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 /* 33 * There's no EDID data without a connected monitor. Set BMC- 34 * compatible modes in this case. The XGA default resolution 35 * should work well for all BMCs. 36 */ 37 count = drm_add_modes_noedid(connector, 4096, 4096); 38 if (count) 39 drm_set_preferred_mode(connector, 1024, 768); 40 } 41 42 return count; 43 } 44 45 static int ast_vga_connector_helper_detect_ctx(struct drm_connector *connector, 46 struct drm_modeset_acquire_ctx *ctx, 47 bool force) 48 { 49 struct ast_connector *ast_connector = to_ast_connector(connector); 50 enum drm_connector_status status; 51 52 status = drm_connector_helper_detect_from_ddc(connector, ctx, force); 53 54 if (status != ast_connector->physical_status) 55 ++connector->epoch_counter; 56 ast_connector->physical_status = status; 57 58 return connector_status_connected; 59 } 60 61 static const struct drm_connector_helper_funcs ast_vga_connector_helper_funcs = { 62 .get_modes = ast_vga_connector_helper_get_modes, 63 .detect_ctx = ast_vga_connector_helper_detect_ctx, 64 }; 65 66 static const struct drm_connector_funcs ast_vga_connector_funcs = { 67 .reset = drm_atomic_helper_connector_reset, 68 .fill_modes = drm_helper_probe_single_connector_modes, 69 .destroy = drm_connector_cleanup, 70 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 71 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 72 }; 73 74 static int ast_vga_connector_init(struct drm_device *dev, struct drm_connector *connector) 75 { 76 struct ast_device *ast = to_ast_device(dev); 77 struct i2c_adapter *ddc; 78 int ret; 79 80 ddc = ast_ddc_create(ast); 81 if (IS_ERR(ddc)) { 82 ret = PTR_ERR(ddc); 83 drm_err(dev, "failed to add DDC bus for connector; ret=%d\n", ret); 84 return ret; 85 } 86 87 ret = drm_connector_init_with_ddc(dev, connector, &ast_vga_connector_funcs, 88 DRM_MODE_CONNECTOR_VGA, ddc); 89 if (ret) 90 return ret; 91 92 drm_connector_helper_add(connector, &ast_vga_connector_helper_funcs); 93 94 connector->interlace_allowed = 0; 95 connector->doublescan_allowed = 0; 96 97 connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT; 98 99 return 0; 100 } 101 102 int ast_vga_output_init(struct ast_device *ast) 103 { 104 struct drm_device *dev = &ast->base; 105 struct drm_crtc *crtc = &ast->crtc; 106 struct drm_encoder *encoder = &ast->output.vga.encoder; 107 struct ast_connector *ast_connector = &ast->output.vga.connector; 108 struct drm_connector *connector = &ast_connector->base; 109 int ret; 110 111 ret = drm_encoder_init(dev, encoder, &ast_vga_encoder_funcs, 112 DRM_MODE_ENCODER_DAC, NULL); 113 if (ret) 114 return ret; 115 encoder->possible_crtcs = drm_crtc_mask(crtc); 116 117 ret = ast_vga_connector_init(dev, connector); 118 if (ret) 119 return ret; 120 ast_connector->physical_status = connector->status; 121 122 ret = drm_connector_attach_encoder(connector, encoder); 123 if (ret) 124 return ret; 125 126 return 0; 127 } 128