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drm/bridge: imx: Add LDB driver helper support
This patch adds a helper to support LDB drm bridge drivers for i.MX SoCs. Helper functions supported by this helper should implement common logics for all LDB modules embedded in i.MX SoCs. Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com> # Colibri iMX8X, LT170410-2WHC, LP156WF1 Reviewed-by: Robert Foss <robert.foss@linaro.org> Signed-off-by: Liu Ying <victor.liu@nxp.com> Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Robert Foss <robert.foss@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20220611141421.718743-10-victor.liu@nxp.com
This commit is contained in:
Liu Ying
Robert Foss
parent
96988a526c
commit
1039fb6046
2 changed files with 316 additions and 0 deletions
220
drivers/gpu/drm/bridge/imx/imx-ldb-helper.c
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drivers/gpu/drm/bridge/imx/imx-ldb-helper.c
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2012 Sascha Hauer, Pengutronix
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* Copyright 2019,2020,2022 NXP
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*/
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#include <linux/mfd/syscon.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_of.h>
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#include <drm/drm_print.h>
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#include "imx-ldb-helper.h"
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bool ldb_channel_is_single_link(struct ldb_channel *ldb_ch)
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{
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return ldb_ch->link_type == LDB_CH_SINGLE_LINK;
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}
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bool ldb_channel_is_split_link(struct ldb_channel *ldb_ch)
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{
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return ldb_ch->link_type == LDB_CH_DUAL_LINK_EVEN_ODD_PIXELS ||
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ldb_ch->link_type == LDB_CH_DUAL_LINK_ODD_EVEN_PIXELS;
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}
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int ldb_bridge_atomic_check_helper(struct drm_bridge *bridge,
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struct drm_bridge_state *bridge_state,
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struct drm_crtc_state *crtc_state,
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struct drm_connector_state *conn_state)
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{
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struct ldb_channel *ldb_ch = bridge->driver_private;
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ldb_ch->in_bus_format = bridge_state->input_bus_cfg.format;
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ldb_ch->out_bus_format = bridge_state->output_bus_cfg.format;
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return 0;
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}
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void ldb_bridge_mode_set_helper(struct drm_bridge *bridge,
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const struct drm_display_mode *mode,
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const struct drm_display_mode *adjusted_mode)
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{
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struct ldb_channel *ldb_ch = bridge->driver_private;
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struct ldb *ldb = ldb_ch->ldb;
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bool is_split = ldb_channel_is_split_link(ldb_ch);
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if (is_split)
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ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
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switch (ldb_ch->out_bus_format) {
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case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
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break;
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case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
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if (ldb_ch->chno == 0 || is_split)
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ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
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if (ldb_ch->chno == 1 || is_split)
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ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
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break;
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case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
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if (ldb_ch->chno == 0 || is_split)
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ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
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LDB_BIT_MAP_CH0_JEIDA;
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if (ldb_ch->chno == 1 || is_split)
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ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
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LDB_BIT_MAP_CH1_JEIDA;
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break;
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}
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}
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void ldb_bridge_enable_helper(struct drm_bridge *bridge)
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{
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struct ldb_channel *ldb_ch = bridge->driver_private;
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struct ldb *ldb = ldb_ch->ldb;
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/*
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* Platform specific bridge drivers should set ldb_ctrl properly
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* for the enablement, so just write the ctrl_reg here.
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*/
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regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl);
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}
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void ldb_bridge_disable_helper(struct drm_bridge *bridge)
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{
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struct ldb_channel *ldb_ch = bridge->driver_private;
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struct ldb *ldb = ldb_ch->ldb;
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bool is_split = ldb_channel_is_split_link(ldb_ch);
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if (ldb_ch->chno == 0 || is_split)
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ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
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if (ldb_ch->chno == 1 || is_split)
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ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
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regmap_write(ldb->regmap, ldb->ctrl_reg, ldb->ldb_ctrl);
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}
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int ldb_bridge_attach_helper(struct drm_bridge *bridge,
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enum drm_bridge_attach_flags flags)
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{
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struct ldb_channel *ldb_ch = bridge->driver_private;
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struct ldb *ldb = ldb_ch->ldb;
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if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
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DRM_DEV_ERROR(ldb->dev,
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"do not support creating a drm_connector\n");
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return -EINVAL;
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}
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if (!bridge->encoder) {
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DRM_DEV_ERROR(ldb->dev, "missing encoder\n");
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return -ENODEV;
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}
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return drm_bridge_attach(bridge->encoder,
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ldb_ch->next_bridge, bridge,
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DRM_BRIDGE_ATTACH_NO_CONNECTOR);
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}
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int ldb_init_helper(struct ldb *ldb)
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{
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struct device *dev = ldb->dev;
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struct device_node *np = dev->of_node;
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struct device_node *child;
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int ret;
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u32 i;
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ldb->regmap = syscon_node_to_regmap(np->parent);
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if (IS_ERR(ldb->regmap)) {
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ret = PTR_ERR(ldb->regmap);
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if (ret != -EPROBE_DEFER)
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DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);
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return ret;
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}
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for_each_available_child_of_node(np, child) {
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struct ldb_channel *ldb_ch;
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ret = of_property_read_u32(child, "reg", &i);
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if (ret || i > MAX_LDB_CHAN_NUM - 1) {
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ret = -EINVAL;
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DRM_DEV_ERROR(dev,
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"invalid channel node address: %u\n", i);
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of_node_put(child);
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return ret;
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}
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ldb_ch = ldb->channel[i];
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ldb_ch->ldb = ldb;
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ldb_ch->chno = i;
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ldb_ch->is_available = true;
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ldb_ch->np = child;
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ldb->available_ch_cnt++;
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}
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return 0;
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}
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int ldb_find_next_bridge_helper(struct ldb *ldb)
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{
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struct device *dev = ldb->dev;
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struct ldb_channel *ldb_ch;
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int ret, i;
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for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
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ldb_ch = ldb->channel[i];
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if (!ldb_ch->is_available)
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continue;
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ldb_ch->next_bridge = devm_drm_of_get_bridge(dev, ldb_ch->np,
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1, 0);
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if (IS_ERR(ldb_ch->next_bridge)) {
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ret = PTR_ERR(ldb_ch->next_bridge);
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if (ret != -EPROBE_DEFER)
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DRM_DEV_ERROR(dev,
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"failed to get next bridge: %d\n",
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ret);
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return ret;
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}
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}
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return 0;
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}
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void ldb_add_bridge_helper(struct ldb *ldb,
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const struct drm_bridge_funcs *bridge_funcs)
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{
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struct ldb_channel *ldb_ch;
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int i;
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for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
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ldb_ch = ldb->channel[i];
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if (!ldb_ch->is_available)
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continue;
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ldb_ch->bridge.driver_private = ldb_ch;
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ldb_ch->bridge.funcs = bridge_funcs;
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ldb_ch->bridge.of_node = ldb_ch->np;
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drm_bridge_add(&ldb_ch->bridge);
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}
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}
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void ldb_remove_bridge_helper(struct ldb *ldb)
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{
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struct ldb_channel *ldb_ch;
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int i;
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for (i = 0; i < MAX_LDB_CHAN_NUM; i++) {
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ldb_ch = ldb->channel[i];
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if (!ldb_ch->is_available)
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continue;
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drm_bridge_remove(&ldb_ch->bridge);
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}
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}
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96
drivers/gpu/drm/bridge/imx/imx-ldb-helper.h
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96
drivers/gpu/drm/bridge/imx/imx-ldb-helper.h
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@ -0,0 +1,96 @@
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/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright 2019,2020,2022 NXP
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*/
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#ifndef __IMX_LDB_HELPER__
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#define __IMX_LDB_HELPER__
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#include <drm/drm_atomic.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_device.h>
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#include <drm/drm_encoder.h>
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#include <drm/drm_modeset_helper_vtables.h>
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#define LDB_CH0_MODE_EN_TO_DI0 BIT(0)
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#define LDB_CH0_MODE_EN_TO_DI1 (3 << 0)
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#define LDB_CH0_MODE_EN_MASK (3 << 0)
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#define LDB_CH1_MODE_EN_TO_DI0 BIT(2)
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#define LDB_CH1_MODE_EN_TO_DI1 (3 << 2)
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#define LDB_CH1_MODE_EN_MASK (3 << 2)
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#define LDB_SPLIT_MODE_EN BIT(4)
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#define LDB_DATA_WIDTH_CH0_24 BIT(5)
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#define LDB_BIT_MAP_CH0_JEIDA BIT(6)
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#define LDB_DATA_WIDTH_CH1_24 BIT(7)
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#define LDB_BIT_MAP_CH1_JEIDA BIT(8)
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#define LDB_DI0_VS_POL_ACT_LOW BIT(9)
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#define LDB_DI1_VS_POL_ACT_LOW BIT(10)
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#define MAX_LDB_CHAN_NUM 2
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enum ldb_channel_link_type {
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LDB_CH_SINGLE_LINK,
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LDB_CH_DUAL_LINK_EVEN_ODD_PIXELS,
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LDB_CH_DUAL_LINK_ODD_EVEN_PIXELS,
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};
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struct ldb;
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struct ldb_channel {
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struct ldb *ldb;
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struct drm_bridge bridge;
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struct drm_bridge *next_bridge;
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struct device_node *np;
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u32 chno;
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bool is_available;
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u32 in_bus_format;
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u32 out_bus_format;
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enum ldb_channel_link_type link_type;
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};
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struct ldb {
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struct regmap *regmap;
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struct device *dev;
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struct ldb_channel *channel[MAX_LDB_CHAN_NUM];
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unsigned int ctrl_reg;
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u32 ldb_ctrl;
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unsigned int available_ch_cnt;
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};
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#define bridge_to_ldb_ch(b) container_of(b, struct ldb_channel, bridge)
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bool ldb_channel_is_single_link(struct ldb_channel *ldb_ch);
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bool ldb_channel_is_split_link(struct ldb_channel *ldb_ch);
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int ldb_bridge_atomic_check_helper(struct drm_bridge *bridge,
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struct drm_bridge_state *bridge_state,
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struct drm_crtc_state *crtc_state,
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struct drm_connector_state *conn_state);
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void ldb_bridge_mode_set_helper(struct drm_bridge *bridge,
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const struct drm_display_mode *mode,
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const struct drm_display_mode *adjusted_mode);
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void ldb_bridge_enable_helper(struct drm_bridge *bridge);
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void ldb_bridge_disable_helper(struct drm_bridge *bridge);
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int ldb_bridge_attach_helper(struct drm_bridge *bridge,
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enum drm_bridge_attach_flags flags);
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int ldb_init_helper(struct ldb *ldb);
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int ldb_find_next_bridge_helper(struct ldb *ldb);
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void ldb_add_bridge_helper(struct ldb *ldb,
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const struct drm_bridge_funcs *bridge_funcs);
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void ldb_remove_bridge_helper(struct ldb *ldb);
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#endif /* __IMX_LDB_HELPER__ */
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