	
   143		desired_refresh_rate = drm_mode_vrefresh(adjusted_mode);
   144	
   145		if (video_mode_required) {
   146			multiplier_m = 1001;
   147			multiplier_n = 1000;
   148		}
   149	
   150		crtc_state->cmrr.cmrr_n =
   151			desired_refresh_rate * adjusted_mode->crtc_htotal * multiplier_n;
 > 152		vtotal = (adjusted_mode->crtc_clock * 1000 * multiplier_n) / crtc_state->cmrr.cmrr_n;
   153		adjusted_pixel_rate = adjusted_mode->crtc_clock * 1000 * multiplier_m;
   154		crtc_state->cmrr.cmrr_m = do_div(adjusted_pixel_rate, crtc_state->cmrr.cmrr_n);
   155	
   156		return vtotal;
   157	}
   158	

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