drivers/gpu/drm/omapdrm/omap_encoder.c

   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 }