Hi "Guido, I love your patch! Perhaps something to improve: [auto build test WARNING on linus/master] [cannot apply to v5.3 next-20190920] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Guido-G-nther/drm-bridge-Add-NWL-MIPI-DSI-host-controller-support/20190923-005010 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> smatch warnings: drivers/gpu/drm/bridge/nwl-dsi.c:272 nwl_dsi_config_dpi() warn: unsigned 'color_format' is never less than zero. vim +/color_format +272 drivers/gpu/drm/bridge/nwl-dsi.c 245 246 static int nwl_dsi_config_dpi(struct nwl_dsi *dsi) 247 { 248 u32 color_format, mode; 249 bool burst_mode; 250 int hfront_porch, hback_porch, vfront_porch, vback_porch; 251 int hsync_len, vsync_len; 252 253 hfront_porch = dsi->mode.hsync_start - dsi->mode.hdisplay; 254 hsync_len = dsi->mode.hsync_end - dsi->mode.hsync_start; 255 hback_porch = dsi->mode.htotal - dsi->mode.hsync_end; 256 257 vfront_porch = dsi->mode.vsync_start - dsi->mode.vdisplay; 258 vsync_len = dsi->mode.vsync_end - dsi->mode.vsync_start; 259 vback_porch = dsi->mode.vtotal - dsi->mode.vsync_end; 260 261 DRM_DEV_DEBUG_DRIVER(dsi->dev, "hfront_porch = %d\n", hfront_porch); 262 DRM_DEV_DEBUG_DRIVER(dsi->dev, "hback_porch = %d\n", hback_porch); 263 DRM_DEV_DEBUG_DRIVER(dsi->dev, "hsync_len = %d\n", hsync_len); 264 DRM_DEV_DEBUG_DRIVER(dsi->dev, "hdisplay = %d\n", dsi->mode.hdisplay); 265 DRM_DEV_DEBUG_DRIVER(dsi->dev, "vfront_porch = %d\n", vfront_porch); 266 DRM_DEV_DEBUG_DRIVER(dsi->dev, "vback_porch = %d\n", vback_porch); 267 DRM_DEV_DEBUG_DRIVER(dsi->dev, "vsync_len = %d\n", vsync_len); 268 DRM_DEV_DEBUG_DRIVER(dsi->dev, "vactive = %d\n", dsi->mode.vdisplay); 269 DRM_DEV_DEBUG_DRIVER(dsi->dev, "clock = %d kHz\n", dsi->mode.clock); 270 271 color_format = nwl_dsi_get_dpi_pixel_format(dsi->format); > 272 if (color_format < 0) { 273 DRM_DEV_ERROR(dsi->dev, "Invalid color format 0x%x\n", 274 dsi->format); 275 return color_format; 276 } 277 DRM_DEV_DEBUG_DRIVER(dsi->dev, "pixel fmt = %d\n", dsi->format); 278 279 nwl_dsi_write(dsi, NWL_DSI_INTERFACE_COLOR_CODING, NWL_DSI_DPI_24_BIT); 280 nwl_dsi_write(dsi, NWL_DSI_PIXEL_FORMAT, color_format); 281 /* 282 * Adjusting input polarity based on the video mode results in 283 * a black screen so always pick active low: 284 */ 285 nwl_dsi_write(dsi, NWL_DSI_VSYNC_POLARITY, 286 NWL_DSI_VSYNC_POLARITY_ACTIVE_LOW); 287 nwl_dsi_write(dsi, NWL_DSI_HSYNC_POLARITY, 288 NWL_DSI_HSYNC_POLARITY_ACTIVE_LOW); 289 290 burst_mode = (dsi->dsi_mode_flags & MIPI_DSI_MODE_VIDEO_BURST) && 291 !(dsi->dsi_mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE); 292 293 if (burst_mode) { 294 nwl_dsi_write(dsi, NWL_DSI_VIDEO_MODE, NWL_DSI_VM_BURST_MODE); 295 nwl_dsi_write(dsi, NWL_DSI_PIXEL_FIFO_SEND_LEVEL, 256); 296 } else { 297 mode = ((dsi->dsi_mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) ? 298 NWL_DSI_VM_BURST_MODE_WITH_SYNC_PULSES : 299 NWL_DSI_VM_NON_BURST_MODE_WITH_SYNC_EVENTS); 300 nwl_dsi_write(dsi, NWL_DSI_VIDEO_MODE, mode); 301 nwl_dsi_write(dsi, NWL_DSI_PIXEL_FIFO_SEND_LEVEL, 302 dsi->mode.hdisplay); 303 } 304 305 nwl_dsi_write(dsi, NWL_DSI_HFP, hfront_porch); 306 nwl_dsi_write(dsi, NWL_DSI_HBP, hback_porch); 307 nwl_dsi_write(dsi, NWL_DSI_HSA, hsync_len); 308 309 nwl_dsi_write(dsi, NWL_DSI_ENABLE_MULT_PKTS, 0x0); 310 nwl_dsi_write(dsi, NWL_DSI_BLLP_MODE, 0x1); 311 nwl_dsi_write(dsi, NWL_DSI_USE_NULL_PKT_BLLP, 0x0); 312 nwl_dsi_write(dsi, NWL_DSI_VC, 0x0); 313 314 nwl_dsi_write(dsi, NWL_DSI_PIXEL_PAYLOAD_SIZE, dsi->mode.hdisplay); 315 nwl_dsi_write(dsi, NWL_DSI_VACTIVE, dsi->mode.vdisplay - 1); 316 nwl_dsi_write(dsi, NWL_DSI_VBP, vback_porch); 317 nwl_dsi_write(dsi, NWL_DSI_VFP, vfront_porch); 318 319 return 0; 320 } 321 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
