1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2017 Free Electrons 4 * Maxime Ripard <maxime.ripard@free-electrons.com> 5 */ 6 7 #include <linux/clk.h> 8 9 #include <drm/drm_atomic_helper.h> 10 #include <drm/drm_bridge.h> 11 #include <drm/drm_of.h> 12 #include <drm/drm_panel.h> 13 #include <drm/drm_print.h> 14 #include <drm/drm_probe_helper.h> 15 #include <drm/drm_simple_kms_helper.h> 16 17 #include "sun4i_crtc.h" 18 #include "sun4i_tcon.h" 19 #include "sun4i_lvds.h" 20 21 struct sun4i_lvds { 22 struct drm_connector connector; 23 struct drm_encoder encoder; 24 25 struct drm_panel *panel; 26 }; 27 28 static inline struct sun4i_lvds * 29 drm_connector_to_sun4i_lvds(struct drm_connector *connector) 30 { 31 return container_of(connector, struct sun4i_lvds, 32 connector); 33 } 34 35 static inline struct sun4i_lvds * 36 drm_encoder_to_sun4i_lvds(struct drm_encoder *encoder) 37 { 38 return container_of(encoder, struct sun4i_lvds, 39 encoder); 40 } 41 42 static int sun4i_lvds_get_modes(struct drm_connector *connector) 43 { 44 struct sun4i_lvds *lvds = 45 drm_connector_to_sun4i_lvds(connector); 46 47 return drm_panel_get_modes(lvds->panel, connector); 48 } 49 50 static const struct drm_connector_helper_funcs sun4i_lvds_con_helper_funcs = { 51 .get_modes = sun4i_lvds_get_modes, 52 }; 53 54 static void 55 sun4i_lvds_connector_destroy(struct drm_connector *connector) 56 { 57 drm_connector_cleanup(connector); 58 } 59 60 static const struct drm_connector_funcs sun4i_lvds_con_funcs = { 61 .fill_modes = drm_helper_probe_single_connector_modes, 62 .destroy = sun4i_lvds_connector_destroy, 63 .reset = drm_atomic_helper_connector_reset, 64 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 65 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 66 }; 67 68 static void sun4i_lvds_encoder_enable(struct drm_encoder *encoder) 69 { 70 struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(encoder); 71 72 DRM_DEBUG_DRIVER("Enabling LVDS output\n"); 73 74 if (lvds->panel) { 75 drm_panel_prepare(lvds->panel); 76 drm_panel_enable(lvds->panel); 77 } 78 } 79 80 static void sun4i_lvds_encoder_disable(struct drm_encoder *encoder) 81 { 82 struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(encoder); 83 84 DRM_DEBUG_DRIVER("Disabling LVDS output\n"); 85 86 if (lvds->panel) { 87 drm_panel_disable(lvds->panel); 88 drm_panel_unprepare(lvds->panel); 89 } 90 } 91 92 static const struct drm_encoder_helper_funcs sun4i_lvds_enc_helper_funcs = { 93 .disable = sun4i_lvds_encoder_disable, 94 .enable = sun4i_lvds_encoder_enable, 95 }; 96 97 int sun4i_lvds_init(struct drm_device *drm, struct sun4i_tcon *tcon) 98 { 99 struct drm_encoder *encoder; 100 struct drm_bridge *bridge; 101 struct sun4i_lvds *lvds; 102 int ret; 103 104 lvds = devm_kzalloc(drm->dev, sizeof(*lvds), GFP_KERNEL); 105 if (!lvds) 106 return -ENOMEM; 107 encoder = &lvds->encoder; 108 109 ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0, 110 &lvds->panel, &bridge); 111 if (ret) { 112 dev_info(drm->dev, "No panel or bridge found... LVDS output disabled\n"); 113 return 0; 114 } 115 116 drm_encoder_helper_add(&lvds->encoder, 117 &sun4i_lvds_enc_helper_funcs); 118 ret = drm_simple_encoder_init(drm, &lvds->encoder, 119 DRM_MODE_ENCODER_LVDS); 120 if (ret) { 121 dev_err(drm->dev, "Couldn't initialise the lvds encoder\n"); 122 goto err_out; 123 } 124 125 /* The LVDS encoder can only work with the TCON channel 0 */ 126 lvds->encoder.possible_crtcs = drm_crtc_mask(&tcon->crtc->crtc); 127 128 if (lvds->panel) { 129 drm_connector_helper_add(&lvds->connector, 130 &sun4i_lvds_con_helper_funcs); 131 ret = drm_connector_init(drm, &lvds->connector, 132 &sun4i_lvds_con_funcs, 133 DRM_MODE_CONNECTOR_LVDS); 134 if (ret) { 135 dev_err(drm->dev, "Couldn't initialise the lvds connector\n"); 136 goto err_cleanup_connector; 137 } 138 139 drm_connector_attach_encoder(&lvds->connector, 140 &lvds->encoder); 141 } 142 143 if (bridge) { 144 ret = drm_bridge_attach(encoder, bridge, NULL, 0); 145 if (ret) 146 goto err_cleanup_connector; 147 } 148 149 return 0; 150 151 err_cleanup_connector: 152 drm_encoder_cleanup(&lvds->encoder); 153 err_out: 154 return ret; 155 } 156 EXPORT_SYMBOL(sun4i_lvds_init); 157