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>
22 /* T3 VCC to HPD high is max 200 ms */
69 	 * specifies to wait 150 ms after deasserting EL3_ON before  in atana33xc20_suspend()
72 	if (p->el3_was_on)  in atana33xc20_suspend()
73 		atana33xc20_wait(p->el_on3_off_time, 150);  in atana33xc20_suspend()
75 	ret = regulator_disable(p->supply);  in atana33xc20_suspend()
78 	p->powered_off_time = ktime_get();  in atana33xc20_suspend()
79 	p->el3_was_on = false;  in atana33xc20_suspend()
90 	/* T12 (Power off time) is min 500 ms */  in atana33xc20_resume()
91 	atana33xc20_wait(p->powered_off_time, 500);  in atana33xc20_resume()
93 	ret = regulator_enable(p->supply);  in atana33xc20_resume()
96 	p->powered_on_time = ktime_get();  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()
116 	if (p->aux->wait_hpd_asserted) {  in atana33xc20_resume()
117 		ret = p->aux->wait_hpd_asserted(p->aux, HPD_MAX_US);  in atana33xc20_resume()
140 	/* Disabling when already disabled is a no-op */  in atana33xc20_disable()
141 	if (!p->enabled)  in atana33xc20_disable()
144 	gpiod_set_value_cansleep(p->el_on3_gpio, 0);  in atana33xc20_disable()
145 	p->el_on3_off_time = ktime_get();  in atana33xc20_disable()
146 	p->enabled = false;  in atana33xc20_disable()
155 	p->el3_was_on = true;  in atana33xc20_disable()
158 	 * Sleeping 20 ms here (after setting the GPIO) avoids a glitch when  in atana33xc20_disable()
170 	/* Enabling when already enabled is a no-op */  in atana33xc20_enable()
171 	if (p->enabled)  in atana33xc20_enable()
180 	 * non-obvious.  in atana33xc20_enable()
182 	if (WARN_ON(p->el3_was_on))  in atana33xc20_enable()
183 		return -EIO;  in atana33xc20_enable()
187 	 * to wait 400 ms after powering on before asserting EL3_on.  in atana33xc20_enable()
189 	atana33xc20_wait(p->powered_on_time, 400);  in atana33xc20_enable()
191 	gpiod_set_value_cansleep(p->el_on3_gpio, 1);  in atana33xc20_enable()
192 	p->enabled = true;  in atana33xc20_enable()
202 	/* Unpreparing when already unprepared is a no-op */  in atana33xc20_unprepare()
203 	if (!p->prepared)  in atana33xc20_unprepare()
207 	 * Purposely do a put_sync, don't use autosuspend. The panel's tcon  in atana33xc20_unprepare()
211 	 * NOTE: we still want autosuspend for cases where we only turn on  in atana33xc20_unprepare()
214 	ret = pm_runtime_put_sync_suspend(panel->dev);  in atana33xc20_unprepare()
217 	p->prepared = false;  in atana33xc20_unprepare()
227 	/* Preparing when already prepared is a no-op */  in atana33xc20_prepare()
228 	if (p->prepared)  in atana33xc20_prepare()
231 	ret = pm_runtime_get_sync(panel->dev);  in atana33xc20_prepare()
233 		pm_runtime_put_autosuspend(panel->dev);  in atana33xc20_prepare()
236 	p->prepared = true;  in atana33xc20_prepare()
245 	struct dp_aux_ep_device *aux_ep = to_dp_aux_ep_dev(panel->dev);  in atana33xc20_get_modes()
248 	pm_runtime_get_sync(panel->dev);  in atana33xc20_get_modes()
250 	if (!p->edid)  in atana33xc20_get_modes()
251 		p->edid = drm_get_edid(connector, &aux_ep->aux->ddc);  in atana33xc20_get_modes()
252 	num = drm_add_edid_modes(connector, p->edid);  in atana33xc20_get_modes()
254 	pm_runtime_mark_last_busy(panel->dev);  in atana33xc20_get_modes()
255 	pm_runtime_put_autosuspend(panel->dev);  in atana33xc20_get_modes()
281 	struct device *dev = &aux_ep->dev;  in atana33xc20_probe()
286 		return -ENOMEM;  in atana33xc20_probe()
289 	panel->aux = aux_ep->aux;  in atana33xc20_probe()
291 	panel->supply = devm_regulator_get(dev, "power");  in atana33xc20_probe()
292 	if (IS_ERR(panel->supply))  in atana33xc20_probe()
293 		return dev_err_probe(dev, PTR_ERR(panel->supply),  in atana33xc20_probe()
296 	panel->el_on3_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);  in atana33xc20_probe()
297 	if (IS_ERR(panel->el_on3_gpio))  in atana33xc20_probe()
298 		return dev_err_probe(dev, PTR_ERR(panel->el_on3_gpio),  in atana33xc20_probe()
301 	panel->no_hpd = of_property_read_bool(dev->of_node, "no-hpd");  in atana33xc20_probe()
302 	if (!panel->no_hpd) {  in atana33xc20_probe()
303 		panel->hpd_gpio = devm_gpiod_get_optional(dev, "hpd", GPIOD_IN);  in atana33xc20_probe()
304 		if (IS_ERR(panel->hpd_gpio))  in atana33xc20_probe()
305 			return dev_err_probe(dev, PTR_ERR(panel->hpd_gpio),  in atana33xc20_probe()
319 	drm_panel_init(&panel->base, dev, &atana33xc20_funcs, DRM_MODE_CONNECTOR_eDP);  in atana33xc20_probe()
322 	ret = drm_panel_dp_aux_backlight(&panel->base, aux_ep->aux);  in atana33xc20_probe()
329 	drm_panel_add(&panel->base);  in atana33xc20_probe()
336 	struct device *dev = &aux_ep->dev;  in atana33xc20_remove()
339 	drm_panel_remove(&panel->base);  in atana33xc20_remove()
340 	drm_panel_disable(&panel->base);  in atana33xc20_remove()
341 	drm_panel_unprepare(&panel->base);  in atana33xc20_remove()
343 	kfree(panel->edid);  in atana33xc20_remove()
348 	struct device *dev = &aux_ep->dev;  in atana33xc20_shutdown()
351 	drm_panel_disable(&panel->base);  in atana33xc20_shutdown()
352 	drm_panel_unprepare(&panel->base);  in atana33xc20_shutdown()