Re: [PATCH v5 03/10] dmaengine: Actions: Add support for S700 DMA engine

From: kernel test robot
Date: Thu Jul 02 2020 - 18:43:14 EST

Hi Amit,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on robh/for-next]
[also build test WARNING on clk/clk-next pza/reset/next linus/master v5.8-rc3 next-20200702]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use as documented in
https://git-scm.com/docs/git-format-patch]

url: https://github.com/0day-ci/linux/commits/Amit-Singh-Tomar/Add-MMC-and-DMA-support-for-Actions-S700/20200702-225741
base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: arm64-randconfig-r002-20200701 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 003a086ffc0d1affbb8300b36225fb8150a2d40a)
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
# install arm64 cross compiling tool for clang build
# apt-get install binutils-aarch64-linux-gnu
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64

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

All warnings (new ones prefixed by >>):

>> drivers/dma/owl-dma.c:1117:14: warning: cast to smaller integer type 'enum owl_dma_id' from 'const void *' [-Wvoid-pointer-to-enum-cast]
od->devid = (enum owl_dma_id)of_device_get_match_data(&pdev->dev);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.

vim +1117 drivers/dma/owl-dma.c

1087
1088 static int owl_dma_probe(struct platform_device *pdev)
1089 {
1090 struct device_node *np = pdev->dev.of_node;
1091 struct owl_dma *od;
1092 int ret, i, nr_channels, nr_requests;
1093
1094 od = devm_kzalloc(&pdev->dev, sizeof(*od), GFP_KERNEL);
1095 if (!od)
1096 return -ENOMEM;
1097
1098 od->base = devm_platform_ioremap_resource(pdev, 0);
1099 if (IS_ERR(od->base))
1100 return PTR_ERR(od->base);
1101
1102 ret = of_property_read_u32(np, "dma-channels", &nr_channels);
1103 if (ret) {
1104 dev_err(&pdev->dev, "can't get dma-channels\n");
1105 return ret;
1106 }
1107
1108 ret = of_property_read_u32(np, "dma-requests", &nr_requests);
1109 if (ret) {
1110 dev_err(&pdev->dev, "can't get dma-requests\n");
1111 return ret;
1112 }
1113
1114 dev_info(&pdev->dev, "dma-channels %d, dma-requests %d\n",
1115 nr_channels, nr_requests);
1116
> 1117 od->devid = (enum owl_dma_id)of_device_get_match_data(&pdev->dev);
1118
1119 od->nr_pchans = nr_channels;
1120 od->nr_vchans = nr_requests;
1121
1122 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
1123
1124 platform_set_drvdata(pdev, od);
1125 spin_lock_init(&od->lock);
1126
1127 dma_cap_set(DMA_MEMCPY, od->dma.cap_mask);
1128 dma_cap_set(DMA_SLAVE, od->dma.cap_mask);
1129 dma_cap_set(DMA_CYCLIC, od->dma.cap_mask);
1130
1131 od->dma.dev = &pdev->dev;
1132 od->dma.device_free_chan_resources = owl_dma_free_chan_resources;
1133 od->dma.device_tx_status = owl_dma_tx_status;
1134 od->dma.device_issue_pending = owl_dma_issue_pending;
1135 od->dma.device_prep_dma_memcpy = owl_dma_prep_memcpy;
1136 od->dma.device_prep_slave_sg = owl_dma_prep_slave_sg;
1137 od->dma.device_prep_dma_cyclic = owl_prep_dma_cyclic;
1138 od->dma.device_config = owl_dma_config;
1139 od->dma.device_pause = owl_dma_pause;
1140 od->dma.device_resume = owl_dma_resume;
1141 od->dma.device_terminate_all = owl_dma_terminate_all;
1142 od->dma.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
1143 od->dma.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
1144 od->dma.directions = BIT(DMA_MEM_TO_MEM);
1145 od->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1146
1147 INIT_LIST_HEAD(&od->dma.channels);
1148
1149 od->clk = devm_clk_get(&pdev->dev, NULL);
1150 if (IS_ERR(od->clk)) {
1151 dev_err(&pdev->dev, "unable to get clock\n");
1152 return PTR_ERR(od->clk);
1153 }
1154
1155 /*
1156 * Eventhough the DMA controller is capable of generating 4
1157 * IRQ's for DMA priority feature, we only use 1 IRQ for
1158 * simplification.
1159 */
1160 od->irq = platform_get_irq(pdev, 0);
1161 ret = devm_request_irq(&pdev->dev, od->irq, owl_dma_interrupt, 0,
1162 dev_name(&pdev->dev), od);
1163 if (ret) {
1164 dev_err(&pdev->dev, "unable to request IRQ\n");
1165 return ret;
1166 }
1167
1168 /* Init physical channel */
1169 od->pchans = devm_kcalloc(&pdev->dev, od->nr_pchans,
1170 sizeof(struct owl_dma_pchan), GFP_KERNEL);
1171 if (!od->pchans)
1172 return -ENOMEM;
1173
1174 for (i = 0; i < od->nr_pchans; i++) {
1175 struct owl_dma_pchan *pchan = &od->pchans[i];
1176
1177 pchan->id = i;
1178 pchan->base = od->base + OWL_DMA_CHAN_BASE(i);
1179 }
1180
1181 /* Init virtual channel */
1182 od->vchans = devm_kcalloc(&pdev->dev, od->nr_vchans,
1183 sizeof(struct owl_dma_vchan), GFP_KERNEL);
1184 if (!od->vchans)
1185 return -ENOMEM;
1186
1187 for (i = 0; i < od->nr_vchans; i++) {
1188 struct owl_dma_vchan *vchan = &od->vchans[i];
1189
1190 vchan->vc.desc_free = owl_dma_desc_free;
1191 vchan_init(&vchan->vc, &od->dma);
1192 }
1193
1194 /* Create a pool of consistent memory blocks for hardware descriptors */
1195 od->lli_pool = dma_pool_create(dev_name(od->dma.dev), od->dma.dev,
1196 sizeof(struct owl_dma_lli),
1197 __alignof__(struct owl_dma_lli),
1198 0);
1199 if (!od->lli_pool) {
1200 dev_err(&pdev->dev, "unable to allocate DMA descriptor pool\n");
1201 return -ENOMEM;
1202 }
1203
1204 clk_prepare_enable(od->clk);
1205
1206 ret = dma_async_device_register(&od->dma);
1207 if (ret) {
1208 dev_err(&pdev->dev, "failed to register DMA engine device\n");
1209 goto err_pool_free;
1210 }
1211
1212 /* Device-tree DMA controller registration */
1213 ret = of_dma_controller_register(pdev->dev.of_node,
1214 owl_dma_of_xlate, od);
1215 if (ret) {
1216 dev_err(&pdev->dev, "of_dma_controller_register failed\n");
1217 goto err_dma_unregister;
1218 }
1219
1220 return 0;
1221
1222 err_dma_unregister:
1223 dma_async_device_unregister(&od->dma);
1224 err_pool_free:
1225 clk_disable_unprepare(od->clk);
1226 dma_pool_destroy(od->lli_pool);
1227
1228 return ret;
1229 }
1230

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

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