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From: Peter Rosin <peda@axentia.se>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: Peter Rosin <peda@axentia.se>, David Airlie <airlied@linux.ie>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Archit Taneja <architt@codeaurora.org>,
	Andrzej Hajda <a.hajda@samsung.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	"dri-devel@lists.freedesktop.org"
	<dri-devel@lists.freedesktop.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
Subject: [PATCH v4 5/5] drm/bridge: lvds-encoder: add powerdown-gpios support
Date: Fri, 11 Jan 2019 15:19:17 +0000
Message-ID: <20190111151843.11114-6-peda@axentia.se> (raw)
In-Reply-To: <20190111151843.11114-1-peda@axentia.se>

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

Signed-off-by: Peter Rosin <peda@axentia.se>
---
 drivers/gpu/drm/bridge/lvds-encoder.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/drivers/gpu/drm/bridge/lvds-encoder.c b/drivers/gpu/drm/bridge/lvds-encoder.c
index f6770e83d49d..36d8557bc097 100644
--- a/drivers/gpu/drm/bridge/lvds-encoder.c
+++ b/drivers/gpu/drm/bridge/lvds-encoder.c
@@ -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) {
-- 
2.11.0


  parent reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20190115040858epcas3p4b4b9bfa6f6706842ad92825fea36d59e@epcas3p4.samsung.com>
2019-01-11 15:18 ` [PATCH v4 0/5] drm/bridge: various small lvds-encoder things Peter Rosin
2019-01-11 15:18   ` [PATCH v4 1/5] dt-bindings: display: bridge: fork out ti,ds90c185 from lvds-transmitter Peter Rosin
2019-01-15 20:06     ` Rob Herring
2019-01-11 15:19   ` [PATCH v4 2/5] dt-bindings: display: bridge: lvds-transmitter: cleanup example Peter Rosin
2019-01-11 15:19   ` [PATCH v4 3/5] dt-bindings: display: bridge: thc63lvdm83d: use standard powerdown-gpios Peter Rosin
2019-01-11 15:19   ` [PATCH v4 4/5] drm/bridge: lvds-encoder: add dev helper variable in .probe() Peter Rosin
2019-01-18  7:31     ` Andrzej Hajda
2019-01-11 15:19   ` Peter Rosin [this message]
2019-01-18  7:32     ` [PATCH v4 5/5] drm/bridge: lvds-encoder: add powerdown-gpios support Andrzej Hajda
2019-01-18  8:43   ` [PATCH v4 0/5] drm/bridge: various small lvds-encoder things Andrzej Hajda
2019-01-18 23:11     ` [PATCH] drm/bridge: lvds-encoder: remove surplus NULL checks Peter Rosin
2019-01-21  9:33       ` Daniel Vetter
2019-01-22 21:04       ` Laurent Pinchart

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