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