Hi Linus, I love your patch! Perhaps something to improve:
[auto build test WARNING on linus/master] [cannot apply to v5.3-rc6 next-20190830] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Linus-Walleij/drm-mcde-Fix-DSI-transfers/20190831-051121 config: x86_64-allyesconfig (attached as .config) compiler: gcc-7 (Debian 7.4.0-11) 7.4.0 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <l...@intel.com> All warnings (new ones prefixed by >>): In file included from include/linux/platform_device.h:13:0, from drivers/gpu/drm/mcde/mcde_dsi.c:9: drivers/gpu/drm/mcde/mcde_dsi.c: In function 'mcde_dsi_host_transfer': >> drivers/gpu/drm/mcde/mcde_dsi.c:304:20: warning: format '%d' expects >> argument of type 'int', but argument 3 has type 'size_t {aka const long >> unsigned int}' [-Wformat=] dev_err(d->dev, "read error, requested %d got %d\n", ^ include/linux/device.h:1416:22: note: in definition of macro 'dev_fmt' #define dev_fmt(fmt) fmt ^~~ >> drivers/gpu/drm/mcde/mcde_dsi.c:304:4: note: in expansion of macro 'dev_err' dev_err(d->dev, "read error, requested %d got %d\n", ^~~~~~~ vim +304 drivers/gpu/drm/mcde/mcde_dsi.c 167 168 #define MCDE_DSI_HOST_IS_READ(type) \ 169 ((type == MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM) || \ 170 (type == MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM) || \ 171 (type == MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM) || \ 172 (type == MIPI_DSI_DCS_READ)) 173 174 static ssize_t mcde_dsi_host_transfer(struct mipi_dsi_host *host, 175 const struct mipi_dsi_msg *msg) 176 { 177 struct mcde_dsi *d = host_to_mcde_dsi(host); 178 const u32 loop_delay_us = 10; /* us */ 179 const u8 *tx = msg->tx_buf; 180 u32 loop_counter; 181 size_t txlen = msg->tx_len; 182 size_t rxlen = msg->rx_len; 183 u32 val; 184 int ret; 185 int i; 186 187 if (txlen > 16) { 188 dev_err(d->dev, 189 "dunno how to write more than 16 bytes yet\n"); 190 return -EIO; 191 } 192 if (rxlen > 4) { 193 dev_err(d->dev, 194 "dunno how to read more than 4 bytes yet\n"); 195 return -EIO; 196 } 197 198 dev_dbg(d->dev, 199 "message to channel %d, write %zd bytes read %zd bytes\n", 200 msg->channel, txlen, rxlen); 201 202 /* Command "nature" */ 203 if (MCDE_DSI_HOST_IS_READ(msg->type)) 204 /* MCTL_MAIN_DATA_CTL already set up */ 205 val = DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_NAT_READ; 206 else 207 val = DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_NAT_WRITE; 208 /* 209 * More than 2 bytes will not fit in a single packet, so it's 210 * time to set the "long not short" bit. One byte is used by 211 * the MIPI DCS command leaving just one byte for the payload 212 * in a short package. 213 */ 214 if (mipi_dsi_packet_format_is_long(msg->type)) 215 val |= DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_LONGNOTSHORT; 216 val |= 0 << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_ID_SHIFT; 217 val |= txlen << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_SIZE_SHIFT; 218 val |= DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_LP_EN; 219 val |= msg->type << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_HEAD_SHIFT; 220 writel(val, d->regs + DSI_DIRECT_CMD_MAIN_SETTINGS); 221 222 /* MIPI DCS command is part of the data */ 223 if (txlen > 0) { 224 val = 0; 225 for (i = 0; i < 4 && i < txlen; i++) 226 val |= tx[i] << (i & 3) * 8; 227 } 228 writel(val, d->regs + DSI_DIRECT_CMD_WRDAT0); 229 if (txlen > 4) { 230 val = 0; 231 for (i = 0; i < 4 && (i + 4) < txlen; i++) 232 val |= tx[i + 4] << (i & 3) * 8; 233 writel(val, d->regs + DSI_DIRECT_CMD_WRDAT1); 234 } 235 if (txlen > 8) { 236 val = 0; 237 for (i = 0; i < 4 && (i + 8) < txlen; i++) 238 val |= tx[i + 8] << (i & 3) * 8; 239 writel(val, d->regs + DSI_DIRECT_CMD_WRDAT2); 240 } 241 if (txlen > 12) { 242 val = 0; 243 for (i = 0; i < 4 && (i + 12) < txlen; i++) 244 val |= tx[i + 12] << (i & 3) * 8; 245 writel(val, d->regs + DSI_DIRECT_CMD_WRDAT3); 246 } 247 248 writel(~0, d->regs + DSI_DIRECT_CMD_STS_CLR); 249 writel(~0, d->regs + DSI_CMD_MODE_STS_CLR); 250 /* Send command */ 251 writel(1, d->regs + DSI_DIRECT_CMD_SEND); 252 253 loop_counter = 1000 * 1000 / loop_delay_us; 254 if (MCDE_DSI_HOST_IS_READ(msg->type)) { 255 /* Read command */ 256 while (!(readl(d->regs + DSI_DIRECT_CMD_STS) & 257 (DSI_DIRECT_CMD_STS_READ_COMPLETED | 258 DSI_DIRECT_CMD_STS_READ_COMPLETED_WITH_ERR)) 259 && --loop_counter) 260 usleep_range(loop_delay_us, (loop_delay_us * 3) / 2); 261 if (!loop_counter) { 262 dev_err(d->dev, "DSI write timeout!\n"); 263 return -ETIME; 264 } 265 } else { 266 /* Writing only */ 267 while (!(readl(d->regs + DSI_DIRECT_CMD_STS) & 268 DSI_DIRECT_CMD_STS_WRITE_COMPLETED) 269 && --loop_counter) 270 usleep_range(loop_delay_us, (loop_delay_us * 3) / 2); 271 272 if (!loop_counter) { 273 dev_err(d->dev, "DSI write timeout!\n"); 274 return -ETIME; 275 } 276 } 277 278 val = readl(d->regs + DSI_DIRECT_CMD_STS); 279 if (val & DSI_DIRECT_CMD_STS_READ_COMPLETED_WITH_ERR) { 280 dev_err(d->dev, "read completed with error\n"); 281 writel(1, d->regs + DSI_DIRECT_CMD_RD_INIT); 282 return -EIO; 283 } 284 if (val & DSI_DIRECT_CMD_STS_ACKNOWLEDGE_WITH_ERR_RECEIVED) { 285 val >>= DSI_DIRECT_CMD_STS_ACK_VAL_SHIFT; 286 dev_err(d->dev, "error during transmission: %04x\n", 287 val); 288 return -EIO; 289 } 290 291 if (!MCDE_DSI_HOST_IS_READ(msg->type)) { 292 /* Return number of bytes written */ 293 ret = txlen; 294 } else { 295 /* OK this is a read command, get the response */ 296 u32 rdsz; 297 u32 rddat; 298 u8 *rx = msg->rx_buf; 299 300 rdsz = readl(d->regs + DSI_DIRECT_CMD_RD_PROPERTY); 301 rdsz &= DSI_DIRECT_CMD_RD_PROPERTY_RD_SIZE_MASK; 302 rddat = readl(d->regs + DSI_DIRECT_CMD_RDDAT); 303 if (rdsz < rxlen) { > 304 dev_err(d->dev, "read error, requested %d got > %d\n", 305 msg->rx_len, rdsz); 306 return -EIO; 307 } 308 /* FIXME: read more than 4 bytes */ 309 for (i = 0; i < 4 && i < rxlen; i++) 310 rx[i] = (rddat >> (i * 8)) & 0xff; 311 ret = rdsz; 312 } 313 314 writel(~0, d->regs + DSI_DIRECT_CMD_STS_CLR); 315 writel(~0, d->regs + DSI_CMD_MODE_STS_CLR); 316 317 return ret; 318 } 319 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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