1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright 2015 Freescale Semiconductor, Inc. 4 * 5 * Freescale DCU drm device driver 6 */ 7 8 #include <linux/backlight.h> 9 #include <linux/of.h> 10 #include <linux/of_graph.h> 11 12 #include <drm/drm_atomic_helper.h> 13 #include <drm/drm_bridge.h> 14 #include <drm/drm_of.h> 15 #include <drm/drm_panel.h> 16 #include <drm/drm_probe_helper.h> 17 #include <drm/drm_simple_kms_helper.h> 18 19 #include "fsl_dcu_drm_drv.h" 20 #include "fsl_tcon.h" 21 22 int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev, 23 struct drm_crtc *crtc) 24 { 25 struct drm_encoder *encoder = &fsl_dev->encoder; 26 int ret; 27 28 encoder->possible_crtcs = 1; 29 30 /* Use bypass mode for parallel RGB/LVDS encoder */ 31 if (fsl_dev->tcon) 32 fsl_tcon_bypass_enable(fsl_dev->tcon); 33 34 ret = drm_simple_encoder_init(fsl_dev->drm, encoder, 35 DRM_MODE_ENCODER_LVDS); 36 if (ret < 0) 37 return ret; 38 39 return 0; 40 } 41 42 static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector) 43 { 44 drm_connector_unregister(connector); 45 drm_connector_cleanup(connector); 46 } 47 48 static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = { 49 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 50 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 51 .destroy = fsl_dcu_drm_connector_destroy, 52 .fill_modes = drm_helper_probe_single_connector_modes, 53 .reset = drm_atomic_helper_connector_reset, 54 }; 55 56 static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector) 57 { 58 struct fsl_dcu_drm_connector *fsl_connector; 59 60 fsl_connector = to_fsl_dcu_connector(connector); 61 return drm_panel_get_modes(fsl_connector->panel, connector); 62 } 63 64 static enum drm_mode_status 65 fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector, 66 const struct drm_display_mode *mode) 67 { 68 if (mode->hdisplay & 0xf) 69 return MODE_ERROR; 70 71 return MODE_OK; 72 } 73 74 static const struct drm_connector_helper_funcs connector_helper_funcs = { 75 .get_modes = fsl_dcu_drm_connector_get_modes, 76 .mode_valid = fsl_dcu_drm_connector_mode_valid, 77 }; 78 79 static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev, 80 struct drm_panel *panel) 81 { 82 struct drm_encoder *encoder = &fsl_dev->encoder; 83 struct drm_connector *connector = &fsl_dev->connector.base; 84 int ret; 85 86 fsl_dev->connector.encoder = encoder; 87 88 ret = drm_connector_init(fsl_dev->drm, connector, 89 &fsl_dcu_drm_connector_funcs, 90 DRM_MODE_CONNECTOR_LVDS); 91 if (ret < 0) 92 return ret; 93 94 drm_connector_helper_add(connector, &connector_helper_funcs); 95 ret = drm_connector_register(connector); 96 if (ret < 0) 97 goto err_cleanup; 98 99 ret = drm_connector_attach_encoder(connector, encoder); 100 if (ret < 0) 101 goto err_sysfs; 102 103 return 0; 104 105 err_sysfs: 106 drm_connector_unregister(connector); 107 err_cleanup: 108 drm_connector_cleanup(connector); 109 return ret; 110 } 111 112 int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev) 113 { 114 struct device_node *panel_node; 115 struct drm_panel *panel; 116 struct drm_bridge *bridge; 117 int ret; 118 119 /* This is for backward compatibility */ 120 panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0); 121 if (panel_node) { 122 fsl_dev->connector.panel = of_drm_find_panel(panel_node); 123 of_node_put(panel_node); 124 if (IS_ERR(fsl_dev->connector.panel)) 125 return PTR_ERR(fsl_dev->connector.panel); 126 127 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel); 128 } 129 130 ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge); 131 if (ret) 132 return ret; 133 134 if (panel) { 135 fsl_dev->connector.panel = panel; 136 return fsl_dcu_attach_panel(fsl_dev, panel); 137 } 138 139 return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL, 0); 140 } 141