drivers/gpu/drm/omapdrm/omap_connector.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
   4  * Author: Rob Clark <rob@ti.com>
   5  */
   6
   7 #include <drm/drm_atomic_helper.h>
   8 #include <drm/drm_crtc.h>
   9 #include <drm/drm_probe_helper.h>
  10
  11 #include "omap_drv.h"
  12
  13 /*
  14  * connector funcs
  15  */
  16
  17 #define to_omap_connector(x) container_of(x, struct omap_connector, base)
  18
  19 struct omap_connector {
  20         struct drm_connector base;
  21         struct omap_dss_device *output;
  22 };
  23
  24 static enum drm_connector_status omap_connector_detect(
  25                 struct drm_connector *connector, bool force)
  26 {
  27         return connector_status_connected;
  28 }
  29
  30 static void omap_connector_destroy(struct drm_connector *connector)
  31 {
  32         struct omap_connector *omap_connector = to_omap_connector(connector);
  33
  34         DBG("%s", connector->name);
  35
  36         drm_connector_unregister(connector);
  37         drm_connector_cleanup(connector);
  38
  39         omapdss_device_put(omap_connector->output);
  40
  41         kfree(omap_connector);
  42 }
  43
  44 static int omap_connector_get_modes(struct drm_connector *connector)
  45 {
  46         struct omap_connector *omap_connector = to_omap_connector(connector);
  47         struct omap_dss_device *dssdev = NULL;
  48         struct omap_dss_device *d;
  49
  50         DBG("%s", connector->name);
  51
  52         /*
  53          * If the display pipeline reports modes (e.g. with a fixed resolution
  54          * panel or an analog TV output), query it.
  55          */
  56         for (d = omap_connector->output; d; d = d->next) {
  57                 if (d->ops_flags & OMAP_DSS_DEVICE_OP_MODES)
  58                         dssdev = d;
  59         }
  60
  61         if (dssdev)
  62                 return dssdev->ops->get_modes(dssdev, connector);
  63
  64         /* We can't retrieve modes. The KMS core will add the default modes. */
  65         return 0;
  66 }
  67
  68 enum drm_mode_status omap_connector_mode_fixup(struct omap_dss_device *dssdev,
  69                                         const struct drm_display_mode *mode,
  70                                         struct drm_display_mode *adjusted_mode)
  71 {
  72         int ret;
  73
  74         drm_mode_copy(adjusted_mode, mode);
  75
  76         for (; dssdev; dssdev = dssdev->next) {
  77                 if (!dssdev->ops || !dssdev->ops->check_timings)
  78                         continue;
  79
  80                 ret = dssdev->ops->check_timings(dssdev, adjusted_mode);
  81                 if (ret)
  82                         return MODE_BAD;
  83         }
  84
  85         return MODE_OK;
  86 }
  87
  88 static enum drm_mode_status omap_connector_mode_valid(struct drm_connector *connector,
  89                                  struct drm_display_mode *mode)
  90 {
  91         struct omap_connector *omap_connector = to_omap_connector(connector);
  92         struct drm_display_mode new_mode = {};
  93         enum drm_mode_status status;
  94
  95         status = omap_connector_mode_fixup(omap_connector->output, mode,
  96                                            &new_mode);
  97         if (status != MODE_OK)
  98                 goto done;
  99
 100         /* Check if vrefresh is still valid. */
 101         if (drm_mode_vrefresh(mode) != drm_mode_vrefresh(&new_mode))
 102                 status = MODE_NOCLOCK;
 103
 104 done:
 105         DBG("connector: mode %s: " DRM_MODE_FMT,
 106                         (status == MODE_OK) ? "valid" : "invalid",
 107                         DRM_MODE_ARG(mode));
 108
 109         return status;
 110 }
 111
 112 static const struct drm_connector_funcs omap_connector_funcs = {
 113         .reset = drm_atomic_helper_connector_reset,
 114         .detect = omap_connector_detect,
 115         .fill_modes = drm_helper_probe_single_connector_modes,
 116         .destroy = omap_connector_destroy,
 117         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 118         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 119 };
 120
 121 static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
 122         .get_modes = omap_connector_get_modes,
 123         .mode_valid = omap_connector_mode_valid,
 124 };
 125
 126 /* initialize connector */
 127 struct drm_connector *omap_connector_init(struct drm_device *dev,
 128                                           struct omap_dss_device *output,
 129                                           struct drm_encoder *encoder)
 130 {
 131         struct drm_connector *connector = NULL;
 132         struct omap_connector *omap_connector;
 133
 134         DBG("%s", output->name);
 135
 136         omap_connector = kzalloc(sizeof(*omap_connector), GFP_KERNEL);
 137         if (!omap_connector)
 138                 goto fail;
 139
 140         omap_connector->output = omapdss_device_get(output);
 141
 142         connector = &omap_connector->base;
 143         connector->interlace_allowed = 1;
 144         connector->doublescan_allowed = 0;
 145
 146         drm_connector_init(dev, connector, &omap_connector_funcs,
 147                            DRM_MODE_CONNECTOR_DSI);
 148         drm_connector_helper_add(connector, &omap_connector_helper_funcs);
 149
 150         return connector;
 151
 152 fail:
 153         if (connector)
 154                 omap_connector_destroy(connector);
 155
 156         return NULL;
 157 }