Commit 07633840 authored by Peter Rosin's avatar Peter Rosin Committed by Andrzej Hajda
Browse files

drm/bridge: lvds-encoder: add powerdown-gpios support 



Optionally power down the LVDS-encoder when it is not in use.

Signed-off-by: default avatarPeter Rosin <peda@axentia.se>
Reviewed-by: default avatarAndrzej Hajda <a.hajda@samsung.com>
Signed-off-by: default avatarAndrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190111151843.11114-6-peda@axentia.se
parent b2304b2e

drivers/gpu/drm/bridge/lvds-encoder.c

+34 −0
Original line number Diff line number Diff line
@@ -11,11 +11,13 @@ 
#include <drm/drm_bridge.h>

#include <drm/drm_panel.h>



#include <linux/gpio/consumer.h>

#include <linux/of_graph.h>



struct lvds_encoder {

	struct drm_bridge bridge;

	struct drm_bridge *panel_bridge;

	struct gpio_desc *powerdown_gpio;

};



static int lvds_encoder_attach(struct drm_bridge *bridge)
@@ -28,8 +30,30 @@ static int lvds_encoder_attach(struct drm_bridge *bridge) 
				 bridge);

}



static void lvds_encoder_enable(struct drm_bridge *bridge)

{

	struct lvds_encoder *lvds_encoder = container_of(bridge,

							 struct lvds_encoder,

							 bridge);



	if (lvds_encoder->powerdown_gpio)

		gpiod_set_value_cansleep(lvds_encoder->powerdown_gpio, 0);

}



static void lvds_encoder_disable(struct drm_bridge *bridge)

{

	struct lvds_encoder *lvds_encoder = container_of(bridge,

							 struct lvds_encoder,

							 bridge);



	if (lvds_encoder->powerdown_gpio)

		gpiod_set_value_cansleep(lvds_encoder->powerdown_gpio, 1);

}



static struct drm_bridge_funcs funcs = {

	.attach = lvds_encoder_attach,

	.enable = lvds_encoder_enable,

	.disable = lvds_encoder_disable,

};



static int lvds_encoder_probe(struct platform_device *pdev)
@@ -45,6 +69,16 @@ static int lvds_encoder_probe(struct platform_device *pdev) 
	if (!lvds_encoder)

		return -ENOMEM;



	lvds_encoder->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown",

							       GPIOD_OUT_HIGH);

	if (IS_ERR(lvds_encoder->powerdown_gpio)) {

		int err = PTR_ERR(lvds_encoder->powerdown_gpio);



		if (err != -EPROBE_DEFER)

			dev_err(dev, "powerdown GPIO failure: %d\n", err);

		return err;

	}



	/* Locate the panel DT node. */

	port = of_graph_get_port_by_id(dev->of_node, 1);

	if (!port) {