[wsa:coccinelle/of_device_get_match_data 4/19] drivers/gpu/drm/exynos/exynos_drm_gsc.c:1232:21: warning: assignment discards 'const' qualifier from pointer target type

[wsa:coccinelle/of_device_get_match_data 4/19] drivers/gpu/drm/exynos/exynos_drm_gsc.c:1232:21: warning: assignment discards 'const' qualifier from pointer target type

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git coccinelle/of_device_get_match_data
head:   855d01e7ecabcc51ac572795173d15205ecc208b
commit: c0f694afe329f7401326749f83356dd3baa7687b [4/19] drm/exynos: don't cast result of of_device_get_match_data()
config: nds32-randconfig-r032-20210919 (attached as .config)
compiler: nds32le-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git/commit/?id=c0f694afe329f7401326749f83356dd3baa7687b
        git remote add wsa https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git
        git fetch --no-tags wsa coccinelle/of_device_get_match_data
        git checkout c0f694afe329f7401326749f83356dd3baa7687b
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=nds32 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/exynos/exynos_drm_gsc.c: In function 'gsc_probe':
>> drivers/gpu/drm/exynos/exynos_drm_gsc.c:1232:21: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
    1232 |         driver_data = of_device_get_match_data(dev);
         |                     ^


vim +/const +1232 drivers/gpu/drm/exynos/exynos_drm_gsc.c

  1218	
  1219	static int gsc_probe(struct platform_device *pdev)
  1220	{
  1221		struct device *dev = &pdev->dev;
  1222		struct gsc_driverdata *driver_data;
  1223		struct exynos_drm_ipp_formats *formats;
  1224		struct gsc_context *ctx;
  1225		struct resource *res;
  1226		int num_formats, ret, i, j;
  1227	
  1228		ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
  1229		if (!ctx)
  1230			return -ENOMEM;
  1231	
> 1232		driver_data = of_device_get_match_data(dev);
  1233		ctx->dev = dev;
  1234		ctx->num_clocks = driver_data->num_clocks;
  1235		ctx->clk_names = driver_data->clk_names;
  1236	
  1237		/* construct formats/limits array */
  1238		num_formats = ARRAY_SIZE(gsc_formats) + ARRAY_SIZE(gsc_tiled_formats);
  1239		formats = devm_kcalloc(dev, num_formats, sizeof(*formats), GFP_KERNEL);
  1240		if (!formats)
  1241			return -ENOMEM;
  1242	
  1243		/* linear formats */
  1244		for (i = 0; i < ARRAY_SIZE(gsc_formats); i++) {
  1245			formats[i].fourcc = gsc_formats[i];
  1246			formats[i].type = DRM_EXYNOS_IPP_FORMAT_SOURCE |
  1247					  DRM_EXYNOS_IPP_FORMAT_DESTINATION;
  1248			formats[i].limits = driver_data->limits;
  1249			formats[i].num_limits = driver_data->num_limits;
  1250		}
  1251	
  1252		/* tiled formats */
  1253		for (j = i, i = 0; i < ARRAY_SIZE(gsc_tiled_formats); j++, i++) {
  1254			formats[j].fourcc = gsc_tiled_formats[i];
  1255			formats[j].modifier = DRM_FORMAT_MOD_SAMSUNG_16_16_TILE;
  1256			formats[j].type = DRM_EXYNOS_IPP_FORMAT_SOURCE |
  1257					  DRM_EXYNOS_IPP_FORMAT_DESTINATION;
  1258			formats[j].limits = driver_data->limits;
  1259			formats[j].num_limits = driver_data->num_limits;
  1260		}
  1261	
  1262		ctx->formats = formats;
  1263		ctx->num_formats = num_formats;
  1264	
  1265		/* clock control */
  1266		for (i = 0; i < ctx->num_clocks; i++) {
  1267			ctx->clocks[i] = devm_clk_get(dev, ctx->clk_names[i]);
  1268			if (IS_ERR(ctx->clocks[i])) {
  1269				dev_err(dev, "failed to get clock: %s\n",
  1270					ctx->clk_names[i]);
  1271				return PTR_ERR(ctx->clocks[i]);
  1272			}
  1273		}
  1274	
  1275		/* resource memory */
  1276		ctx->regs_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  1277		ctx->regs = devm_ioremap_resource(dev, ctx->regs_res);
  1278		if (IS_ERR(ctx->regs))
  1279			return PTR_ERR(ctx->regs);
  1280	
  1281		/* resource irq */
  1282		res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  1283		if (!res) {
  1284			dev_err(dev, "failed to request irq resource.\n");
  1285			return -ENOENT;
  1286		}
  1287	
  1288		ctx->irq = res->start;
  1289		ret = devm_request_irq(dev, ctx->irq, gsc_irq_handler, 0,
  1290				       dev_name(dev), ctx);
  1291		if (ret < 0) {
  1292			dev_err(dev, "failed to request irq.\n");
  1293			return ret;
  1294		}
  1295	
  1296		/* context initailization */
  1297		ctx->id = pdev->id;
  1298	
  1299		platform_set_drvdata(pdev, ctx);
  1300	
  1301		pm_runtime_use_autosuspend(dev);
  1302		pm_runtime_set_autosuspend_delay(dev, GSC_AUTOSUSPEND_DELAY);
  1303		pm_runtime_enable(dev);
  1304	
  1305		ret = component_add(dev, &gsc_component_ops);
  1306		if (ret)
  1307			goto err_pm_dis;
  1308	
  1309		dev_info(dev, "drm gsc registered successfully.\n");
  1310	
  1311		return 0;
  1312	
  1313	err_pm_dis:
  1314		pm_runtime_dont_use_autosuspend(dev);
  1315		pm_runtime_disable(dev);
  1316		return ret;
  1317	}
  1318	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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