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 #include <drm/drm_simple_kms_helper.h>
  17
  18 #include "fsl_dcu_drm_drv.h"
  19 #include "fsl_tcon.h"
  20
  21 int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
  22                                struct drm_crtc *crtc)
  23 {
  24         struct drm_encoder *encoder = &fsl_dev->encoder;
  25         int ret;
  26
  27         encoder->possible_crtcs = 1;
  28
  29         /* Use bypass mode for parallel RGB/LVDS encoder */
  30         if (fsl_dev->tcon)
  31                 fsl_tcon_bypass_enable(fsl_dev->tcon);
  32
  33         ret = drm_simple_encoder_init(fsl_dev->drm, encoder,
  34                                       DRM_MODE_ENCODER_LVDS);
  35         if (ret < 0)
  36                 return ret;
  37
  38         return 0;
  39 }
  40
  41 static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
  42 {
  43         drm_connector_unregister(connector);
  44         drm_connector_cleanup(connector);
  45 }
  46
  47 static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
  48         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  49         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  50         .destroy = fsl_dcu_drm_connector_destroy,
  51         .fill_modes = drm_helper_probe_single_connector_modes,
  52         .reset = drm_atomic_helper_connector_reset,
  53 };
  54
  55 static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
  56 {
  57         struct fsl_dcu_drm_connector *fsl_connector;
  58
  59         fsl_connector = to_fsl_dcu_connector(connector);
  60         return drm_panel_get_modes(fsl_connector->panel, connector);
  61 }
  62
  63 static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
  64                                             struct drm_display_mode *mode)
  65 {
  66         if (mode->hdisplay & 0xf)
  67                 return MODE_ERROR;
  68
  69         return MODE_OK;
  70 }
  71
  72 static const struct drm_connector_helper_funcs connector_helper_funcs = {
  73         .get_modes = fsl_dcu_drm_connector_get_modes,
  74         .mode_valid = fsl_dcu_drm_connector_mode_valid,
  75 };
  76
  77 static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
  78                                  struct drm_panel *panel)
  79 {
  80         struct drm_encoder *encoder = &fsl_dev->encoder;
  81         struct drm_connector *connector = &fsl_dev->connector.base;
  82         int ret;
  83
  84         fsl_dev->connector.encoder = encoder;
  85
  86         ret = drm_connector_init(fsl_dev->drm, connector,
  87                                  &fsl_dcu_drm_connector_funcs,
  88                                  DRM_MODE_CONNECTOR_LVDS);
  89         if (ret < 0)
  90                 return ret;
  91
  92         drm_connector_helper_add(connector, &connector_helper_funcs);
  93         ret = drm_connector_register(connector);
  94         if (ret < 0)
  95                 goto err_cleanup;
  96
  97         ret = drm_connector_attach_encoder(connector, encoder);
  98         if (ret < 0)
  99                 goto err_sysfs;
 100
 101         return 0;
 102
 103 err_sysfs:
 104         drm_connector_unregister(connector);
 105 err_cleanup:
 106         drm_connector_cleanup(connector);
 107         return ret;
 108 }
 109
 110 int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
 111 {
 112         struct device_node *panel_node;
 113         struct drm_panel *panel;
 114         struct drm_bridge *bridge;
 115         int ret;
 116
 117         /* This is for backward compatibility */
 118         panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
 119         if (panel_node) {
 120                 fsl_dev->connector.panel = of_drm_find_panel(panel_node);
 121                 of_node_put(panel_node);
 122                 if (IS_ERR(fsl_dev->connector.panel))
 123                         return PTR_ERR(fsl_dev->connector.panel);
 124
 125                 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
 126         }
 127
 128         ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
 129         if (ret)
 130                 return ret;
 131
 132         if (panel) {
 133                 fsl_dev->connector.panel = panel;
 134                 return fsl_dcu_attach_panel(fsl_dev, panel);
 135         }
 136
 137         return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL, 0);
 138 }