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