drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 2015 Freescale Semiconductor, Inc.
   4  *
   5  * Freescale DCU drm device driver
   6  */
   7
   8 #include <linux/backlight.h>
   9 #include <linux/of_graph.h>
  10
  11 #include <drm/drm_atomic_helper.h>
  12 #include <drm/drm_bridge.h>
  13 #include <drm/drm_of.h>
  14 #include <drm/drm_panel.h>
  15 #include <drm/drm_probe_helper.h>
  16
  17 #include "fsl_dcu_drm_drv.h"
  18 #include "fsl_tcon.h"
  19
  20 static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder)
  21 {
  22         drm_encoder_cleanup(encoder);
  23 }
  24
  25 static const struct drm_encoder_funcs encoder_funcs = {
  26         .destroy = fsl_dcu_drm_encoder_destroy,
  27 };
  28
  29 int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
  30                                struct drm_crtc *crtc)
  31 {
  32         struct drm_encoder *encoder = &fsl_dev->encoder;
  33         int ret;
  34
  35         encoder->possible_crtcs = 1;
  36
  37         /* Use bypass mode for parallel RGB/LVDS encoder */
  38         if (fsl_dev->tcon)
  39                 fsl_tcon_bypass_enable(fsl_dev->tcon);
  40
  41         ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs,
  42                                DRM_MODE_ENCODER_LVDS, NULL);
  43         if (ret < 0)
  44                 return ret;
  45
  46         return 0;
  47 }
  48
  49 static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
  50 {
  51         struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector);
  52
  53         drm_connector_unregister(connector);
  54         drm_panel_detach(fsl_con->panel);
  55         drm_connector_cleanup(connector);
  56 }
  57
  58 static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
  59         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  60         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  61         .destroy = fsl_dcu_drm_connector_destroy,
  62         .fill_modes = drm_helper_probe_single_connector_modes,
  63         .reset = drm_atomic_helper_connector_reset,
  64 };
  65
  66 static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
  67 {
  68         struct fsl_dcu_drm_connector *fsl_connector;
  69
  70         fsl_connector = to_fsl_dcu_connector(connector);
  71         return drm_panel_get_modes(fsl_connector->panel, connector);
  72 }
  73
  74 static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
  75                                             struct drm_display_mode *mode)
  76 {
  77         if (mode->hdisplay & 0xf)
  78                 return MODE_ERROR;
  79
  80         return MODE_OK;
  81 }
  82
  83 static const struct drm_connector_helper_funcs connector_helper_funcs = {
  84         .get_modes = fsl_dcu_drm_connector_get_modes,
  85         .mode_valid = fsl_dcu_drm_connector_mode_valid,
  86 };
  87
  88 static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
  89                                  struct drm_panel *panel)
  90 {
  91         struct drm_encoder *encoder = &fsl_dev->encoder;
  92         struct drm_connector *connector = &fsl_dev->connector.base;
  93         int ret;
  94
  95         fsl_dev->connector.encoder = encoder;
  96
  97         ret = drm_connector_init(fsl_dev->drm, connector,
  98                                  &fsl_dcu_drm_connector_funcs,
  99                                  DRM_MODE_CONNECTOR_LVDS);
 100         if (ret < 0)
 101                 return ret;
 102
 103         drm_connector_helper_add(connector, &connector_helper_funcs);
 104         ret = drm_connector_register(connector);
 105         if (ret < 0)
 106                 goto err_cleanup;
 107
 108         ret = drm_connector_attach_encoder(connector, encoder);
 109         if (ret < 0)
 110                 goto err_sysfs;
 111
 112         ret = drm_panel_attach(panel, connector);
 113         if (ret) {
 114                 dev_err(fsl_dev->dev, "failed to attach panel\n");
 115                 goto err_sysfs;
 116         }
 117
 118         return 0;
 119
 120 err_sysfs:
 121         drm_connector_unregister(connector);
 122 err_cleanup:
 123         drm_connector_cleanup(connector);
 124         return ret;
 125 }
 126
 127 int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
 128 {
 129         struct device_node *panel_node;
 130         struct drm_panel *panel;
 131         struct drm_bridge *bridge;
 132         int ret;
 133
 134         /* This is for backward compatibility */
 135         panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
 136         if (panel_node) {
 137                 fsl_dev->connector.panel = of_drm_find_panel(panel_node);
 138                 of_node_put(panel_node);
 139                 if (IS_ERR(fsl_dev->connector.panel))
 140                         return PTR_ERR(fsl_dev->connector.panel);
 141
 142                 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
 143         }
 144
 145         ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
 146         if (ret)
 147                 return ret;
 148
 149         if (panel) {
 150                 fsl_dev->connector.panel = panel;
 151                 return fsl_dcu_attach_panel(fsl_dev, panel);
 152         }
 153
 154         return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL);
 155 }