imx-ldb-helper.c

  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * Copyright (C) 2012 Sascha Hauer, Pengutronix
  4 * Copyright 2019,2020,2022 NXP
  5 */
  6
  7#include <linux/export.h>
  8#include <linux/media-bus-format.h>
  9#include <linux/mfd/syscon.h>
 10#include <linux/module.h>
 11#include <linux/of.h>
 12#include <linux/regmap.h>
 13
 14#include <drm/drm_bridge.h>
 15#include <drm/drm_of.h>
 16#include <drm/drm_print.h>
 17
 18#include "imx-ldb-helper.h"
 19
 20bool ldb_channel_is_single_link(struct ldb_channel *ldb_ch)
 21{
 22	return ldb_ch->link_type == LDB_CH_SINGLE_LINK;
 23}
 24EXPORT_SYMBOL_GPL(ldb_channel_is_single_link);
 25
 26bool ldb_channel_is_split_link(struct ldb_channel *ldb_ch)
 27{
 28	return ldb_ch->link_type == LDB_CH_DUAL_LINK_EVEN_ODD_PIXELS ||
 29	       ldb_ch->link_type == LDB_CH_DUAL_LINK_ODD_EVEN_PIXELS;
 30}
 31EXPORT_SYMBOL_GPL(ldb_channel_is_split_link);
 32
 33int ldb_bridge_atomic_check_helper(struct drm_bridge *bridge,
 34				   struct drm_bridge_state *bridge_state,
 35				   struct drm_crtc_state *crtc_state,
 36				   struct drm_connector_state *conn_state)
 37{
 38	struct ldb_channel *ldb_ch = bridge->driver_private;
 39
 40	ldb_ch->in_bus_format = bridge_state->input_bus_cfg.format;
 41	ldb_ch->out_bus_format = bridge_state->output_bus_cfg.format;
 42
 43	return 0;
 44}
 45EXPORT_SYMBOL_GPL(ldb_bridge_atomic_check_helper);
 46
 47void ldb_bridge_mode_set_helper(struct drm_bridge *bridge,
 48				const struct drm_display_mode *mode,
 49				const struct drm_display_mode *adjusted_mode)
 50{
 51	struct ldb_channel *ldb_ch = bridge->driver_private;
 52	struct ldb *ldb = ldb_ch->ldb;
 53	bool is_split = ldb_channel_is_split_link(ldb_ch);
 54
 55	if (is_split)
 56		ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
 57
 58	switch (ldb_ch->out_bus_format) {
 59	case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
 60		break;
 61	case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
 62		if (ldb_ch->chno == 0 || is_split)
 63			ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
 64		if (ldb_ch->chno == 1 || is_split)
 65			ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
 66		break;
 67	case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
 68		if (ldb_ch->chno == 0 || is_split)
 69			ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
 70					 LDB_BIT_MAP_CH0_JEIDA;
 71		if (ldb_ch->chno == 1 || is_split)
 72			ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
 73					 LDB_BIT_MAP_CH1_JEIDA;
 74		break;
 75	}
 76}
 77EXPORT_SYMBOL_GPL(ldb_bridge_mode_set_helper);
 78
 79void ldb_bridge_enable_helper(struct drm_bridge *bridge)
 80{
 81	struct ldb_channel *ldb_ch = bridge->driver_private;
 82	struct ldb *ldb = ldb_ch->ldb;
 83
 84	/*
 85	 * Platform specific bridge drivers should set ldb_ctrl properly
 86	 * for the enablement, so just write the ctrl_reg here.
 87	 */
 88	regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl);
 89}
 90EXPORT_SYMBOL_GPL(ldb_bridge_enable_helper);
 91
 92void ldb_bridge_disable_helper(struct drm_bridge *bridge)
 93{
 94	struct ldb_channel *ldb_ch = bridge->driver_private;
 95	struct ldb *ldb = ldb_ch->ldb;
 96	bool is_split = ldb_channel_is_split_link(ldb_ch);
 97
 98	if (ldb_ch->chno == 0 || is_split)
 99		ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
100	if (ldb_ch->chno == 1 || is_split)
101		ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
102
103	regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl);
104}
105EXPORT_SYMBOL_GPL(ldb_bridge_disable_helper);
106
107int ldb_bridge_attach_helper(struct drm_bridge *bridge, struct drm_encoder *encoder,
108			     enum drm_bridge_attach_flags flags)
109{
110	struct ldb_channel *ldb_ch = bridge->driver_private;
111	struct ldb *ldb = ldb_ch->ldb;
112
113	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
114		DRM_DEV_ERROR(ldb->dev,
115			      "do not support creating a drm_connector\n");
116		return -EINVAL;
117	}
118
119	return drm_bridge_attach(encoder, ldb_ch->next_bridge, bridge,
120				 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
121}
122EXPORT_SYMBOL_GPL(ldb_bridge_attach_helper);
123
124int ldb_init_helper(struct ldb *ldb)
125{
126	struct device *dev = ldb->dev;
127	struct device_node *np = dev->of_node;
128	struct device_node *child;
129	int ret;
130	u32 i;
131
132	ldb->regmap = syscon_node_to_regmap(np->parent);
133	if (IS_ERR(ldb->regmap)) {
134		ret = PTR_ERR(ldb->regmap);
135		if (ret != -EPROBE_DEFER)
136			DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);
137		return ret;
138	}
139
140	for_each_available_child_of_node(np, child) {
141		struct ldb_channel *ldb_ch;
142
143		ret = of_property_read_u32(child, "reg", &i);
144		if (ret || i > MAX_LDB_CHAN_NUM - 1) {
145			ret = -EINVAL;
146			DRM_DEV_ERROR(dev,
147				      "invalid channel node address: %u\n", i);
148			of_node_put(child);
149			return ret;
150		}
151
152		ldb_ch = ldb->channel[i];
153		ldb_ch->ldb = ldb;
154		ldb_ch->chno = i;
155		ldb_ch->is_available = true;
156		ldb_ch->np = child;
157
158		ldb->available_ch_cnt++;
159	}
160
161	return 0;
162}
163EXPORT_SYMBOL_GPL(ldb_init_helper);
164
165int ldb_find_next_bridge_helper(struct ldb *ldb)
166{
167	struct device *dev = ldb->dev;
168	struct ldb_channel *ldb_ch;
169	int ret, i;
170
171	for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
172		ldb_ch = ldb->channel[i];
173
174		if (!ldb_ch->is_available)
175			continue;
176
177		ldb_ch->next_bridge = devm_drm_of_get_bridge(dev, ldb_ch->np,
178							     1, 0);
179		if (IS_ERR(ldb_ch->next_bridge)) {
180			ret = PTR_ERR(ldb_ch->next_bridge);
181			if (ret != -EPROBE_DEFER)
182				DRM_DEV_ERROR(dev,
183					      "failed to get next bridge: %d\n",
184					      ret);
185			return ret;
186		}
187	}
188
189	return 0;
190}
191EXPORT_SYMBOL_GPL(ldb_find_next_bridge_helper);
192
193void ldb_add_bridge_helper(struct ldb *ldb)
194{
195	struct ldb_channel *ldb_ch;
196	int i;
197
198	for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
199		ldb_ch = ldb->channel[i];
200
201		if (!ldb_ch->is_available)
202			continue;
203
204		ldb_ch->bridge.driver_private = ldb_ch;
205		ldb_ch->bridge.of_node = ldb_ch->np;
206
207		drm_bridge_add(&ldb_ch->bridge);
208	}
209}
210EXPORT_SYMBOL_GPL(ldb_add_bridge_helper);
211
212void ldb_remove_bridge_helper(struct ldb *ldb)
213{
214	struct ldb_channel *ldb_ch;
215	int i;
216
217	for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
218		ldb_ch = ldb->channel[i];
219
220		if (!ldb_ch->is_available)
221			continue;
222
223		drm_bridge_remove(&ldb_ch->bridge);
224	}
225}
226EXPORT_SYMBOL_GPL(ldb_remove_bridge_helper);
227
228MODULE_DESCRIPTION("i.MX8 LVDS Display Bridge(LDB)/Pixel Mapper bridge helper");
229MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
230MODULE_LICENSE("GPL");