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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright 2015 Freescale Semiconductor, Inc.4 *5 * Freescale DCU drm device driver6 */7 8#include <linux/backlight.h>9#include <linux/of_graph.h>10 11#include <drm/drm_atomic_helper.h>12#include <drm/drm_bridge.h>13#include <drm/drm_of.h>14#include <drm/drm_panel.h>15#include <drm/drm_probe_helper.h>16#include <drm/drm_simple_kms_helper.h>17 18#include "fsl_dcu_drm_drv.h"19#include "fsl_tcon.h"20 21int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,22 struct drm_crtc *crtc)23{24 struct drm_encoder *encoder = &fsl_dev->encoder;25 int ret;26 27 encoder->possible_crtcs = 1;28 29 /* Use bypass mode for parallel RGB/LVDS encoder */30 if (fsl_dev->tcon)31 fsl_tcon_bypass_enable(fsl_dev->tcon);32 33 ret = drm_simple_encoder_init(fsl_dev->drm, encoder,34 DRM_MODE_ENCODER_LVDS);35 if (ret < 0)36 return ret;37 38 return 0;39}40 41static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)42{43 drm_connector_unregister(connector);44 drm_connector_cleanup(connector);45}46 47static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {48 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,49 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,50 .destroy = fsl_dcu_drm_connector_destroy,51 .fill_modes = drm_helper_probe_single_connector_modes,52 .reset = drm_atomic_helper_connector_reset,53};54 55static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)56{57 struct fsl_dcu_drm_connector *fsl_connector;58 59 fsl_connector = to_fsl_dcu_connector(connector);60 return drm_panel_get_modes(fsl_connector->panel, connector);61}62 63static enum drm_mode_status64fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,65 struct drm_display_mode *mode)66{67 if (mode->hdisplay & 0xf)68 return MODE_ERROR;69 70 return MODE_OK;71}72 73static const struct drm_connector_helper_funcs connector_helper_funcs = {74 .get_modes = fsl_dcu_drm_connector_get_modes,75 .mode_valid = fsl_dcu_drm_connector_mode_valid,76};77 78static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,79 struct drm_panel *panel)80{81 struct drm_encoder *encoder = &fsl_dev->encoder;82 struct drm_connector *connector = &fsl_dev->connector.base;83 int ret;84 85 fsl_dev->connector.encoder = encoder;86 87 ret = drm_connector_init(fsl_dev->drm, connector,88 &fsl_dcu_drm_connector_funcs,89 DRM_MODE_CONNECTOR_LVDS);90 if (ret < 0)91 return ret;92 93 drm_connector_helper_add(connector, &connector_helper_funcs);94 ret = drm_connector_register(connector);95 if (ret < 0)96 goto err_cleanup;97 98 ret = drm_connector_attach_encoder(connector, encoder);99 if (ret < 0)100 goto err_sysfs;101 102 return 0;103 104err_sysfs:105 drm_connector_unregister(connector);106err_cleanup:107 drm_connector_cleanup(connector);108 return ret;109}110 111int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)112{113 struct device_node *panel_node;114 struct drm_panel *panel;115 struct drm_bridge *bridge;116 int ret;117 118 /* This is for backward compatibility */119 panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);120 if (panel_node) {121 fsl_dev->connector.panel = of_drm_find_panel(panel_node);122 of_node_put(panel_node);123 if (IS_ERR(fsl_dev->connector.panel))124 return PTR_ERR(fsl_dev->connector.panel);125 126 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);127 }128 129 ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);130 if (ret)131 return ret;132 133 if (panel) {134 fsl_dev->connector.panel = panel;135 return fsl_dcu_attach_panel(fsl_dev, panel);136 }137 138 return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL, 0);139}140