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_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 21 int 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 41 static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector) 42 { 43 drm_connector_unregister(connector); 44 drm_connector_cleanup(connector); 45 } 46 47 static 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 55 static 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 63 static enum drm_mode_status 64 fsl_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 73 static 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 78 static 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; 103 104 err_sysfs: 105 drm_connector_unregister(connector); 106 err_cleanup: 107 drm_connector_cleanup(connector); 108 return ret; 109 } 110 111 int 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