[PATCH v2 10/14] drm/msm/dpu: use dpu_perf_cfg in DPU core_perf code

[kernel test robot]

Hi Dmitry,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on linus/master v6.4 next-20230705]
[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/Dmitry-Baryshkov/drm-msm-dpu-drop-enum-dpu_core_perf_data_bus_id/20230704-230618
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20230704150354.159882-11-dmitry.baryshkov%40linaro.org
patch subject: [PATCH v2 10/14] drm/msm/dpu: use dpu_perf_cfg in DPU core_perf code
config: arm-defconfig (https://download.01.org/0day-ci/archive/20230706/202307060717.Jqn298i0-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project.git f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce: (https://download.01.org/0day-ci/archive/20230706/202307060717.Jqn298i0-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/202307060717.Jqn298i0-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c:251:25: warning: variable 'kms' is uninitialized when used here [-Wuninitialized]
           if (atomic_dec_return(&kms->bandwidth_ref) > 0)
                                  ^~~
   drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c:242:21: note: initialize the variable 'kms' to silence this warning
           struct dpu_kms *kms;
                              ^
                               = NULL
   1 warning generated.


vim +/kms +251 drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c

25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  230  
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  231  /**
2785fd47959003 Lee Jones         2020-11-23  232   * dpu_core_perf_crtc_release_bw() - request zero bandwidth
2785fd47959003 Lee Jones         2020-11-23  233   * @crtc: pointer to a crtc
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  234   *
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  235   * Function checks a state variable for the crtc, if all pending commit
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  236   * requests are done, meaning no more bandwidth is needed, release
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  237   * bandwidth request.
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  238   */
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  239  void dpu_core_perf_crtc_release_bw(struct drm_crtc *crtc)
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  240  {
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  241  	struct dpu_crtc *dpu_crtc;
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  242  	struct dpu_kms *kms;
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  243  
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  244  	if (!crtc) {
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  245  		DPU_ERROR("invalid crtc\n");
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  246  		return;
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  247  	}
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  248  
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  249  	dpu_crtc = to_dpu_crtc(crtc);
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  250  
241b507c166fef Rob Clark         2019-08-20 @251  	if (atomic_dec_return(&kms->bandwidth_ref) > 0)
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  252  		return;
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  253  
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  254  	/* Release the bandwidth */
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  255  	if (kms->perf.enable_bw_release) {
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  256  		trace_dpu_cmd_release_bw(crtc->base.id);
5b702d787b47e1 Stephen Boyd      2021-04-30  257  		DRM_DEBUG_ATOMIC("Release BW crtc=%d\n", crtc->base.id);
cb88482e2570f6 Jayant Shekhar    2019-06-18  258  		dpu_crtc->cur_perf.bw_ctl = 0;
cb88482e2570f6 Jayant Shekhar    2019-06-18  259  		_dpu_core_perf_crtc_update_bus(kms, crtc);
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  260  	}
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  261  }
25fdd5933e4c0f Jeykumar Sankaran 2018-06-27  262  

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