1 /* 2 * drivers/gpu/drm/omapdrm/omap_encoder.c 3 * 4 * Copyright (C) 2011 Texas Instruments 5 * Author: Rob Clark <rob@ti.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 as published by 9 * the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "omap_drv.h" 21 22 #include "drm_crtc.h" 23 #include "drm_crtc_helper.h" 24 25 #include <linux/list.h> 26 27 28 /* 29 * encoder funcs 30 */ 31 32 #define to_omap_encoder(x) container_of(x, struct omap_encoder, base) 33 34 /* The encoder and connector both map to same dssdev.. the encoder 35 * handles the 'active' parts, ie. anything the modifies the state 36 * of the hw, and the connector handles the 'read-only' parts, like 37 * detecting connection and reading edid. 38 */ 39 struct omap_encoder { 40 struct drm_encoder base; 41 struct omap_dss_device *dssdev; 42 }; 43 44 struct omap_dss_device *omap_encoder_get_dssdev(struct drm_encoder *encoder) 45 { 46 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 47 48 return omap_encoder->dssdev; 49 } 50 51 static void omap_encoder_destroy(struct drm_encoder *encoder) 52 { 53 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 54 55 omap_encoder_set_enabled(encoder, false); 56 57 drm_encoder_cleanup(encoder); 58 kfree(omap_encoder); 59 } 60 61 static const struct drm_encoder_funcs omap_encoder_funcs = { 62 .destroy = omap_encoder_destroy, 63 }; 64 65 /* 66 * The CRTC drm_crtc_helper_set_mode() doesn't really give us the right 67 * order.. the easiest way to work around this for now is to make all 68 * the encoder-helper's no-op's and have the omap_crtc code take care 69 * of the sequencing and call us in the right points. 70 * 71 * Eventually to handle connecting CRTCs to different encoders properly, 72 * either the CRTC helpers need to change or we need to replace 73 * drm_crtc_helper_set_mode(), but lets wait until atomic-modeset for 74 * that. 75 */ 76 77 static void omap_encoder_dpms(struct drm_encoder *encoder, int mode) 78 { 79 } 80 81 static bool omap_encoder_mode_fixup(struct drm_encoder *encoder, 82 const struct drm_display_mode *mode, 83 struct drm_display_mode *adjusted_mode) 84 { 85 return true; 86 } 87 88 static void omap_encoder_mode_set(struct drm_encoder *encoder, 89 struct drm_display_mode *mode, 90 struct drm_display_mode *adjusted_mode) 91 { 92 } 93 94 static void omap_encoder_prepare(struct drm_encoder *encoder) 95 { 96 } 97 98 static void omap_encoder_commit(struct drm_encoder *encoder) 99 { 100 } 101 102 static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = { 103 .dpms = omap_encoder_dpms, 104 .mode_fixup = omap_encoder_mode_fixup, 105 .mode_set = omap_encoder_mode_set, 106 .prepare = omap_encoder_prepare, 107 .commit = omap_encoder_commit, 108 }; 109 110 /* 111 * Instead of relying on the helpers for modeset, the omap_crtc code 112 * calls these functions in the proper sequence. 113 */ 114 115 int omap_encoder_set_enabled(struct drm_encoder *encoder, bool enabled) 116 { 117 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 118 struct omap_dss_device *dssdev = omap_encoder->dssdev; 119 struct omap_dss_driver *dssdrv = dssdev->driver; 120 121 if (enabled) { 122 return dssdrv->enable(dssdev); 123 } else { 124 dssdrv->disable(dssdev); 125 return 0; 126 } 127 } 128 129 int omap_encoder_update(struct drm_encoder *encoder, 130 struct omap_overlay_manager *mgr, 131 struct omap_video_timings *timings) 132 { 133 struct drm_device *dev = encoder->dev; 134 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 135 struct omap_dss_device *dssdev = omap_encoder->dssdev; 136 struct omap_dss_driver *dssdrv = dssdev->driver; 137 int ret; 138 139 dssdev->src->manager = mgr; 140 141 if (dssdrv->check_timings) { 142 ret = dssdrv->check_timings(dssdev, timings); 143 } else { 144 struct omap_video_timings t = {0}; 145 146 dssdrv->get_timings(dssdev, &t); 147 148 if (memcmp(timings, &t, sizeof(struct omap_video_timings))) 149 ret = -EINVAL; 150 else 151 ret = 0; 152 } 153 154 if (ret) { 155 dev_err(dev->dev, "could not set timings: %d\n", ret); 156 return ret; 157 } 158 159 if (dssdrv->set_timings) 160 dssdrv->set_timings(dssdev, timings); 161 162 return 0; 163 } 164 165 /* initialize encoder */ 166 struct drm_encoder *omap_encoder_init(struct drm_device *dev, 167 struct omap_dss_device *dssdev) 168 { 169 struct drm_encoder *encoder = NULL; 170 struct omap_encoder *omap_encoder; 171 172 omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL); 173 if (!omap_encoder) 174 goto fail; 175 176 omap_encoder->dssdev = dssdev; 177 178 encoder = &omap_encoder->base; 179 180 drm_encoder_init(dev, encoder, &omap_encoder_funcs, 181 DRM_MODE_ENCODER_TMDS); 182 drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs); 183 184 return encoder; 185 186 fail: 187 if (encoder) 188 omap_encoder_destroy(encoder); 189 190 return NULL; 191 } 192