1 // SPDX-License-Identifier: GPL-2.0
6  * by the DRM_PANEL_SIMPLE driver because its power sequencing is non-standard.
68 	 * powering off.  in atana33xc20_suspend()
70 	if (p->el3_was_on)  in atana33xc20_suspend()
71 		atana33xc20_wait(p->el_on3_off_time, 150);  in atana33xc20_suspend()
73 	drm_dp_dpcd_set_powered(p->aux, false);  in atana33xc20_suspend()
74 	ret = regulator_disable(p->supply);  in atana33xc20_suspend()
77 	p->powered_off_time = ktime_get_boottime();  in atana33xc20_suspend()
78 	p->el3_was_on = false;  in atana33xc20_suspend()
90 	atana33xc20_wait(p->powered_off_time, 500);  in atana33xc20_resume()
92 	ret = regulator_enable(p->supply);  in atana33xc20_resume()
95 	drm_dp_dpcd_set_powered(p->aux, true);  in atana33xc20_resume()
96 	p->powered_on_time = ktime_get_boottime();  in atana33xc20_resume()
98 	if (p->no_hpd) {  in atana33xc20_resume()
103 	if (p->hpd_gpio) {  in atana33xc20_resume()
104 		ret = readx_poll_timeout(gpiod_get_value_cansleep, p->hpd_gpio,  in atana33xc20_resume()
114 	} else if (p->aux->wait_hpd_asserted) {  in atana33xc20_resume()
115 		ret = p->aux->wait_hpd_asserted(p->aux, HPD_MAX_US);  in atana33xc20_resume()
134 	drm_dp_dpcd_set_powered(p->aux, false);  in atana33xc20_resume()
135 	regulator_disable(p->supply);  in atana33xc20_resume()
144 	gpiod_set_value_cansleep(p->el_on3_gpio, 0);  in atana33xc20_disable()
145 	p->el_on3_off_time = ktime_get_boottime();  in atana33xc20_disable()
154 	p->el3_was_on = true;  in atana33xc20_disable()
158 	 * powering off.  in atana33xc20_disable()
175 	 * non-obvious.  in atana33xc20_enable()
177 	if (WARN_ON(p->el3_was_on))  in atana33xc20_enable()
178 		return -EIO;  in atana33xc20_enable()
182 	 * to wait 400 ms after powering on before asserting EL3_on.  in atana33xc20_enable()
184 	atana33xc20_wait(p->powered_on_time, 400);  in atana33xc20_enable()
186 	gpiod_set_value_cansleep(p->el_on3_gpio, 1);  in atana33xc20_enable()
198 	 * the best way to ensure it will come back.  in atana33xc20_unprepare()
203 	ret = pm_runtime_put_sync_suspend(panel->dev);  in atana33xc20_unprepare()
214 	ret = pm_runtime_get_sync(panel->dev);  in atana33xc20_prepare()
216 		pm_runtime_put_autosuspend(panel->dev);  in atana33xc20_prepare()
227 	struct dp_aux_ep_device *aux_ep = to_dp_aux_ep_dev(panel->dev);  in atana33xc20_get_modes()
230 	pm_runtime_get_sync(panel->dev);  in atana33xc20_get_modes()
232 	if (!p->drm_edid)  in atana33xc20_get_modes()
233 		p->drm_edid = drm_edid_read_ddc(connector, &aux_ep->aux->ddc);  in atana33xc20_get_modes()
235 	drm_edid_connector_update(connector, p->drm_edid);  in atana33xc20_get_modes()
239 	pm_runtime_mark_last_busy(panel->dev);  in atana33xc20_get_modes()
240 	pm_runtime_put_autosuspend(panel->dev);  in atana33xc20_get_modes()
266 	struct device *dev = &aux_ep->dev;  in atana33xc20_probe()
271 		return -ENOMEM;  in atana33xc20_probe()
274 	panel->aux = aux_ep->aux;  in atana33xc20_probe()
276 	panel->supply = devm_regulator_get(dev, "power");  in atana33xc20_probe()
277 	if (IS_ERR(panel->supply))  in atana33xc20_probe()
278 		return dev_err_probe(dev, PTR_ERR(panel->supply),  in atana33xc20_probe()
281 	panel->el_on3_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);  in atana33xc20_probe()
282 	if (IS_ERR(panel->el_on3_gpio))  in atana33xc20_probe()
283 		return dev_err_probe(dev, PTR_ERR(panel->el_on3_gpio),  in atana33xc20_probe()
286 	panel->no_hpd = of_property_read_bool(dev->of_node, "no-hpd");  in atana33xc20_probe()
287 	if (!panel->no_hpd) {  in atana33xc20_probe()
288 		panel->hpd_gpio = devm_gpiod_get_optional(dev, "hpd", GPIOD_IN);  in atana33xc20_probe()
289 		if (IS_ERR(panel->hpd_gpio))  in atana33xc20_probe()
290 			return dev_err_probe(dev, PTR_ERR(panel->hpd_gpio),  in atana33xc20_probe()
304 	drm_panel_init(&panel->base, dev, &atana33xc20_funcs, DRM_MODE_CONNECTOR_eDP);  in atana33xc20_probe()
307 	ret = drm_panel_dp_aux_backlight(&panel->base, aux_ep->aux);  in atana33xc20_probe()
319 	drm_panel_add(&panel->base);  in atana33xc20_probe()
326 	struct device *dev = &aux_ep->dev;  in atana33xc20_remove()
329 	drm_panel_remove(&panel->base);  in atana33xc20_remove()
331 	drm_edid_free(panel->drm_edid);  in atana33xc20_remove()