rockchip_rgb.c 3.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
  4. * Author:
  5. * Sandy Huang <hjc@rock-chips.com>
  6. */
  7. #include <linux/component.h>
  8. #include <linux/of_graph.h>
  9. #include <drm/drm_atomic_helper.h>
  10. #include <drm/drm_bridge.h>
  11. #include <drm/drm_dp_helper.h>
  12. #include <drm/drm_of.h>
  13. #include <drm/drm_panel.h>
  14. #include <drm/drm_probe_helper.h>
  15. #include <drm/drm_simple_kms_helper.h>
  16. #include "rockchip_drm_drv.h"
  17. #include "rockchip_drm_vop.h"
  18. #define encoder_to_rgb(c) container_of(c, struct rockchip_rgb, encoder)
  19. struct rockchip_rgb {
  20. struct device *dev;
  21. struct drm_device *drm_dev;
  22. struct drm_bridge *bridge;
  23. struct drm_encoder encoder;
  24. int output_mode;
  25. };
  26. static int
  27. rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
  28. struct drm_crtc_state *crtc_state,
  29. struct drm_connector_state *conn_state)
  30. {
  31. struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
  32. struct drm_connector *connector = conn_state->connector;
  33. struct drm_display_info *info = &connector->display_info;
  34. u32 bus_format;
  35. if (info->num_bus_formats)
  36. bus_format = info->bus_formats[0];
  37. else
  38. bus_format = MEDIA_BUS_FMT_RGB888_1X24;
  39. switch (bus_format) {
  40. case MEDIA_BUS_FMT_RGB666_1X18:
  41. s->output_mode = ROCKCHIP_OUT_MODE_P666;
  42. break;
  43. case MEDIA_BUS_FMT_RGB565_1X16:
  44. s->output_mode = ROCKCHIP_OUT_MODE_P565;
  45. break;
  46. case MEDIA_BUS_FMT_RGB888_1X24:
  47. case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
  48. default:
  49. s->output_mode = ROCKCHIP_OUT_MODE_P888;
  50. break;
  51. }
  52. s->output_type = DRM_MODE_CONNECTOR_LVDS;
  53. return 0;
  54. }
  55. static const
  56. struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
  57. .atomic_check = rockchip_rgb_encoder_atomic_check,
  58. };
  59. struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
  60. struct drm_crtc *crtc,
  61. struct drm_device *drm_dev)
  62. {
  63. struct rockchip_rgb *rgb;
  64. struct drm_encoder *encoder;
  65. struct device_node *port, *endpoint;
  66. u32 endpoint_id;
  67. int ret = 0, child_count = 0;
  68. struct drm_panel *panel;
  69. struct drm_bridge *bridge;
  70. rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL);
  71. if (!rgb)
  72. return ERR_PTR(-ENOMEM);
  73. rgb->dev = dev;
  74. rgb->drm_dev = drm_dev;
  75. port = of_graph_get_port_by_id(dev->of_node, 0);
  76. if (!port)
  77. return ERR_PTR(-EINVAL);
  78. for_each_child_of_node(port, endpoint) {
  79. if (of_property_read_u32(endpoint, "reg", &endpoint_id))
  80. endpoint_id = 0;
  81. /* if subdriver (> 0) or error case (< 0), ignore entry */
  82. if (rockchip_drm_endpoint_is_subdriver(endpoint) != 0)
  83. continue;
  84. child_count++;
  85. ret = drm_of_find_panel_or_bridge(dev->of_node, 0, endpoint_id,
  86. &panel, &bridge);
  87. if (!ret) {
  88. of_node_put(endpoint);
  89. break;
  90. }
  91. }
  92. of_node_put(port);
  93. /* if the rgb output is not connected to anything, just return */
  94. if (!child_count)
  95. return NULL;
  96. if (ret < 0) {
  97. if (ret != -EPROBE_DEFER)
  98. DRM_DEV_ERROR(dev, "failed to find panel or bridge %d\n", ret);
  99. return ERR_PTR(ret);
  100. }
  101. encoder = &rgb->encoder;
  102. encoder->possible_crtcs = drm_crtc_mask(crtc);
  103. ret = drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_NONE);
  104. if (ret < 0) {
  105. DRM_DEV_ERROR(drm_dev->dev,
  106. "failed to initialize encoder: %d\n", ret);
  107. return ERR_PTR(ret);
  108. }
  109. drm_encoder_helper_add(encoder, &rockchip_rgb_encoder_helper_funcs);
  110. if (panel) {
  111. bridge = drm_panel_bridge_add_typed(panel,
  112. DRM_MODE_CONNECTOR_LVDS);
  113. if (IS_ERR(bridge))
  114. return ERR_CAST(bridge);
  115. }
  116. rgb->bridge = bridge;
  117. ret = drm_bridge_attach(encoder, rgb->bridge, NULL, 0);
  118. if (ret) {
  119. DRM_DEV_ERROR(drm_dev->dev,
  120. "failed to attach bridge: %d\n", ret);
  121. goto err_free_encoder;
  122. }
  123. return rgb;
  124. err_free_encoder:
  125. drm_encoder_cleanup(encoder);
  126. return ERR_PTR(ret);
  127. }
  128. EXPORT_SYMBOL_GPL(rockchip_rgb_init);
  129. void rockchip_rgb_fini(struct rockchip_rgb *rgb)
  130. {
  131. drm_panel_bridge_remove(rgb->bridge);
  132. drm_encoder_cleanup(&rgb->encoder);
  133. }
  134. EXPORT_SYMBOL_GPL(rockchip_rgb_fini);