CC: [email protected] CC: [email protected] TO: Thomas Zimmermann <[email protected]>
tree: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next head: 2ca380ea0e6a31046b7c4048e3f61cfc2f6b2aa3 commit: 2545ac960364d0395802a27374b46f13827b4cf5 [10/24] drm/mgag200: Abstract pixel PLL via struct mgag200_pll :::::: branch date: 4 days ago :::::: commit date: 4 days ago config: x86_64-randconfig-m001-20210812 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <[email protected]> Reported-by: Dan Carpenter <[email protected]> smatch warnings: drivers/gpu/drm/mgag200/mgag200_pll.c:142 mgag200_pixpll_compute_g200se_00() error: uninitialized symbol 'delta'. vim +/delta +142 drivers/gpu/drm/mgag200/mgag200_pll.c 2545ac960364d0 Thomas Zimmermann 2021-07-14 109 2545ac960364d0 Thomas Zimmermann 2021-07-14 110 /* 2545ac960364d0 Thomas Zimmermann 2021-07-14 111 * G200SE 2545ac960364d0 Thomas Zimmermann 2021-07-14 112 */ 2545ac960364d0 Thomas Zimmermann 2021-07-14 113 2545ac960364d0 Thomas Zimmermann 2021-07-14 114 static int mgag200_pixpll_compute_g200se_00(struct mgag200_pll *pixpll, long clock, 2545ac960364d0 Thomas Zimmermann 2021-07-14 115 struct mgag200_pll_values *pixpllc) 2545ac960364d0 Thomas Zimmermann 2021-07-14 116 { 2545ac960364d0 Thomas Zimmermann 2021-07-14 117 static const unsigned int vcomax = 320000; 2545ac960364d0 Thomas Zimmermann 2021-07-14 118 static const unsigned int vcomin = 160000; 2545ac960364d0 Thomas Zimmermann 2021-07-14 119 static const unsigned int pllreffreq = 25000; 2545ac960364d0 Thomas Zimmermann 2021-07-14 120 2545ac960364d0 Thomas Zimmermann 2021-07-14 121 unsigned int delta, tmpdelta, permitteddelta; 2545ac960364d0 Thomas Zimmermann 2021-07-14 122 unsigned int testp, testm, testn; 2545ac960364d0 Thomas Zimmermann 2021-07-14 123 unsigned int p, m, n, s; 2545ac960364d0 Thomas Zimmermann 2021-07-14 124 unsigned int computed; 2545ac960364d0 Thomas Zimmermann 2021-07-14 125 2545ac960364d0 Thomas Zimmermann 2021-07-14 126 m = n = p = s = 0; 2545ac960364d0 Thomas Zimmermann 2021-07-14 127 permitteddelta = clock * 5 / 1000; 2545ac960364d0 Thomas Zimmermann 2021-07-14 128 2545ac960364d0 Thomas Zimmermann 2021-07-14 129 for (testp = 8; testp > 0; testp /= 2) { 2545ac960364d0 Thomas Zimmermann 2021-07-14 130 if (clock * testp > vcomax) 2545ac960364d0 Thomas Zimmermann 2021-07-14 131 continue; 2545ac960364d0 Thomas Zimmermann 2021-07-14 132 if (clock * testp < vcomin) 2545ac960364d0 Thomas Zimmermann 2021-07-14 133 continue; 2545ac960364d0 Thomas Zimmermann 2021-07-14 134 2545ac960364d0 Thomas Zimmermann 2021-07-14 135 for (testn = 17; testn < 256; testn++) { 2545ac960364d0 Thomas Zimmermann 2021-07-14 136 for (testm = 1; testm < 32; testm++) { 2545ac960364d0 Thomas Zimmermann 2021-07-14 137 computed = (pllreffreq * testn) / (testm * testp); 2545ac960364d0 Thomas Zimmermann 2021-07-14 138 if (computed > clock) 2545ac960364d0 Thomas Zimmermann 2021-07-14 139 tmpdelta = computed - clock; 2545ac960364d0 Thomas Zimmermann 2021-07-14 140 else 2545ac960364d0 Thomas Zimmermann 2021-07-14 141 tmpdelta = clock - computed; 2545ac960364d0 Thomas Zimmermann 2021-07-14 @142 if (tmpdelta < delta) { 2545ac960364d0 Thomas Zimmermann 2021-07-14 143 delta = tmpdelta; 2545ac960364d0 Thomas Zimmermann 2021-07-14 144 m = testm; 2545ac960364d0 Thomas Zimmermann 2021-07-14 145 n = testn; 2545ac960364d0 Thomas Zimmermann 2021-07-14 146 p = testp; 2545ac960364d0 Thomas Zimmermann 2021-07-14 147 } 2545ac960364d0 Thomas Zimmermann 2021-07-14 148 } 2545ac960364d0 Thomas Zimmermann 2021-07-14 149 } 2545ac960364d0 Thomas Zimmermann 2021-07-14 150 } 2545ac960364d0 Thomas Zimmermann 2021-07-14 151 2545ac960364d0 Thomas Zimmermann 2021-07-14 152 if (delta > permitteddelta) { 2545ac960364d0 Thomas Zimmermann 2021-07-14 153 pr_warn("PLL delta too large\n"); 2545ac960364d0 Thomas Zimmermann 2021-07-14 154 return -EINVAL; 2545ac960364d0 Thomas Zimmermann 2021-07-14 155 } 2545ac960364d0 Thomas Zimmermann 2021-07-14 156 2545ac960364d0 Thomas Zimmermann 2021-07-14 157 pixpllc->m = m; 2545ac960364d0 Thomas Zimmermann 2021-07-14 158 pixpllc->n = n; 2545ac960364d0 Thomas Zimmermann 2021-07-14 159 pixpllc->p = p; 2545ac960364d0 Thomas Zimmermann 2021-07-14 160 pixpllc->s = s; 2545ac960364d0 Thomas Zimmermann 2021-07-14 161 2545ac960364d0 Thomas Zimmermann 2021-07-14 162 return 0; 2545ac960364d0 Thomas Zimmermann 2021-07-14 163 } 2545ac960364d0 Thomas Zimmermann 2021-07-14 164 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/[email protected]
.config.gz
Description: application/gzip
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