1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/ 4 * Author: Rob Clark <rob@ti.com> 5 */ 6 7 #include <linux/list.h> 8 9 #include <drm/drm_bridge.h> 10 #include <drm/drm_crtc.h> 11 #include <drm/drm_modeset_helper_vtables.h> 12 #include <drm/drm_edid.h> 13 14 #include "omap_drv.h" 15 16 /* 17 * encoder funcs 18 */ 19 20 #define to_omap_encoder(x) container_of(x, struct omap_encoder, base) 21 22 /* The encoder and connector both map to same dssdev.. the encoder 23 * handles the 'active' parts, ie. anything the modifies the state 24 * of the hw, and the connector handles the 'read-only' parts, like 25 * detecting connection and reading edid. 26 */ 27 struct omap_encoder { 28 struct drm_encoder base; 29 struct omap_dss_device *output; 30 }; 31 32 static void omap_encoder_destroy(struct drm_encoder *encoder) 33 { 34 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 35 36 drm_encoder_cleanup(encoder); 37 kfree(omap_encoder); 38 } 39 40 static const struct drm_encoder_funcs omap_encoder_funcs = { 41 .destroy = omap_encoder_destroy, 42 }; 43 44 static void omap_encoder_update_videomode_flags(struct videomode *vm, 45 u32 bus_flags) 46 { 47 if (!(vm->flags & (DISPLAY_FLAGS_DE_LOW | 48 DISPLAY_FLAGS_DE_HIGH))) { 49 if (bus_flags & DRM_BUS_FLAG_DE_LOW) 50 vm->flags |= DISPLAY_FLAGS_DE_LOW; 51 else if (bus_flags & DRM_BUS_FLAG_DE_HIGH) 52 vm->flags |= DISPLAY_FLAGS_DE_HIGH; 53 } 54 55 if (!(vm->flags & (DISPLAY_FLAGS_PIXDATA_POSEDGE | 56 DISPLAY_FLAGS_PIXDATA_NEGEDGE))) { 57 if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE) 58 vm->flags |= DISPLAY_FLAGS_PIXDATA_POSEDGE; 59 else if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE) 60 vm->flags |= DISPLAY_FLAGS_PIXDATA_NEGEDGE; 61 } 62 63 if (!(vm->flags & (DISPLAY_FLAGS_SYNC_POSEDGE | 64 DISPLAY_FLAGS_SYNC_NEGEDGE))) { 65 if (bus_flags & DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE) 66 vm->flags |= DISPLAY_FLAGS_SYNC_POSEDGE; 67 else if (bus_flags & DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE) 68 vm->flags |= DISPLAY_FLAGS_SYNC_NEGEDGE; 69 } 70 } 71 72 static void omap_encoder_mode_set(struct drm_encoder *encoder, 73 struct drm_display_mode *mode, 74 struct drm_display_mode *adjusted_mode) 75 { 76 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 77 struct omap_dss_device *output = omap_encoder->output; 78 struct drm_device *dev = encoder->dev; 79 struct drm_connector *connector; 80 struct videomode vm = { 0 }; 81 u32 bus_flags; 82 83 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 84 if (connector->encoder == encoder) 85 break; 86 } 87 88 drm_display_mode_to_videomode(adjusted_mode, &vm); 89 90 /* 91 * HACK: This fixes the vm flags. 92 * struct drm_display_mode does not contain the VSYNC/HSYNC/DE flags and 93 * they get lost when converting back and forth between struct 94 * drm_display_mode and struct videomode. The hack below goes and 95 * fetches the missing flags. 96 * 97 * A better solution is to use DRM's bus-flags through the whole driver. 98 */ 99 drm_for_each_bridge_in_chain_from(output->bridge, bridge) { 100 if (!bridge->timings) 101 continue; 102 103 bus_flags = bridge->timings->input_bus_flags; 104 omap_encoder_update_videomode_flags(&vm, bus_flags); 105 } 106 107 bus_flags = connector->display_info.bus_flags; 108 omap_encoder_update_videomode_flags(&vm, bus_flags); 109 110 /* Set timings for all devices in the display pipeline. */ 111 dss_mgr_set_timings(output, &vm); 112 } 113 114 static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = { 115 .mode_set = omap_encoder_mode_set, 116 }; 117 118 /* initialize encoder */ 119 struct drm_encoder *omap_encoder_init(struct drm_device *dev, 120 struct omap_dss_device *output) 121 { 122 struct drm_encoder *encoder = NULL; 123 struct omap_encoder *omap_encoder; 124 125 omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL); 126 if (!omap_encoder) 127 goto fail; 128 129 omap_encoder->output = output; 130 131 encoder = &omap_encoder->base; 132 133 drm_encoder_init(dev, encoder, &omap_encoder_funcs, 134 DRM_MODE_ENCODER_TMDS, NULL); 135 drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs); 136 137 return encoder; 138 139 fail: 140 if (encoder) 141 omap_encoder_destroy(encoder); 142 143 return NULL; 144 } 145