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