1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
  4 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
  5 */
  6
  7#include <linux/export.h>
  8
  9#include <drm/drm_atomic_helper.h>
 10#include <drm/drm_bridge.h>
 11#include <drm/drm_bridge_connector.h>
 12#include <drm/drm_crtc.h>
 13#include <drm/drm_modeset_helper_vtables.h>
 14#include <drm/drm_panel.h>
 15#include <drm/drm_of.h>
 16#include <drm/drm_simple_kms_helper.h>
 17
 18#include "tidss_crtc.h"
 19#include "tidss_drv.h"
 20#include "tidss_encoder.h"
 21
 22struct tidss_encoder {
 23	struct drm_bridge bridge;
 24	struct drm_encoder encoder;
 25	struct drm_connector *connector;
 26	struct drm_bridge *next_bridge;
 27	struct tidss_device *tidss;
 28};
 29
 30static inline struct tidss_encoder
 31*bridge_to_tidss_encoder(struct drm_bridge *b)
 32{
 33	return container_of(b, struct tidss_encoder, bridge);
 34}
 35
 36static int tidss_bridge_attach(struct drm_bridge *bridge,
 37			       enum drm_bridge_attach_flags flags)
 38{
 39	struct tidss_encoder *t_enc = bridge_to_tidss_encoder(bridge);
 40
 41	return drm_bridge_attach(bridge->encoder, t_enc->next_bridge,
 42				 bridge, flags);
 43}
 44
 45static int tidss_bridge_atomic_check(struct drm_bridge *bridge,
 46				     struct drm_bridge_state *bridge_state,
 47				     struct drm_crtc_state *crtc_state,
 48				     struct drm_connector_state *conn_state)
 49{
 50	struct tidss_encoder *t_enc = bridge_to_tidss_encoder(bridge);
 51	struct tidss_device *tidss = t_enc->tidss;
 52	struct tidss_crtc_state *tcrtc_state = to_tidss_crtc_state(crtc_state);
 53	struct drm_display_info *di = &conn_state->connector->display_info;
 54	struct drm_bridge_state *next_bridge_state = NULL;
 55
 56	if (t_enc->next_bridge)
 57		next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
 58								    t_enc->next_bridge);
 59
 60	if (next_bridge_state) {
 61		tcrtc_state->bus_flags = next_bridge_state->input_bus_cfg.flags;
 62		tcrtc_state->bus_format = next_bridge_state->input_bus_cfg.format;
 63	} else if (di->num_bus_formats) {
 64		tcrtc_state->bus_format = di->bus_formats[0];
 65		tcrtc_state->bus_flags = di->bus_flags;
 66	} else {
 67		dev_err(tidss->dev, "%s: No bus_formats in connected display\n",
 68			__func__);
 69		return -EINVAL;
 70	}
 71
 72	return 0;
 73}
 74
 75static const struct drm_bridge_funcs tidss_bridge_funcs = {
 76	.attach				= tidss_bridge_attach,
 77	.atomic_check			= tidss_bridge_atomic_check,
 78	.atomic_reset			= drm_atomic_helper_bridge_reset,
 79	.atomic_duplicate_state		= drm_atomic_helper_bridge_duplicate_state,
 80	.atomic_destroy_state		= drm_atomic_helper_bridge_destroy_state,
 81};
 82
 83int tidss_encoder_create(struct tidss_device *tidss,
 84			 struct drm_bridge *next_bridge,
 85			 u32 encoder_type, u32 possible_crtcs)
 86{
 87	struct tidss_encoder *t_enc;
 88	struct drm_encoder *enc;
 89	struct drm_connector *connector;
 90	int ret;
 91
 92	t_enc = drmm_simple_encoder_alloc(&tidss->ddev, struct tidss_encoder,
 93					  encoder, encoder_type);
 94	if (IS_ERR(t_enc))
 95		return PTR_ERR(t_enc);
 96
 97	t_enc->tidss = tidss;
 98	t_enc->next_bridge = next_bridge;
 99	t_enc->bridge.funcs = &tidss_bridge_funcs;
100
101	enc = &t_enc->encoder;
102	enc->possible_crtcs = possible_crtcs;
103
104	/* Attaching first bridge to the encoder */
105	ret = drm_bridge_attach(enc, &t_enc->bridge, NULL,
106				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
107	if (ret) {
108		dev_err(tidss->dev, "bridge attach failed: %d\n", ret);
109		return ret;
110	}
111
112	/* Initializing the connector at the end of bridge-chain */
113	connector = drm_bridge_connector_init(&tidss->ddev, enc);
114	if (IS_ERR(connector)) {
115		dev_err(tidss->dev, "bridge_connector create failed\n");
116		return PTR_ERR(connector);
117	}
118
119	ret = drm_connector_attach_encoder(connector, enc);
120	if (ret) {
121		dev_err(tidss->dev, "attaching encoder to connector failed\n");
122		return ret;
123	}
124
125	t_enc->connector = connector;
126
127	dev_dbg(tidss->dev, "Encoder create done\n");
128
129	return ret;
130}