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 drm_encoder_cleanup(encoder); 55 kfree(omap_encoder); 56 } 57 58 static const struct drm_encoder_funcs omap_encoder_funcs = { 59 .destroy = omap_encoder_destroy, 60 }; 61 62 /* 63 * The CRTC drm_crtc_helper_set_mode() doesn't really give us the right 64 * order.. the easiest way to work around this for now is to make all 65 * the encoder-helper's no-op's and have the omap_crtc code take care 66 * of the sequencing and call us in the right points. 67 * 68 * Eventually to handle connecting CRTCs to different encoders properly, 69 * either the CRTC helpers need to change or we need to replace 70 * drm_crtc_helper_set_mode(), but lets wait until atomic-modeset for 71 * that. 72 */ 73 74 static void omap_encoder_dpms(struct drm_encoder *encoder, int mode) 75 { 76 } 77 78 static bool omap_encoder_mode_fixup(struct drm_encoder *encoder, 79 const struct drm_display_mode *mode, 80 struct drm_display_mode *adjusted_mode) 81 { 82 return true; 83 } 84 85 static void omap_encoder_mode_set(struct drm_encoder *encoder, 86 struct drm_display_mode *mode, 87 struct drm_display_mode *adjusted_mode) 88 { 89 } 90 91 static void omap_encoder_prepare(struct drm_encoder *encoder) 92 { 93 } 94 95 static void omap_encoder_commit(struct drm_encoder *encoder) 96 { 97 } 98 99 static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = { 100 .dpms = omap_encoder_dpms, 101 .mode_fixup = omap_encoder_mode_fixup, 102 .mode_set = omap_encoder_mode_set, 103 .prepare = omap_encoder_prepare, 104 .commit = omap_encoder_commit, 105 }; 106 107 /* 108 * Instead of relying on the helpers for modeset, the omap_crtc code 109 * calls these functions in the proper sequence. 110 */ 111 112 int omap_encoder_set_enabled(struct drm_encoder *encoder, bool enabled) 113 { 114 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 115 struct omap_dss_device *dssdev = omap_encoder->dssdev; 116 struct omap_dss_driver *dssdrv = dssdev->driver; 117 118 if (enabled) { 119 return dssdrv->enable(dssdev); 120 } else { 121 dssdrv->disable(dssdev); 122 return 0; 123 } 124 } 125 126 int omap_encoder_update(struct drm_encoder *encoder, 127 struct omap_overlay_manager *mgr, 128 struct omap_video_timings *timings) 129 { 130 struct drm_device *dev = encoder->dev; 131 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 132 struct omap_dss_device *dssdev = omap_encoder->dssdev; 133 struct omap_dss_driver *dssdrv = dssdev->driver; 134 int ret; 135 136 dssdev->src->manager = mgr; 137 138 if (dssdrv->check_timings) { 139 ret = dssdrv->check_timings(dssdev, timings); 140 } else { 141 struct omap_video_timings t = {0}; 142 143 dssdrv->get_timings(dssdev, &t); 144 145 if (memcmp(timings, &t, sizeof(struct omap_video_timings))) 146 ret = -EINVAL; 147 else 148 ret = 0; 149 } 150 151 if (ret) { 152 dev_err(dev->dev, "could not set timings: %d\n", ret); 153 return ret; 154 } 155 156 if (dssdrv->set_timings) 157 dssdrv->set_timings(dssdev, timings); 158 159 return 0; 160 } 161 162 /* initialize encoder */ 163 struct drm_encoder *omap_encoder_init(struct drm_device *dev, 164 struct omap_dss_device *dssdev) 165 { 166 struct drm_encoder *encoder = NULL; 167 struct omap_encoder *omap_encoder; 168 169 omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL); 170 if (!omap_encoder) 171 goto fail; 172 173 omap_encoder->dssdev = dssdev; 174 175 encoder = &omap_encoder->base; 176 177 drm_encoder_init(dev, encoder, &omap_encoder_funcs, 178 DRM_MODE_ENCODER_TMDS); 179 drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs); 180 181 return encoder; 182 183 fail: 184 if (encoder) 185 omap_encoder_destroy(encoder); 186 187 return NULL; 188 } 189