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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2015 Texas Instruments4 * Author: Jyri Sarha <jsarha@ti.com>5 */6 7#include <linux/component.h>8#include <linux/of_graph.h>9 10#include <drm/drm_atomic_helper.h>11#include <drm/drm_bridge.h>12#include <drm/drm_of.h>13#include <drm/drm_simple_kms_helper.h>14 15#include "tilcdc_drv.h"16#include "tilcdc_external.h"17 18static const struct tilcdc_panel_info panel_info_tda998x = {19 .ac_bias = 255,20 .ac_bias_intrpt = 0,21 .dma_burst_sz = 16,22 .bpp = 16,23 .fdd = 0x80,24 .tft_alt_mode = 0,25 .invert_pxl_clk = 1,26 .sync_edge = 1,27 .sync_ctrl = 1,28 .raster_order = 0,29};30 31static const struct tilcdc_panel_info panel_info_default = {32 .ac_bias = 255,33 .ac_bias_intrpt = 0,34 .dma_burst_sz = 16,35 .bpp = 16,36 .fdd = 0x80,37 .tft_alt_mode = 0,38 .sync_edge = 0,39 .sync_ctrl = 1,40 .raster_order = 0,41};42 43static44struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev,45 struct drm_encoder *encoder)46{47 struct drm_connector *connector;48 49 list_for_each_entry(connector, &ddev->mode_config.connector_list, head) {50 if (drm_connector_has_possible_encoder(connector, encoder))51 return connector;52 }53 54 dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",55 encoder->name, encoder->base.id);56 57 return NULL;58}59 60int tilcdc_add_component_encoder(struct drm_device *ddev)61{62 struct tilcdc_drm_private *priv = ddev->dev_private;63 struct drm_encoder *encoder = NULL, *iter;64 65 list_for_each_entry(iter, &ddev->mode_config.encoder_list, head)66 if (iter->possible_crtcs & (1 << priv->crtc->index)) {67 encoder = iter;68 break;69 }70 71 if (!encoder) {72 dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);73 return -ENODEV;74 }75 76 priv->external_connector =77 tilcdc_encoder_find_connector(ddev, encoder);78 79 if (!priv->external_connector)80 return -ENODEV;81 82 /* Only tda998x is supported at the moment. */83 tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);84 tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);85 86 return 0;87}88 89static90int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)91{92 struct tilcdc_drm_private *priv = ddev->dev_private;93 int ret;94 95 priv->external_encoder->possible_crtcs = BIT(0);96 97 ret = drm_bridge_attach(priv->external_encoder, bridge, NULL, 0);98 if (ret)99 return ret;100 101 tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);102 103 priv->external_connector =104 tilcdc_encoder_find_connector(ddev, priv->external_encoder);105 if (!priv->external_connector)106 return -ENODEV;107 108 return 0;109}110 111int tilcdc_attach_external_device(struct drm_device *ddev)112{113 struct tilcdc_drm_private *priv = ddev->dev_private;114 struct drm_bridge *bridge;115 struct drm_panel *panel;116 int ret;117 118 ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,119 &panel, &bridge);120 if (ret == -ENODEV)121 return 0;122 else if (ret)123 return ret;124 125 priv->external_encoder = devm_kzalloc(ddev->dev,126 sizeof(*priv->external_encoder),127 GFP_KERNEL);128 if (!priv->external_encoder)129 return -ENOMEM;130 131 ret = drm_simple_encoder_init(ddev, priv->external_encoder,132 DRM_MODE_ENCODER_NONE);133 if (ret) {134 dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);135 return ret;136 }137 138 if (panel) {139 bridge = devm_drm_panel_bridge_add_typed(ddev->dev, panel,140 DRM_MODE_CONNECTOR_DPI);141 if (IS_ERR(bridge)) {142 ret = PTR_ERR(bridge);143 goto err_encoder_cleanup;144 }145 }146 147 ret = tilcdc_attach_bridge(ddev, bridge);148 if (ret)149 goto err_encoder_cleanup;150 151 return 0;152 153err_encoder_cleanup:154 drm_encoder_cleanup(priv->external_encoder);155 return ret;156}157 158static int dev_match_of(struct device *dev, void *data)159{160 return dev->of_node == data;161}162 163int tilcdc_get_external_components(struct device *dev,164 struct component_match **match)165{166 struct device_node *node;167 168 node = of_graph_get_remote_node(dev->of_node, 0, 0);169 170 if (!of_device_is_compatible(node, "nxp,tda998x")) {171 of_node_put(node);172 return 0;173 }174 175 if (match)176 drm_of_component_match_add(dev, match, dev_match_of, node);177 of_node_put(node);178 return 1;179}180