drivers/gpu/drm/sun4i/sun4i_lvds.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2017 Free Electrons
   4  * Maxime Ripard <maxime.ripard@free-electrons.com>
   5  */
   6
   7 #include <linux/clk.h>
   8
   9 #include <drm/drm_atomic_helper.h>
  10 #include <drm/drm_bridge.h>
  11 #include <drm/drm_of.h>
  12 #include <drm/drm_panel.h>
  13 #include <drm/drm_print.h>
  14 #include <drm/drm_probe_helper.h>
  15
  16 #include "sun4i_crtc.h"
  17 #include "sun4i_tcon.h"
  18 #include "sun4i_lvds.h"
  19
  20 struct sun4i_lvds {
  21         struct drm_connector    connector;
  22         struct drm_encoder      encoder;
  23
  24         struct drm_panel        *panel;
  25 };
  26
  27 static inline struct sun4i_lvds *
  28 drm_connector_to_sun4i_lvds(struct drm_connector *connector)
  29 {
  30         return container_of(connector, struct sun4i_lvds,
  31                             connector);
  32 }
  33
  34 static inline struct sun4i_lvds *
  35 drm_encoder_to_sun4i_lvds(struct drm_encoder *encoder)
  36 {
  37         return container_of(encoder, struct sun4i_lvds,
  38                             encoder);
  39 }
  40
  41 static int sun4i_lvds_get_modes(struct drm_connector *connector)
  42 {
  43         struct sun4i_lvds *lvds =
  44                 drm_connector_to_sun4i_lvds(connector);
  45
  46         return drm_panel_get_modes(lvds->panel, connector);
  47 }
  48
  49 static struct drm_connector_helper_funcs sun4i_lvds_con_helper_funcs = {
  50         .get_modes      = sun4i_lvds_get_modes,
  51 };
  52
  53 static void
  54 sun4i_lvds_connector_destroy(struct drm_connector *connector)
  55 {
  56         struct sun4i_lvds *lvds = drm_connector_to_sun4i_lvds(connector);
  57
  58         drm_panel_detach(lvds->panel);
  59         drm_connector_cleanup(connector);
  60 }
  61
  62 static const struct drm_connector_funcs sun4i_lvds_con_funcs = {
  63         .fill_modes             = drm_helper_probe_single_connector_modes,
  64         .destroy                = sun4i_lvds_connector_destroy,
  65         .reset                  = drm_atomic_helper_connector_reset,
  66         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  67         .atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
  68 };
  69
  70 static void sun4i_lvds_encoder_enable(struct drm_encoder *encoder)
  71 {
  72         struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(encoder);
  73
  74         DRM_DEBUG_DRIVER("Enabling LVDS output\n");
  75
  76         if (lvds->panel) {
  77                 drm_panel_prepare(lvds->panel);
  78                 drm_panel_enable(lvds->panel);
  79         }
  80 }
  81
  82 static void sun4i_lvds_encoder_disable(struct drm_encoder *encoder)
  83 {
  84         struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(encoder);
  85
  86         DRM_DEBUG_DRIVER("Disabling LVDS output\n");
  87
  88         if (lvds->panel) {
  89                 drm_panel_disable(lvds->panel);
  90                 drm_panel_unprepare(lvds->panel);
  91         }
  92 }
  93
  94 static const struct drm_encoder_helper_funcs sun4i_lvds_enc_helper_funcs = {
  95         .disable        = sun4i_lvds_encoder_disable,
  96         .enable         = sun4i_lvds_encoder_enable,
  97 };
  98
  99 static const struct drm_encoder_funcs sun4i_lvds_enc_funcs = {
 100         .destroy        = drm_encoder_cleanup,
 101 };
 102
 103 int sun4i_lvds_init(struct drm_device *drm, struct sun4i_tcon *tcon)
 104 {
 105         struct drm_encoder *encoder;
 106         struct drm_bridge *bridge;
 107         struct sun4i_lvds *lvds;
 108         int ret;
 109
 110         lvds = devm_kzalloc(drm->dev, sizeof(*lvds), GFP_KERNEL);
 111         if (!lvds)
 112                 return -ENOMEM;
 113         encoder = &lvds->encoder;
 114
 115         ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
 116                                           &lvds->panel, &bridge);
 117         if (ret) {
 118                 dev_info(drm->dev, "No panel or bridge found... LVDS output disabled\n");
 119                 return 0;
 120         }
 121
 122         drm_encoder_helper_add(&lvds->encoder,
 123                                &sun4i_lvds_enc_helper_funcs);
 124         ret = drm_encoder_init(drm,
 125                                &lvds->encoder,
 126                                &sun4i_lvds_enc_funcs,
 127                                DRM_MODE_ENCODER_LVDS,
 128                                NULL);
 129         if (ret) {
 130                 dev_err(drm->dev, "Couldn't initialise the lvds encoder\n");
 131                 goto err_out;
 132         }
 133
 134         /* The LVDS encoder can only work with the TCON channel 0 */
 135         lvds->encoder.possible_crtcs = drm_crtc_mask(&tcon->crtc->crtc);
 136
 137         if (lvds->panel) {
 138                 drm_connector_helper_add(&lvds->connector,
 139                                          &sun4i_lvds_con_helper_funcs);
 140                 ret = drm_connector_init(drm, &lvds->connector,
 141                                          &sun4i_lvds_con_funcs,
 142                                          DRM_MODE_CONNECTOR_LVDS);
 143                 if (ret) {
 144                         dev_err(drm->dev, "Couldn't initialise the lvds connector\n");
 145                         goto err_cleanup_connector;
 146                 }
 147
 148                 drm_connector_attach_encoder(&lvds->connector,
 149                                                   &lvds->encoder);
 150
 151                 ret = drm_panel_attach(lvds->panel, &lvds->connector);
 152                 if (ret) {
 153                         dev_err(drm->dev, "Couldn't attach our panel\n");
 154                         goto err_cleanup_connector;
 155                 }
 156         }
 157
 158         if (bridge) {
 159                 ret = drm_bridge_attach(encoder, bridge, NULL);
 160                 if (ret) {
 161                         dev_err(drm->dev, "Couldn't attach our bridge\n");
 162                         goto err_cleanup_connector;
 163                 }
 164         }
 165
 166         return 0;
 167
 168 err_cleanup_connector:
 169         drm_encoder_cleanup(&lvds->encoder);
 170 err_out:
 171         return ret;
 172 }
 173 EXPORT_SYMBOL(sun4i_lvds_init);