189 static u8 tpg110_readwrite_reg(struct tpg110 *tpg, bool write,  in tpg110_readwrite_reg()  argument
238 	ret = spi_sync(tpg->spi, &m);  in tpg110_readwrite_reg()
240 		dev_err(tpg->dev, "SPI message error %d\n", ret);  in tpg110_readwrite_reg()
249 static u8 tpg110_read_reg(struct tpg110 *tpg, u8 address)  in tpg110_read_reg()  argument
251 	return tpg110_readwrite_reg(tpg, false, address, 0);  in tpg110_read_reg()
254 static void tpg110_write_reg(struct tpg110 *tpg, u8 address, u8 outval)  in tpg110_write_reg()  argument
256 	tpg110_readwrite_reg(tpg, true, address, outval);  in tpg110_write_reg()
259 static int tpg110_startup(struct tpg110 *tpg)  in tpg110_startup()  argument
265 	gpiod_set_value_cansleep(tpg->grestb, 0);  in tpg110_startup()
267 	dev_dbg(tpg->dev, "de-asserted GRESTB\n");  in tpg110_startup()
270 	tpg110_write_reg(tpg, TPG110_TEST, 0x55);  in tpg110_startup()
271 	val = tpg110_read_reg(tpg, TPG110_TEST);  in tpg110_startup()
273 		dev_err(tpg->dev, "failed communication test\n");  in tpg110_startup()
277 	val = tpg110_read_reg(tpg, TPG110_CHIPID);  in tpg110_startup()
278 	dev_info(tpg->dev, "TPG110 chip ID: %d version: %d\n",  in tpg110_startup()
282 	val = tpg110_read_reg(tpg, TPG110_CTRL1);  in tpg110_startup()
286 		dev_info(tpg->dev, "IN 400x240 RGB -> OUT 800x480 RGB (dual scan)\n");  in tpg110_startup()
289 		dev_info(tpg->dev, "IN 480x272 RGB -> OUT 800x480 RGB (dual scan)\n");  in tpg110_startup()
292 		dev_info(tpg->dev, "480x640 RGB\n");  in tpg110_startup()
295 		dev_info(tpg->dev, "480x272 RGB\n");  in tpg110_startup()
298 		dev_info(tpg->dev, "640x480 RGB\n");  in tpg110_startup()
301 		dev_info(tpg->dev, "800x480 RGB\n");  in tpg110_startup()
304 		dev_err(tpg->dev, "ILLEGAL RESOLUTION 0x%02x\n", val);  in tpg110_startup()
317 			tpg->panel_mode = pm;  in tpg110_startup()
322 		dev_err(tpg->dev, "unsupported mode (%02x) detected\n", val);  in tpg110_startup()
326 	val = tpg110_read_reg(tpg, TPG110_CTRL2);  in tpg110_startup()
327 	dev_info(tpg->dev, "resolution and standby is controlled by %s\n",  in tpg110_startup()
331 	tpg110_write_reg(tpg, TPG110_CTRL2, val);  in tpg110_startup()
338 	struct tpg110 *tpg = to_tpg110(panel);  in tpg110_disable()  local
342 	val = tpg110_read_reg(tpg, TPG110_CTRL2_PM);  in tpg110_disable()
344 	tpg110_write_reg(tpg, TPG110_CTRL2_PM, val);  in tpg110_disable()
351 	struct tpg110 *tpg = to_tpg110(panel);  in tpg110_enable()  local
355 	val = tpg110_read_reg(tpg, TPG110_CTRL2_PM);  in tpg110_enable()
357 	tpg110_write_reg(tpg, TPG110_CTRL2_PM, val);  in tpg110_enable()
374 	struct tpg110 *tpg = to_tpg110(panel);  in tpg110_get_modes()  local
377 	connector->display_info.width_mm = tpg->width;  in tpg110_get_modes()
378 	connector->display_info.height_mm = tpg->height;  in tpg110_get_modes()
379 	connector->display_info.bus_flags = tpg->panel_mode->bus_flags;  in tpg110_get_modes()
381 	mode = drm_mode_duplicate(connector->dev, &tpg->panel_mode->mode);  in tpg110_get_modes()
385 	mode->width_mm = tpg->width;  in tpg110_get_modes()
386 	mode->height_mm = tpg->height;  in tpg110_get_modes()
403 	struct tpg110 *tpg;  in tpg110_probe()  local
406 	tpg = devm_kzalloc(dev, sizeof(*tpg), GFP_KERNEL);  in tpg110_probe()
407 	if (!tpg)  in tpg110_probe()
409 	tpg->dev = dev;  in tpg110_probe()
412 	ret = of_property_read_u32(np, "width-mm", &tpg->width);  in tpg110_probe()
415 	ret = of_property_read_u32(np, "height-mm", &tpg->height);  in tpg110_probe()
420 	tpg->grestb = devm_gpiod_get(dev, "grestb", GPIOD_OUT_HIGH);  in tpg110_probe()
421 	if (IS_ERR(tpg->grestb)) {  in tpg110_probe()
433 	tpg->spi = spi;  in tpg110_probe()
435 	ret = tpg110_startup(tpg);  in tpg110_probe()
439 	drm_panel_init(&tpg->panel, dev, &tpg110_drm_funcs,  in tpg110_probe()
442 	ret = drm_panel_of_backlight(&tpg->panel);  in tpg110_probe()
446 	spi_set_drvdata(spi, tpg);  in tpg110_probe()
448 	drm_panel_add(&tpg->panel);  in tpg110_probe()
455 	struct tpg110 *tpg = spi_get_drvdata(spi);  in tpg110_remove()  local
457 	drm_panel_remove(&tpg->panel);  in tpg110_remove()