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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2012 Sascha Hauer, Pengutronix
* Copyright 2019,2020,2022 NXP
*/
#include <linux/export.h>
#include <linux/media-bus-format.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <drm/drm_bridge.h>
#include <drm/drm_of.h>
#include <drm/drm_print.h>
#include "imx-ldb-helper.h"
bool ldb_channel_is_single_link(struct ldb_channel *ldb_ch)
{
return ldb_ch->link_type == LDB_CH_SINGLE_LINK;
}
EXPORT_SYMBOL_GPL(ldb_channel_is_single_link);
bool ldb_channel_is_split_link(struct ldb_channel *ldb_ch)
{
return ldb_ch->link_type == LDB_CH_DUAL_LINK_EVEN_ODD_PIXELS ||
ldb_ch->link_type == LDB_CH_DUAL_LINK_ODD_EVEN_PIXELS;
}
EXPORT_SYMBOL_GPL(ldb_channel_is_split_link);
int ldb_bridge_atomic_check_helper(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state)
{
struct ldb_channel *ldb_ch = bridge->driver_private;
ldb_ch->in_bus_format = bridge_state->input_bus_cfg.format;
ldb_ch->out_bus_format = bridge_state->output_bus_cfg.format;
return 0;
}
EXPORT_SYMBOL_GPL(ldb_bridge_atomic_check_helper);
void ldb_bridge_mode_set_helper(struct drm_bridge *bridge,
const struct drm_display_mode *mode,
const struct drm_display_mode *adjusted_mode)
{
struct ldb_channel *ldb_ch = bridge->driver_private;
struct ldb *ldb = ldb_ch->ldb;
bool is_split = ldb_channel_is_split_link(ldb_ch);
if (is_split)
ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
switch (ldb_ch->out_bus_format) {
case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
break;
case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
if (ldb_ch->chno == 0 || is_split)
ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
if (ldb_ch->chno == 1 || is_split)
ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
break;
case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
if (ldb_ch->chno == 0 || is_split)
ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
LDB_BIT_MAP_CH0_JEIDA;
if (ldb_ch->chno == 1 || is_split)
ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
LDB_BIT_MAP_CH1_JEIDA;
break;
}
}
EXPORT_SYMBOL_GPL(ldb_bridge_mode_set_helper);
void ldb_bridge_enable_helper(struct drm_bridge *bridge)
{
struct ldb_channel *ldb_ch = bridge->driver_private;
struct ldb *ldb = ldb_ch->ldb;
/*
* Platform specific bridge drivers should set ldb_ctrl properly
* for the enablement, so just write the ctrl_reg here.
*/
regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl);
}
EXPORT_SYMBOL_GPL(ldb_bridge_enable_helper);
void ldb_bridge_disable_helper(struct drm_bridge *bridge)
{
struct ldb_channel *ldb_ch = bridge->driver_private;
struct ldb *ldb = ldb_ch->ldb;
bool is_split = ldb_channel_is_split_link(ldb_ch);
if (ldb_ch->chno == 0 || is_split)
ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
if (ldb_ch->chno == 1 || is_split)
ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl);
}
EXPORT_SYMBOL_GPL(ldb_bridge_disable_helper);
int ldb_bridge_attach_helper(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
struct ldb_channel *ldb_ch = bridge->driver_private;
struct ldb *ldb = ldb_ch->ldb;
if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
DRM_DEV_ERROR(ldb->dev,
"do not support creating a drm_connector\n");
return -EINVAL;
}
if (!bridge->encoder) {
DRM_DEV_ERROR(ldb->dev, "missing encoder\n");
return -ENODEV;
}
return drm_bridge_attach(bridge->encoder,
ldb_ch->next_bridge, bridge,
DRM_BRIDGE_ATTACH_NO_CONNECTOR);
}
EXPORT_SYMBOL_GPL(ldb_bridge_attach_helper);
int ldb_init_helper(struct ldb *ldb)
{
struct device *dev = ldb->dev;
struct device_node *np = dev->of_node;
struct device_node *child;
int ret;
u32 i;
ldb->regmap = syscon_node_to_regmap(np->parent);
if (IS_ERR(ldb->regmap)) {
ret = PTR_ERR(ldb->regmap);
if (ret != -EPROBE_DEFER)
DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);
return ret;
}
for_each_available_child_of_node(np, child) {
struct ldb_channel *ldb_ch;
ret = of_property_read_u32(child, "reg", &i);
if (ret || i > MAX_LDB_CHAN_NUM - 1) {
ret = -EINVAL;
DRM_DEV_ERROR(dev,
"invalid channel node address: %u\n", i);
of_node_put(child);
return ret;
}
ldb_ch = ldb->channel[i];
ldb_ch->ldb = ldb;
ldb_ch->chno = i;
ldb_ch->is_available = true;
ldb_ch->np = child;
ldb->available_ch_cnt++;
}
return 0;
}
EXPORT_SYMBOL_GPL(ldb_init_helper);
int ldb_find_next_bridge_helper(struct ldb *ldb)
{
struct device *dev = ldb->dev;
struct ldb_channel *ldb_ch;
int ret, i;
for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
ldb_ch = ldb->channel[i];
if (!ldb_ch->is_available)
continue;
ldb_ch->next_bridge = devm_drm_of_get_bridge(dev, ldb_ch->np,
1, 0);
if (IS_ERR(ldb_ch->next_bridge)) {
ret = PTR_ERR(ldb_ch->next_bridge);
if (ret != -EPROBE_DEFER)
DRM_DEV_ERROR(dev,
"failed to get next bridge: %d\n",
ret);
return ret;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(ldb_find_next_bridge_helper);
void ldb_add_bridge_helper(struct ldb *ldb,
const struct drm_bridge_funcs *bridge_funcs)
{
struct ldb_channel *ldb_ch;
int i;
for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
ldb_ch = ldb->channel[i];
if (!ldb_ch->is_available)
continue;
ldb_ch->bridge.driver_private = ldb_ch;
ldb_ch->bridge.funcs = bridge_funcs;
ldb_ch->bridge.of_node = ldb_ch->np;
drm_bridge_add(&ldb_ch->bridge);
}
}
EXPORT_SYMBOL_GPL(ldb_add_bridge_helper);
void ldb_remove_bridge_helper(struct ldb *ldb)
{
struct ldb_channel *ldb_ch;
int i;
for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
ldb_ch = ldb->channel[i];
if (!ldb_ch->is_available)
continue;
drm_bridge_remove(&ldb_ch->bridge);
}
}
EXPORT_SYMBOL_GPL(ldb_remove_bridge_helper);
MODULE_DESCRIPTION("i.MX8 LVDS Display Bridge(LDB)/Pixel Mapper bridge helper");
MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
MODULE_LICENSE("GPL");
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