diff options
| author | Peter Rosin <peda@axentia.se> | 2019-01-11 15:19:17 +0000 |
|---|---|---|
| committer | Andrzej Hajda <a.hajda@samsung.com> | 2019-01-18 09:27:54 +0100 |
| commit | 076338400db88a70958b39d3dd5754c92a8539e4 (patch) | |
| tree | f0c295583493fa376f74d1cceae803c97359ffba /drivers/gpu/drm/bridge | |
| parent | b2304b2ed6edd7394aa279803e3046c6de7c75a4 (diff) | |
drm/bridge: lvds-encoder: add powerdown-gpios support
Optionally power down the LVDS-encoder when it is not in use.
Signed-off-by: Peter Rosin <peda@axentia.se>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190111151843.11114-6-peda@axentia.se
Diffstat (limited to 'drivers/gpu/drm/bridge')
| -rw-r--r-- | drivers/gpu/drm/bridge/lvds-encoder.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/lvds-encoder.c b/drivers/gpu/drm/bridge/lvds-encoder.c index 7b89fc48a6d0..ae8fc597eb38 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) { |