1 // SPDX-License-Identifier: GPL-2.0-only
9 #include <linux/delay.h>
69 	struct i2c_adapter *adap = client->adapter;  in ps8622_set()
73 	msg.addr = client->addr + page;  in ps8622_set()
81 			client->addr + page, reg, val, ret);  in ps8622_set()
87 	struct i2c_client *cl = ps8622->client;  in ps8622_send_config()
138 	/* [7:5] DCO_FTRNG=+-40% */  in ps8622_send_config()
148 	/* Gitune=-37% */  in ps8622_send_config()
168 	/* [7:6] Right-bar GPIO output strength is 8mA */  in ps8622_send_config()
180 	err = ps8622_set(cl, 0x01, 0x02, 0x80 | ps8622->max_lane_count);  in ps8622_send_config()
185 	err = ps8622_set(cl, 0x01, 0x21, 0x80 | ps8622->lane_count);  in ps8622_send_config()
202 	/* Counter number, add 1ms counter delay */  in ps8622_send_config()
207 	/* [6]PWM function control by DPCD0040f[7], default is PWM block */  in ps8622_send_config()
273 	if (ps8622->bl) {  in ps8622_send_config()
274 		/* DPCD720, internal PWM */  in ps8622_send_config()
281 				ps8622->bl->props.brightness);  in ps8622_send_config()
285 		/* DPCD720, external PWM */  in ps8622_send_config()
291 	/* Set LVDS output as 6bit-VESA mapping, single LVDS channel */  in ps8622_send_config()
301 	/* Set SSC enabled and +/-1% central spreading */  in ps8622_send_config()
312 	/* LC -> RCO */  in ps8622_send_config()
321 	return err ? -EIO : 0;  in ps8622_send_config()
326 	struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev);  in ps8622_backlight_update()
327 	int ret, brightness = bl->props.brightness;  in ps8622_backlight_update()
329 	if (bl->props.power != FB_BLANK_UNBLANK ||  in ps8622_backlight_update()
330 	    bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))  in ps8622_backlight_update()
333 	if (!ps8622->enabled)  in ps8622_backlight_update()
334 		return -EINVAL;  in ps8622_backlight_update()
336 	ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness);  in ps8622_backlight_update()
350 	if (ps8622->enabled)  in ps8622_pre_enable()
353 	gpiod_set_value(ps8622->gpio_rst, 0);  in ps8622_pre_enable()
355 	if (ps8622->v12) {  in ps8622_pre_enable()
356 		ret = regulator_enable(ps8622->v12);  in ps8622_pre_enable()
358 			DRM_ERROR("fails to enable ps8622->v12");  in ps8622_pre_enable()
361 	gpiod_set_value(ps8622->gpio_slp, 1);  in ps8622_pre_enable()
376 	gpiod_set_value(ps8622->gpio_rst, 1);  in ps8622_pre_enable()
378 	/* wait 20ms after RST high */  in ps8622_pre_enable()
387 	ps8622->enabled = true;  in ps8622_pre_enable()
392 	/* Delay after panel is disabled */  in ps8622_disable()
400 	if (!ps8622->enabled)  in ps8622_post_disable()
403 	ps8622->enabled = false;  in ps8622_post_disable()
406 	 * This doesn't matter if the regulators are turned off, but something  in ps8622_post_disable()
410 	gpiod_set_value(ps8622->gpio_slp, 0);  in ps8622_post_disable()
412 	if (ps8622->v12)  in ps8622_post_disable()
413 		regulator_disable(ps8622->v12);  in ps8622_post_disable()
421 	gpiod_set_value(ps8622->gpio_rst, 0);  in ps8622_post_disable()
431 	return drm_bridge_attach(ps8622->bridge.encoder, ps8622->panel_bridge,  in ps8622_attach()
432 				 &ps8622->bridge, flags);  in ps8622_attach()
452 	struct device *dev = &client->dev;  in ps8622_probe()
460 		return -ENOMEM;  in ps8622_probe()
462 	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, NULL);  in ps8622_probe()
470 	ps8622->panel_bridge = panel_bridge;  in ps8622_probe()
471 	ps8622->client = client;  in ps8622_probe()
473 	ps8622->v12 = devm_regulator_get(dev, "vdd12");  in ps8622_probe()
474 	if (IS_ERR(ps8622->v12)) {  in ps8622_probe()
476 		ps8622->v12 = NULL;  in ps8622_probe()
479 	ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH);  in ps8622_probe()
480 	if (IS_ERR(ps8622->gpio_slp)) {  in ps8622_probe()
481 		ret = PTR_ERR(ps8622->gpio_slp);  in ps8622_probe()
490 	ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);  in ps8622_probe()
491 	if (IS_ERR(ps8622->gpio_rst)) {  in ps8622_probe()
492 		ret = PTR_ERR(ps8622->gpio_rst);  in ps8622_probe()
497 	ps8622->max_lane_count = id->driver_data;  in ps8622_probe()
499 	if (of_property_read_u32(dev->of_node, "lane-count",  in ps8622_probe()
500 						&ps8622->lane_count)) {  in ps8622_probe()
501 		ps8622->lane_count = ps8622->max_lane_count;  in ps8622_probe()
502 	} else if (ps8622->lane_count > ps8622->max_lane_count) {  in ps8622_probe()
503 		dev_info(dev, "lane-count property is too high,"  in ps8622_probe()
505 		ps8622->lane_count = ps8622->max_lane_count;  in ps8622_probe()
508 	if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) {  in ps8622_probe()
509 		ps8622->bl = backlight_device_register("ps8622-backlight",  in ps8622_probe()
512 		if (IS_ERR(ps8622->bl)) {  in ps8622_probe()
514 			ret = PTR_ERR(ps8622->bl);  in ps8622_probe()
515 			ps8622->bl = NULL;  in ps8622_probe()
518 		ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS;  in ps8622_probe()
519 		ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS;  in ps8622_probe()
522 	ps8622->bridge.funcs = &ps8622_bridge_funcs;  in ps8622_probe()
523 	ps8622->bridge.type = DRM_MODE_CONNECTOR_LVDS;  in ps8622_probe()
524 	ps8622->bridge.of_node = dev->of_node;  in ps8622_probe()
525 	drm_bridge_add(&ps8622->bridge);  in ps8622_probe()
536 	backlight_device_unregister(ps8622->bl);  in ps8622_remove()
537 	drm_bridge_remove(&ps8622->bridge);  in ps8622_remove()
562 MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver");