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 static void omap_encoder_destroy(struct drm_encoder *encoder) 45 { 46 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 47 drm_encoder_cleanup(encoder); 48 kfree(omap_encoder); 49 } 50 51 static const struct drm_encoder_funcs omap_encoder_funcs = { 52 .destroy = omap_encoder_destroy, 53 }; 54 55 /* 56 * The CRTC drm_crtc_helper_set_mode() doesn't really give us the right 57 * order.. the easiest way to work around this for now is to make all 58 * the encoder-helper's no-op's and have the omap_crtc code take care 59 * of the sequencing and call us in the right points. 60 * 61 * Eventually to handle connecting CRTCs to different encoders properly, 62 * either the CRTC helpers need to change or we need to replace 63 * drm_crtc_helper_set_mode(), but lets wait until atomic-modeset for 64 * that. 65 */ 66 67 static void omap_encoder_dpms(struct drm_encoder *encoder, int mode) 68 { 69 } 70 71 static bool omap_encoder_mode_fixup(struct drm_encoder *encoder, 72 const struct drm_display_mode *mode, 73 struct drm_display_mode *adjusted_mode) 74 { 75 return true; 76 } 77 78 static void omap_encoder_mode_set(struct drm_encoder *encoder, 79 struct drm_display_mode *mode, 80 struct drm_display_mode *adjusted_mode) 81 { 82 } 83 84 static void omap_encoder_prepare(struct drm_encoder *encoder) 85 { 86 } 87 88 static void omap_encoder_commit(struct drm_encoder *encoder) 89 { 90 } 91 92 static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = { 93 .dpms = omap_encoder_dpms, 94 .mode_fixup = omap_encoder_mode_fixup, 95 .mode_set = omap_encoder_mode_set, 96 .prepare = omap_encoder_prepare, 97 .commit = omap_encoder_commit, 98 }; 99 100 /* 101 * Instead of relying on the helpers for modeset, the omap_crtc code 102 * calls these functions in the proper sequence. 103 */ 104 105 int omap_encoder_set_enabled(struct drm_encoder *encoder, bool enabled) 106 { 107 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 108 struct omap_dss_device *dssdev = omap_encoder->dssdev; 109 struct omap_dss_driver *dssdrv = dssdev->driver; 110 111 if (enabled) { 112 return dssdrv->enable(dssdev); 113 } else { 114 dssdrv->disable(dssdev); 115 return 0; 116 } 117 } 118 119 int omap_encoder_update(struct drm_encoder *encoder, 120 struct omap_overlay_manager *mgr, 121 struct omap_video_timings *timings) 122 { 123 struct drm_device *dev = encoder->dev; 124 struct omap_encoder *omap_encoder = to_omap_encoder(encoder); 125 struct omap_dss_device *dssdev = omap_encoder->dssdev; 126 struct omap_dss_driver *dssdrv = dssdev->driver; 127 int ret; 128 129 dssdev->output->manager = mgr; 130 131 ret = dssdrv->check_timings(dssdev, timings); 132 if (ret) { 133 dev_err(dev->dev, "could not set timings: %d\n", ret); 134 return ret; 135 } 136 137 dssdrv->set_timings(dssdev, timings); 138 139 return 0; 140 } 141 142 /* initialize encoder */ 143 struct drm_encoder *omap_encoder_init(struct drm_device *dev, 144 struct omap_dss_device *dssdev) 145 { 146 struct drm_encoder *encoder = NULL; 147 struct omap_encoder *omap_encoder; 148 149 omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL); 150 if (!omap_encoder) 151 goto fail; 152 153 omap_encoder->dssdev = dssdev; 154 155 encoder = &omap_encoder->base; 156 157 drm_encoder_init(dev, encoder, &omap_encoder_funcs, 158 DRM_MODE_ENCODER_TMDS); 159 drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs); 160 161 return encoder; 162 163 fail: 164 if (encoder) 165 omap_encoder_destroy(encoder); 166 167 return NULL; 168 } 169