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 <linux/list.h>
  21
  22 #include <drm/drm_crtc.h>
  23 #include <drm/drm_crtc_helper.h>
  24 #include <drm/drm_edid.h>
  25
  26 #include "omap_drv.h"
  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 static void omap_encoder_mode_set(struct drm_encoder *encoder,
  66                                 struct drm_display_mode *mode,
  67                                 struct drm_display_mode *adjusted_mode)
  68 {
  69         struct drm_device *dev = encoder->dev;
  70         struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
  71         struct omap_dss_device *dssdev = omap_encoder->dssdev;
  72         struct drm_connector *connector;
  73         bool hdmi_mode;
  74         int r;
  75
  76         hdmi_mode = false;
  77         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  78                 if (connector->encoder == encoder) {
  79                         hdmi_mode = omap_connector_get_hdmi_mode(connector);
  80                         break;
  81                 }
  82         }
  83
  84         if (dssdev->driver->set_hdmi_mode)
  85                 dssdev->driver->set_hdmi_mode(dssdev, hdmi_mode);
  86
  87         if (hdmi_mode && dssdev->driver->set_hdmi_infoframe) {
  88                 struct hdmi_avi_infoframe avi;
  89
  90                 r = drm_hdmi_avi_infoframe_from_display_mode(&avi, adjusted_mode);
  91                 if (r == 0)
  92                         dssdev->driver->set_hdmi_infoframe(dssdev, &avi);
  93         }
  94 }
  95
  96 /*
  97  * The CRTC drm_crtc_helper_set_mode() didn't really give us the right order.
  98  * The easiest way to work around this was to make all the encoder-helper's
  99  * no-op's and have the omap_crtc code take care of the sequencing and call
 100  * us in the right points.
 101  *
 102  * FIXME: Revisit this after switching to atomic updates completely.
 103  */
 104
 105 static void omap_encoder_disable(struct drm_encoder *encoder)
 106 {
 107 }
 108
 109 static void omap_encoder_enable(struct drm_encoder *encoder)
 110 {
 111 }
 112
 113 static int omap_encoder_atomic_check(struct drm_encoder *encoder,
 114                                      struct drm_crtc_state *crtc_state,
 115                                      struct drm_connector_state *conn_state)
 116 {
 117         return 0;
 118 }
 119
 120 static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = {
 121         .mode_set = omap_encoder_mode_set,
 122         .disable = omap_encoder_disable,
 123         .enable = omap_encoder_enable,
 124         .atomic_check = omap_encoder_atomic_check,
 125 };
 126
 127 /*
 128  * Instead of relying on the helpers for modeset, the omap_crtc code
 129  * calls these functions in the proper sequence.
 130  */
 131
 132 int omap_encoder_set_enabled(struct drm_encoder *encoder, bool enabled)
 133 {
 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
 138         if (enabled) {
 139                 return dssdrv->enable(dssdev);
 140         } else {
 141                 dssdrv->disable(dssdev);
 142                 return 0;
 143         }
 144 }
 145
 146 int omap_encoder_update(struct drm_encoder *encoder,
 147                 struct omap_overlay_manager *mgr,
 148                 struct omap_video_timings *timings)
 149 {
 150         struct drm_device *dev = encoder->dev;
 151         struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
 152         struct omap_dss_device *dssdev = omap_encoder->dssdev;
 153         struct omap_dss_driver *dssdrv = dssdev->driver;
 154         int ret;
 155
 156         dssdev->src->manager = mgr;
 157
 158         if (dssdrv->check_timings) {
 159                 ret = dssdrv->check_timings(dssdev, timings);
 160         } else {
 161                 struct omap_video_timings t = {0};
 162
 163                 dssdrv->get_timings(dssdev, &t);
 164
 165                 if (memcmp(timings, &t, sizeof(struct omap_video_timings)))
 166                         ret = -EINVAL;
 167                 else
 168                         ret = 0;
 169         }
 170
 171         if (ret) {
 172                 dev_err(dev->dev, "could not set timings: %d\n", ret);
 173                 return ret;
 174         }
 175
 176         if (dssdrv->set_timings)
 177                 dssdrv->set_timings(dssdev, timings);
 178
 179         return 0;
 180 }
 181
 182 /* initialize encoder */
 183 struct drm_encoder *omap_encoder_init(struct drm_device *dev,
 184                 struct omap_dss_device *dssdev)
 185 {
 186         struct drm_encoder *encoder = NULL;
 187         struct omap_encoder *omap_encoder;
 188
 189         omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL);
 190         if (!omap_encoder)
 191                 goto fail;
 192
 193         omap_encoder->dssdev = dssdev;
 194
 195         encoder = &omap_encoder->base;
 196
 197         drm_encoder_init(dev, encoder, &omap_encoder_funcs,
 198                          DRM_MODE_ENCODER_TMDS);
 199         drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs);
 200
 201         return encoder;
 202
 203 fail:
 204         if (encoder)
 205                 omap_encoder_destroy(encoder);
 206
 207         return NULL;
 208 }