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Subjectdrivers/gpu/drm/bridge/sil-sii8620.c:2229: undefined reference to `extcon_find_edev_by_node'
Hi Maciej,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: c1c07416cdd47161a359286021d483f449ad8c4f
commit: 688838442147d9dd94c2ef7c2c31a35cf150c5fa drm/bridge/sii8620: use micro-USB cable detection logic to detect MHL
date: 8 weeks ago
config: i386-randconfig-c0-05060527 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
git checkout 688838442147d9dd94c2ef7c2c31a35cf150c5fa
# save the attached .config to linux build tree
make ARCH=i386

All errors (new ones prefixed by >>):

drivers/gpu/drm/bridge/sil-sii8620.o: In function `sii8620_remove':
drivers/gpu/drm/bridge/sil-sii8620.c:2405: undefined reference to `extcon_unregister_notifier'
drivers/gpu/drm/bridge/sil-sii8620.o: In function `sii8620_extcon_init':
>> drivers/gpu/drm/bridge/sil-sii8620.c:2229: undefined reference to `extcon_find_edev_by_node'
>> drivers/gpu/drm/bridge/sil-sii8620.c:2241: undefined reference to `extcon_register_notifier'
drivers/gpu/drm/bridge/sil-sii8620.o: In function `sii8620_extcon_work':
drivers/gpu/drm/bridge/sil-sii8620.c:2189: undefined reference to `extcon_get_state'

vim +2229 drivers/gpu/drm/bridge/sil-sii8620.c

2212
2213 static int sii8620_extcon_init(struct sii8620 *ctx)
2214 {
2215 struct extcon_dev *edev;
2216 struct device_node *musb, *muic;
2217 int ret;
2218
2219 /* get micro-USB connector node */
2220 musb = of_graph_get_remote_node(ctx->dev->of_node, 1, -1);
2221 /* next get micro-USB Interface Controller node */
2222 muic = of_get_next_parent(musb);
2223
2224 if (!muic) {
2225 dev_info(ctx->dev, "no extcon found, switching to 'always on' mode\n");
2226 return 0;
2227 }
2228
> 2229 edev = extcon_find_edev_by_node(muic);
2230 of_node_put(muic);
2231 if (IS_ERR(edev)) {
2232 if (PTR_ERR(edev) == -EPROBE_DEFER)
2233 return -EPROBE_DEFER;
2234 dev_err(ctx->dev, "Invalid or missing extcon\n");
2235 return PTR_ERR(edev);
2236 }
2237
2238 ctx->extcon = edev;
2239 ctx->extcon_nb.notifier_call = sii8620_extcon_notifier;
2240 INIT_WORK(&ctx->extcon_wq, sii8620_extcon_work);
> 2241 ret = extcon_register_notifier(edev, EXTCON_DISP_MHL, &ctx->extcon_nb);
2242 if (ret) {
2243 dev_err(ctx->dev, "failed to register notifier for MHL\n");
2244 return ret;
2245 }
2246
2247 return 0;
2248 }
2249
2250 static inline struct sii8620 *bridge_to_sii8620(struct drm_bridge *bridge)
2251 {
2252 return container_of(bridge, struct sii8620, bridge);
2253 }
2254
2255 static int sii8620_attach(struct drm_bridge *bridge)
2256 {
2257 struct sii8620 *ctx = bridge_to_sii8620(bridge);
2258
2259 sii8620_init_rcp_input_dev(ctx);
2260
2261 return sii8620_clear_error(ctx);
2262 }
2263
2264 static void sii8620_detach(struct drm_bridge *bridge)
2265 {
2266 struct sii8620 *ctx = bridge_to_sii8620(bridge);
2267
2268 rc_unregister_device(ctx->rc_dev);
2269 }
2270
2271 static enum drm_mode_status sii8620_mode_valid(struct drm_bridge *bridge,
2272 const struct drm_display_mode *mode)
2273 {
2274 struct sii8620 *ctx = bridge_to_sii8620(bridge);
2275 bool can_pack = ctx->devcap[MHL_DCAP_VID_LINK_MODE] &
2276 MHL_DCAP_VID_LINK_PPIXEL;
2277 unsigned int max_pclk = sii8620_is_mhl3(ctx) ? MHL3_MAX_LCLK :
2278 MHL1_MAX_LCLK;
2279 max_pclk /= can_pack ? 2 : 3;
2280
2281 return (mode->clock > max_pclk) ? MODE_CLOCK_HIGH : MODE_OK;
2282 }
2283
2284 static bool sii8620_mode_fixup(struct drm_bridge *bridge,
2285 const struct drm_display_mode *mode,
2286 struct drm_display_mode *adjusted_mode)
2287 {
2288 struct sii8620 *ctx = bridge_to_sii8620(bridge);
2289 int max_lclk;
2290 bool ret = true;
2291
2292 mutex_lock(&ctx->lock);
2293
2294 max_lclk = sii8620_is_mhl3(ctx) ? MHL3_MAX_LCLK : MHL1_MAX_LCLK;
2295 if (max_lclk > 3 * adjusted_mode->clock) {
2296 ctx->use_packed_pixel = 0;
2297 goto end;
2298 }
2299 if ((ctx->devcap[MHL_DCAP_VID_LINK_MODE] & MHL_DCAP_VID_LINK_PPIXEL) &&
2300 max_lclk > 2 * adjusted_mode->clock) {
2301 ctx->use_packed_pixel = 1;
2302 goto end;
2303 }
2304 ret = false;
2305 end:
2306 if (ret) {
2307 u8 vic = drm_match_cea_mode(adjusted_mode);
2308
2309 if (!vic) {
2310 union hdmi_infoframe frm;
2311 u8 mhl_vic[] = { 0, 95, 94, 93, 98 };
2312
2313 /* FIXME: We need the connector here */
2314 drm_hdmi_vendor_infoframe_from_display_mode(
2315 &frm.vendor.hdmi, NULL, adjusted_mode);
2316 vic = frm.vendor.hdmi.vic;
2317 if (vic >= ARRAY_SIZE(mhl_vic))
2318 vic = 0;
2319 vic = mhl_vic[vic];
2320 }
2321 ctx->video_code = vic;
2322 ctx->pixel_clock = adjusted_mode->clock;
2323 }
2324 mutex_unlock(&ctx->lock);
2325 return ret;
2326 }
2327
2328 static const struct drm_bridge_funcs sii8620_bridge_funcs = {
2329 .attach = sii8620_attach,
2330 .detach = sii8620_detach,
2331 .mode_fixup = sii8620_mode_fixup,
2332 .mode_valid = sii8620_mode_valid,
2333 };
2334
2335 static int sii8620_probe(struct i2c_client *client,
2336 const struct i2c_device_id *id)
2337 {
2338 struct device *dev = &client->dev;
2339 struct sii8620 *ctx;
2340 int ret;
2341
2342 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
2343 if (!ctx)
2344 return -ENOMEM;
2345
2346 ctx->dev = dev;
2347 mutex_init(&ctx->lock);
2348 INIT_LIST_HEAD(&ctx->mt_queue);
2349
2350 ctx->clk_xtal = devm_clk_get(dev, "xtal");
2351 if (IS_ERR(ctx->clk_xtal)) {
2352 dev_err(dev, "failed to get xtal clock from DT\n");
2353 return PTR_ERR(ctx->clk_xtal);
2354 }
2355
2356 if (!client->irq) {
2357 dev_err(dev, "no irq provided\n");
2358 return -EINVAL;
2359 }
2360 irq_set_status_flags(client->irq, IRQ_NOAUTOEN);
2361 ret = devm_request_threaded_irq(dev, client->irq, NULL,
2362 sii8620_irq_thread,
2363 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
2364 "sii8620", ctx);
2365 if (ret < 0) {
2366 dev_err(dev, "failed to install IRQ handler\n");
2367 return ret;
2368 }
2369
2370 ctx->gpio_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
2371 if (IS_ERR(ctx->gpio_reset)) {
2372 dev_err(dev, "failed to get reset gpio from DT\n");
2373 return PTR_ERR(ctx->gpio_reset);
2374 }
2375
2376 ctx->supplies[0].supply = "cvcc10";
2377 ctx->supplies[1].supply = "iovcc18";
2378 ret = devm_regulator_bulk_get(dev, 2, ctx->supplies);
2379 if (ret)
2380 return ret;
2381
2382 ret = sii8620_extcon_init(ctx);
2383 if (ret < 0) {
2384 dev_err(ctx->dev, "failed to initialize EXTCON\n");
2385 return ret;
2386 }
2387
2388 i2c_set_clientdata(client, ctx);
2389
2390 ctx->bridge.funcs = &sii8620_bridge_funcs;
2391 ctx->bridge.of_node = dev->of_node;
2392 drm_bridge_add(&ctx->bridge);
2393
2394 if (!ctx->extcon)
2395 sii8620_cable_in(ctx);
2396
2397 return 0;
2398 }
2399
2400 static int sii8620_remove(struct i2c_client *client)
2401 {
2402 struct sii8620 *ctx = i2c_get_clientdata(client);
2403
2404 if (ctx->extcon) {
> 2405 extcon_unregister_notifier(ctx->extcon, EXTCON_DISP_MHL,
2406 &ctx->extcon_nb);
2407 flush_work(&ctx->extcon_wq);
2408 if (ctx->cable_state > 0)
2409 sii8620_cable_out(ctx);
2410 } else {
2411 sii8620_cable_out(ctx);
2412 }
2413 drm_bridge_remove(&ctx->bridge);
2414
2415 return 0;
2416 }
2417

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