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/drmP.h>
  10 #include <drm/drm_atomic_helper.h>
  11 #include <drm/drm_of.h>
  12 #include <drm/drm_panel.h>
  13 #include <drm/drm_probe_helper.h>
  14
  15 #include "sun4i_crtc.h"
  16 #include "sun4i_tcon.h"
  17 #include "sun4i_lvds.h"
  18
  19 struct sun4i_lvds {
  20         struct drm_connector    connector;
  21         struct drm_encoder      encoder;
  22
  23         struct sun4i_tcon       *tcon;
  24 };
  25
  26 static inline struct sun4i_lvds *
  27 drm_connector_to_sun4i_lvds(struct drm_connector *connector)
  28 {
  29         return container_of(connector, struct sun4i_lvds,
  30                             connector);
  31 }
  32
  33 static inline struct sun4i_lvds *
  34 drm_encoder_to_sun4i_lvds(struct drm_encoder *encoder)
  35 {
  36         return container_of(encoder, struct sun4i_lvds,
  37                             encoder);
  38 }
  39
  40 static int sun4i_lvds_get_modes(struct drm_connector *connector)
  41 {
  42         struct sun4i_lvds *lvds =
  43                 drm_connector_to_sun4i_lvds(connector);
  44         struct sun4i_tcon *tcon = lvds->tcon;
  45
  46         return drm_panel_get_modes(tcon->panel);
  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         struct sun4i_tcon *tcon = lvds->tcon;
  58
  59         drm_panel_detach(tcon->panel);
  60         drm_connector_cleanup(connector);
  61 }
  62
  63 static const struct drm_connector_funcs sun4i_lvds_con_funcs = {
  64         .fill_modes             = drm_helper_probe_single_connector_modes,
  65         .destroy                = sun4i_lvds_connector_destroy,
  66         .reset                  = drm_atomic_helper_connector_reset,
  67         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  68         .atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
  69 };
  70
  71 static void sun4i_lvds_encoder_enable(struct drm_encoder *encoder)
  72 {
  73         struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(encoder);
  74         struct sun4i_tcon *tcon = lvds->tcon;
  75
  76         DRM_DEBUG_DRIVER("Enabling LVDS output\n");
  77
  78         if (tcon->panel) {
  79                 drm_panel_prepare(tcon->panel);
  80                 drm_panel_enable(tcon->panel);
  81         }
  82 }
  83
  84 static void sun4i_lvds_encoder_disable(struct drm_encoder *encoder)
  85 {
  86         struct sun4i_lvds *lvds = drm_encoder_to_sun4i_lvds(encoder);
  87         struct sun4i_tcon *tcon = lvds->tcon;
  88
  89         DRM_DEBUG_DRIVER("Disabling LVDS output\n");
  90
  91         if (tcon->panel) {
  92                 drm_panel_disable(tcon->panel);
  93                 drm_panel_unprepare(tcon->panel);
  94         }
  95 }
  96
  97 static const struct drm_encoder_helper_funcs sun4i_lvds_enc_helper_funcs = {
  98         .disable        = sun4i_lvds_encoder_disable,
  99         .enable         = sun4i_lvds_encoder_enable,
 100 };
 101
 102 static const struct drm_encoder_funcs sun4i_lvds_enc_funcs = {
 103         .destroy        = drm_encoder_cleanup,
 104 };
 105
 106 int sun4i_lvds_init(struct drm_device *drm, struct sun4i_tcon *tcon)
 107 {
 108         struct drm_encoder *encoder;
 109         struct drm_bridge *bridge;
 110         struct sun4i_lvds *lvds;
 111         int ret;
 112
 113         lvds = devm_kzalloc(drm->dev, sizeof(*lvds), GFP_KERNEL);
 114         if (!lvds)
 115                 return -ENOMEM;
 116         lvds->tcon = tcon;
 117         encoder = &lvds->encoder;
 118
 119         ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
 120                                           &tcon->panel, &bridge);
 121         if (ret) {
 122                 dev_info(drm->dev, "No panel or bridge found... LVDS output disabled\n");
 123                 return 0;
 124         }
 125
 126         drm_encoder_helper_add(&lvds->encoder,
 127                                &sun4i_lvds_enc_helper_funcs);
 128         ret = drm_encoder_init(drm,
 129                                &lvds->encoder,
 130                                &sun4i_lvds_enc_funcs,
 131                                DRM_MODE_ENCODER_LVDS,
 132                                NULL);
 133         if (ret) {
 134                 dev_err(drm->dev, "Couldn't initialise the lvds encoder\n");
 135                 goto err_out;
 136         }
 137
 138         /* The LVDS encoder can only work with the TCON channel 0 */
 139         lvds->encoder.possible_crtcs = drm_crtc_mask(&tcon->crtc->crtc);
 140
 141         if (tcon->panel) {
 142                 drm_connector_helper_add(&lvds->connector,
 143                                          &sun4i_lvds_con_helper_funcs);
 144                 ret = drm_connector_init(drm, &lvds->connector,
 145                                          &sun4i_lvds_con_funcs,
 146                                          DRM_MODE_CONNECTOR_LVDS);
 147                 if (ret) {
 148                         dev_err(drm->dev, "Couldn't initialise the lvds connector\n");
 149                         goto err_cleanup_connector;
 150                 }
 151
 152                 drm_connector_attach_encoder(&lvds->connector,
 153                                                   &lvds->encoder);
 154
 155                 ret = drm_panel_attach(tcon->panel, &lvds->connector);
 156                 if (ret) {
 157                         dev_err(drm->dev, "Couldn't attach our panel\n");
 158                         goto err_cleanup_connector;
 159                 }
 160         }
 161
 162         if (bridge) {
 163                 ret = drm_bridge_attach(encoder, bridge, NULL);
 164                 if (ret) {
 165                         dev_err(drm->dev, "Couldn't attach our bridge\n");
 166                         goto err_cleanup_connector;
 167                 }
 168         }
 169
 170         return 0;
 171
 172 err_cleanup_connector:
 173         drm_encoder_cleanup(&lvds->encoder);
 174 err_out:
 175         return ret;
 176 }
 177 EXPORT_SYMBOL(sun4i_lvds_init);