Re: [PATCH] drm/i915/xelpd: Calculate first_line_bpg_offset for DSC 1.1

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Hi William,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-intel/for-linux-next-fixes]
[also build test ERROR on linus/master v6.5-rc4 next-20230802]
[cannot apply to drm-tip/drm-tip 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/William-Tseng/drm-i915-xelpd-Calculate-first_line_bpg_offset-for-DSC-1-1/20230802-181626
base:   git://anongit.freedesktop.org/drm-intel for-linux-next-fixes
patch link:    https://lore.kernel.org/r/20230802101541.10045-1-william.tseng%40intel.com
patch subject:  [PATCH] drm/i915/xelpd: Calculate first_line_bpg_offset for DSC 1.1
config: x86_64-randconfig-r016-20230731 (https://download.01.org/0day-ci/archive/20230802/202308022109.Mp7MKSId-lkp@xxxxxxxxx/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce: (https://download.01.org/0day-ci/archive/20230802/202308022109.Mp7MKSId-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308022109.Mp7MKSId-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/i915/display/intel_vdsc.c:83:4: error: use of undeclared identifier 'rc'
                           rc->first_line_bpg_offset = 12;
                           ^
   drivers/gpu/drm/i915/display/intel_vdsc.c:85:4: error: use of undeclared identifier 'rc'
                           rc->first_line_bpg_offset = 15;
                           ^
   2 errors generated.


vim +/rc +83 drivers/gpu/drm/i915/display/intel_vdsc.c

    54	
    55	static void
    56	calculate_rc_params(struct drm_dsc_config *vdsc_cfg)
    57	{
    58		int bpc = vdsc_cfg->bits_per_component;
    59		int bpp = vdsc_cfg->bits_per_pixel >> 4;
    60		static const s8 ofs_und6[] = {
    61			0, -2, -2, -4, -6, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12
    62		};
    63		static const s8 ofs_und8[] = {
    64			2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
    65		};
    66		static const s8 ofs_und12[] = {
    67			2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
    68		};
    69		static const s8 ofs_und15[] = {
    70			10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10, -10, -12, -12, -12
    71		};
    72		int qp_bpc_modifier = (bpc - 8) * 2;
    73		u32 res, buf_i, bpp_i;
    74	
    75		if (vdsc_cfg->dsc_version_minor == 2) {
    76			if (vdsc_cfg->slice_height >= 8)
    77				vdsc_cfg->first_line_bpg_offset =
    78					12 + DIV_ROUND_UP((9 * min(34, vdsc_cfg->slice_height - 8)), 100);
    79			else
    80				vdsc_cfg->first_line_bpg_offset = 2 * (vdsc_cfg->slice_height - 1);
    81		} else {
    82			if (bpp == 8)
  > 83				rc->first_line_bpg_offset = 12;
    84			else
    85				rc->first_line_bpg_offset = 15;
    86		}
    87	
    88		/* Our hw supports only 444 modes as of today */
    89		if (bpp >= 12)
    90			vdsc_cfg->initial_offset = 2048;
    91		else if (bpp >= 10)
    92			vdsc_cfg->initial_offset = 5632 - DIV_ROUND_UP(((bpp - 10) * 3584), 2);
    93		else if (bpp >= 8)
    94			vdsc_cfg->initial_offset = 6144 - DIV_ROUND_UP(((bpp - 8) * 512), 2);
    95		else
    96			vdsc_cfg->initial_offset = 6144;
    97	
    98		/* initial_xmit_delay = rc_model_size/2/compression_bpp */
    99		vdsc_cfg->initial_xmit_delay = DIV_ROUND_UP(DSC_RC_MODEL_SIZE_CONST, 2 * bpp);
   100	
   101		vdsc_cfg->flatness_min_qp = 3 + qp_bpc_modifier;
   102		vdsc_cfg->flatness_max_qp = 12 + qp_bpc_modifier;
   103	
   104		vdsc_cfg->rc_quant_incr_limit0 = 11 + qp_bpc_modifier;
   105		vdsc_cfg->rc_quant_incr_limit1 = 11 + qp_bpc_modifier;
   106	
   107		bpp_i  = (2 * (bpp - 6));
   108		for (buf_i = 0; buf_i < DSC_NUM_BUF_RANGES; buf_i++) {
   109			u8 range_bpg_offset;
   110	
   111			/* Read range_minqp and range_max_qp from qp tables */
   112			vdsc_cfg->rc_range_params[buf_i].range_min_qp =
   113				intel_lookup_range_min_qp(bpc, buf_i, bpp_i, vdsc_cfg->native_420);
   114			vdsc_cfg->rc_range_params[buf_i].range_max_qp =
   115				intel_lookup_range_max_qp(bpc, buf_i, bpp_i, vdsc_cfg->native_420);
   116	
   117			/* Calculate range_bpg_offset */
   118			if (bpp <= 6) {
   119				range_bpg_offset = ofs_und6[buf_i];
   120			} else if (bpp <= 8) {
   121				res = DIV_ROUND_UP(((bpp - 6) * (ofs_und8[buf_i] - ofs_und6[buf_i])), 2);
   122				range_bpg_offset = ofs_und6[buf_i] + res;
   123			} else if (bpp <= 12) {
   124				range_bpg_offset = ofs_und8[buf_i];
   125			} else if (bpp <= 15) {
   126				res = DIV_ROUND_UP(((bpp - 12) * (ofs_und15[buf_i] - ofs_und12[buf_i])), 3);
   127				range_bpg_offset = ofs_und12[buf_i] + res;
   128			} else {
   129				range_bpg_offset = ofs_und15[buf_i];
   130			}
   131	
   132			vdsc_cfg->rc_range_params[buf_i].range_bpg_offset =
   133				range_bpg_offset & DSC_RANGE_BPG_OFFSET_MASK;
   134		}
   135	}
   136	

-- 
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https://github.com/intel/lkp-tests/wiki



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