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
  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 }