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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2019 Renesas Electronics Corporation
* Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*/
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
struct lvds_codec {
struct device *dev;
struct drm_bridge bridge;
struct drm_bridge *panel_bridge;
struct drm_bridge_timings timings;
struct regulator *vcc;
struct gpio_desc *powerdown_gpio;
u32 connector_type;
unsigned int bus_format;
};
static inline struct lvds_codec *to_lvds_codec(struct drm_bridge *bridge)
{
return container_of(bridge, struct lvds_codec, bridge);
}
static int lvds_codec_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
return drm_bridge_attach(bridge->encoder, lvds_codec->panel_bridge,
bridge, flags);
}
static void lvds_codec_enable(struct drm_bridge *bridge)
{
struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
int ret;
ret = regulator_enable(lvds_codec->vcc);
if (ret) {
dev_err(lvds_codec->dev,
"Failed to enable regulator \"vcc\": %d\n", ret);
return;
}
if (lvds_codec->powerdown_gpio)
gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 0);
}
static void lvds_codec_disable(struct drm_bridge *bridge)
{
struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
int ret;
if (lvds_codec->powerdown_gpio)
gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 1);
ret = regulator_disable(lvds_codec->vcc);
if (ret)
dev_err(lvds_codec->dev,
"Failed to disable regulator \"vcc\": %d\n", ret);
}
static const struct drm_bridge_funcs funcs = {
.attach = lvds_codec_attach,
.enable = lvds_codec_enable,
.disable = lvds_codec_disable,
};
#define MAX_INPUT_SEL_FORMATS 1
static u32 *
lvds_codec_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state,
u32 output_fmt,
unsigned int *num_input_fmts)
{
struct lvds_codec *lvds_codec = to_lvds_codec(bridge);
u32 *input_fmts;
*num_input_fmts = 0;
input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
GFP_KERNEL);
if (!input_fmts)
return NULL;
input_fmts[0] = lvds_codec->bus_format;
*num_input_fmts = MAX_INPUT_SEL_FORMATS;
return input_fmts;
}
static const struct drm_bridge_funcs funcs_decoder = {
.attach = lvds_codec_attach,
.enable = lvds_codec_enable,
.disable = lvds_codec_disable,
.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
.atomic_reset = drm_atomic_helper_bridge_reset,
.atomic_get_input_bus_fmts = lvds_codec_atomic_get_input_bus_fmts,
};
static int lvds_codec_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *panel_node;
struct device_node *bus_node;
struct drm_panel *panel;
struct lvds_codec *lvds_codec;
u32 val;
int ret;
lvds_codec = devm_kzalloc(dev, sizeof(*lvds_codec), GFP_KERNEL);
if (!lvds_codec)
return -ENOMEM;
lvds_codec->dev = &pdev->dev;
lvds_codec->connector_type = (uintptr_t)of_device_get_match_data(dev);
lvds_codec->vcc = devm_regulator_get(lvds_codec->dev, "power");
if (IS_ERR(lvds_codec->vcc))
return dev_err_probe(dev, PTR_ERR(lvds_codec->vcc),
"Unable to get \"vcc\" supply\n");
lvds_codec->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown",
GPIOD_OUT_HIGH);
if (IS_ERR(lvds_codec->powerdown_gpio))
return dev_err_probe(dev, PTR_ERR(lvds_codec->powerdown_gpio),
"powerdown GPIO failure\n");
/* Locate the panel DT node. */
panel_node = of_graph_get_remote_node(dev->of_node, 1, 0);
if (!panel_node) {
dev_dbg(dev, "panel DT node not found\n");
return -ENXIO;
}
panel = of_drm_find_panel(panel_node);
of_node_put(panel_node);
if (IS_ERR(panel)) {
dev_dbg(dev, "panel not found, deferring probe\n");
return PTR_ERR(panel);
}
lvds_codec->panel_bridge =
devm_drm_panel_bridge_add_typed(dev, panel,
lvds_codec->connector_type);
if (IS_ERR(lvds_codec->panel_bridge))
return PTR_ERR(lvds_codec->panel_bridge);
lvds_codec->bridge.funcs = &funcs;
/*
* Decoder input LVDS format is a property of the decoder chip or even
* its strapping. Handle data-mapping the same way lvds-panel does. In
* case data-mapping is not present, do nothing, since there are still
* legacy bindings which do not specify this property.
*/
if (lvds_codec->connector_type != DRM_MODE_CONNECTOR_LVDS) {
bus_node = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0);
if (!bus_node) {
dev_dbg(dev, "bus DT node not found\n");
return -ENXIO;
}
ret = drm_of_lvds_get_data_mapping(bus_node);
of_node_put(bus_node);
if (ret == -ENODEV) {
dev_warn(dev, "missing 'data-mapping' DT property\n");
} else if (ret) {
dev_err(dev, "invalid 'data-mapping' DT property\n");
return ret;
} else {
lvds_codec->bus_format = ret;
lvds_codec->bridge.funcs = &funcs_decoder;
}
}
/*
* Encoder might sample data on different clock edge than the display,
* for example OnSemi FIN3385 has a dedicated strapping pin to select
* the sampling edge.
*/
if (lvds_codec->connector_type == DRM_MODE_CONNECTOR_LVDS &&
!of_property_read_u32(dev->of_node, "pclk-sample", &val)) {
lvds_codec->timings.input_bus_flags = val ?
DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE :
DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
}
/*
* The panel_bridge bridge is attached to the panel's of_node,
* but we need a bridge attached to our of_node for our user
* to look up.
*/
lvds_codec->bridge.of_node = dev->of_node;
lvds_codec->bridge.timings = &lvds_codec->timings;
drm_bridge_add(&lvds_codec->bridge);
platform_set_drvdata(pdev, lvds_codec);
return 0;
}
static int lvds_codec_remove(struct platform_device *pdev)
{
struct lvds_codec *lvds_codec = platform_get_drvdata(pdev);
drm_bridge_remove(&lvds_codec->bridge);
return 0;
}
static const struct of_device_id lvds_codec_match[] = {
{
.compatible = "lvds-decoder",
.data = (void *)DRM_MODE_CONNECTOR_DPI,
},
{
.compatible = "lvds-encoder",
.data = (void *)DRM_MODE_CONNECTOR_LVDS,
},
{
.compatible = "thine,thc63lvdm83d",
.data = (void *)DRM_MODE_CONNECTOR_LVDS,
},
{},
};
MODULE_DEVICE_TABLE(of, lvds_codec_match);
static struct platform_driver lvds_codec_driver = {
.probe = lvds_codec_probe,
.remove = lvds_codec_remove,
.driver = {
.name = "lvds-codec",
.of_match_table = lvds_codec_match,
},
};
module_platform_driver(lvds_codec_driver);
MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
MODULE_DESCRIPTION("LVDS encoders and decoders");
MODULE_LICENSE("GPL");
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