meson_encoder_dsi.c

  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				    struct drm_encoder *encoder,
 37				    enum drm_bridge_attach_flags flags)
 38{
 39	struct meson_encoder_dsi *encoder_dsi = bridge_to_meson_encoder_dsi(bridge);
 40
 41	return drm_bridge_attach(encoder, encoder_dsi->next_bridge,
 42				 &encoder_dsi->bridge, flags);
 43}
 44
 45static void meson_encoder_dsi_atomic_enable(struct drm_bridge *bridge,
 46					    struct drm_atomic_state *state)
 47{
 48	struct meson_encoder_dsi *encoder_dsi = bridge_to_meson_encoder_dsi(bridge);
 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_atomic_state *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_probe(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_drm_bridge_alloc(priv->dev,
110						  struct meson_encoder_dsi,
111						  bridge,
112						  &meson_encoder_dsi_bridge_funcs);
113	if (IS_ERR(meson_encoder_dsi))
114		return PTR_ERR(meson_encoder_dsi);
115
116	/* DSI Transceiver Bridge */
117	remote = of_graph_get_remote_node(priv->dev->of_node, 2, 0);
118	if (!remote) {
119		dev_err(priv->dev, "DSI transceiver device is disabled");
120		return 0;
121	}
122
123	meson_encoder_dsi->next_bridge = of_drm_find_bridge(remote);
124	if (!meson_encoder_dsi->next_bridge)
125		return dev_err_probe(priv->dev, -EPROBE_DEFER,
126				     "Failed to find DSI transceiver bridge\n");
127
128	/* DSI Encoder Bridge */
129	meson_encoder_dsi->bridge.of_node = priv->dev->of_node;
130	meson_encoder_dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
131
132	drm_bridge_add(&meson_encoder_dsi->bridge);
133
134	meson_encoder_dsi->priv = priv;
135
136	/* Encoder */
137	ret = drm_simple_encoder_init(priv->drm, &meson_encoder_dsi->encoder,
138				      DRM_MODE_ENCODER_DSI);
139	if (ret)
140		return dev_err_probe(priv->dev, ret,
141				     "Failed to init DSI encoder\n");
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		return dev_err_probe(priv->dev, ret,
149				     "Failed to attach bridge\n");
150
151	/*
152	 * We should have now in place:
153	 * encoder->[dsi encoder bridge]->[dw-mipi-dsi bridge]->[panel bridge]->[panel]
154	 */
155
156	priv->encoders[MESON_ENC_DSI] = meson_encoder_dsi;
157
158	dev_dbg(priv->dev, "DSI encoder initialized\n");
159
160	return 0;
161}
162
163void meson_encoder_dsi_remove(struct meson_drm *priv)
164{
165	struct meson_encoder_dsi *meson_encoder_dsi;
166
167	if (priv->encoders[MESON_ENC_DSI]) {
168		meson_encoder_dsi = priv->encoders[MESON_ENC_DSI];
169		drm_bridge_remove(&meson_encoder_dsi->bridge);
170	}
171}