1 // SPDX-License-Identifier: MIT 2 3 #include <drm/drm_atomic_state_helper.h> 4 #include <drm/drm_edid.h> 5 #include <drm/drm_modeset_helper_vtables.h> 6 #include <drm/drm_print.h> 7 #include <drm/drm_probe_helper.h> 8 9 #include "ast_ddc.h" 10 #include "ast_drv.h" 11 12 /* 13 * Encoder 14 */ 15 16 static const struct drm_encoder_funcs ast_vga_encoder_funcs = { 17 .destroy = drm_encoder_cleanup, 18 }; 19 20 /* 21 * Connector 22 */ 23 24 static int ast_vga_connector_helper_get_modes(struct drm_connector *connector) 25 { 26 struct ast_connector *ast_connector = to_ast_connector(connector); 27 int count; 28 29 if (ast_connector->physical_status == connector_status_connected) { 30 count = drm_connector_helper_get_modes(connector); 31 } else { 32 drm_edid_connector_update(connector, NULL); 33 34 /* 35 * There's no EDID data without a connected monitor. Set BMC- 36 * compatible modes in this case. The XGA default resolution 37 * should work well for all BMCs. 38 */ 39 count = drm_add_modes_noedid(connector, 4096, 4096); 40 if (count) 41 drm_set_preferred_mode(connector, 1024, 768); 42 } 43 44 return count; 45 } 46 47 static int ast_vga_connector_helper_detect_ctx(struct drm_connector *connector, 48 struct drm_modeset_acquire_ctx *ctx, 49 bool force) 50 { 51 struct ast_connector *ast_connector = to_ast_connector(connector); 52 enum drm_connector_status status; 53 54 status = drm_connector_helper_detect_from_ddc(connector, ctx, force); 55 56 if (status != ast_connector->physical_status) 57 ++connector->epoch_counter; 58 ast_connector->physical_status = status; 59 60 return connector_status_connected; 61 } 62 63 static const struct drm_connector_helper_funcs ast_vga_connector_helper_funcs = { 64 .get_modes = ast_vga_connector_helper_get_modes, 65 .detect_ctx = ast_vga_connector_helper_detect_ctx, 66 }; 67 68 static const struct drm_connector_funcs ast_vga_connector_funcs = { 69 .reset = drm_atomic_helper_connector_reset, 70 .fill_modes = drm_helper_probe_single_connector_modes, 71 .destroy = drm_connector_cleanup, 72 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 73 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 74 }; 75 76 static int ast_vga_connector_init(struct drm_device *dev, struct drm_connector *connector) 77 { 78 struct ast_device *ast = to_ast_device(dev); 79 struct i2c_adapter *ddc; 80 int ret; 81 82 ddc = ast_ddc_create(ast); 83 if (IS_ERR(ddc)) { 84 ret = PTR_ERR(ddc); 85 drm_err(dev, "failed to add DDC bus for connector; ret=%d\n", ret); 86 return ret; 87 } 88 89 ret = drm_connector_init_with_ddc(dev, connector, &ast_vga_connector_funcs, 90 DRM_MODE_CONNECTOR_VGA, ddc); 91 if (ret) 92 return ret; 93 94 drm_connector_helper_add(connector, &ast_vga_connector_helper_funcs); 95 96 connector->interlace_allowed = 0; 97 connector->doublescan_allowed = 0; 98 99 connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT; 100 101 return 0; 102 } 103 104 int ast_vga_output_init(struct ast_device *ast) 105 { 106 struct drm_device *dev = &ast->base; 107 struct drm_crtc *crtc = &ast->crtc; 108 struct drm_encoder *encoder = &ast->output.vga.encoder; 109 struct ast_connector *ast_connector = &ast->output.vga.connector; 110 struct drm_connector *connector = &ast_connector->base; 111 int ret; 112 113 ret = drm_encoder_init(dev, encoder, &ast_vga_encoder_funcs, 114 DRM_MODE_ENCODER_DAC, NULL); 115 if (ret) 116 return ret; 117 encoder->possible_crtcs = drm_crtc_mask(crtc); 118 119 ret = ast_vga_connector_init(dev, connector); 120 if (ret) 121 return ret; 122 ast_connector->physical_status = connector->status; 123 124 ret = drm_connector_attach_encoder(connector, encoder); 125 if (ret) 126 return ret; 127 128 return 0; 129 } 130