kernel/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 <drm/drm_edid.h>
  21
  22 #include "omap_drv.h"
  23
  24 #include "drm_crtc.h"
  25 #include "drm_crtc_helper.h"
  26
  27 #include <linux/list.h>
  28
  29
  30 /*
  31  * encoder funcs
  32  */
  33
  34 #define to_omap_encoder(x) container_of(x, struct omap_encoder, base)
  35
  36 /* The encoder and connector both map to same dssdev.. the encoder
  37  * handles the 'active' parts, ie. anything the modifies the state
  38  * of the hw, and the connector handles the 'read-only' parts, like
  39  * detecting connection and reading edid.
  40  */
  41 struct omap_encoder {
  42         struct drm_encoder base;
  43         struct omap_dss_device *dssdev;
  44 };
  45
  46 struct omap_dss_device *omap_encoder_get_dssdev(struct drm_encoder *encoder)
  47 {
  48         struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
  49
  50         return omap_encoder->dssdev;
  51 }
  52
  53 static void omap_encoder_destroy(struct drm_encoder *encoder)
  54 {
  55         struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
  56
  57         omap_encoder_set_enabled(encoder, false);
  58
  59         drm_encoder_cleanup(encoder);
  60         kfree(omap_encoder);
  61 }
  62
  63 static const struct drm_encoder_funcs omap_encoder_funcs = {
  64         .destroy = omap_encoder_destroy,
  65 };
  66
  67 /*
  68  * The CRTC drm_crtc_helper_set_mode() doesn't really give us the right
  69  * order.. the easiest way to work around this for now is to make all
  70  * the encoder-helper's no-op's and have the omap_crtc code take care
  71  * of the sequencing and call us in the right points.
  72  *
  73  * Eventually to handle connecting CRTCs to different encoders properly,
  74  * either the CRTC helpers need to change or we need to replace
  75  * drm_crtc_helper_set_mode(), but lets wait until atomic-modeset for
  76  * that.
  77  */
  78
  79 static void omap_encoder_dpms(struct drm_encoder *encoder, int mode)
  80 {
  81 }
  82
  83 static bool omap_encoder_mode_fixup(struct drm_encoder *encoder,
  84                                   const struct drm_display_mode *mode,
  85                                   struct drm_display_mode *adjusted_mode)
  86 {
  87         return true;
  88 }
  89
  90 static void omap_encoder_mode_set(struct drm_encoder *encoder,
  91                                 struct drm_display_mode *mode,
  92                                 struct drm_display_mode *adjusted_mode)
  93 {
  94         struct drm_device *dev = encoder->dev;
  95         struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
  96         struct omap_dss_device *dssdev = omap_encoder->dssdev;
  97         struct drm_connector *connector;
  98         bool hdmi_mode;
  99         int r;
 100
 101         hdmi_mode = false;
 102         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 103                 if (connector->encoder == encoder) {
 104                         hdmi_mode = omap_connector_get_hdmi_mode(connector);
 105                         break;
 106                 }
 107         }
 108
 109         if (dssdev->driver->set_hdmi_mode)
 110                 dssdev->driver->set_hdmi_mode(dssdev, hdmi_mode);
 111
 112         if (hdmi_mode && dssdev->driver->set_hdmi_infoframe) {
 113                 struct hdmi_avi_infoframe avi;
 114
 115                 r = drm_hdmi_avi_infoframe_from_display_mode(&avi, adjusted_mode);
 116                 if (r == 0)
 117                         dssdev->driver->set_hdmi_infoframe(dssdev, &avi);
 118         }
 119 }
 120
 121 static void omap_encoder_prepare(struct drm_encoder *encoder)
 122 {
 123 }
 124
 125 static void omap_encoder_commit(struct drm_encoder *encoder)
 126 {
 127 }
 128
 129 static const struct drm_encoder_helper_funcs omap_encoder_helper_funcs = {
 130         .dpms = omap_encoder_dpms,
 131         .mode_fixup = omap_encoder_mode_fixup,
 132         .mode_set = omap_encoder_mode_set,
 133         .prepare = omap_encoder_prepare,
 134         .commit = omap_encoder_commit,
 135 };
 136
 137 /*
 138  * Instead of relying on the helpers for modeset, the omap_crtc code
 139  * calls these functions in the proper sequence.
 140  */
 141
 142 int omap_encoder_set_enabled(struct drm_encoder *encoder, bool enabled)
 143 {
 144         struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
 145         struct omap_dss_device *dssdev = omap_encoder->dssdev;
 146         struct omap_dss_driver *dssdrv = dssdev->driver;
 147
 148         if (enabled) {
 149                 return dssdrv->enable(dssdev);
 150         } else {
 151                 dssdrv->disable(dssdev);
 152                 return 0;
 153         }
 154 }
 155
 156 int omap_encoder_update(struct drm_encoder *encoder,
 157                 struct omap_overlay_manager *mgr,
 158                 struct omap_video_timings *timings)
 159 {
 160         struct drm_device *dev = encoder->dev;
 161         struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
 162         struct omap_dss_device *dssdev = omap_encoder->dssdev;
 163         struct omap_dss_driver *dssdrv = dssdev->driver;
 164         int ret;
 165
 166         dssdev->src->manager = mgr;
 167
 168         if (dssdrv->check_timings) {
 169                 ret = dssdrv->check_timings(dssdev, timings);
 170         } else {
 171                 struct omap_video_timings t = {0};
 172
 173                 dssdrv->get_timings(dssdev, &t);
 174
 175                 if (memcmp(timings, &t, sizeof(struct omap_video_timings)))
 176                         ret = -EINVAL;
 177                 else
 178                         ret = 0;
 179         }
 180
 181         if (ret) {
 182                 dev_err(dev->dev, "could not set timings: %d\n", ret);
 183                 return ret;
 184         }
 185
 186         if (dssdrv->set_timings)
 187                 dssdrv->set_timings(dssdev, timings);
 188
 189         return 0;
 190 }
 191
 192 /* initialize encoder */
 193 struct drm_encoder *omap_encoder_init(struct drm_device *dev,
 194                 struct omap_dss_device *dssdev)
 195 {
 196         struct drm_encoder *encoder = NULL;
 197         struct omap_encoder *omap_encoder;
 198
 199         omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL);
 200         if (!omap_encoder)
 201                 goto fail;
 202
 203         omap_encoder->dssdev = dssdev;
 204
 205         encoder = &omap_encoder->base;
 206
 207         drm_encoder_init(dev, encoder, &omap_encoder_funcs,
 208                          DRM_MODE_ENCODER_TMDS);
 209         drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs);
 210
 211         return encoder;
 212
 213 fail:
 214         if (encoder)
 215                 omap_encoder_destroy(encoder);
 216
 217         return NULL;
 218 }