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 enum drm_mode_status
  64 fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
  65                                  struct drm_display_mode *mode)
  66 {
  67         if (mode->hdisplay & 0xf)
  68                 return MODE_ERROR;
  69
  70         return MODE_OK;
  71 }
  72
  73 static const struct drm_connector_helper_funcs connector_helper_funcs = {
  74         .get_modes = fsl_dcu_drm_connector_get_modes,
  75         .mode_valid = fsl_dcu_drm_connector_mode_valid,
  76 };
  77
  78 static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
  79                                  struct drm_panel *panel)
  80 {
  81         struct drm_encoder *encoder = &fsl_dev->encoder;
  82         struct drm_connector *connector = &fsl_dev->connector.base;
  83         int ret;
  84
  85         fsl_dev->connector.encoder = encoder;
  86
  87         ret = drm_connector_init(fsl_dev->drm, connector,
  88                                  &fsl_dcu_drm_connector_funcs,
  89                                  DRM_MODE_CONNECTOR_LVDS);
  90         if (ret < 0)
  91                 return ret;
  92
  93         drm_connector_helper_add(connector, &connector_helper_funcs);
  94         ret = drm_connector_register(connector);
  95         if (ret < 0)
  96                 goto err_cleanup;
  97
  98         ret = drm_connector_attach_encoder(connector, encoder);
  99         if (ret < 0)
 100                 goto err_sysfs;
 101
 102         return 0;
 103
 104 err_sysfs:
 105         drm_connector_unregister(connector);
 106 err_cleanup:
 107         drm_connector_cleanup(connector);
 108         return ret;
 109 }
 110
 111 int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
 112 {
 113         struct device_node *panel_node;
 114         struct drm_panel *panel;
 115         struct drm_bridge *bridge;
 116         int ret;
 117
 118         /* This is for backward compatibility */
 119         panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
 120         if (panel_node) {
 121                 fsl_dev->connector.panel = of_drm_find_panel(panel_node);
 122                 of_node_put(panel_node);
 123                 if (IS_ERR(fsl_dev->connector.panel))
 124                         return PTR_ERR(fsl_dev->connector.panel);
 125
 126                 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
 127         }
 128
 129         ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
 130         if (ret)
 131                 return ret;
 132
 133         if (panel) {
 134                 fsl_dev->connector.panel = panel;
 135                 return fsl_dcu_attach_panel(fsl_dev, panel);
 136         }
 137
 138         return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL, 0);
 139 }