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2ae6ab9
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linux
/
drivers
/
gpu
/
drm
/
bridge
/
lvds-codec.c
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256 lines (216 loc) · 6.89 KB
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linux
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drivers
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gpu
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drm
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bridge
/
lvds-codec.c
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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 < 0) { 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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