Re: [PATCH v9 3/8] 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-20240523]
[cannot apply to drm-intel/for-linux-next-fixes linus/master v6.9]
[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/drm-i915-Define-and-compute-Transcoder-CMRR-registers/20240524-183131
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
patch link:    https://lore.kernel.org/r/20240524102432.2499104-4-mitulkumar.ajitkumar.golani%40intel.com
patch subject: [PATCH v9 3/8] drm/i915: Compute CMRR and calculate vtotal
config: i386-randconfig-012-20240524 (https://download.01.org/0day-ci/archive/20240525/202405250142.FLXe7CwI-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240525/202405250142.FLXe7CwI-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/202405250142.FLXe7CwI-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:147:(.text+0x446): undefined reference to `__divdi3'
>> ld: drivers/gpu/drm/i915/display/intel_vrr.c:159:(.text+0x564): undefined reference to `__udivdi3'


vim +147 drivers/gpu/drm/i915/display/intel_vrr.c

   135	
   136	static unsigned int
   137	cmrr_get_vtotal(struct intel_crtc_state *crtc_state)
   138	{
   139		int multiplier_m = 1, multiplier_n = 1, vtotal;
   140		int actual_refresh_rate, desired_refresh_rate;
   141		long long actual_pixel_rate, adjusted_pixel_rate, pixel_clock_per_line;
   142		struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
   143	
   144		pixel_clock_per_line =
   145			adjusted_mode->crtc_clock * 1000 / adjusted_mode->crtc_htotal;
   146		actual_refresh_rate =
 > 147			pixel_clock_per_line * FIXED_POINT_PRECISION / adjusted_mode->crtc_vtotal;
   148		desired_refresh_rate = drm_mode_vrefresh(adjusted_mode);
   149		actual_pixel_rate = actual_refresh_rate * adjusted_mode->crtc_vtotal;
   150		actual_pixel_rate =
   151			(actual_pixel_rate * adjusted_mode->crtc_htotal) / FIXED_POINT_PRECISION;
   152	
   153		multiplier_m = 1001;
   154		multiplier_n = 1000;
   155	
   156		crtc_state->cmrr.cmrr_n =
   157			((desired_refresh_rate * adjusted_mode->crtc_htotal * multiplier_n) / multiplier_m);
   158		crtc_state->cmrr.cmrr_n *= multiplier_n;
 > 159		vtotal = (actual_pixel_rate * multiplier_n) / crtc_state->cmrr.cmrr_n;
   160		adjusted_pixel_rate = actual_pixel_rate * multiplier_m;
   161		crtc_state->cmrr.cmrr_m = do_div(adjusted_pixel_rate, crtc_state->cmrr.cmrr_n);
   162	
   163		return vtotal;
   164	}
   165	

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