1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Copyright (C) 2016 BayLibre, SAS
  4 * Author: Neil Armstrong <narmstrong@baylibre.com>
  5 * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
  6 */
  7
  8#include <linux/kernel.h>
  9#include <linux/module.h>
 10#include <linux/of_graph.h>
 11
 12#include <drm/drm_atomic_helper.h>
 13#include <drm/drm_simple_kms_helper.h>
 14#include <drm/drm_bridge.h>
 15#include <drm/drm_bridge_connector.h>
 16#include <drm/drm_device.h>
 17#include <drm/drm_probe_helper.h>
 18
 19#include "meson_drv.h"
 20#include "meson_encoder_dsi.h"
 21#include "meson_registers.h"
 22#include "meson_venc.h"
 23#include "meson_vclk.h"
 24
 25struct meson_encoder_dsi {
 26	struct drm_encoder encoder;
 27	struct drm_bridge bridge;
 28	struct drm_bridge *next_bridge;
 29	struct meson_drm *priv;
 30};
 31
 32#define bridge_to_meson_encoder_dsi(x) \
 33	container_of(x, struct meson_encoder_dsi, bridge)
 34
 35static int meson_encoder_dsi_attach(struct drm_bridge *bridge,
 36				    enum drm_bridge_attach_flags flags)
 37{
 38	struct meson_encoder_dsi *encoder_dsi = bridge_to_meson_encoder_dsi(bridge);
 39
 40	return drm_bridge_attach(bridge->encoder, encoder_dsi->next_bridge,
 41				 &encoder_dsi->bridge, flags);
 42}
 43
 44static void meson_encoder_dsi_atomic_enable(struct drm_bridge *bridge,
 45					    struct drm_bridge_state *bridge_state)
 46{
 47	struct meson_encoder_dsi *encoder_dsi = bridge_to_meson_encoder_dsi(bridge);
 48	struct drm_atomic_state *state = bridge_state->base.state;
 49	struct meson_drm *priv = encoder_dsi->priv;
 50	struct drm_connector_state *conn_state;
 51	struct drm_crtc_state *crtc_state;
 52	struct drm_connector *connector;
 53
 54	connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
 55	if (WARN_ON(!connector))
 56		return;
 57
 58	conn_state = drm_atomic_get_new_connector_state(state, connector);
 59	if (WARN_ON(!conn_state))
 60		return;
 61
 62	crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
 63	if (WARN_ON(!crtc_state))
 64		return;
 65
 66	/* ENCL clock setup is handled by CCF */
 67
 68	meson_venc_mipi_dsi_mode_set(priv, &crtc_state->adjusted_mode);
 69	meson_encl_load_gamma(priv);
 70
 71	writel_relaxed(0, priv->io_base + _REG(ENCL_VIDEO_EN));
 72
 73	writel_bits_relaxed(ENCL_VIDEO_MODE_ADV_VFIFO_EN, ENCL_VIDEO_MODE_ADV_VFIFO_EN,
 74			    priv->io_base + _REG(ENCL_VIDEO_MODE_ADV));
 75	writel_relaxed(0, priv->io_base + _REG(ENCL_TST_EN));
 76
 77	writel_bits_relaxed(BIT(0), 0, priv->io_base + _REG(VPP_WRAP_OSD1_MATRIX_EN_CTRL));
 78
 79	writel_relaxed(1, priv->io_base + _REG(ENCL_VIDEO_EN));
 80}
 81
 82static void meson_encoder_dsi_atomic_disable(struct drm_bridge *bridge,
 83					     struct drm_bridge_state *bridge_state)
 84{
 85	struct meson_encoder_dsi *meson_encoder_dsi =
 86					bridge_to_meson_encoder_dsi(bridge);
 87	struct meson_drm *priv = meson_encoder_dsi->priv;
 88
 89	writel_relaxed(0, priv->io_base + _REG(ENCL_VIDEO_EN));
 90
 91	writel_bits_relaxed(BIT(0), BIT(0), priv->io_base + _REG(VPP_WRAP_OSD1_MATRIX_EN_CTRL));
 92}
 93
 94static const struct drm_bridge_funcs meson_encoder_dsi_bridge_funcs = {
 95	.attach	= meson_encoder_dsi_attach,
 96	.atomic_enable = meson_encoder_dsi_atomic_enable,
 97	.atomic_disable	= meson_encoder_dsi_atomic_disable,
 98	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 99	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
100	.atomic_reset = drm_atomic_helper_bridge_reset,
101};
102
103int meson_encoder_dsi_init(struct meson_drm *priv)
104{
105	struct meson_encoder_dsi *meson_encoder_dsi;
106	struct device_node *remote;
107	int ret;
108
109	meson_encoder_dsi = devm_kzalloc(priv->dev, sizeof(*meson_encoder_dsi), GFP_KERNEL);
110	if (!meson_encoder_dsi)
111		return -ENOMEM;
112
113	/* DSI Transceiver Bridge */
114	remote = of_graph_get_remote_node(priv->dev->of_node, 2, 0);
115	if (!remote) {
116		dev_err(priv->dev, "DSI transceiver device is disabled");
117		return 0;
118	}
119
120	meson_encoder_dsi->next_bridge = of_drm_find_bridge(remote);
121	if (!meson_encoder_dsi->next_bridge) {
122		dev_dbg(priv->dev, "Failed to find DSI transceiver bridge\n");
123		return -EPROBE_DEFER;
124	}
125
126	/* DSI Encoder Bridge */
127	meson_encoder_dsi->bridge.funcs = &meson_encoder_dsi_bridge_funcs;
128	meson_encoder_dsi->bridge.of_node = priv->dev->of_node;
129	meson_encoder_dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
130
131	drm_bridge_add(&meson_encoder_dsi->bridge);
132
133	meson_encoder_dsi->priv = priv;
134
135	/* Encoder */
136	ret = drm_simple_encoder_init(priv->drm, &meson_encoder_dsi->encoder,
137				      DRM_MODE_ENCODER_DSI);
138	if (ret) {
139		dev_err(priv->dev, "Failed to init DSI encoder: %d\n", ret);
140		return ret;
141	}
142
143	meson_encoder_dsi->encoder.possible_crtcs = BIT(0);
144
145	/* Attach DSI Encoder Bridge to Encoder */
146	ret = drm_bridge_attach(&meson_encoder_dsi->encoder, &meson_encoder_dsi->bridge, NULL, 0);
147	if (ret) {
148		dev_err(priv->dev, "Failed to attach bridge: %d\n", ret);
149		return ret;
150	}
151
152	/*
153	 * We should have now in place:
154	 * encoder->[dsi encoder bridge]->[dw-mipi-dsi bridge]->[panel bridge]->[panel]
155	 */
156
157	priv->encoders[MESON_ENC_DSI] = meson_encoder_dsi;
158
159	dev_dbg(priv->dev, "DSI encoder initialized\n");
160
161	return 0;
162}
163
164void meson_encoder_dsi_remove(struct meson_drm *priv)
165{
166	struct meson_encoder_dsi *meson_encoder_dsi;
167
168	if (priv->encoders[MESON_ENC_DSI]) {
169		meson_encoder_dsi = priv->encoders[MESON_ENC_DSI];
170		drm_bridge_remove(&meson_encoder_dsi->bridge);
171	}
172}