From: kernel test robot <lkp@intel.com>
To: oe-kbuild@lists.linux.dev
Cc: lkp@intel.com, Julia Lawall <julia.lawall@inria.fr>
Subject: [linux-next:master 2966/3989] drivers/gpu/drm/bridge/waveshare-dsi.c:70:5-15: WARNING: Unsigned expression compared with zero: dsi -> lanes < 0
Date: Thu, 05 Mar 2026 22:07:12 +0800 [thread overview]
Message-ID: <202603052201.P6ZmB8VT-lkp@intel.com> (raw)
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: Marek Vasut <marek.vasut+renesas@mailbox.org>
CC: Luca Ceresoli <luca.ceresoli@bootlin.com>
CC: Joseph Guo <qijian.guo@nxp.com>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: fc7b1a72c6cd5cbbd989c6c32a6486e3e4e3594d
commit: fca11428425e92bf21d4a7f5865708c5e64430e4 [2966/3989] drm/bridge: waveshare-dsi: Add support for 1..4 DSI data lanes
:::::: branch date: 23 hours ago
:::::: commit date: 2 days ago
config: powerpc64-randconfig-r054-20260305 (https://download.01.org/0day-ci/archive/20260305/202603052201.P6ZmB8VT-lkp@intel.com/config)
compiler: powerpc64-linux-gcc (GCC) 8.5.0
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Julia Lawall <julia.lawall@inria.fr>
| Closes: https://lore.kernel.org/r/202603052201.P6ZmB8VT-lkp@intel.com/
cocci warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/bridge/waveshare-dsi.c:70:5-15: WARNING: Unsigned expression compared with zero: dsi -> lanes < 0
vim +70 drivers/gpu/drm/bridge/waveshare-dsi.c
dbdea37add132a Joseph Guo 2025-08-06 38
dbdea37add132a Joseph Guo 2025-08-06 39 static int ws_bridge_attach_dsi(struct ws_bridge *ws)
dbdea37add132a Joseph Guo 2025-08-06 40 {
dbdea37add132a Joseph Guo 2025-08-06 41 const struct mipi_dsi_device_info info = {
dbdea37add132a Joseph Guo 2025-08-06 42 .type = "ws-bridge",
dbdea37add132a Joseph Guo 2025-08-06 43 .channel = 0,
dbdea37add132a Joseph Guo 2025-08-06 44 .node = NULL,
dbdea37add132a Joseph Guo 2025-08-06 45 };
dbdea37add132a Joseph Guo 2025-08-06 46 struct device_node *dsi_host_node;
dbdea37add132a Joseph Guo 2025-08-06 47 struct device *dev = ws->dev;
dbdea37add132a Joseph Guo 2025-08-06 48 struct mipi_dsi_device *dsi;
dbdea37add132a Joseph Guo 2025-08-06 49 struct mipi_dsi_host *host;
dbdea37add132a Joseph Guo 2025-08-06 50 int ret;
dbdea37add132a Joseph Guo 2025-08-06 51
dbdea37add132a Joseph Guo 2025-08-06 52 dsi_host_node = of_graph_get_remote_node(dev->of_node, 0, 0);
dbdea37add132a Joseph Guo 2025-08-06 53 if (!dsi_host_node) {
dbdea37add132a Joseph Guo 2025-08-06 54 dev_err(dev, "Failed to get remote port\n");
dbdea37add132a Joseph Guo 2025-08-06 55 return -ENODEV;
dbdea37add132a Joseph Guo 2025-08-06 56 }
dbdea37add132a Joseph Guo 2025-08-06 57 host = of_find_mipi_dsi_host_by_node(dsi_host_node);
dbdea37add132a Joseph Guo 2025-08-06 58 of_node_put(dsi_host_node);
dbdea37add132a Joseph Guo 2025-08-06 59 if (!host)
dbdea37add132a Joseph Guo 2025-08-06 60 return dev_err_probe(dev, -EPROBE_DEFER, "Failed to find dsi_host\n");
dbdea37add132a Joseph Guo 2025-08-06 61
dbdea37add132a Joseph Guo 2025-08-06 62 dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
dbdea37add132a Joseph Guo 2025-08-06 63 if (IS_ERR(dsi))
dbdea37add132a Joseph Guo 2025-08-06 64 return dev_err_probe(dev, PTR_ERR(dsi), "Failed to create dsi device\n");
dbdea37add132a Joseph Guo 2025-08-06 65
dbdea37add132a Joseph Guo 2025-08-06 66 dsi->mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
dbdea37add132a Joseph Guo 2025-08-06 67 MIPI_DSI_CLOCK_NON_CONTINUOUS;
dbdea37add132a Joseph Guo 2025-08-06 68 dsi->format = MIPI_DSI_FMT_RGB888;
fca11428425e92 Marek Vasut 2026-01-15 69 dsi->lanes = drm_of_get_data_lanes_count_ep(dev->of_node, 0, 0, 1, 4);
fca11428425e92 Marek Vasut 2026-01-15 @70 if (dsi->lanes < 0) {
fca11428425e92 Marek Vasut 2026-01-15 71 dev_warn(dev, "Invalid or missing DSI lane count %d, falling back to 2 lanes\n",
fca11428425e92 Marek Vasut 2026-01-15 72 dsi->lanes);
fca11428425e92 Marek Vasut 2026-01-15 73 dsi->lanes = 2; /* Old DT backward compatibility */
fca11428425e92 Marek Vasut 2026-01-15 74 }
dbdea37add132a Joseph Guo 2025-08-06 75
dbdea37add132a Joseph Guo 2025-08-06 76 ret = devm_mipi_dsi_attach(dev, dsi);
dbdea37add132a Joseph Guo 2025-08-06 77 if (ret < 0)
dbdea37add132a Joseph Guo 2025-08-06 78 return dev_err_probe(dev, ret, "Failed to attach dsi to host\n");
dbdea37add132a Joseph Guo 2025-08-06 79
dbdea37add132a Joseph Guo 2025-08-06 80 return 0;
dbdea37add132a Joseph Guo 2025-08-06 81 }
dbdea37add132a Joseph Guo 2025-08-06 82
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
reply other threads:[~2026-03-05 14:08 UTC|newest]
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