1 // SPDX-License-Identifier: GPL-2.0
6  * by the DRM_PANEL_SIMPLE driver because its power sequencing is non-standard.
10 #include <linux/delay.h>
72 	if (p->el3_was_on)  in atana33xc20_suspend()
73 		atana33xc20_wait(p->el_on3_off_time, 150);  in atana33xc20_suspend()
75 	drm_dp_dpcd_set_powered(p->aux, false);  in atana33xc20_suspend()
76 	ret = regulator_disable(p->supply);  in atana33xc20_suspend()
79 	p->powered_off_time = ktime_get_boottime();  in atana33xc20_suspend()
80 	p->el3_was_on = false;  in atana33xc20_suspend()
92 	atana33xc20_wait(p->powered_off_time, 500);  in atana33xc20_resume()
94 	ret = regulator_enable(p->supply);  in atana33xc20_resume()
97 	drm_dp_dpcd_set_powered(p->aux, true);  in atana33xc20_resume()
98 	p->powered_on_time = ktime_get_boottime();  in atana33xc20_resume()
100 	if (p->no_hpd) {  in atana33xc20_resume()
105 	if (p->hpd_gpio) {  in atana33xc20_resume()
106 		ret = readx_poll_timeout(gpiod_get_value_cansleep, p->hpd_gpio,  in atana33xc20_resume()
116 	} else if (p->aux->wait_hpd_asserted) {  in atana33xc20_resume()
117 		ret = p->aux->wait_hpd_asserted(p->aux, HPD_MAX_US);  in atana33xc20_resume()
136 	drm_dp_dpcd_set_powered(p->aux, false);  in atana33xc20_resume()
137 	regulator_disable(p->supply);  in atana33xc20_resume()
146 	/* Disabling when already disabled is a no-op */  in atana33xc20_disable()
147 	if (!p->enabled)  in atana33xc20_disable()
150 	gpiod_set_value_cansleep(p->el_on3_gpio, 0);  in atana33xc20_disable()
151 	p->el_on3_off_time = ktime_get_boottime();  in atana33xc20_disable()
152 	p->enabled = false;  in atana33xc20_disable()
161 	p->el3_was_on = true;  in atana33xc20_disable()
176 	/* Enabling when already enabled is a no-op */  in atana33xc20_enable()
177 	if (p->enabled)  in atana33xc20_enable()
186 	 * non-obvious.  in atana33xc20_enable()
188 	if (WARN_ON(p->el3_was_on))  in atana33xc20_enable()
189 		return -EIO;  in atana33xc20_enable()
195 	atana33xc20_wait(p->powered_on_time, 400);  in atana33xc20_enable()
197 	gpiod_set_value_cansleep(p->el_on3_gpio, 1);  in atana33xc20_enable()
198 	p->enabled = true;  in atana33xc20_enable()
208 	/* Unpreparing when already unprepared is a no-op */  in atana33xc20_unprepare()
209 	if (!p->prepared)  in atana33xc20_unprepare()
213 	 * Purposely do a put_sync, don't use autosuspend. The panel's tcon  in atana33xc20_unprepare()
217 	 * NOTE: we still want autosuspend for cases where we only turn on  in atana33xc20_unprepare()
220 	ret = pm_runtime_put_sync_suspend(panel->dev);  in atana33xc20_unprepare()
223 	p->prepared = false;  in atana33xc20_unprepare()
233 	/* Preparing when already prepared is a no-op */  in atana33xc20_prepare()
234 	if (p->prepared)  in atana33xc20_prepare()
237 	ret = pm_runtime_get_sync(panel->dev);  in atana33xc20_prepare()
239 		pm_runtime_put_autosuspend(panel->dev);  in atana33xc20_prepare()
242 	p->prepared = true;  in atana33xc20_prepare()
251 	struct dp_aux_ep_device *aux_ep = to_dp_aux_ep_dev(panel->dev);  in atana33xc20_get_modes()
254 	pm_runtime_get_sync(panel->dev);  in atana33xc20_get_modes()
256 	if (!p->edid)  in atana33xc20_get_modes()
257 		p->edid = drm_get_edid(connector, &aux_ep->aux->ddc);  in atana33xc20_get_modes()
258 	num = drm_add_edid_modes(connector, p->edid);  in atana33xc20_get_modes()
260 	pm_runtime_mark_last_busy(panel->dev);  in atana33xc20_get_modes()
261 	pm_runtime_put_autosuspend(panel->dev);  in atana33xc20_get_modes()
287 	struct device *dev = &aux_ep->dev;  in atana33xc20_probe()
292 		return -ENOMEM;  in atana33xc20_probe()
295 	panel->aux = aux_ep->aux;  in atana33xc20_probe()
297 	panel->supply = devm_regulator_get(dev, "power");  in atana33xc20_probe()
298 	if (IS_ERR(panel->supply))  in atana33xc20_probe()
299 		return dev_err_probe(dev, PTR_ERR(panel->supply),  in atana33xc20_probe()
302 	panel->el_on3_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);  in atana33xc20_probe()
303 	if (IS_ERR(panel->el_on3_gpio))  in atana33xc20_probe()
304 		return dev_err_probe(dev, PTR_ERR(panel->el_on3_gpio),  in atana33xc20_probe()
307 	panel->no_hpd = of_property_read_bool(dev->of_node, "no-hpd");  in atana33xc20_probe()
308 	if (!panel->no_hpd) {  in atana33xc20_probe()
309 		panel->hpd_gpio = devm_gpiod_get_optional(dev, "hpd", GPIOD_IN);  in atana33xc20_probe()
310 		if (IS_ERR(panel->hpd_gpio))  in atana33xc20_probe()
311 			return dev_err_probe(dev, PTR_ERR(panel->hpd_gpio),  in atana33xc20_probe()
325 	drm_panel_init(&panel->base, dev, &atana33xc20_funcs, DRM_MODE_CONNECTOR_eDP);  in atana33xc20_probe()
328 	ret = drm_panel_dp_aux_backlight(&panel->base, aux_ep->aux);  in atana33xc20_probe()
335 	drm_panel_add(&panel->base);  in atana33xc20_probe()
342 	struct device *dev = &aux_ep->dev;  in atana33xc20_remove()
345 	drm_panel_remove(&panel->base);  in atana33xc20_remove()
346 	drm_panel_disable(&panel->base);  in atana33xc20_remove()
347 	drm_panel_unprepare(&panel->base);  in atana33xc20_remove()
349 	kfree(panel->edid);  in atana33xc20_remove()
354 	struct device *dev = &aux_ep->dev;  in atana33xc20_shutdown()
357 	drm_panel_disable(&panel->base);  in atana33xc20_shutdown()
358 	drm_panel_unprepare(&panel->base);  in atana33xc20_shutdown()